71 lines
1.6 KiB
JavaScript
Executable File
71 lines
1.6 KiB
JavaScript
Executable File
'use strict';
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let fs = require('fs'),
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helpers = require('./helpers'),
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QueryBuilder = require('./QueryBuilder');
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/**
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* Class for connection management
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*/
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class NodeQuery {
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/**
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* Constructor
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*
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* @private
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* @constructor
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*/
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constructor() {
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this.instance = null;
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}
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/**
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* Create a query builder object
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*
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* @param {String} driverType - The name of the database type, eg. mysql or pg
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* @param {Object} connObject - A connection object from the database library you are connecting with
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* @param {String} [connLib] - The name of the db connection library you are using, eg. mysql or mysql2. Optional if the same as driverType
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* @return {QueryBuilder} - The Query Builder object
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*/
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init(driverType, connObject, connLib) {
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connLib = connLib || driverType;
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let paths = {
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driver: `${__dirname}/drivers/${helpers.upperCaseFirst(driverType)}`,
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adapter: `${__dirname}/adapters/${connLib}`,
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};
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Object.keys(paths).forEach(type => {
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try {
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fs.statSync(`${paths[type]}.js`);
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} catch (e) {
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throw new Error(
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`Selected ${type} (${helpers.upperCaseFirst(driverType)}) does not exist!`
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);
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}
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});
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let driver = require(paths.driver);
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let $adapter = require(paths.adapter);
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let adapter = new $adapter(connObject);
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this.instance = new QueryBuilder(driver, adapter);
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return this.instance;
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}
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/**
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* Return an existing query builder instance
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*
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* @return {QueryBuilder} - The Query Builder object
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*/
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getQuery() {
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if (this.instance == null) {
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throw new Error('No Query Builder instance to return');
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}
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return this.instance;
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}
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}
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module.exports = new NodeQuery(); |