1549 lines
45 KiB
JavaScript
1549 lines
45 KiB
JavaScript
/*!
|
|
* Module dependencies
|
|
*/
|
|
var ModelBuilder = require('./model-builder.js').ModelBuilder;
|
|
var ModelDefinition = require('./model-definition.js');
|
|
var jutil = require('./jutil');
|
|
var utils = require('./utils');
|
|
var ModelBaseClass = require('./model.js');
|
|
var DataAccessObject = require('./dao.js');
|
|
var List = require('./list.js');
|
|
var EventEmitter = require('events').EventEmitter;
|
|
var util = require('util');
|
|
var path = require('path');
|
|
var fs = require('fs');
|
|
var async = require('async');
|
|
|
|
var existsSync = fs.existsSync || path.existsSync;
|
|
|
|
/**
|
|
* Export public API
|
|
*/
|
|
exports.DataSource = DataSource;
|
|
|
|
/*!
|
|
* Helpers
|
|
*/
|
|
var slice = Array.prototype.slice;
|
|
|
|
/**
|
|
* DataSource - connector-specific classes factory.
|
|
*
|
|
* All classes in single dataSource shares same connector type and
|
|
* one database connection
|
|
*
|
|
* @param {String} name - type of dataSource connector (mysql, mongoose, oracle, redis)
|
|
* @param {Object} settings - any database-specific settings which we need to
|
|
* establish connection (of course it depends on specific connector)
|
|
*
|
|
* - host
|
|
* - port
|
|
* - username
|
|
* - password
|
|
* - database
|
|
* - debug {Boolean} = false
|
|
*
|
|
* @example DataSource creation, waiting for connection callback
|
|
* ```
|
|
* var dataSource = new DataSource('mysql', { database: 'myapp_test' });
|
|
* dataSource.define(...);
|
|
* dataSource.on('connected', function () {
|
|
* // work with database
|
|
* });
|
|
* ```
|
|
*/
|
|
function DataSource(name, settings) {
|
|
if (!(this instanceof DataSource)) {
|
|
return new DataSource(name, settings);
|
|
}
|
|
|
|
// Check if the settings object is passed as the first argument
|
|
if (typeof name === 'object' && settings === undefined) {
|
|
settings = name;
|
|
name = undefined;
|
|
}
|
|
|
|
// Check if the first argument is a URL
|
|
if(typeof name === 'string' && name.indexOf('://') !== -1 ) {
|
|
name = utils.parseSettings(name);
|
|
}
|
|
|
|
// Check if the settings is in the form of URL string
|
|
if(typeof settings === 'string' && settings.indexOf('://') !== -1 ) {
|
|
settings = utils.parseSettings(settings);
|
|
}
|
|
|
|
ModelBuilder.call(this, name, settings);
|
|
|
|
// operation metadata
|
|
// Initialize it before calling setup as the connector might register operations
|
|
this._operations = {};
|
|
|
|
this.setup(name, settings);
|
|
|
|
this._setupConnector();
|
|
|
|
// connector
|
|
var connector = this.connector;
|
|
|
|
// DataAccessObject - connector defined or supply the default
|
|
this.DataAccessObject = (connector && connector.DataAccessObject) ? connector.DataAccessObject : this.constructor.DataAccessObject;
|
|
this.DataAccessObject.apply(this, arguments);
|
|
|
|
|
|
// define DataAccessObject methods
|
|
Object.keys(this.DataAccessObject).forEach(function (name) {
|
|
var fn = this.DataAccessObject[name];
|
|
|
|
if(typeof fn === 'function') {
|
|
this.defineOperation(name, {
|
|
accepts: fn.accepts,
|
|
'returns': fn.returns,
|
|
http: fn.http,
|
|
remoteEnabled: fn.shared ? true : false,
|
|
scope: this.DataAccessObject,
|
|
fnName: name
|
|
});
|
|
}
|
|
}.bind(this));
|
|
|
|
// define DataAccessObject.prototype methods
|
|
Object.keys(this.DataAccessObject.prototype).forEach(function (name) {
|
|
var fn = this.DataAccessObject.prototype[name];
|
|
|
|
if(typeof fn === 'function') {
|
|
var returns = fn.returns;
|
|
|
|
this.defineOperation(name, {
|
|
prototype: true,
|
|
accepts: fn.accepts,
|
|
'returns': fn.returns,
|
|
http: fn.http,
|
|
remoteEnabled: fn.shared ? true : false,
|
|
scope: this.DataAccessObject.prototype,
|
|
fnName: name
|
|
});
|
|
}
|
|
}.bind(this));
|
|
}
|
|
|
|
util.inherits(DataSource, ModelBuilder);
|
|
|
|
// allow child classes to supply a data access object
|
|
DataSource.DataAccessObject = DataAccessObject;
|
|
|
|
// Copy over statics
|
|
for (var m in ModelBuilder) {
|
|
if (!DataSource.hasOwnProperty(m) && 'super_' !== m) {
|
|
DataSource[m] = ModelBuilder[m];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set up the connector instance for backward compatibility with JugglingDB schema/adapter
|
|
* @private
|
|
*/
|
|
DataSource.prototype._setupConnector = function () {
|
|
this.connector = this.connector || this.adapter; // The legacy JugglingDB adapter will set up `adapter` property
|
|
this.adapter = this.connector; // Keep the adapter as an alias to connector
|
|
if (this.connector) {
|
|
if (!this.connector.dataSource) {
|
|
// Set up the dataSource if the connector doesn't do so
|
|
this.connector.dataSource = this;
|
|
}
|
|
var dataSource = this;
|
|
this.connector.log = function (query, start) {
|
|
dataSource.log(query, start);
|
|
};
|
|
|
|
this.connector.logger = function (query) {
|
|
var t1 = Date.now();
|
|
var log = this.log;
|
|
return function (q) {
|
|
log(q || query, t1);
|
|
};
|
|
};
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Set up the data source
|
|
* @param {String} name The name
|
|
* @param {Object} settings The settings
|
|
* @returns {*}
|
|
* @private
|
|
*/
|
|
DataSource.prototype.setup = function(name, settings) {
|
|
var dataSource = this;
|
|
var connector;
|
|
|
|
// support single settings object
|
|
if(name && typeof name === 'object' && !settings) {
|
|
settings = name;
|
|
name = undefined;
|
|
}
|
|
|
|
if(typeof settings === 'object') {
|
|
if(settings.initialize) {
|
|
connector = settings;
|
|
} else if(settings.connector) {
|
|
connector = settings.connector;
|
|
} else if(settings.adapter) {
|
|
connector = settings.adapter;
|
|
}
|
|
}
|
|
|
|
// just save everything we get
|
|
this.settings = settings || {};
|
|
|
|
// Check the debug env settings
|
|
var debugEnv = process.env.DEBUG || process.env.NODE_DEBUG || '';
|
|
var debugModules = debugEnv.split(/[\s,]+/);
|
|
if(debugModules.indexOf('loopback') !== -1) {
|
|
this.settings.debug = true;
|
|
}
|
|
|
|
// Disconnected by default
|
|
this.connected = false;
|
|
this.connecting = false;
|
|
|
|
if(typeof connector === 'string') {
|
|
name = connector;
|
|
connector = undefined;
|
|
}
|
|
name = name || (connector && connector.name);
|
|
this.name = name;
|
|
|
|
if (name && !connector) {
|
|
if (typeof name === 'object') {
|
|
// The first argument might be the connector itself
|
|
connector = name;
|
|
this.name = connector.name;
|
|
}
|
|
// The connector has not been resolved
|
|
else if (name.match(/^\//)) {
|
|
// try absolute path
|
|
connector = require(name);
|
|
} else if (existsSync(__dirname + '/connectors/' + name + '.js')) {
|
|
// try built-in connector
|
|
connector = require('./connectors/' + name);
|
|
} else {
|
|
// try foreign connector
|
|
try {
|
|
if(name.indexOf('loopback-connector-') === -1) {
|
|
name = 'loopback-connector-' + name;
|
|
}
|
|
connector = require(name);
|
|
} catch (e) {
|
|
return console.log('\nWARNING: LoopbackData connector "' + name + '" is not installed,\nso your models would not work, to fix run:\n\n npm install ' + name, '\n');
|
|
}
|
|
}
|
|
}
|
|
|
|
if (connector) {
|
|
var postInit = function postInit(err, result) {
|
|
|
|
this._setupConnector();
|
|
// we have an connector now?
|
|
if (!this.connector) {
|
|
throw new Error('Connector is not defined correctly: it should create `connector` member of dataSource');
|
|
}
|
|
this.connected = !err; // Connected now
|
|
if(this.connected) {
|
|
this.emit('connected');
|
|
} else {
|
|
// The connection fails, let's report it and hope it will be recovered in the next call
|
|
console.error('Connection fails: ', err, '\nIt will be retried for the next request.');
|
|
this.connecting = false;
|
|
}
|
|
|
|
}.bind(this);
|
|
|
|
if ('function' === typeof connector.initialize) {
|
|
// Call the async initialize method
|
|
connector.initialize(this, postInit);
|
|
} else if('function' === typeof connector) {
|
|
// Use the connector constructor directly
|
|
this.connector = new connector(this.settings);
|
|
postInit();
|
|
}
|
|
}
|
|
|
|
dataSource.connect = function(cb) {
|
|
var dataSource = this;
|
|
if(dataSource.connected || dataSource.connecting) {
|
|
process.nextTick(function() {
|
|
cb && cb();
|
|
});
|
|
return;
|
|
}
|
|
dataSource.connecting = true;
|
|
if (dataSource.connector.connect) {
|
|
dataSource.connector.connect(function(err, result) {
|
|
if (!err) {
|
|
dataSource.connected = true;
|
|
dataSource.connecting = false;
|
|
dataSource.emit('connected');
|
|
} else {
|
|
dataSource.connected = false;
|
|
dataSource.connecting = false;
|
|
dataSource.emit('error', err);
|
|
}
|
|
cb && cb(err, result);
|
|
});
|
|
} else {
|
|
process.nextTick(function() {
|
|
dataSource.connected = true;
|
|
dataSource.connecting = false;
|
|
dataSource.emit('connected');
|
|
cb && cb();
|
|
});
|
|
}
|
|
};
|
|
};
|
|
|
|
/**
|
|
* Define a model class
|
|
*
|
|
* @param {String} className
|
|
* @param {Object} properties - hash of class properties in format
|
|
* `{property: Type, property2: Type2, ...}`
|
|
* or
|
|
* `{property: {type: Type}, property2: {type: Type2}, ...}`
|
|
* @param {Object} settings - other configuration of class
|
|
* @return newly created class
|
|
*
|
|
* @example simple case
|
|
* ```
|
|
* var User = dataSource.define('User', {
|
|
* email: String,
|
|
* password: String,
|
|
* birthDate: Date,
|
|
* activated: Boolean
|
|
* });
|
|
* ```
|
|
* @example more advanced case
|
|
* ```
|
|
* var User = dataSource.define('User', {
|
|
* email: { type: String, limit: 150, index: true },
|
|
* password: { type: String, limit: 50 },
|
|
* birthDate: Date,
|
|
* registrationDate: {type: Date, default: function () { return new Date }},
|
|
* activated: { type: Boolean, default: false }
|
|
* });
|
|
* ```
|
|
*/
|
|
|
|
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 NewClass = ModelBuilder.prototype.define.call(this, className, properties, settings);
|
|
|
|
// add data access objects
|
|
this.mixin(NewClass);
|
|
|
|
if(this.connector && this.connector.define) {
|
|
// pass control to connector
|
|
this.connector.define({
|
|
model: NewClass,
|
|
properties: NewClass.definition.properties,
|
|
settings: settings
|
|
});
|
|
}
|
|
|
|
return NewClass;
|
|
};
|
|
|
|
|
|
/**
|
|
* Mixin DataAccessObject methods.
|
|
*
|
|
* @param {Function} ModelCtor The model constructor
|
|
*/
|
|
|
|
DataSource.prototype.mixin = function (ModelCtor) {
|
|
var ops = this.operations();
|
|
var DAO = this.DataAccessObject;
|
|
|
|
// mixin DAO
|
|
jutil.mixin(ModelCtor, DAO);
|
|
|
|
// 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];
|
|
}
|
|
});
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Attach an existing model to a data source.
|
|
*
|
|
* @param {Function} ModelCtor The model constructor
|
|
*/
|
|
|
|
DataSource.prototype.attach = function (ModelCtor) {
|
|
if(ModelCtor.dataSource === this) {
|
|
// Already attached to the data source
|
|
return;
|
|
}
|
|
var className = ModelCtor.modelName;
|
|
var properties = ModelCtor.dataSource.definitions[className].properties;
|
|
var settings = ModelCtor.dataSource.definitions[className].settings;
|
|
|
|
// redefine the dataSource
|
|
ModelCtor.dataSource = this;
|
|
// add to def
|
|
var def = new ModelDefinition(this, className, properties, settings);
|
|
def.build();
|
|
this.definitions[className] = def;
|
|
this.models[className] = ModelCtor;
|
|
|
|
this.mixin(ModelCtor);
|
|
|
|
if(this.connector && this.connector.define) {
|
|
// pass control to connector
|
|
this.connector.define({
|
|
model: ModelCtor,
|
|
properties: properties,
|
|
settings: settings
|
|
});
|
|
}
|
|
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Define single property named `prop` on `model`
|
|
*
|
|
* @param {String} model - name of model
|
|
* @param {String} prop - name of propery
|
|
* @param {Object} params - property settings
|
|
*/
|
|
DataSource.prototype.defineProperty = function (model, prop, params) {
|
|
ModelBuilder.prototype.defineProperty.call(this, model, prop, params);
|
|
|
|
var resolvedProp = this.definitions[model].properties[prop];
|
|
if (this.connector.defineProperty) {
|
|
this.connector.defineProperty(model, prop, resolvedProp);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Drop each model table and re-create.
|
|
* This method make sense only for sql connectors.
|
|
*
|
|
* @param {String} or {[String]} Models to be migrated, if not present, apply to all models
|
|
* @param {Function} [cb] The callback function
|
|
*
|
|
* @warning All data will be lost! Use autoupdate if you need your data.
|
|
*/
|
|
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 make sense only for sql connectors.
|
|
*
|
|
* @param {String} or {[String]} Models to be migrated, if not present, apply to all models
|
|
* @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}
|
|
*
|
|
* `options`
|
|
*
|
|
* all: true - Discovering all models, false - Discovering the models owned by the current user
|
|
* views: true - Including views, false - only tables
|
|
* limit: The page size
|
|
* offset: The starting index
|
|
*
|
|
* @param {Object} options The options
|
|
* @param {Function} [cb] The callback function
|
|
*
|
|
*/
|
|
DataSource.prototype.discoverModelDefinitions = function (options, cb) {
|
|
this.freeze();
|
|
if (this.connector.discoverModelDefinitions) {
|
|
this.connector.discoverModelDefinitions(options, cb);
|
|
} else if (cb) {
|
|
cb();
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* The synchronous version of discoverModelDefinitions
|
|
* @param {Object} options The options
|
|
* @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.
|
|
*
|
|
* `property description`
|
|
*
|
|
* owner {String} The database owner or schema
|
|
* tableName {String} The table/view name
|
|
* columnName {String} The column name
|
|
* dataType {String} The data type
|
|
* dataLength {Number} The data length
|
|
* dataPrecision {Number} The numeric data precision
|
|
* dataScale {Number} The numeric data scale
|
|
* nullable {Boolean} If the data can be null
|
|
*
|
|
* `options`
|
|
*
|
|
* owner/schema The database owner/schema
|
|
*
|
|
* @param {String} modelName The table/view name
|
|
* @param {Object} options The options
|
|
* @param {Function} [cb] The callback function
|
|
*
|
|
*/
|
|
DataSource.prototype.discoverModelProperties = function (modelName, options, cb) {
|
|
this.freeze();
|
|
if (this.connector.discoverModelProperties) {
|
|
this.connector.discoverModelProperties(modelName, options, cb);
|
|
} else if (cb) {
|
|
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
|
|
*
|
|
* Each primary key column description has the following columns:
|
|
*
|
|
* owner {String} => table schema (may be null)
|
|
* tableName {String} => table name
|
|
* columnName {String} => column name
|
|
* keySeq {Number} => sequence number within primary key( a value of 1 represents the first column of the primary key, a value of 2 would represent the second column within the primary key).
|
|
* pkName {String} => primary key name (may be null)
|
|
*
|
|
* The owner, default to current user
|
|
*
|
|
* `options`
|
|
*
|
|
* owner/schema The database owner/schema
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @param {Object} options The options
|
|
* @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) {
|
|
cb();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* The synchronous version of discoverPrimaryKeys
|
|
* @param {String} modelName The model name
|
|
* @param {Object} options The options
|
|
* @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
|
|
*
|
|
* `foreign key 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
|
|
*
|
|
* `options`
|
|
*
|
|
* owner/schema The database owner/schema
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @param {Object} options The options
|
|
* @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) {
|
|
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).
|
|
* They are ordered by fkTableOwner, fkTableName, and keySeq.
|
|
*
|
|
* `foreign key 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
|
|
*
|
|
* `options`
|
|
*
|
|
* owner/schema The database owner/schema
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @param {Object} options The options
|
|
* @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) {
|
|
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 associations
|
|
*
|
|
* @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.associations = 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
|
|
*
|
|
* `options`
|
|
*
|
|
* {String} owner/schema - The database owner/schema name
|
|
* {Boolean} associations - If relations (primary key/foreign key) are navigated
|
|
* {Boolean} all - If all owners are included
|
|
* {Boolean} views - If views are included
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @param {Object} [options] The options
|
|
* @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.name || this.connector.name;
|
|
|
|
var tasks = [
|
|
this.discoverModelProperties.bind(this, modelName, options),
|
|
this.discoverPrimaryKeys.bind(this, modelName, options) ];
|
|
|
|
if (options.associations) {
|
|
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) {
|
|
console.log('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) {
|
|
console.log('Adding schema for ' + schemaKey);
|
|
}
|
|
options.visited[schemaKey] = schema;
|
|
}
|
|
|
|
var otherTables = {};
|
|
if (options.associations) {
|
|
// 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) {
|
|
console.log('Foreign keys: ', fks);
|
|
}
|
|
|
|
foreignKeys.forEach(function (fk) {
|
|
var propName = fromDBName(fk.pkTableName, true);
|
|
schema.properties[propName] = {
|
|
type: fromDBName(fk.pkTableName, false),
|
|
association: {
|
|
type: 'belongsTo',
|
|
foreignKey: fromDBName(fk.pkColumnName, 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) {
|
|
console.log('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
|
|
*
|
|
* `options`
|
|
*
|
|
* {String} owner/schema - The database owner/schema name
|
|
* {Boolean} associations - If relations (primary key/foreign key) are navigated
|
|
* {Boolean} all - If all owners are included
|
|
* {Boolean} views - If views are included
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @param {Object} [options] The options
|
|
*/
|
|
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) {
|
|
console.log('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) {
|
|
console.log('Adding schema for ' + schemaKey);
|
|
}
|
|
options.visited[schemaKey] = schema;
|
|
}
|
|
|
|
var otherTables = {};
|
|
if (options.associations) {
|
|
// 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) {
|
|
console.log('Foreign keys: ', fks);
|
|
}
|
|
|
|
foreignKeys.forEach(function (fk) {
|
|
var propName = fromDBName(fk.pkTableName, true);
|
|
schema.properties[propName] = {
|
|
type: fromDBName(fk.pkTableName, false),
|
|
association: {
|
|
type: 'belongsTo',
|
|
foreignKey: fromDBName(fk.pkColumnName, 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) {
|
|
console.log('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 given owner/modelName
|
|
*
|
|
* `options`
|
|
*
|
|
* {String} owner/schema - The database owner/schema name
|
|
* {Boolean} associations - If relations (primary key/foreign key) are navigated
|
|
* {Boolean} all - If all owners are included
|
|
* {Boolean} views - If views are included
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @param {Object} [options] The options
|
|
* @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.buildModels(schemaList);
|
|
cb && cb(err, models);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Discover and build models from the given owner/modelName synchronously
|
|
*
|
|
* `options`
|
|
*
|
|
* {String} owner/schema - The database owner/schema name
|
|
* {Boolean} associations - If relations (primary key/foreign key) are navigated
|
|
* {Boolean} all - If all owners are included
|
|
* {Boolean} views - If views are included
|
|
*
|
|
* @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.buildModels(schemaList);
|
|
return models;
|
|
};
|
|
|
|
/**
|
|
* Check whether migrations needed
|
|
* This method make sense only for sql connectors.
|
|
* @param {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) {
|
|
this.emit('log', sql, t);
|
|
};
|
|
|
|
/**
|
|
* Freeze dataSource. Behavior depends on connector
|
|
*/
|
|
DataSource.prototype.freeze = function freeze() {
|
|
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.definitions[modelName].tableName(this.connector.name);
|
|
};
|
|
|
|
/**
|
|
* Return column name for specified modelName and propertyName
|
|
* @param {String} modelName The model name
|
|
* @param propertyName The property name
|
|
* @returns {String} columnName
|
|
*/
|
|
DataSource.prototype.columnName = function (modelName, propertyName) {
|
|
return this.definitions[modelName].columnName(this.connector.name, propertyName);
|
|
};
|
|
|
|
/**
|
|
* Return column metadata for specified modelName and propertyName
|
|
* @param {String} modelName The model name
|
|
* @param propertyName The property name
|
|
* @returns {Object} column metadata
|
|
*/
|
|
DataSource.prototype.columnMetadata = function (modelName, propertyName) {
|
|
return this.definitions[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.definitions[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.definitions[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.definitions[modelName].idName) {
|
|
console.log(this.definitions[modelName]);
|
|
}
|
|
return this.definitions[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.definitions[modelName].idNames();
|
|
};
|
|
|
|
|
|
/**
|
|
* 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) {
|
|
// quit if key already defined
|
|
if (this.definitions[className].rawProperties[key]) 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 || Number});
|
|
}.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: Number});
|
|
}
|
|
|
|
};
|
|
|
|
/**
|
|
* Close database connection
|
|
* @param {Fucntion} [cb] The callback function
|
|
*/
|
|
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.dataSource.definitions[className];
|
|
var Slave = function SlaveModel() {
|
|
Master.apply(this, [].slice.call(arguments));
|
|
this.dataSource = dataSource;
|
|
};
|
|
|
|
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.models)) {
|
|
|
|
// store class in model pool
|
|
dataSource.models[className] = Slave;
|
|
dataSource.definitions[className] = new ModelDefinition(dataSource, 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.models = {};
|
|
transaction.definitions = {};
|
|
|
|
for (var i in dataSource.models) {
|
|
dataSource.copyModel.call(transaction, dataSource.models[i]);
|
|
}
|
|
|
|
transaction.exec = function(cb) {
|
|
transaction.connector.exec(cb);
|
|
};
|
|
|
|
return transaction;
|
|
};
|
|
|
|
/**
|
|
* Enable a data source operation to be remote.
|
|
* @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 a data source operation to be remote.
|
|
* @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;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get all operations.
|
|
*/
|
|
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
|
|
* @param obj
|
|
* @param args
|
|
* @returns {boolean}
|
|
*/
|
|
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;
|
|
onConnected = function () {
|
|
// Remove the error handler
|
|
self.removeListener('error', onError);
|
|
method.apply(obj, [].slice.call(args));
|
|
};
|
|
onError = function (err) {
|
|
// Remove the connected listener
|
|
self.removeListener('connected', onConnected);
|
|
var params = [].slice.call(args);
|
|
var cb = params.pop();
|
|
if(typeof cb === 'function') {
|
|
cb(err);
|
|
}
|
|
};
|
|
this.once('connected', onConnected);
|
|
this.once('error', onError);
|
|
if (!this.connecting) {
|
|
this.connect();
|
|
}
|
|
return true;
|
|
};
|
|
|
|
|
|
/**
|
|
* 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
|
|
});
|
|
}
|
|
|