117 lines
3.3 KiB
JavaScript
117 lines
3.3 KiB
JavaScript
/**
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* Copyright (c) 2010-2017 Brian Carlson (brian.m.carlson@gmail.com)
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* All rights reserved.
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*
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* This source code is licensed under the MIT license found in the
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* README.md file in the root directory of this source tree.
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*/
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var types = require('pg-types');
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var escape = require('js-string-escape');
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//result object returned from query
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//in the 'end' event and also
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//passed as second argument to provided callback
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var Result = function(rowMode) {
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this.command = null;
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this.rowCount = null;
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this.oid = null;
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this.rows = [];
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this.fields = [];
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this._parsers = [];
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this.RowCtor = null;
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this.rowAsArray = rowMode == "array";
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if(this.rowAsArray) {
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this.parseRow = this._parseRowAsArray;
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}
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};
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var matchRegexp = /([A-Za-z]+) ?(\d+ )?(\d+)?/;
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//adds a command complete message
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Result.prototype.addCommandComplete = function(msg) {
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var match;
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if(msg.text) {
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//pure javascript
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match = matchRegexp.exec(msg.text);
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} else {
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//native bindings
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match = matchRegexp.exec(msg.command);
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}
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if(match) {
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this.command = match[1];
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//match 3 will only be existing on insert commands
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if(match[3]) {
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//msg.value is from native bindings
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this.rowCount = parseInt(match[3] || msg.value, 10);
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this.oid = parseInt(match[2], 10);
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} else {
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this.rowCount = parseInt(match[2], 10);
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}
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}
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};
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Result.prototype._parseRowAsArray = function(rowData) {
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var row = [];
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for(var i = 0, len = rowData.length; i < len; i++) {
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var rawValue = rowData[i];
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if(rawValue !== null) {
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row.push(this._parsers[i](rawValue));
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} else {
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row.push(null);
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}
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}
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return row;
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};
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//rowData is an array of text or binary values
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//this turns the row into a JavaScript object
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Result.prototype.parseRow = function(rowData) {
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return new this.RowCtor(this._parsers, rowData);
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};
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Result.prototype.addRow = function(row) {
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this.rows.push(row);
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};
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var inlineParser = function(fieldName, i) {
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return "\nthis['" +
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// fields containing single quotes will break
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// the evaluated javascript unless they are escaped
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// see https://github.com/brianc/node-postgres/issues/507
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// Addendum: However, we need to make sure to replace all
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// occurences of apostrophes, not just the first one.
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// See https://github.com/brianc/node-postgres/issues/934
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escape(fieldName) +
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"'] = " +
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"rowData[" + i + "] == null ? null : parsers[" + i + "](rowData[" + i + "]);";
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};
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Result.prototype.addFields = function(fieldDescriptions) {
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//clears field definitions
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//multiple query statements in 1 action can result in multiple sets
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//of rowDescriptions...eg: 'select NOW(); select 1::int;'
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//you need to reset the fields
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if(this.fields.length) {
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this.fields = [];
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this._parsers = [];
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}
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var ctorBody = "";
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for(var i = 0; i < fieldDescriptions.length; i++) {
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var desc = fieldDescriptions[i];
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this.fields.push(desc);
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var parser = this._getTypeParser(desc.dataTypeID, desc.format || 'text');
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this._parsers.push(parser);
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//this is some craziness to compile the row result parsing
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//results in ~60% speedup on large query result sets
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ctorBody += inlineParser(desc.name, i);
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}
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if(!this.rowAsArray) {
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this.RowCtor = Function("parsers", "rowData", ctorBody);
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}
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};
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Result.prototype._getTypeParser = types.getTypeParser;
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module.exports = Result;
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