<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>JSDoc: Source: adapters/Pg/Pg.js</title> <script src="scripts/prettify/prettify.js"> </script> <script src="scripts/prettify/lang-css.js"> </script> <!--[if lt IE 9]> <script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script> <![endif]--> <link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css"> <link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css"> </head> <body> <div id="main"> <h1 class="page-title">Source: adapters/Pg/Pg.js</h1> <section> <article> <pre class="prettyprint source linenums"><code>const Adapter = require('../../Adapter'); const Result = require('../../Result'); const Helpers = require('../../Helpers'); const pg = require('pg'); const url = require('url'); class Pg extends Adapter { constructor (config) { let instance = null; let connectionString = Pg.formatConnectionString(config); if (connectionString !== '') { const conn = new pg.Client(connectionString); conn.connect(err => { if (err) { throw new Error(err); } }); instance = Promise.resolve(conn); } super(instance); } /** * Convert the connection object to a connection string * * @param {Object} config - the configuration object * @return {String} - the connection string */ static formatConnectionString (config) { let connectionString = ''; if (Helpers.isObject(config)) { const host = config.host || 'localhost'; const user = config.user || 'postgres'; const password = `:${config.password}` || ''; const port = config.port || 5432; const conn = { protocol: 'postgres', slashes: true, host: `${host}:${port}`, auth: `${user}${password}`, pathname: config.database }; connectionString = url.format(conn); } else if (Helpers.isString(config)) { connectionString = config; } return connectionString; } /** * Transform the adapter's result into a standard format * * @param {*} result - original driver result object * @return {Result} - standard result object */ transformResult (result) { if (result == null) { return new Result(); } const cols = []; result.fields.forEach(field => { cols.push(field.name); }); return new Result(result.rows, cols); } /** * Run the sql query as a prepared statement * * @param {String} sql - The sql with placeholders * @param {Array} params - The values to insert into the query * @return {void|Promise} - Returns a promise if no callback is provided */ execute (sql, params) { // Replace question marks with numbered placeholders, because this adapter is different... let count = 0; sql = sql.replace(/\?/g, () => { count++; return `$${count}`; }); return this.instance.then(conn => { return new Promise((resolve, reject) => { conn.query(sql, params, (err, result) => (err) ? reject(err) : resolve(this.transformResult(result)) ); }); }); } } module.exports = Pg; </code></pre> </article> </section> </div> <nav> <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-drivers_MariaDB.html">drivers/MariaDB</a></li><li><a href="module-drivers_MSSQLDriver.html">drivers/MSSQLDriver</a></li><li><a href="module-drivers_Mysql.html">drivers/Mysql</a></li><li><a href="module-drivers_Pg.html">drivers/Pg</a></li><li><a href="module-drivers_Sqlite.html">drivers/Sqlite</a></li></ul><h3>Classes</h3><ul><li><a href="NodeQuery.html">NodeQuery</a></li><li><a href="QueryBuilder.html">QueryBuilder</a></li><li><a href="Result.html">Result</a></li></ul> </nav> <br class="clear"> <footer> Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.5.5</a> on Mon Feb 12 2018 14:58:25 GMT-0500 (EST) </footer> <script> prettyPrint(); </script> <script src="scripts/linenumber.js"> </script> </body> </html>