query-interface.js
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'use strict';
var Utils = require('../../utils')
, Promise = require('../../promise');
/**
Returns an object that treats SQLite's inabilities to do certain queries.
@class QueryInterface
@static
*/
module.exports = {
/**
A wrapper that fixes SQLite's inability to remove columns from existing tables.
It will create a backup of the table, drop the table afterwards and create a
new table with the same name but without the obsolete column.
@method removeColumn
@for QueryInterface
@param {String} tableName The name of the table.
@param {String} attributeName The name of the attribute that we want to remove.
@param {Object} options
@param {Boolean|Function} [options.logging] A function that logs the sql queries, or false for explicitly not logging these queries
@param {CustomEventEmitter} emitter The EventEmitter from outside.
@param {Function} queryAndEmit The function from outside that triggers some events to get triggered.
@since 1.6.0
*/
removeColumn: function(tableName, attributeName, options) {
var self = this;
options = options || {};
return this.describeTable(tableName).then(function(fields) {
delete fields[attributeName];
var sql = self.QueryGenerator.removeColumnQuery(tableName, fields)
, subQueries = sql.split(';').filter(function(q) { return q !== ''; });
return Promise.each(subQueries, function(subQuery) {
return self.sequelize.query(subQuery + ';', { raw: true, logging: options.logging });
});
});
},
/**
A wrapper that fixes SQLite's inability to change columns from existing tables.
It will create a backup of the table, drop the table afterwards and create a
new table with the same name but with a modified version of the respective column.
@method changeColumn
@for QueryInterface
@param {String} tableName The name of the table.
@param {Object} attributes An object with the attribute's name as key and it's options as value object.
@param {Object} options
@param {Boolean|Function} [options.logging] A function that logs the sql queries, or false for explicitly not logging these queries
@param {CustomEventEmitter} emitter The EventEmitter from outside.
@param {Function} queryAndEmit The function from outside that triggers some events to get triggered.
@since 1.6.0
*/
changeColumn: function(tableName, attributes, options) {
var attributeName = Utils._.keys(attributes)[0]
, self = this;
options = options || {};
return this.describeTable(tableName).then(function(fields) {
fields[attributeName] = attributes[attributeName];
var sql = self.QueryGenerator.removeColumnQuery(tableName, fields)
, subQueries = sql.split(';').filter(function(q) { return q !== ''; });
return Promise.each(subQueries, function(subQuery) {
return self.sequelize.query(subQuery + ';', { raw: true, logging: options.logging });
});
});
},
/**
A wrapper that fixes SQLite's inability to rename columns from existing tables.
It will create a backup of the table, drop the table afterwards and create a
new table with the same name but with a renamed version of the respective column.
@method renameColumn
@for QueryInterface
@param {String} tableName The name of the table.
@param {String} attrNameBefore The name of the attribute before it was renamed.
@param {String} attrNameAfter The name of the attribute after it was renamed.
@param {Object} options
@param {Boolean|Function} [options.logging] A function that logs the sql queries, or false for explicitly not logging these queries
@param {CustomEventEmitter} emitter The EventEmitter from outside.
@param {Function} queryAndEmit The function from outside that triggers some events to get triggered.
@since 1.6.0
*/
renameColumn: function(tableName, attrNameBefore, attrNameAfter, options) {
var self = this;
options = options || {};
return this.describeTable(tableName).then(function(fields) {
fields[attrNameAfter] = Utils._.clone(fields[attrNameBefore]);
delete fields[attrNameBefore];
var sql = self.QueryGenerator.renameColumnQuery(tableName, attrNameBefore, attrNameAfter, fields)
, subQueries = sql.split(';').filter(function(q) { return q !== ''; });
return Promise.each(subQueries, function(subQuery) {
return self.sequelize.query(subQuery + ';', { raw: true, logging: options.logging });
});
});
}
};