178fcf4ce2
- Updated database module so that other modules can use it directly by require() - use path module where-ever needed - Fixed: public directory not viewed in browser when opening the link
104 lines
3.4 KiB
JavaScript
104 lines
3.4 KiB
JavaScript
'use strict';
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var mysql = require('mysql');
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var pool;//container for connected pool;
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function connectToDatabase(user, password, dbname, host = 'localhost') {
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return new Promise((resolve, reject) => {
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pool = mysql.createPool({
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host: host,
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user: user,
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password: password,
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database: dbname,
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//dateStrings : true,
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//timezone: 'UTC'
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});
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getConnection().then(conn => {
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conn.release();
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resolve(pool);
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}).catch(error => reject(error));
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});
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}
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function getConnection() {
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return new Promise((resolve, reject) => {
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if (!pool)
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return reject("Database not connected");
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pool.getConnection((error, conn) => {
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if (error)
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reject(error);
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else
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resolve(conn);
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});
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})
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}
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function SQL_query(sql, values) {
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return new Promise((resolve, reject) => {
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getConnection().then(conn => {
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const fn = (err, res) => {
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conn.release();
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(err ? reject(err) : resolve(res));
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};
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if (values)
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conn.query(sql, values, fn);
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else
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conn.query(sql, fn);
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}).catch(error => reject(error));
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})
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}
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function SQL_transaction(queries) {
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return new Promise((resolve, reject) => {
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getConnection().then(conn => {
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conn.beginTransaction(err => {
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if (err)
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conn.rollback(() => {
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conn.release();
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reject(err);
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});
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else {
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(function queryFn(result) {
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if (!queries.length) {
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conn.commit(err => {
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if (err)
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conn.rollback(() => {
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conn.release();
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reject(err);
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});
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else {
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conn.release();
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resolve(result);
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}
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});
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} else {
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let q_i = queries.shift();
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const callback = function (err, res) {
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if (err)
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conn.rollback(() => {
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conn.release();
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reject(err);
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});
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else {
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result.push(res);
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queryFn(result);
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}
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};
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if (!Array.isArray(q_i))
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q_i = [q_i];
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if (q_i[1])
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conn.query(q_i[0], q_i[1], callback);
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else
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conn.query(q_i[0], callback);
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}
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})([]);
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}
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});
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}).catch(error => reject(error));
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})
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}
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module.exports = {
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connect: connectToDatabase,
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query: SQL_query,
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transaction: SQL_transaction
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}; |