Created
October 8, 2019 15:16
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removal of RowDataPacket from the results of mysql query in node js
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| 'use strict'; | |
| var pool = require('./connection'); | |
| const mysql = require('mysql'); | |
| /** | |
| * Executes SQL query and returns data. | |
| * @constructor | |
| * @param {string} queryText - SQL query string. | |
| */ | |
| const querySQL = function (queryText) { | |
| return new Promise(function (resolve, reject) { | |
| pool.query(queryText, function (err, results, fields) { | |
| // Error | |
| if (err) return reject(err); | |
| if (Array.isArray(results)) { | |
| // removal by for loop | |
| let finalResults = []; | |
| const resultsLength = results.length; | |
| for (let index = 0; index < resultsLength; index++) { | |
| finalResults.push({...results[index]}); | |
| } | |
| return resolve(finalResults); | |
| } else { | |
| return resolve(results); | |
| } | |
| }); | |
| }); | |
| }; |
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Learn more about bidirectional Unicode characters
| 'use strict'; | |
| var pool = require('./connection'); | |
| const mysql = require('mysql'); | |
| /** | |
| * Executes SQL query and returns data. | |
| * @constructor | |
| * @param {string} queryText - SQL query string. | |
| */ | |
| const querySQL = function (queryText) { | |
| return new Promise(function (resolve, reject) { | |
| pool.query(queryText, function (err, results, fields) { | |
| // Error | |
| if (err) return reject(err); | |
| if (Array.isArray(results)) { | |
| // removal by JSON stringifing and parsing stingified data | |
| const startJSON = process.hrtime(); | |
| const JSONResults = JSON.parse(JSON.stringify(results)); | |
| const endJSON = process.hrtime(startJSON); | |
| // console.log(JSONResults); | |
| console.log("\n%d nanoseconds json", endJSON[1]); | |
| // removal by Map function | |
| const startMAP = process.hrtime(); | |
| const objectifyRawPacket = row => ({ ...row }); | |
| // iterate over all items and convert the raw packet row -> js object | |
| const MapResults = results.map(objectifyRawPacket); | |
| const endMAP = process.hrtime(startMAP); | |
| // console.log(MapResults) | |
| console.log("\n%d nanoseconds map", endMAP[1]); | |
| // removal by for loop, similar to above Map function method | |
| const startFor = process.hrtime(); | |
| let forResults = []; | |
| for (let index = 0; index < results.length; index++) { | |
| forResults.push({...results[index]}); | |
| } | |
| const endFor = process.hrtime(startFor); | |
| // console.log(forResults); | |
| console.log("\n%d nanoseconds for", endFor[1]); | |
| // removal by object assign method | |
| const startAssign = process.hrtime(); | |
| const assignResults = []; | |
| for (let index = 0; index < results.length; index++) { | |
| const element = Object.assign({}, results[index]); | |
| assignResults.push(element); | |
| } | |
| const endAssign = process.hrtime(startAssign); | |
| // console.log(assignResults) | |
| console.log("\n%d nanoseconds assign", endAssign[1]); | |
| console.log("\n") | |
| return resolve(forResults); | |
| } else { | |
| return resolve(results); | |
| } | |
| }); | |
| }); | |
| }; |
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This is awesome! Good initiative.