'use strict'; // SQLite3 Query Builder & Compiler // ------- module.exports = function(client) { var _ = require('lodash'); var inherits = require('inherits'); var QueryBuilder = require('../../query/builder'); var QueryCompiler = require('../../query/compiler'); // Query Builder // ------- function QueryBuilder_SQLite3() { this.client = client; QueryBuilder.apply(this, arguments); } inherits(QueryBuilder_SQLite3, QueryBuilder); // Query Compiler // ------- function QueryCompiler_SQLite3() { this.formatter = new client.Formatter(); QueryCompiler.apply(this, arguments); } inherits(QueryCompiler_SQLite3, QueryCompiler); // The locks are not applicable in SQLite3 QueryCompiler_SQLite3.prototype.forShare = QueryCompiler_SQLite3.prototype.forUpdate = function() { return ''; }; // 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. QueryCompiler_SQLite3.prototype.insert = function() { var insert = this.single.insert; var sql = 'insert into ' + this.tableName + ' '; if (_.isArray(insert) && (insert.length === 1) && _.isEmpty(insert[0])) { insert = []; } if (_.isEmpty(insert) && !_.isFunction(insert)) { return sql + 'default values'; } var insertData = this._prepInsert(insert); if (_.isString(insertData)) return sql + insertData; sql += '(' + this.formatter.columnize(insertData.columns) + ')'; if (insertData.values.length === 1) { return sql + ' values (' + this.formatter.parameterize(insertData.values[0]) + ')'; } var blocks = []; for (var i = 0, l = insertData.values.length; i < l; i++) { var block = blocks[i] = []; var current = insertData.values[i]; for (var i2 = 0, l2 = insertData.columns.length; i2 < l2; i2++) { block.push(this.formatter.parameter(current[i2]) + ' as ' + 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. QueryCompiler_SQLite3.prototype.truncate = function() { var table = this.tableName; return { sql: 'delete from sqlite_sequence where name = ' + this.tableName, output: function() { return this.query({sql: 'delete from ' + table}); } }; }; // Compiles a `columnInfo` query QueryCompiler_SQLite3.prototype.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; } }; }; QueryCompiler_SQLite3.prototype.limit = function() { if (!this.single.limit && !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((this.single.offset && !this.single.limit) ? -1 : this.single.limit); }; client.QueryBuilder = QueryBuilder_SQLite3; client.QueryCompiler = QueryCompiler_SQLite3; };