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waterline-postgresql

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// SQLite3 Query Builder & Compiler var _ = require('lodash') var inherits = require('inherits') var QueryCompiler = require('../../../query/compiler') var assign = require('lodash/object/assign'); function QueryCompiler_SQLite3(client, builder) { QueryCompiler.call(this, client, builder) } inherits(QueryCompiler_SQLite3, QueryCompiler) assign(QueryCompiler_SQLite3.prototype, { // The locks are not applicable in SQLite3 forShare: emptyStr, forUpdate: emptyStr, // SQLite requires us to build the multi-row insert as a listing of select with // unions joining them together. So we'll build out this list of columns and // then join them all together with select unions to complete the queries. insert: function() { var insertValues = this.single.insert || [] var sql = 'insert into ' + this.tableName + ' ' if (Array.isArray(insertValues)) { if (insertValues.length === 0) { return '' } else if (insertValues.length === 1 && insertValues[0] && _.isEmpty(insertValues[0])) { return sql + this._emptyInsertValue } } else if (typeof insertValues === 'object' && _.isEmpty(insertValues)) { return sql + this._emptyInsertValue } var insertData = this._prepInsert(insertValues) if (_.isString(insertData)) { return sql + insertData } if (insertData.columns.length === 0) { return ''; } sql += '(' + this.formatter.columnize(insertData.columns) + ')' if (insertData.values.length === 1) { return sql + ' values (' + this.formatter.parameterize(insertData.values[0]) + ')' } var blocks = [] var i = -1 while (++i < insertData.values.length) { var i2 = -1, block = blocks[i] = [] var current = insertData.values[i] while (++i2 < insertData.columns.length) { block.push(this.formatter.alias( this.formatter.parameter(current[i2]), this.formatter.wrap(insertData.columns[i2]) )) } blocks[i] = block.join(', ') } return sql + ' select ' + blocks.join(' union all select ') }, // Compile a truncate table statement into SQL. truncate: function() { var table = this.tableName return { sql: 'delete from ' + table, output: function() { return this.query({sql: 'delete from sqlite_sequence where name = ' + table}).catch(function() {}) } } }, // Compiles a `columnInfo` query columnInfo: function() { var column = this.single.columnInfo return { sql: 'PRAGMA table_info(' + this.single.table +')', output: function(resp) { var maxLengthRegex = /.*\((\d+)\)/ var out = _.reduce(resp, function (columns, val) { var type = val.type var maxLength = (maxLength = type.match(maxLengthRegex)) && maxLength[1] type = maxLength ? type.split('(')[0] : type columns[val.name] = { type: type.toLowerCase(), maxLength: maxLength, nullable: !val.notnull, defaultValue: val.dflt_value } return columns }, {}) return column && out[column] || out } } }, limit: function() { var noLimit = !this.single.limit && this.single.limit !== 0 if (noLimit && !this.single.offset) return '' // Workaround for offset only, // see http://stackoverflow.com/questions/10491492/sqllite-with-skip-offset-only-not-limit return 'limit ' + this.formatter.parameter(noLimit ? -1 : this.single.limit) } }) function emptyStr() { return '' } module.exports = QueryCompiler_SQLite3