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113 lines
3.6 KiB
JavaScript
113 lines
3.6 KiB
JavaScript
'use strict';
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// SQLite3 Query Builder & Compiler
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// -------
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module.exports = function(client) {
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var _ = require('lodash');
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var inherits = require('inherits');
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var QueryBuilder = require('../../query/builder');
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var QueryCompiler = require('../../query/compiler');
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// Query Builder
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// -------
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function QueryBuilder_SQLite3() {
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this.client = client;
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QueryBuilder.apply(this, arguments);
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}
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inherits(QueryBuilder_SQLite3, QueryBuilder);
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// Query Compiler
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// -------
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function QueryCompiler_SQLite3() {
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this.formatter = new client.Formatter();
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QueryCompiler.apply(this, arguments);
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}
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inherits(QueryCompiler_SQLite3, QueryCompiler);
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// The locks are not applicable in SQLite3
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QueryCompiler_SQLite3.prototype.forShare =
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QueryCompiler_SQLite3.prototype.forUpdate = function() {
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return '';
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};
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// SQLite requires us to build the multi-row insert as a listing of select with
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// unions joining them together. So we'll build out this list of columns and
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// then join them all together with select unions to complete the queries.
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QueryCompiler_SQLite3.prototype.insert = function() {
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var insert = this.single.insert;
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var sql = 'insert into ' + this.tableName + ' ';
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if (_.isArray(insert) && (insert.length === 1) && _.isEmpty(insert[0])) {
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insert = [];
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}
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if (_.isEmpty(insert) && !_.isFunction(insert)) {
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return sql + 'default values';
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}
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var insertData = this._prepInsert(insert);
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if (_.isString(insertData)) return sql + insertData;
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sql += '(' + this.formatter.columnize(insertData.columns) + ')';
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if (insertData.values.length === 1) {
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return sql + ' values (' + this.formatter.parameterize(insertData.values[0]) + ')';
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}
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var blocks = [];
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for (var i = 0, l = insertData.values.length; i < l; i++) {
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var block = blocks[i] = [];
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var current = insertData.values[i];
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for (var i2 = 0, l2 = insertData.columns.length; i2 < l2; i2++) {
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block.push(this.formatter.parameter(current[i2]) + ' as ' + this.formatter.wrap(insertData.columns[i2]));
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}
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blocks[i] = block.join(', ');
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}
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return sql + ' select ' + blocks.join(' union all select ');
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};
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// Compile a truncate table statement into SQL.
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QueryCompiler_SQLite3.prototype.truncate = function() {
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var table = this.tableName;
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return {
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sql: 'delete from sqlite_sequence where name = ' + this.tableName,
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output: function() {
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return this.query({sql: 'delete from ' + table});
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}
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};
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};
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// Compiles a `columnInfo` query
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QueryCompiler_SQLite3.prototype.columnInfo = function() {
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var column = this.single.columnInfo;
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return {
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sql: 'PRAGMA table_info(' + this.single.table +')',
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output: function(resp) {
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var maxLengthRegex = /.*\((\d+)\)/;
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var out = _.reduce(resp, function (columns, val) {
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var type = val.type;
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var maxLength = (maxLength = type.match(maxLengthRegex)) && maxLength[1];
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type = maxLength ? type.split('(')[0] : type;
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columns[val.name] = {
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type: type.toLowerCase(),
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maxLength: maxLength,
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nullable: !val.notnull,
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defaultValue: val.dflt_value
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};
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return columns;
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}, {});
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return column && out[column] || out;
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}
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};
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};
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QueryCompiler_SQLite3.prototype.limit = function() {
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if (!this.single.limit && !this.single.offset) return '';
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// Workaround for offset only, see http://stackoverflow.com/questions/10491492/sqllite-with-skip-offset-only-not-limit
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return 'limit ' + this.formatter.parameter((this.single.offset && !this.single.limit) ? -1 : this.single.limit);
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};
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client.QueryBuilder = QueryBuilder_SQLite3;
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client.QueryCompiler = QueryCompiler_SQLite3;
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};
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