399 lines
13 KiB
JavaScript
399 lines
13 KiB
JavaScript
// Copyright IBM Corp. 2013,2018. All Rights Reserved.
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// Node module: loopback-connector-mysql
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// This file is licensed under the MIT License.
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// License text available at https://opensource.org/licenses/MIT
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'use strict';
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var g = require('strong-globalize')();
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module.exports = mixinDiscovery;
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/*!
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* @param {MySQL} MySQL connector class
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* @param {Object} mysql mysql driver
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*/
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function mixinDiscovery(MySQL, mysql) {
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var async = require('async');
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function paginateSQL(sql, orderBy, options) {
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options = options || {};
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var limitClause = '';
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if (options.offset || options.skip || options.limit) {
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// Offset starts from 0
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var offset = Number(options.offset || options.skip || 0);
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if (isNaN(offset)) {
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offset = 0;
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}
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limitClause = ' LIMIT ' + offset;
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if (options.limit) {
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var limit = Number(options.limit);
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if (isNaN(limit)) {
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limit = 0;
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}
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limitClause = limitClause + ',' + limit;
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}
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}
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if (!orderBy) {
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sql += ' ORDER BY ' + orderBy;
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}
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return sql + limitClause;
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}
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/*!
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* Build sql for listing schemas (databases in MySQL)
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* @params {Object} [options] Options object
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* @returns {String} The SQL statement
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*/
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MySQL.prototype.buildQuerySchemas = function(options) {
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var sql = 'SELECT catalog_name as "catalog",' +
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' schema_name as "schema"' +
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' FROM information_schema.schemata';
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return paginateSQL(sql, 'schema_name', options);
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};
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/*!
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* Build sql for listing tables
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* @param options {all: for all owners, owner: for a given owner}
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* @returns {string} The sql statement
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*/
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MySQL.prototype.buildQueryTables = function(options) {
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var sqlTables = null;
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var schema = options.owner || options.schema;
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if (options.all && !schema) {
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sqlTables = paginateSQL('SELECT \'table\' AS "type",' +
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' table_name AS "name", table_schema AS "owner"' +
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' FROM information_schema.tables',
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'table_schema, table_name', options);
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} else if (schema) {
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sqlTables = paginateSQL('SELECT \'table\' AS "type",' +
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' table_name AS "name", table_schema AS "owner"' +
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' FROM information_schema.tables' +
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' WHERE table_schema=' + mysql.escape(schema),
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'table_schema, table_name', options);
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} else {
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sqlTables = paginateSQL('SELECT \'table\' AS "type",' +
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' table_name AS "name", ' +
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' table_schema AS "owner" FROM information_schema.tables' +
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' WHERE table_schema=SUBSTRING_INDEX(USER(),\'@\',1)',
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'table_name', options);
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}
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return sqlTables;
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};
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/*!
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* Build sql for listing views
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* @param options {all: for all owners, owner: for a given owner}
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* @returns {string} The sql statement
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*/
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MySQL.prototype.buildQueryViews = function(options) {
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var sqlViews = null;
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if (options.views) {
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var schema = options.owner || options.schema;
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if (options.all && !schema) {
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sqlViews = paginateSQL('SELECT \'view\' AS "type",' +
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' table_name AS "name",' +
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' table_schema AS "owner"' +
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' FROM information_schema.views',
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'table_schema, table_name', options);
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} else if (schema) {
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sqlViews = paginateSQL('SELECT \'view\' AS "type",' +
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' table_name AS "name",' +
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' table_schema AS "owner"' +
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' FROM information_schema.views' +
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' WHERE table_schema=' + mysql.escape(schema),
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'table_schema, table_name', options);
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} else {
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sqlViews = paginateSQL('SELECT \'view\' AS "type",' +
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' table_name AS "name",' +
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' table_schema AS "owner"' +
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' FROM information_schema.views',
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'table_name', options);
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}
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}
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return sqlViews;
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};
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/**
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* Discover model definitions
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*
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* @param {Object} options Options for discovery
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* @param {Function} [cb] The callback function
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*/
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/*!
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* Normalize the arguments
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* @param table string, required
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* @param options object, optional
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* @param cb function, optional
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*/
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MySQL.prototype.getArgs = function(table, options, cb) {
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if ('string' !== typeof table || !table) {
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throw new Error(g.f('{{table}} is a required string argument: %s', table));
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}
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options = options || {};
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if (!cb && 'function' === typeof options) {
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cb = options;
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options = {};
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}
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if (typeof options !== 'object') {
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throw new Error(g.f('{{options}} must be an {{object}}: %s', options));
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}
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return {
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schema: options.owner || options.schema,
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table: table,
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options: options,
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cb: cb,
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};
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};
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/*!
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* Build the sql statement to query columns for a given table
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* @param schema
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* @param table
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* @returns {String} The sql statement
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*/
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MySQL.prototype.buildQueryColumns = function(schema, table) {
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var sql = null;
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if (schema) {
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sql = paginateSQL('SELECT table_schema AS "owner",' +
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' table_name AS "tableName",' +
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' column_name AS "columnName",' +
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' data_type AS "dataType",' +
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' character_maximum_length AS "dataLength",' +
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' numeric_precision AS "dataPrecision",' +
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' numeric_scale AS "dataScale",' +
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' column_type AS "columnType",' +
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' is_nullable = \'YES\' AS "nullable",' +
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' CASE WHEN extra LIKE \'%auto_increment%\' THEN 1 ELSE 0 END AS "generated"' +
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' FROM information_schema.columns' +
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' WHERE table_schema=' + mysql.escape(schema) +
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(table ? ' AND table_name=' + mysql.escape(table) : ''),
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'table_name, ordinal_position', {});
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} else {
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sql = paginateSQL('SELECT table_schema AS "owner",' +
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' table_name AS "tableName",' +
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' column_name AS "columnName",' +
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' data_type AS "dataType",' +
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' character_maximum_length AS "dataLength",' +
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' numeric_precision AS "dataPrecision",' +
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' numeric_scale AS "dataScale",' +
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' column_type AS "columnType",' +
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' is_nullable = \'YES\' AS "nullable",' +
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' CASE WHEN extra LIKE \'%auto_increment%\' THEN 1 ELSE 0 END AS "generated"' +
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' FROM information_schema.columns' +
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(table ? ' WHERE table_name=' + mysql.escape(table) : ''),
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'table_name, ordinal_position', {});
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}
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return sql;
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};
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/**
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* Discover model properties from a table
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* @param {String} table The table name
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* @param {Object} options The options for discovery
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* @param {Function} [cb] The callback function
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*
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*/
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/*!
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* Build the sql statement for querying primary keys of a given table
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* @param schema
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* @param table
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* @returns {string}
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*/
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// http://docs.oracle.com/javase/6/docs/api/java/sql/DatabaseMetaData.html
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// #getPrimaryKeys(java.lang.String, java.lang.String, java.lang.String)
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MySQL.prototype.buildQueryPrimaryKeys = function(schema, table) {
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var sql = 'SELECT table_schema AS "owner",' +
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' table_name AS "tableName",' +
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' column_name AS "columnName",' +
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' ordinal_position AS "keySeq",' +
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' constraint_name AS "pkName"' +
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' FROM information_schema.key_column_usage' +
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' WHERE constraint_name=\'PRIMARY\'';
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if (schema) {
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sql += ' AND table_schema=' + mysql.escape(schema);
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}
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if (table) {
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sql += ' AND table_name=' + mysql.escape(table);
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}
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sql += ' ORDER BY' +
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' table_schema, constraint_name, table_name, ordinal_position';
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return sql;
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};
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/**
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* Discover primary keys for a given table
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* @param {String} table The table name
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* @param {Object} options The options for discovery
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* @param {Function} [cb] The callback function
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*/
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/*!
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* Build the sql statement for querying foreign keys of a given table
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* @param schema
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* @param table
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* @returns {string}
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*/
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MySQL.prototype.buildQueryForeignKeys = function(schema, table) {
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var sql =
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'SELECT table_schema AS "fkOwner",' +
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' constraint_name AS "fkName",' +
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' table_name AS "fkTableName",' +
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' column_name AS "fkColumnName",' +
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' ordinal_position AS "keySeq",' +
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' referenced_table_schema AS "pkOwner", \'PRIMARY\' AS "pkName",' +
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' referenced_table_name AS "pkTableName",' +
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' referenced_column_name AS "pkColumnName"' +
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' FROM information_schema.key_column_usage' +
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' WHERE constraint_name!=\'PRIMARY\'' +
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' AND POSITION_IN_UNIQUE_CONSTRAINT IS NOT NULL';
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if (schema) {
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sql += ' AND table_schema=' + mysql.escape(schema);
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}
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if (table) {
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sql += ' AND table_name=' + mysql.escape(table);
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}
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return sql;
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};
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/**
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* Discover foreign keys for a given table
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* @param {String} table The table name
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* @param {Object} options The options for discovery
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* @param {Function} [cb] The callback function
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*/
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/*!
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* Retrieves a description of the foreign key columns that reference the
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* given table's primary key columns (the foreign keys exported by a table).
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* They are ordered by fkTableOwner, fkTableName, and keySeq.
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* @param schema
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* @param table
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* @returns {string}
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*/
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MySQL.prototype.buildQueryExportedForeignKeys = function(schema, table) {
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var sql = 'SELECT a.constraint_name AS "fkName",' +
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' a.table_schema AS "fkOwner",' +
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' a.table_name AS "fkTableName",' +
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' a.column_name AS "fkColumnName",' +
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' a.ordinal_position AS "keySeq",' +
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' NULL AS "pkName",' +
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' a.referenced_table_schema AS "pkOwner",' +
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' a.referenced_table_name AS "pkTableName",' +
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' a.referenced_column_name AS "pkColumnName"' +
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' FROM information_schema.key_column_usage a' +
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' WHERE a.position_in_unique_constraint IS NOT NULL';
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if (schema) {
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sql += ' AND a.referenced_table_schema=' + mysql.escape(schema);
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}
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if (table) {
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sql += ' AND a.referenced_table_name=' + mysql.escape(table);
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}
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sql += ' ORDER BY a.table_schema, a.table_name, a.ordinal_position';
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return sql;
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};
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/**
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* Discover foreign keys that reference to the primary key of this table
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* @param {String} table The table name
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* @param {Object} options The options for discovery
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* @param {Function} [cb] The callback function
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*/
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MySQL.prototype.buildPropertyType = function(columnDefinition, options) {
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var mysqlType = columnDefinition.dataType;
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var columnType = columnDefinition.columnType;
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var dataLength = columnDefinition.dataLength;
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var type = mysqlType.toUpperCase();
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switch (type) {
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case 'CHAR':
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if (!options.treatCHAR1AsString && columnType === 'char(1)') {
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// Treat char(1) as boolean ('Y', 'N', 'T', 'F', '0', '1')
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return 'Boolean';
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}
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case 'VARCHAR':
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case 'TINYTEXT':
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case 'MEDIUMTEXT':
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case 'LONGTEXT':
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case 'TEXT':
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case 'ENUM':
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case 'SET':
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return 'String';
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case 'TINYBLOB':
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case 'MEDIUMBLOB':
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case 'LONGBLOB':
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case 'BLOB':
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case 'BINARY':
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case 'VARBINARY':
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case 'BIT':
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// treat BIT(1) as boolean as it's 1 or 0
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if (!options.treatBIT1AsBit && columnType === 'bit(1)') {
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return 'Boolean';
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}
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return 'Binary';
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case 'TINYINT':
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// treat TINYINT(1) as boolean as it is aliased as BOOL and BOOLEAN in mysql
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if (!options.treatTINYINT1AsTinyInt && columnType === 'tinyint(1)') {
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return 'Boolean';
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}
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case 'SMALLINT':
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case 'INT':
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case 'MEDIUMINT':
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case 'YEAR':
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case 'FLOAT':
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case 'DOUBLE':
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case 'BIGINT':
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case 'INTEGER':
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case 'DECIMAL':
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case 'NUMERIC':
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return 'Number';
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case 'DATE':
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case 'TIMESTAMP':
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case 'DATETIME':
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return 'Date';
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case 'POINT':
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return 'GeoPoint';
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case 'BOOL':
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case 'BOOLEAN':
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return 'Boolean';
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default:
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return 'String';
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}
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};
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MySQL.prototype.getDefaultSchema = function() {
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if (this.dataSource && this.dataSource.settings &&
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this.dataSource.settings.database) {
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return this.dataSource.settings.database;
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}
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return undefined;
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};
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// Recommended MySQL 5.7 Boolean scheme. See
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// http://dev.mysql.com/doc/refman/5.7/en/numeric-type-overview.html
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// Currently default is the inverse of the recommendation for backward compatibility.
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MySQL.prototype.setDefaultOptions = function(options) {
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var defaultOptions = {
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treatCHAR1AsString: false,
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treatBIT1AsBit: true,
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treatTINYINT1AsTinyInt: true,
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};
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for (var opt in defaultOptions) {
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if (defaultOptions.hasOwnProperty(opt) && !options.hasOwnProperty(opt)) {
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options[opt] = defaultOptions[opt];
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}
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}
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};
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MySQL.prototype.setNullableProperty = function(r) {
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r.nullable = r.nullable ? 'Y' : 'N';
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};
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}
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