1971 lines
57 KiB
JavaScript
1971 lines
57 KiB
JavaScript
/*!
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* Module dependencies
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*/
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var ModelBuilder = require('./model-builder.js').ModelBuilder;
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var ModelDefinition = require('./model-definition.js');
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var RelationDefinition = require('./relation-definition.js');
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var jutil = require('./jutil');
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var utils = require('./utils');
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var ModelBaseClass = require('./model.js');
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var DataAccessObject = require('./dao.js');
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var defineScope = require('./scope.js').defineScope;
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var EventEmitter = require('events').EventEmitter;
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var util = require('util');
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var assert = require('assert');
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var async = require('async');
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var traverse = require('traverse');
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if (process.env.DEBUG === 'loopback') {
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// For back-compatibility
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process.env.DEBUG = 'loopback:*';
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}
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var debug = require('debug')('loopback:datasource');
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/*!
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* Export public API
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*/
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exports.DataSource = DataSource;
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/*!
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* Helpers
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*/
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var slice = Array.prototype.slice;
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/**
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* LoopBack models can manipulate data via the DataSource object.
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* Attaching a `DataSource` to a `Model` adds instance methods and static methods to the `Model`;
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* some of the added methods may be remote methods.
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*
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* Define a data source for persisting models.
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* Typically, you create a DataSource by calling createDataSource() on the LoopBack object; for example:
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* ```js
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* var oracle = loopback.createDataSource({
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* connector: 'oracle',
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* host: '111.22.333.44',
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* database: 'MYDB',
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* username: 'username',
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* password: 'password'
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* });
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* ```
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*
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* All classes in single dataSource share same the connector type and
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* one database connection. The `settings` argument is an object that can have the following properties:
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* - host
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* - port
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* - username
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* - password
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* - database
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* - debug (Boolean, default is false)
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*
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* @desc For example, the following creates a DataSource, and waits for a connection callback.
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* ```
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* var dataSource = new DataSource('mysql', { database: 'myapp_test' });
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* dataSource.define(...);
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* dataSource.on('connected', function () {
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* // work with database
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* });
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* ```
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* @class Define new DataSource
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* @param {String} name Type of dataSource connector (mysql, mongoose, oracle, redis)
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* @param {Object} settings Database-specific settings to establish connection (settings depend on specific connector). See above.
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*/
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function DataSource(name, settings, modelBuilder) {
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if (!(this instanceof DataSource)) {
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return new DataSource(name, settings);
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}
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// Check if the settings object is passed as the first argument
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if (typeof name === 'object' && settings === undefined) {
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settings = name;
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name = undefined;
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}
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// Check if the first argument is a URL
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if (typeof name === 'string' && name.indexOf('://') !== -1) {
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name = utils.parseSettings(name);
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}
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// Check if the settings is in the form of URL string
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if (typeof settings === 'string' && settings.indexOf('://') !== -1) {
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settings = utils.parseSettings(settings);
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}
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this.modelBuilder = modelBuilder || new ModelBuilder();
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this.models = this.modelBuilder.models;
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this.definitions = this.modelBuilder.definitions;
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// operation metadata
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// Initialize it before calling setup as the connector might register operations
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this._operations = {};
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this.setup(name, settings);
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this._setupConnector();
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// connector
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var connector = this.connector;
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// DataAccessObject - connector defined or supply the default
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var dao = (connector && connector.DataAccessObject) || this.constructor.DataAccessObject;
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this.DataAccessObject = function () {
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};
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// define DataAccessObject methods
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Object.keys(dao).forEach(function (name) {
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var fn = dao[name];
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this.DataAccessObject[name] = fn;
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if (typeof fn === 'function') {
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this.defineOperation(name, {
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accepts: fn.accepts,
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'returns': fn.returns,
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http: fn.http,
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remoteEnabled: fn.shared ? true : false,
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scope: this.DataAccessObject,
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fnName: name
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});
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}
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}.bind(this));
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// define DataAccessObject.prototype methods
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Object.keys(dao.prototype).forEach(function (name) {
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var fn = dao.prototype[name];
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this.DataAccessObject.prototype[name] = fn;
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if (typeof fn === 'function') {
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this.defineOperation(name, {
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prototype: true,
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accepts: fn.accepts,
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'returns': fn.returns,
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http: fn.http,
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remoteEnabled: fn.shared ? true : false,
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scope: this.DataAccessObject.prototype,
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fnName: name
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});
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}
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}.bind(this));
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}
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util.inherits(DataSource, EventEmitter);
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// allow child classes to supply a data access object
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DataSource.DataAccessObject = DataAccessObject;
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/**
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* Set up the connector instance for backward compatibility with JugglingDB schema/adapter
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* @private
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*/
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DataSource.prototype._setupConnector = function () {
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this.connector = this.connector || this.adapter; // The legacy JugglingDB adapter will set up `adapter` property
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this.adapter = this.connector; // Keep the adapter as an alias to connector
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if (this.connector) {
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if (!this.connector.dataSource) {
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// Set up the dataSource if the connector doesn't do so
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this.connector.dataSource = this;
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}
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var dataSource = this;
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this.connector.log = function (query, start) {
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dataSource.log(query, start);
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};
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this.connector.logger = function (query) {
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var t1 = Date.now();
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var log = this.log;
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return function (q) {
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log(q || query, t1);
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};
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};
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}
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};
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// List possible connector module names
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function connectorModuleNames(name) {
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var names = []; // Check the name as is
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if (!name.match(/^\//)) {
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names.push('./connectors/' + name); // Check built-in connectors
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if (name.indexOf('loopback-connector-') !== 0) {
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names.push('loopback-connector-' + name); // Try loopback-connector-<name>
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}
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}
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// Only try the short name if the connector is not from StrongLoop
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if(['mongodb', 'oracle', 'mysql', 'postgresql', 'mssql', 'rest', 'soap']
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.indexOf(name) === -1) {
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names.push(name);
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}
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return names;
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}
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// testable with DI
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function tryModules(names, loader) {
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var mod;
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loader = loader || require;
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for (var m = 0; m < names.length; m++) {
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try {
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mod = loader(names[m]);
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} catch (e) {
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/* ignore */
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}
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if (mod) {
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break;
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}
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}
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return mod;
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}
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/*!
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* Resolve a connector by name
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* @param name The connector name
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* @returns {*}
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* @private
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*/
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DataSource._resolveConnector = function (name, loader) {
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var names = connectorModuleNames(name);
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var connector = tryModules(names, loader);
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var error = null;
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if (!connector) {
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error = util.format('\nWARNING: LoopBack connector "%s" is not installed ' +
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'as any of the following modules:\n\n %s\n\nTo fix, run:\n\n npm install %s\n',
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name, names.join('\n'), names[names.length -1]);
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}
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return {
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connector: connector,
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error: error
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};
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};
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/**
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* Set up the data source
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* @param {String} name The name
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* @param {Object} settings The settings
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* @returns {*}
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* @private
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*/
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DataSource.prototype.setup = function (name, settings) {
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var dataSource = this;
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var connector;
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// support single settings object
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if (name && typeof name === 'object' && !settings) {
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settings = name;
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name = undefined;
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}
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if (typeof settings === 'object') {
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if (settings.initialize) {
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connector = settings;
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} else if (settings.connector) {
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connector = settings.connector;
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} else if (settings.adapter) {
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connector = settings.adapter;
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}
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}
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// just save everything we get
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this.settings = settings || {};
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this.settings.debug = this.settings.debug || debug.enabled;
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if(this.settings.debug) {
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debug('Settings: %j', this.settings);
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}
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// Disconnected by default
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this.connected = false;
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this.connecting = false;
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if (typeof connector === 'string') {
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name = connector;
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connector = undefined;
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}
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name = name || (connector && connector.name);
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this.name = name;
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if (name && !connector) {
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if (typeof name === 'object') {
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// The first argument might be the connector itself
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connector = name;
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this.name = connector.name;
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} else {
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// The connector has not been resolved
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var result = DataSource._resolveConnector(name);
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connector = result.connector;
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if (!connector) {
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console.error(result.error);
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this.emit('error', new Error(result.error));
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return;
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}
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}
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}
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if (connector) {
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var postInit = function postInit(err, result) {
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this._setupConnector();
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// we have an connector now?
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if (!this.connector) {
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throw new Error('Connector is not defined correctly: it should create `connector` member of dataSource');
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}
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this.connected = !err; // Connected now
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if (this.connected) {
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this.emit('connected');
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} else {
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// The connection fails, let's report it and hope it will be recovered in the next call
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console.error('Connection fails: ', err, '\nIt will be retried for the next request.');
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this.emit('error', err);
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this.connecting = false;
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}
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}.bind(this);
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if ('function' === typeof connector.initialize) {
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// Call the async initialize method
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connector.initialize(this, postInit);
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} else if ('function' === typeof connector) {
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// Use the connector constructor directly
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this.connector = new connector(this.settings);
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postInit();
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}
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}
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dataSource.connect = function (cb) {
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var dataSource = this;
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if (dataSource.connected || dataSource.connecting) {
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process.nextTick(function () {
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cb && cb();
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});
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return;
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}
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dataSource.connecting = true;
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if (dataSource.connector.connect) {
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dataSource.connector.connect(function (err, result) {
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if (!err) {
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dataSource.connected = true;
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dataSource.connecting = false;
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dataSource.emit('connected');
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} else {
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dataSource.connected = false;
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dataSource.connecting = false;
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dataSource.emit('error', err);
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}
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cb && cb(err, result);
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});
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} else {
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process.nextTick(function () {
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dataSource.connected = true;
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dataSource.connecting = false;
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dataSource.emit('connected');
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cb && cb();
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});
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}
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};
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};
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function isModelClass(cls) {
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if (!cls) {
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return false;
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}
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return cls.prototype instanceof ModelBaseClass;
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}
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DataSource.relationTypes = Object.keys(RelationDefinition.RelationTypes);
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function isModelDataSourceAttached(model) {
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return model && (!model.settings.unresolved) && (model.dataSource instanceof DataSource);
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}
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/*!
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* Define scopes for the model class from the scopes object
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* @param modelClass
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* @param scopes
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*/
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DataSource.prototype.defineScopes = function (modelClass, scopes) {
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if(scopes) {
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for(var s in scopes) {
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defineScope(modelClass, modelClass, s, scopes[s], {}, scopes[s].options);
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}
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}
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};
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/*!
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* Define relations for the model class from the relations object
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* @param modelClass
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* @param relations
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*/
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DataSource.prototype.defineRelations = function (modelClass, relations) {
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var self = this;
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// Create a function for the closure in the loop
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var createListener = function (name, relation, targetModel, throughModel) {
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if (!isModelDataSourceAttached(targetModel)) {
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targetModel.once('dataAccessConfigured', function (model) {
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// Check if the through model doesn't exist or resolved
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if (!throughModel || isModelDataSourceAttached(throughModel)) {
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// The target model is resolved
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var params = traverse(relation).clone();
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params.as = name;
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params.model = model;
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if (throughModel) {
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params.through = throughModel;
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}
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modelClass[relation.type].call(modelClass, name, params);
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}
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});
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}
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if (throughModel && !isModelDataSourceAttached(throughModel)) {
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// Set up a listener to the through model
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throughModel.once('dataAccessConfigured', function (model) {
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if (isModelDataSourceAttached(targetModel)) {
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// The target model is resolved
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var params = traverse(relations).clone();
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params.as = name;
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params.model = targetModel;
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params.through = model;
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modelClass[relation.type].call(modelClass, name, params);
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}
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});
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}
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};
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// Set up the relations
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if (relations) {
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Object.keys(relations).forEach(function(rn) {
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var r = relations[rn];
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assert(DataSource.relationTypes.indexOf(r.type) !== -1, "Invalid relation type: " + r.type);
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var targetModel, polymorphicName;
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if (r.polymorphic && r.type !== 'belongsTo' && !r.model) {
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throw new Error('No model specified for polymorphic ' + r.type + ': ' + rn);
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}
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if (r.polymorphic) {
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polymorphicName = typeof r.model === 'string' ? r.model : rn;
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if (typeof r.polymorphic === 'string') {
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polymorphicName = r.polymorphic;
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} else if (typeof r.polymorphic === 'object' && typeof r.polymorphic.as === 'string') {
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polymorphicName = r.polymorphic.as;
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}
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}
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if (r.model) {
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targetModel = isModelClass(r.model) ? r.model : self.getModel(r.model, true);
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}
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var throughModel = null;
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if (r.through) {
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throughModel = isModelClass(r.through) ? r.through : self.getModel(r.through, true);
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}
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if ((targetModel && !isModelDataSourceAttached(targetModel))
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|| (throughModel && !isModelDataSourceAttached(throughModel))) {
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// Create a listener to defer the relation set up
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createListener(rn, r, targetModel, throughModel);
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} else {
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// The target model is resolved
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var params = traverse(r).clone();
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params.as = rn;
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params.model = polymorphicName || targetModel;
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if (throughModel) {
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params.through = throughModel;
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}
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modelClass[r.type].call(modelClass, rn, params);
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}
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});
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}
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};
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/*!
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* Set up the data access functions from the data source
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* @param {Model} modelClass The model class
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* @param {Object} settings The settings object
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*/
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DataSource.prototype.setupDataAccess = function (modelClass, settings) {
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if (this.connector) {
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// Check if the id property should be generated
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var idName = modelClass.definition.idName();
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var idProp = modelClass.definition.rawProperties[idName];
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if(idProp && idProp.generated && this.connector.getDefaultIdType) {
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// Set the default id type from connector's ability
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var idType = this.connector.getDefaultIdType() || String;
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idProp.type = idType;
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modelClass.definition.properties[idName].type = idType;
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}
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if (this.connector.define) {
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// pass control to connector
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this.connector.define({
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model: modelClass,
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properties: modelClass.definition.properties,
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settings: settings
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});
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}
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}
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// add data access objects
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this.mixin(modelClass);
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// define relations from LDL (options.relations)
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var relations = settings.relationships || settings.relations;
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this.defineRelations(modelClass, relations);
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// Emit the dataAccessConfigured event to indicate all the methods for data
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// access have been mixed into the model class
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modelClass.emit('dataAccessConfigured', modelClass);
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// define scopes from LDL (options.relations)
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var scopes = settings.scopes || {};
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this.defineScopes(modelClass, scopes);
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};
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/**
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* Define a model class. Returns newly created model object.
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* The first (String) argument specifying the model name is required.
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* You can provide one or two JSON object arguments, to provide configuration options.
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* See [Model definition reference](http://docs.strongloop.com/display/DOC/Model+definition+reference) for details.
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*
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* Simple example:
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* ```
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* var User = dataSource.createModel('User', {
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* email: String,
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* password: String,
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* birthDate: Date,
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* activated: Boolean
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* });
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* ```
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* More advanced example
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* ```
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* var User = dataSource.createModel('User', {
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* email: { type: String, limit: 150, index: true },
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* password: { type: String, limit: 50 },
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* birthDate: Date,
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* registrationDate: {type: Date, default: function () { return new Date }},
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* activated: { type: Boolean, default: false }
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* });
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* ```
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* You can also define an ACL when you create a new data source with the `DataSource.create()` method. For example:
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*
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* ```js
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* var Customer = ds.createModel('Customer', {
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* name: {
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* type: String,
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* acls: [
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* {principalType: ACL.USER, principalId: 'u001', accessType: ACL.WRITE, permission: ACL.DENY},
|
|
* {principalType: ACL.USER, principalId: 'u001', accessType: ACL.ALL, permission: ACL.ALLOW}
|
|
* ]
|
|
* }
|
|
* }, {
|
|
* acls: [
|
|
* {principalType: ACL.USER, principalId: 'u001', accessType: ACL.ALL, permission: ACL.ALLOW}
|
|
* ]
|
|
* });
|
|
* ```
|
|
*
|
|
* @param {String} className Name of the model to create.
|
|
* @param {Object} properties Hash of model properties in format `{property: Type, property2: Type2, ...}` or `{property: {type: Type}, property2: {type: Type2}, ...}`
|
|
* @options {Object} properties Other configuration options. This corresponds to the options key in the config object.
|
|
*
|
|
*/
|
|
|
|
DataSource.prototype.createModel = DataSource.prototype.define = function defineClass(className, properties, settings) {
|
|
var args = slice.call(arguments);
|
|
|
|
if (!className) {
|
|
throw new Error('Class name required');
|
|
}
|
|
if (args.length === 1) {
|
|
properties = {};
|
|
args.push(properties);
|
|
}
|
|
if (args.length === 2) {
|
|
settings = {};
|
|
args.push(settings);
|
|
}
|
|
|
|
properties = properties || {};
|
|
settings = settings || {};
|
|
|
|
if (this.isRelational()) {
|
|
// Set the strict mode to be true for relational DBs by default
|
|
if (settings.strict === undefined || settings.strict === null) {
|
|
settings.strict = true;
|
|
}
|
|
if (settings.strict === false) {
|
|
settings.strict = 'throw';
|
|
}
|
|
}
|
|
|
|
var modelClass = this.modelBuilder.define(className, properties, settings);
|
|
modelClass.dataSource = this;
|
|
|
|
if (settings.unresolved) {
|
|
return modelClass;
|
|
}
|
|
|
|
this.setupDataAccess(modelClass, settings);
|
|
modelClass.emit('dataSourceAttached', modelClass);
|
|
|
|
return modelClass;
|
|
};
|
|
|
|
/**
|
|
* Mixin DataAccessObject methods.
|
|
*
|
|
* @param {Function} ModelCtor The model constructor
|
|
* @private
|
|
*/
|
|
|
|
DataSource.prototype.mixin = function (ModelCtor) {
|
|
var ops = this.operations();
|
|
var DAO = this.DataAccessObject;
|
|
|
|
// mixin DAO
|
|
jutil.mixin(ModelCtor, DAO, {proxyFunctions: true, override: true});
|
|
|
|
// decorate operations as alias functions
|
|
Object.keys(ops).forEach(function (name) {
|
|
var op = ops[name];
|
|
var scope;
|
|
|
|
if (op.enabled) {
|
|
scope = op.prototype ? ModelCtor.prototype : ModelCtor;
|
|
// var sfn = scope[name] = function () {
|
|
// op.scope[op.fnName].apply(self, arguments);
|
|
// }
|
|
Object.keys(op)
|
|
.filter(function (key) {
|
|
// filter out the following keys
|
|
return ~[
|
|
'scope',
|
|
'fnName',
|
|
'prototype'
|
|
].indexOf(key);
|
|
})
|
|
.forEach(function (key) {
|
|
if (typeof op[key] !== 'undefined') {
|
|
op.scope[op.fnName][key] = op[key];
|
|
}
|
|
});
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* See ModelBuilder.getModel
|
|
*/
|
|
DataSource.prototype.getModel = function (name, forceCreate) {
|
|
return this.modelBuilder.getModel(name, forceCreate);
|
|
};
|
|
|
|
/**
|
|
* See ModelBuilder.getModelDefinition
|
|
*/
|
|
DataSource.prototype.getModelDefinition = function (name) {
|
|
return this.modelBuilder.getModelDefinition(name);
|
|
};
|
|
|
|
/**
|
|
* Get the data source types
|
|
* @returns {String[]} The data source type, such as ['db', 'nosql', 'mongodb'],
|
|
* ['rest'], or ['db', 'rdbms', 'mysql']
|
|
*/
|
|
DataSource.prototype.getTypes = function () {
|
|
var getTypes = this.connector && this.connector.getTypes;
|
|
var types = getTypes && getTypes() || [];
|
|
if (typeof types === 'string') {
|
|
types = types.split(/[\s,\/]+/);
|
|
}
|
|
return types;
|
|
};
|
|
|
|
/**
|
|
* Check the data source supports the specified types.
|
|
* @param {String} types Type name or an array of type names. Can also be array of Strings.
|
|
* @returns {Boolean} true if all types are supported by the data source
|
|
*/
|
|
DataSource.prototype.supportTypes = function (types) {
|
|
var supportedTypes = this.getTypes();
|
|
if (Array.isArray(types)) {
|
|
// Check each of the types
|
|
for (var i = 0; i < types.length; i++) {
|
|
if (supportedTypes.indexOf(types[i]) === -1) {
|
|
// Not supported
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
} else {
|
|
// The types is a string
|
|
return supportedTypes.indexOf(types) !== -1;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Attach an existing model to a data source.
|
|
*
|
|
* @param {Function} modelClass The model constructor
|
|
*/
|
|
|
|
DataSource.prototype.attach = function (modelClass) {
|
|
if (modelClass.dataSource === this) {
|
|
// Already attached to the data source
|
|
return modelClass;
|
|
}
|
|
|
|
if (modelClass.modelBuilder !== this.modelBuilder) {
|
|
this.modelBuilder.definitions[modelClass.modelName] = modelClass.definition;
|
|
this.modelBuilder.models[modelClass.modelName] = modelClass;
|
|
// reset the modelBuilder
|
|
modelClass.modelBuilder = this.modelBuilder;
|
|
}
|
|
|
|
// redefine the dataSource
|
|
modelClass.dataSource = this;
|
|
|
|
this.setupDataAccess(modelClass, modelClass.settings);
|
|
modelClass.emit('dataSourceAttached', modelClass);
|
|
return modelClass;
|
|
|
|
};
|
|
|
|
/**
|
|
* Define single property named `prop` on `model`
|
|
*
|
|
* @param {String} model Name of model
|
|
* @param {String} prop Name of property
|
|
* @param {Object} params Property settings
|
|
*/
|
|
DataSource.prototype.defineProperty = function (model, prop, params) {
|
|
this.modelBuilder.defineProperty(model, prop, params);
|
|
|
|
var resolvedProp = this.getModelDefinition(model).properties[prop];
|
|
if (this.connector && this.connector.defineProperty) {
|
|
this.connector.defineProperty(model, prop, resolvedProp);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Drop each model table and re-create.
|
|
* This method applies only to database connectors. For MongoDB, it drops and creates indexes.
|
|
*
|
|
* **WARNING**: Calling this function deletes all data! Use `autoupdate()` to preserve data.
|
|
*
|
|
* @param {String} model Model to migrate. If not present, apply to all models. Can also be an array of Strings.
|
|
* @param {Function} [callback] Callback function. Optional.
|
|
*
|
|
|
|
*/
|
|
DataSource.prototype.automigrate = function (models, cb) {
|
|
this.freeze();
|
|
if (this.connector.automigrate) {
|
|
this.connector.automigrate(models, cb);
|
|
} else {
|
|
if ((!cb) && ('function' === typeof models)) {
|
|
cb = models;
|
|
models = undefined;
|
|
}
|
|
cb && process.nextTick(cb);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Update existing database tables.
|
|
* This method applies only to database connectors.
|
|
*
|
|
* @param {String} model Model to migrate. If not present, apply to all models. Can also be an array of Strings.
|
|
* @param {Function} [cb] The callback function
|
|
*/
|
|
DataSource.prototype.autoupdate = function (models, cb) {
|
|
this.freeze();
|
|
if (this.connector.autoupdate) {
|
|
this.connector.autoupdate(models, cb);
|
|
} else {
|
|
if ((!cb) && ('function' === typeof models)) {
|
|
cb = models;
|
|
models = undefined;
|
|
}
|
|
cb && process.nextTick(cb);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Discover existing database tables.
|
|
* This method returns an array of model objects, including {type, name, onwer}
|
|
*
|
|
* @param {Object} options The options
|
|
* @param {Function} Callback function. Optional.
|
|
* @options {Object} options Discovery options. See below.
|
|
* @property {Boolean} all If true, discover all models; if false, discover only models owned by the current user.
|
|
* @property {Boolean} views If true, nclude views; if false, only tables.
|
|
* @property {Number} limit Page size
|
|
* @property {Number} offset Starting index
|
|
*
|
|
*/
|
|
DataSource.prototype.discoverModelDefinitions = function (options, cb) {
|
|
this.freeze();
|
|
if (this.connector.discoverModelDefinitions) {
|
|
this.connector.discoverModelDefinitions(options, cb);
|
|
} else if (cb) {
|
|
process.nextTick(cb);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* The synchronous version of discoverModelDefinitions.
|
|
* @options {Object} options The options
|
|
* @property {Boolean} all If true, discover all models; if false, discover only models owned by the current user.
|
|
* @property {Boolean} views If true, nclude views; if false, only tables.
|
|
* @property {Number} limit Page size
|
|
* @property {Number} offset Starting index
|
|
* @returns {*}
|
|
*/
|
|
DataSource.prototype.discoverModelDefinitionsSync = function (options) {
|
|
this.freeze();
|
|
if (this.connector.discoverModelDefinitionsSync) {
|
|
return this.connector.discoverModelDefinitionsSync(options);
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/**
|
|
* Discover properties for a given model.
|
|
*
|
|
* Callback function return value is an object that can have the following properties:
|
|
*
|
|
*| Key | Type | Description |
|
|
*|-----|------|-------------|
|
|
*|owner | String | Database owner or schema|
|
|
*|tableName | String | Table/view name|
|
|
*|columnName | String | Column name|
|
|
*|dataType | String | Data type|
|
|
*|dataLength | Number | Data length|
|
|
*|dataPrecision | Number | Numeric data precision|
|
|
*|dataScale |Number | Numeric data scale|
|
|
*|nullable |Boolean | If true, then the data can be null|
|
|
*
|
|
* @param {String} modelName The table/view name
|
|
* @options {Object} options The options
|
|
* @property {String} owner|schema The database owner or schema
|
|
* @param {Function} cb Callback function. Optional
|
|
*
|
|
*/
|
|
DataSource.prototype.discoverModelProperties = function (modelName, options, cb) {
|
|
this.freeze();
|
|
if (this.connector.discoverModelProperties) {
|
|
this.connector.discoverModelProperties(modelName, options, cb);
|
|
} else if (cb) {
|
|
process.nextTick(cb);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* The synchronous version of discoverModelProperties
|
|
* @param {String} modelName The table/view name
|
|
* @param {Object} options The options
|
|
* @returns {*}
|
|
*/
|
|
DataSource.prototype.discoverModelPropertiesSync = function (modelName, options) {
|
|
this.freeze();
|
|
if (this.connector.discoverModelPropertiesSync) {
|
|
return this.connector.discoverModelPropertiesSync(modelName, options);
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/**
|
|
* Discover primary keys for a given owner/modelName.
|
|
* Callback function return value is an object that can have the following properties:
|
|
*
|
|
*| Key | Type | Description |
|
|
*|-----|------|-------------|
|
|
*| owner |String | Table schema or owner (may be null). Owner defaults to current user.
|
|
*| tableName |String| Table name
|
|
*| columnName |String| Column name
|
|
*| keySeq |Number| Sequence number within primary key (1 indicates the first column in the primary key; 2 indicates the second column in the primary key).
|
|
*| pkName |String| Primary key name (may be null)
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @options {Object} options The options
|
|
* @property {String} owner|schema The database owner or schema
|
|
* @param {Function} [cb] The callback function
|
|
*/
|
|
DataSource.prototype.discoverPrimaryKeys = function (modelName, options, cb) {
|
|
this.freeze();
|
|
if (this.connector.discoverPrimaryKeys) {
|
|
this.connector.discoverPrimaryKeys(modelName, options, cb);
|
|
} else if (cb) {
|
|
process.nextTick(cb);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* The synchronous version of discoverPrimaryKeys
|
|
* @param {String} modelName The model name
|
|
* @options {Object} options The options
|
|
* @property {String} owner|schema The database owner orschema
|
|
* @returns {*}
|
|
*/
|
|
DataSource.prototype.discoverPrimaryKeysSync = function (modelName, options) {
|
|
this.freeze();
|
|
if (this.connector.discoverPrimaryKeysSync) {
|
|
return this.connector.discoverPrimaryKeysSync(modelName, options);
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/**
|
|
* Discover foreign keys for a given owner/modelName
|
|
*
|
|
* Callback function return value is an object that can have the following properties:
|
|
*
|
|
*| Key | Type | Description |
|
|
*|-----|------|-------------|
|
|
*|fkOwner |String | Foreign key table schema (may be null)
|
|
*|fkName |String | Foreign key name (may be null)
|
|
*|fkTableName |String | Foreign key table name
|
|
*|fkColumnName |String | Foreign key column name
|
|
*|keySeq |Number | Sequence number within a foreign key( a value of 1 represents the first column of the foreign key, a value of 2 would represent the second column within the foreign key).
|
|
*|pkOwner |String | Primary key table schema being imported (may be null)
|
|
*|pkName |String | Primary key name (may be null)
|
|
*|pkTableName |String | Primary key table name being imported
|
|
*|pkColumnName |String | Primary key column name being imported
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @options {Object} options The options
|
|
* @property {String} owner|schema The database owner or schema
|
|
* @param {Function} [cb] The callback function
|
|
*
|
|
*/
|
|
DataSource.prototype.discoverForeignKeys = function (modelName, options, cb) {
|
|
this.freeze();
|
|
if (this.connector.discoverForeignKeys) {
|
|
this.connector.discoverForeignKeys(modelName, options, cb);
|
|
} else if (cb) {
|
|
process.nextTick(cb);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* The synchronous version of discoverForeignKeys
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @param {Object} options The options
|
|
* @returns {*}
|
|
*/
|
|
DataSource.prototype.discoverForeignKeysSync = function (modelName, options) {
|
|
this.freeze();
|
|
if (this.connector.discoverForeignKeysSync) {
|
|
return this.connector.discoverForeignKeysSync(modelName, options);
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/**
|
|
* Retrieves a description of the foreign key columns that reference the given table's primary key columns
|
|
* (the foreign keys exported by a table), ordered by fkTableOwner, fkTableName, and keySeq.
|
|
*
|
|
* Callback function return value is an object that can have the following properties:
|
|
*
|
|
*| Key | Type | Description |
|
|
*|-----|------|-------------|
|
|
*|fkOwner |String | Foreign key table schema (may be null)
|
|
*|fkName |String | Foreign key name (may be null)
|
|
*|fkTableName |String | Foreign key table name
|
|
*|fkColumnName |String | Foreign key column name
|
|
*|keySeq |Number | Sequence number within a foreign key( a value of 1 represents the first column of the foreign key, a value of 2 would represent the second column within the foreign key).
|
|
*|pkOwner |String | Primary key table schema being imported (may be null)
|
|
*|pkName |String | Primary key name (may be null)
|
|
*|pkTableName |String | Primary key table name being imported
|
|
*|pkColumnName |String | Primary key column name being imported
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @options {Object} options The options
|
|
* @property {String} owner|schema The database owner or schema
|
|
* @param {Function} [cb] The callback function
|
|
*/
|
|
DataSource.prototype.discoverExportedForeignKeys = function (modelName, options, cb) {
|
|
this.freeze();
|
|
if (this.connector.discoverExportedForeignKeys) {
|
|
this.connector.discoverExportedForeignKeys(modelName, options, cb);
|
|
} else if (cb) {
|
|
process.nextTick(cb);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* The synchronous version of discoverExportedForeignKeys
|
|
* @param {String} modelName The model name
|
|
* @param {Object} options The options
|
|
* @returns {*}
|
|
*/
|
|
DataSource.prototype.discoverExportedForeignKeysSync = function (modelName, options) {
|
|
this.freeze();
|
|
if (this.connector.discoverExportedForeignKeysSync) {
|
|
return this.connector.discoverExportedForeignKeysSync(modelName, options);
|
|
}
|
|
return null;
|
|
};
|
|
|
|
function capitalize(str) {
|
|
if (!str) {
|
|
return str;
|
|
}
|
|
return str.charAt(0).toUpperCase() + ((str.length > 1) ? str.slice(1).toLowerCase() : '');
|
|
}
|
|
|
|
function fromDBName(dbName, camelCase) {
|
|
if (!dbName) {
|
|
return dbName;
|
|
}
|
|
var parts = dbName.split(/-|_/);
|
|
parts[0] = camelCase ? parts[0].toLowerCase() : capitalize(parts[0]);
|
|
|
|
for (var i = 1; i < parts.length; i++) {
|
|
parts[i] = capitalize(parts[i]);
|
|
}
|
|
return parts.join('');
|
|
}
|
|
|
|
/**
|
|
* Discover one schema from the given model without following the relations.
|
|
**Example schema from oracle connector:**
|
|
*
|
|
* ```js
|
|
* {
|
|
* "name": "Product",
|
|
* "options": {
|
|
* "idInjection": false,
|
|
* "oracle": {
|
|
* "schema": "BLACKPOOL",
|
|
* "table": "PRODUCT"
|
|
* }
|
|
* },
|
|
* "properties": {
|
|
* "id": {
|
|
* "type": "String",
|
|
* "required": true,
|
|
* "length": 20,
|
|
* "id": 1,
|
|
* "oracle": {
|
|
* "columnName": "ID",
|
|
* "dataType": "VARCHAR2",
|
|
* "dataLength": 20,
|
|
* "nullable": "N"
|
|
* }
|
|
* },
|
|
* "name": {
|
|
* "type": "String",
|
|
* "required": false,
|
|
* "length": 64,
|
|
* "oracle": {
|
|
* "columnName": "NAME",
|
|
* "dataType": "VARCHAR2",
|
|
* "dataLength": 64,
|
|
* "nullable": "Y"
|
|
* }
|
|
* },
|
|
* ...
|
|
* "fireModes": {
|
|
* "type": "String",
|
|
* "required": false,
|
|
* "length": 64,
|
|
* "oracle": {
|
|
* "columnName": "FIRE_MODES",
|
|
* "dataType": "VARCHAR2",
|
|
* "dataLength": 64,
|
|
* "nullable": "Y"
|
|
* }
|
|
* }
|
|
* }
|
|
* }
|
|
* ```
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @param {Object} [options] The options
|
|
* @param {Function} [cb] The callback function
|
|
*/
|
|
DataSource.prototype.discoverSchema = function (modelName, options, cb) {
|
|
options = options || {};
|
|
|
|
if (!cb && 'function' === typeof options) {
|
|
cb = options;
|
|
options = {};
|
|
}
|
|
options.visited = {};
|
|
options.relations = false;
|
|
|
|
this.discoverSchemas(modelName, options, function (err, schemas) {
|
|
if (err) {
|
|
cb && cb(err, schemas);
|
|
return;
|
|
}
|
|
for (var s in schemas) {
|
|
cb && cb(null, schemas[s]);
|
|
return;
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Discover schema from a given modelName/view.
|
|
*
|
|
* @param {String} modelName The model name.
|
|
* @options {Object} [options] Options; see below.
|
|
* @property {String} owner|schema Database owner or schema name.
|
|
* @property {Boolean} relations True if relations (primary key/foreign key) are navigated; false otherwise.
|
|
* @property {Boolean} all True if all owners are included; false otherwise.
|
|
* @property {Boolean} views True if views are included; false otherwise.
|
|
* @param {Function} [cb] The callback function
|
|
*/
|
|
DataSource.prototype.discoverSchemas = function (modelName, options, cb) {
|
|
options = options || {};
|
|
|
|
if (!cb && 'function' === typeof options) {
|
|
cb = options;
|
|
options = {};
|
|
}
|
|
|
|
var self = this;
|
|
var schemaName = this.connector.name || this.name;
|
|
|
|
var tasks = [
|
|
this.discoverModelProperties.bind(this, modelName, options),
|
|
this.discoverPrimaryKeys.bind(this, modelName, options) ];
|
|
|
|
var followingRelations = options.associations || options.relations;
|
|
if (followingRelations) {
|
|
tasks.push(this.discoverForeignKeys.bind(this, modelName, options));
|
|
}
|
|
|
|
async.parallel(tasks, function (err, results) {
|
|
|
|
if (err) {
|
|
cb && cb(err);
|
|
return;
|
|
}
|
|
|
|
var columns = results[0];
|
|
if (!columns || columns.length === 0) {
|
|
cb && cb();
|
|
return;
|
|
}
|
|
|
|
// Handle primary keys
|
|
var primaryKeys = results[1];
|
|
var pks = {};
|
|
primaryKeys.forEach(function (pk) {
|
|
pks[pk.columnName] = pk.keySeq;
|
|
});
|
|
|
|
if (self.settings.debug) {
|
|
debug('Primary keys: ', pks);
|
|
}
|
|
|
|
var schema = {
|
|
name: fromDBName(modelName, false),
|
|
options: {
|
|
idInjection: false // DO NOT add id property
|
|
},
|
|
properties: {
|
|
}
|
|
};
|
|
|
|
schema.options[schemaName] = {
|
|
schema: columns[0].owner,
|
|
table: modelName
|
|
};
|
|
|
|
columns.forEach(function (item) {
|
|
var i = item;
|
|
|
|
var propName = fromDBName(item.columnName, true);
|
|
schema.properties[propName] = {
|
|
type: item.type,
|
|
required: (item.nullable === 'N'),
|
|
length: item.dataLength,
|
|
precision: item.dataPrecision,
|
|
scale: item.dataScale
|
|
};
|
|
|
|
if (pks[item.columnName]) {
|
|
schema.properties[propName].id = pks[item.columnName];
|
|
}
|
|
schema.properties[propName][schemaName] = {
|
|
columnName: i.columnName,
|
|
dataType: i.dataType,
|
|
dataLength: i.dataLength,
|
|
dataPrecision: item.dataPrecision,
|
|
dataScale: item.dataScale,
|
|
nullable: i.nullable
|
|
};
|
|
});
|
|
|
|
// Add current modelName to the visited tables
|
|
options.visited = options.visited || {};
|
|
var schemaKey = columns[0].owner + '.' + modelName;
|
|
if (!options.visited.hasOwnProperty(schemaKey)) {
|
|
if (self.settings.debug) {
|
|
debug('Adding schema for ' + schemaKey);
|
|
}
|
|
options.visited[schemaKey] = schema;
|
|
}
|
|
|
|
var otherTables = {};
|
|
if (followingRelations) {
|
|
// Handle foreign keys
|
|
var fks = {};
|
|
var foreignKeys = results[2];
|
|
foreignKeys.forEach(function (fk) {
|
|
var fkInfo = {
|
|
keySeq: fk.keySeq,
|
|
owner: fk.pkOwner,
|
|
tableName: fk.pkTableName,
|
|
columnName: fk.pkColumnName
|
|
};
|
|
if (fks[fk.fkName]) {
|
|
fks[fk.fkName].push(fkInfo);
|
|
} else {
|
|
fks[fk.fkName] = [fkInfo];
|
|
}
|
|
});
|
|
|
|
if (self.settings.debug) {
|
|
debug('Foreign keys: ', fks);
|
|
}
|
|
|
|
schema.options.relations = {};
|
|
foreignKeys.forEach(function (fk) {
|
|
var propName = fromDBName(fk.pkTableName, true);
|
|
schema.options.relations[propName] = {
|
|
model: fromDBName(fk.pkTableName, false),
|
|
type: 'belongsTo',
|
|
foreignKey: fromDBName(fk.fkColumnName, true)
|
|
};
|
|
|
|
var key = fk.pkOwner + '.' + fk.pkTableName;
|
|
if (!options.visited.hasOwnProperty(key) && !otherTables.hasOwnProperty(key)) {
|
|
otherTables[key] = {owner: fk.pkOwner, tableName: fk.pkTableName};
|
|
}
|
|
});
|
|
}
|
|
|
|
if (Object.keys(otherTables).length === 0) {
|
|
cb && cb(null, options.visited);
|
|
} else {
|
|
var moreTasks = [];
|
|
for (var t in otherTables) {
|
|
if (self.settings.debug) {
|
|
debug('Discovering related schema for ' + schemaKey);
|
|
}
|
|
var newOptions = {};
|
|
for (var key in options) {
|
|
newOptions[key] = options[key];
|
|
}
|
|
newOptions.owner = otherTables[t].owner;
|
|
|
|
moreTasks.push(DataSource.prototype.discoverSchemas.bind(self, otherTables[t].tableName, newOptions));
|
|
}
|
|
async.parallel(moreTasks, function (err, results) {
|
|
var result = results && results[0];
|
|
cb && cb(err, result);
|
|
});
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Discover schema from a given table/view synchronously
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @options {Object} [options] Options; see below.
|
|
* @property {String} owner|schema Database owner or schema name.
|
|
* @property {Boolean} relations True if relations (primary key/foreign key) are navigated; false otherwise.
|
|
* @property {Boolean} all True if all owners are included; false otherwise.
|
|
* @property {Boolean} views True if views are included; false otherwise.
|
|
*/
|
|
DataSource.prototype.discoverSchemasSync = function (modelName, options) {
|
|
var self = this;
|
|
var schemaName = this.name || this.connector.name;
|
|
|
|
var columns = this.discoverModelPropertiesSync(modelName, options);
|
|
if (!columns || columns.length === 0) {
|
|
return [];
|
|
}
|
|
|
|
// Handle primary keys
|
|
var primaryKeys = this.discoverPrimaryKeysSync(modelName, options);
|
|
var pks = {};
|
|
primaryKeys.forEach(function (pk) {
|
|
pks[pk.columnName] = pk.keySeq;
|
|
});
|
|
|
|
if (self.settings.debug) {
|
|
debug('Primary keys: ', pks);
|
|
}
|
|
|
|
var schema = {
|
|
name: fromDBName(modelName, false),
|
|
options: {
|
|
idInjection: false // DO NOT add id property
|
|
},
|
|
properties: {
|
|
}
|
|
};
|
|
|
|
schema.options[schemaName] = {
|
|
schema: columns.length > 0 && columns[0].owner,
|
|
table: modelName
|
|
};
|
|
|
|
columns.forEach(function (item) {
|
|
var i = item;
|
|
|
|
var propName = fromDBName(item.columnName, true);
|
|
schema.properties[propName] = {
|
|
type: item.type,
|
|
required: (item.nullable === 'N'),
|
|
length: item.dataLength,
|
|
precision: item.dataPrecision,
|
|
scale: item.dataScale
|
|
};
|
|
|
|
if (pks[item.columnName]) {
|
|
schema.properties[propName].id = pks[item.columnName];
|
|
}
|
|
schema.properties[propName][schemaName] = {
|
|
columnName: i.columnName,
|
|
dataType: i.dataType,
|
|
dataLength: i.dataLength,
|
|
dataPrecision: item.dataPrecision,
|
|
dataScale: item.dataScale,
|
|
nullable: i.nullable
|
|
};
|
|
});
|
|
|
|
// Add current modelName to the visited tables
|
|
options.visited = options.visited || {};
|
|
var schemaKey = columns[0].owner + '.' + modelName;
|
|
if (!options.visited.hasOwnProperty(schemaKey)) {
|
|
if (self.settings.debug) {
|
|
debug('Adding schema for ' + schemaKey);
|
|
}
|
|
options.visited[schemaKey] = schema;
|
|
}
|
|
|
|
var otherTables = {};
|
|
var followingRelations = options.associations || options.relations;
|
|
if (followingRelations) {
|
|
// Handle foreign keys
|
|
var fks = {};
|
|
var foreignKeys = this.discoverForeignKeysSync(modelName, options);
|
|
foreignKeys.forEach(function (fk) {
|
|
var fkInfo = {
|
|
keySeq: fk.keySeq,
|
|
owner: fk.pkOwner,
|
|
tableName: fk.pkTableName,
|
|
columnName: fk.pkColumnName
|
|
};
|
|
if (fks[fk.fkName]) {
|
|
fks[fk.fkName].push(fkInfo);
|
|
} else {
|
|
fks[fk.fkName] = [fkInfo];
|
|
}
|
|
});
|
|
|
|
if (self.settings.debug) {
|
|
debug('Foreign keys: ', fks);
|
|
}
|
|
|
|
schema.options.relations = {};
|
|
foreignKeys.forEach(function (fk) {
|
|
var propName = fromDBName(fk.pkTableName, true);
|
|
schema.options.relations[propName] = {
|
|
model: fromDBName(fk.pkTableName, false),
|
|
type: 'belongsTo',
|
|
foreignKey: fromDBName(fk.fkColumnName, true)
|
|
};
|
|
|
|
var key = fk.pkOwner + '.' + fk.pkTableName;
|
|
if (!options.visited.hasOwnProperty(key) && !otherTables.hasOwnProperty(key)) {
|
|
otherTables[key] = {owner: fk.pkOwner, tableName: fk.pkTableName};
|
|
}
|
|
});
|
|
}
|
|
|
|
if (Object.keys(otherTables).length === 0) {
|
|
return options.visited;
|
|
} else {
|
|
var moreTasks = [];
|
|
for (var t in otherTables) {
|
|
if (self.settings.debug) {
|
|
debug('Discovering related schema for ' + schemaKey);
|
|
}
|
|
var newOptions = {};
|
|
for (var key in options) {
|
|
newOptions[key] = options[key];
|
|
}
|
|
newOptions.owner = otherTables[t].owner;
|
|
self.discoverSchemasSync(otherTables[t].tableName, newOptions);
|
|
}
|
|
return options.visited;
|
|
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Discover and build models from the specified owner/modelName.
|
|
*
|
|
* @param {String} modelName The model name.
|
|
* @options {Object} [options] Options; see below.
|
|
* @property {String} owner|schema Database owner or schema name.
|
|
* @property {Boolean} relations True if relations (primary key/foreign key) are navigated; false otherwise.
|
|
* @property {Boolean} all True if all owners are included; false otherwise.
|
|
* @property {Boolean} views True if views are included; false otherwise.
|
|
* @param {Function} [cb] The callback function
|
|
*/
|
|
DataSource.prototype.discoverAndBuildModels = function (modelName, options, cb) {
|
|
var self = this;
|
|
this.discoverSchemas(modelName, options, function (err, schemas) {
|
|
if (err) {
|
|
cb && cb(err, schemas);
|
|
return;
|
|
}
|
|
|
|
var schemaList = [];
|
|
for (var s in schemas) {
|
|
var schema = schemas[s];
|
|
schemaList.push(schema);
|
|
}
|
|
|
|
var models = self.modelBuilder.buildModels(schemaList);
|
|
// Now attach the models to the data source
|
|
for (var m in models) {
|
|
models[m].attachTo(self);
|
|
}
|
|
cb && cb(err, models);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Discover and build models from the given owner/modelName synchronously.
|
|
*
|
|
* @param {String} modelName The model name.
|
|
* @options {Object} [options] Options; see below.
|
|
* @property {String} owner|schema Database owner or schema name.
|
|
* @property {Boolean} relations True if relations (primary key/foreign key) are navigated; false otherwise.
|
|
* @property {Boolean} all True if all owners are included; false otherwise.
|
|
* @property {Boolean} views True if views are included; false otherwise.
|
|
|
|
* @param {String} modelName The model name
|
|
* @param {Object} [options] The options
|
|
*/
|
|
DataSource.prototype.discoverAndBuildModelsSync = function (modelName, options) {
|
|
var schemas = this.discoverSchemasSync(modelName, options);
|
|
|
|
var schemaList = [];
|
|
for (var s in schemas) {
|
|
var schema = schemas[s];
|
|
schemaList.push(schema);
|
|
}
|
|
|
|
var models = this.modelBuilder.buildModels(schemaList);
|
|
return models;
|
|
};
|
|
|
|
/**
|
|
* Check whether migrations needed
|
|
* This method applies only to SQL connectors.
|
|
* @param {String|String[]} [models] A model name or an array of model names. If not present, apply to all models.
|
|
*/
|
|
DataSource.prototype.isActual = function (models, cb) {
|
|
this.freeze();
|
|
if (this.connector.isActual) {
|
|
this.connector.isActual(models, cb);
|
|
} else {
|
|
if ((!cb) && ('function' === typeof models)) {
|
|
cb = models;
|
|
models = undefined;
|
|
}
|
|
if (cb) {
|
|
process.nextTick(function () {
|
|
cb(null, true);
|
|
});
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Log benchmarked message. Do not redefine this method, if you need to grab
|
|
* chema logs, use `dataSource.on('log', ...)` emitter event
|
|
*
|
|
* @private used by connectors
|
|
*/
|
|
DataSource.prototype.log = function (sql, t) {
|
|
debug(sql, t);
|
|
this.emit('log', sql, t);
|
|
};
|
|
|
|
/**
|
|
* Freeze dataSource. Behavior depends on connector
|
|
*/
|
|
DataSource.prototype.freeze = function freeze() {
|
|
if(!this.connector) {
|
|
throw new Error('The connector has not been initialized.');
|
|
}
|
|
if (this.connector.freezeDataSource) {
|
|
this.connector.freezeDataSource();
|
|
}
|
|
if (this.connector.freezeSchema) {
|
|
this.connector.freezeSchema();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Return table name for specified `modelName`
|
|
* @param {String} modelName The model name
|
|
*/
|
|
DataSource.prototype.tableName = function (modelName) {
|
|
return this.getModelDefinition(modelName).tableName(this.connector.name);
|
|
};
|
|
|
|
/**
|
|
* Return column name for specified modelName and propertyName
|
|
* @param {String} modelName The model name
|
|
* @param {String} propertyName The property name
|
|
* @returns {String} columnName The column name.
|
|
*/
|
|
DataSource.prototype.columnName = function (modelName, propertyName) {
|
|
return this.getModelDefinition(modelName).columnName(this.connector.name, propertyName);
|
|
};
|
|
|
|
/**
|
|
* Return column metadata for specified modelName and propertyName
|
|
* @param {String} modelName The model name
|
|
* @param {String} propertyName The property name
|
|
* @returns {Object} column metadata
|
|
*/
|
|
DataSource.prototype.columnMetadata = function (modelName, propertyName) {
|
|
return this.getModelDefinition(modelName).columnMetadata(this.connector.name, propertyName);
|
|
};
|
|
|
|
/**
|
|
* Return column names for specified modelName
|
|
* @param {String} modelName The model name
|
|
* @returns {String[]} column names
|
|
*/
|
|
DataSource.prototype.columnNames = function (modelName) {
|
|
return this.getModelDefinition(modelName).columnNames(this.connector.name);
|
|
};
|
|
|
|
/**
|
|
* Find the ID column name
|
|
* @param {String} modelName The model name
|
|
* @returns {String} columnName for ID
|
|
*/
|
|
DataSource.prototype.idColumnName = function (modelName) {
|
|
return this.getModelDefinition(modelName).idColumnName(this.connector.name);
|
|
};
|
|
|
|
/**
|
|
* Find the ID property name
|
|
* @param {String} modelName The model name
|
|
* @returns {String} property name for ID
|
|
*/
|
|
DataSource.prototype.idName = function (modelName) {
|
|
if (!this.getModelDefinition(modelName).idName) {
|
|
console.error('No id name', this.getModelDefinition(modelName));
|
|
}
|
|
return this.getModelDefinition(modelName).idName();
|
|
};
|
|
|
|
/**
|
|
* Find the ID property names sorted by the index
|
|
* @param {String} modelName The model name
|
|
* @returns {String[]} property names for IDs
|
|
*/
|
|
DataSource.prototype.idNames = function (modelName) {
|
|
return this.getModelDefinition(modelName).idNames();
|
|
};
|
|
|
|
/**
|
|
* Find the id property definition
|
|
* @param {String} modelName The model name
|
|
* @returns {Object} The id property definition
|
|
*/
|
|
DataSource.prototype.idProperty = function (modelName) {
|
|
var def = this.getModelDefinition(modelName);
|
|
var idProps = def && def.ids();
|
|
return idProps && idProps[0] && idProps[0].property;
|
|
};
|
|
|
|
/**
|
|
* Define foreign key to another model
|
|
* @param {String} className The model name that owns the key
|
|
* @param {String} key Name of key field
|
|
* @param {String} foreignClassName The foreign model name
|
|
*/
|
|
DataSource.prototype.defineForeignKey = function defineForeignKey(className, key, foreignClassName) {
|
|
var pkType = null;
|
|
var foreignModel = this.getModelDefinition(foreignClassName);
|
|
var pkName = foreignModel && foreignModel.idName();
|
|
if (pkName) {
|
|
pkType = foreignModel.properties[pkName].type;
|
|
}
|
|
var model = this.getModelDefinition(className);
|
|
if (model.properties[key]) {
|
|
if (pkType) {
|
|
// Reset the type of the foreign key
|
|
model.rawProperties[key].type = model.properties[key].type = pkType;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (this.connector.defineForeignKey) {
|
|
var cb = function (err, keyType) {
|
|
if (err) throw err;
|
|
// Add the foreign key property to the data source _models
|
|
this.defineProperty(className, key, {type: keyType || pkType});
|
|
}.bind(this);
|
|
switch (this.connector.defineForeignKey.length) {
|
|
case 4:
|
|
this.connector.defineForeignKey(className, key, foreignClassName, cb);
|
|
break;
|
|
default:
|
|
case 3:
|
|
this.connector.defineForeignKey(className, key, cb);
|
|
break;
|
|
}
|
|
} else {
|
|
// Add the foreign key property to the data source _models
|
|
this.defineProperty(className, key, {type: pkType});
|
|
}
|
|
|
|
};
|
|
|
|
/**
|
|
* Close database connection
|
|
* @param {Function} [cb] The callback function. Optional.
|
|
*/
|
|
DataSource.prototype.disconnect = function disconnect(cb) {
|
|
var self = this;
|
|
if (this.connected && (typeof this.connector.disconnect === 'function')) {
|
|
this.connector.disconnect(function (err, result) {
|
|
self.connected = false;
|
|
cb && cb(err, result);
|
|
});
|
|
} else {
|
|
process.nextTick(function () {
|
|
cb && cb();
|
|
});
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Copy the model from Master.
|
|
* @param {Function} Master The model constructor
|
|
* @returns {Function} The copy of the model constructor
|
|
*
|
|
* @private
|
|
*/
|
|
DataSource.prototype.copyModel = function copyModel(Master) {
|
|
var dataSource = this;
|
|
var className = Master.modelName;
|
|
var md = Master.modelBuilder.getModelDefinition(className);
|
|
var Slave = function SlaveModel() {
|
|
Master.apply(this, [].slice.call(arguments));
|
|
};
|
|
|
|
util.inherits(Slave, Master);
|
|
|
|
// Delegating static properties
|
|
Slave.__proto__ = Master;
|
|
|
|
hiddenProperty(Slave, 'dataSource', dataSource);
|
|
hiddenProperty(Slave, 'modelName', className);
|
|
hiddenProperty(Slave, 'relations', Master.relations);
|
|
|
|
if (!(className in dataSource.modelBuilder.models)) {
|
|
|
|
// store class in model pool
|
|
dataSource.modelBuilder.models[className] = Slave;
|
|
dataSource.modelBuilder.definitions[className] = new ModelDefinition(dataSource.modelBuilder, md.name, md.properties, md.settings);
|
|
|
|
if ((!dataSource.isTransaction) && dataSource.connector && dataSource.connector.define) {
|
|
dataSource.connector.define({
|
|
model: Slave,
|
|
properties: md.properties,
|
|
settings: md.settings
|
|
});
|
|
}
|
|
|
|
}
|
|
|
|
return Slave;
|
|
};
|
|
|
|
/**
|
|
*
|
|
* @returns {EventEmitter}
|
|
* @private
|
|
*/
|
|
DataSource.prototype.transaction = function () {
|
|
var dataSource = this;
|
|
var transaction = new EventEmitter();
|
|
|
|
for (var p in dataSource) {
|
|
transaction[p] = dataSource[p];
|
|
}
|
|
|
|
transaction.isTransaction = true;
|
|
transaction.origin = dataSource;
|
|
transaction.name = dataSource.name;
|
|
transaction.settings = dataSource.settings;
|
|
transaction.connected = false;
|
|
transaction.connecting = false;
|
|
transaction.connector = dataSource.connector.transaction();
|
|
|
|
// create blank models pool
|
|
transaction.modelBuilder = new ModelBuilder();
|
|
transaction.models = transaction.modelBuilder.models;
|
|
transaction.definitions = transaction.modelBuilder.definitions;
|
|
|
|
for (var i in dataSource.modelBuilder.models) {
|
|
dataSource.copyModel.call(transaction, dataSource.modelBuilder.models[i]);
|
|
}
|
|
|
|
transaction.exec = function (cb) {
|
|
transaction.connector.exec(cb);
|
|
};
|
|
|
|
return transaction;
|
|
};
|
|
|
|
/**
|
|
* Enable remote access to a data source operation. Each [connector](#connector) has its own set of set
|
|
* remotely enabled and disabled operations. To list the operations, call `dataSource.operations()`.
|
|
* @param {String} operation The operation name
|
|
*/
|
|
|
|
DataSource.prototype.enableRemote = function (operation) {
|
|
var op = this.getOperation(operation);
|
|
if (op) {
|
|
op.remoteEnabled = true;
|
|
} else {
|
|
throw new Error(operation + ' is not provided by the attached connector');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Disable remote access to a data source operation. Each [connector](#connector) has its own set of set enabled
|
|
* and disabled operations. To list the operations, call `dataSource.operations()`.
|
|
*
|
|
*```js
|
|
* var oracle = loopback.createDataSource({
|
|
* connector: require('loopback-connector-oracle'),
|
|
* host: '...',
|
|
* ...
|
|
* });
|
|
* oracle.disableRemote('destroyAll');
|
|
* ```
|
|
* **Notes:**
|
|
*
|
|
* - Disabled operations will not be added to attached models.
|
|
* - Disabling the remoting for a method only affects client access (it will still be available from server models).
|
|
* - Data sources must enable / disable operations before attaching or creating models.
|
|
* @param {String} operation The operation name
|
|
*/
|
|
|
|
DataSource.prototype.disableRemote = function (operation) {
|
|
var op = this.getOperation(operation);
|
|
if (op) {
|
|
op.remoteEnabled = false;
|
|
} else {
|
|
throw new Error(operation + ' is not provided by the attached connector');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get an operation's metadata.
|
|
* @param {String} operation The operation name
|
|
*/
|
|
|
|
DataSource.prototype.getOperation = function (operation) {
|
|
var ops = this.operations();
|
|
var opKeys = Object.keys(ops);
|
|
|
|
for (var i = 0; i < opKeys.length; i++) {
|
|
var op = ops[opKeys[i]];
|
|
|
|
if (op.name === operation) {
|
|
return op;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return JSON object describing all operations.
|
|
*
|
|
* Example return value:
|
|
* ```js
|
|
* {
|
|
* find: {
|
|
* remoteEnabled: true,
|
|
* accepts: [...],
|
|
* returns: [...]
|
|
* enabled: true
|
|
* },
|
|
* save: {
|
|
* remoteEnabled: true,
|
|
* prototype: true,
|
|
* accepts: [...],
|
|
* returns: [...],
|
|
* enabled: true
|
|
* },
|
|
* ...
|
|
* }
|
|
* ```
|
|
*/
|
|
DataSource.prototype.operations = function () {
|
|
return this._operations;
|
|
}
|
|
|
|
/**
|
|
* Define an operation to the data source
|
|
* @param {String} name The operation name
|
|
* @param {Object} options The options
|
|
* @param {Function} fn The function
|
|
*/
|
|
DataSource.prototype.defineOperation = function (name, options, fn) {
|
|
options.fn = fn;
|
|
options.name = name;
|
|
this._operations[name] = options;
|
|
};
|
|
|
|
/**
|
|
* Check if the backend is a relational DB
|
|
* @returns {Boolean}
|
|
*/
|
|
DataSource.prototype.isRelational = function () {
|
|
return this.connector && this.connector.relational;
|
|
};
|
|
|
|
/*!
|
|
* Check if the data source is ready.
|
|
* Returns a Boolean value.
|
|
* @param {Object} obj ?
|
|
* @param {Object} args ?
|
|
*/
|
|
DataSource.prototype.ready = function (obj, args) {
|
|
var self = this;
|
|
if (this.connected) {
|
|
// Connected
|
|
return false;
|
|
}
|
|
|
|
var method = args.callee;
|
|
// Set up a callback after the connection is established to continue the method call
|
|
|
|
var onConnected = null, onError = null, timeoutHandle = null;
|
|
onConnected = function () {
|
|
// Remove the error handler
|
|
self.removeListener('error', onError);
|
|
if (timeoutHandle) {
|
|
clearTimeout(timeoutHandle);
|
|
}
|
|
method.apply(obj, [].slice.call(args));
|
|
};
|
|
onError = function (err) {
|
|
// Remove the connected listener
|
|
self.removeListener('connected', onConnected);
|
|
if (timeoutHandle) {
|
|
clearTimeout(timeoutHandle);
|
|
}
|
|
var params = [].slice.call(args);
|
|
var cb = params.pop();
|
|
if (typeof cb === 'function') {
|
|
cb(err);
|
|
}
|
|
};
|
|
this.once('connected', onConnected);
|
|
this.once('error', onError);
|
|
|
|
// Set up a timeout to cancel the invocation
|
|
var timeout = this.settings.connectionTimeout || 5000;
|
|
timeoutHandle = setTimeout(function () {
|
|
self.removeListener('error', onError);
|
|
self.removeListener('connected', onConnected);
|
|
var params = [].slice.call(args);
|
|
var cb = params.pop();
|
|
if (typeof cb === 'function') {
|
|
cb(new Error('Timeout in connecting after ' + timeout + ' ms'));
|
|
}
|
|
}, timeout);
|
|
|
|
if (!this.connecting) {
|
|
this.connect();
|
|
}
|
|
return true;
|
|
};
|
|
|
|
/**
|
|
* Ping the underlying connector to test the connections
|
|
* @param {Function} [cb] Callback function
|
|
*/
|
|
DataSource.prototype.ping = function (cb) {
|
|
var self = this;
|
|
if (self.connector.ping) {
|
|
this.connector.ping(cb);
|
|
} else if (self.connector.discoverModelProperties) {
|
|
self.discoverModelProperties('dummy', {}, cb);
|
|
} else {
|
|
process.nextTick(function () {
|
|
var err = self.connected ? null : 'Not connected';
|
|
cb(err);
|
|
});
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Define a hidden property
|
|
* @param {Object} obj The property owner
|
|
* @param {String} key The property name
|
|
* @param {Mixed} value The default value
|
|
*/
|
|
function hiddenProperty(obj, key, value) {
|
|
Object.defineProperty(obj, key, {
|
|
writable: false,
|
|
enumerable: false,
|
|
configurable: false,
|
|
value: value
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Define readonly property on object
|
|
*
|
|
* @param {Object} obj The property owner
|
|
* @param {String} key The property name
|
|
* @param {Mixed} value The default value
|
|
*/
|
|
function defineReadonlyProp(obj, key, value) {
|
|
Object.defineProperty(obj, key, {
|
|
writable: false,
|
|
enumerable: true,
|
|
configurable: true,
|
|
value: value
|
|
});
|
|
}
|
|
|
|
// Carry over a few properties/methods from the ModelBuilder as some tests use them
|
|
DataSource.Text = ModelBuilder.Text;
|
|
DataSource.JSON = ModelBuilder.JSON;
|
|
DataSource.Any = ModelBuilder.Any;
|
|
|
|
/*!
|
|
* @deprecated Use ModelBuilder.registerType instead
|
|
* @param type
|
|
*/
|
|
DataSource.registerType = function (type) {
|
|
ModelBuilder.registerType(type);
|
|
};
|
|
|