Use NodeJS to run an SQL file in MySQL - mysql

Question

I am using the mysql plugin for nodejs and it is fantastic at doing everything I need so far.
However I have come across a stumbling block. I have created a MySQL provider that exports a mysql pool:
var mysql = require('mysql');
var mysqlPool = mysql.createPool({
host : '127.0.0.1',
user : 'root',
password : ''
});
mysqlPool.getConnection(function(err, connection) {
connection.query("INSERT INTO ....
I can select, create, insert, etc all fine, but I've come across a task where I would like to run a small SQL string with about 10 different commands together. I've thought about doing one of the following:
Execute a SQL file against a database using mysql
Run a query and enable multipleStatements
I have written some code to execute mysql as a child process, but I would really love to avoid doing this:
var cp = require("child_process");
var cmdLine = "mysql --user=autobuild --password=something newdb < load.sql";
cp.exec(cmdLine, function(error,stdout,stderr) {
console.log(error,stdout,stderr);
});
The problem with option two is I would rather not enable multipleStatements for every query, just this one particular one. I have thought about creating a new connection, but just thinking of other ways this could be done.
TL;DR?
Using NodeJS and MySQL how can I execute the following into a database:
CREATE TABLE pet (name VARCHAR(20), owner VARCHAR(20) );
CREATE TABLE sofa (name VARCHAR(20), owner VARCHAR(20) );
CREATE TABLE table (name VARCHAR(20), owner VARCHAR(20) );
Thanks so much for anyone who shares their ideas

Answer 1

You can use the connection option called multipleStatements:
// Works with the pool too.
var connection = mysql.createConnection({multipleStatements: true});
Then, you can pass the queries like these:
connection.query('CREATE 1; CREATE 2; SELECT 3;', function(err, results) {
if (err) throw err;
// `results` is an array with one element for every statement in the query:
console.log(results[0]); // [create1]
console.log(results[1]); // [create2]
console.log(results[2]); // [select3]
});

Answer 2

Here is a big .sql file friendly way to progmatically execute multiple queries against MySQL without using the multipleStatements property and a massive buffer. Please note this is not the most efficient way to upload to mysql.
var mysql = require('mysql');
var fs = require('fs');
var readline = require('readline');
var myCon = mysql.createConnection({
host: 'localhost',
port: '3306',
database: '',
user: '',
password: ''
});
var rl = readline.createInterface({
input: fs.createReadStream('./myFile.sql'),
terminal: false
});
rl.on('line', function(chunk){
myCon.query(chunk.toString('ascii'), function(err, sets, fields){
if(err) console.log(err);
});
});
rl.on('close', function(){
console.log("finished");
myCon.end();
});

Answer 3

Looks like there is a module for this purpose: execsql

Answer 4

This will do the trick:
var express = require("express");
var bodyParser = require("body-parser");
var mysql = require('mysql');
var fs = require('fs');
var app = express();
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.use(express.static(__dirname));
var defaultConnection = mysql.createConnection({
host : 'localhost',
user : 'root',
password : '',
database: 'utpDatabase'
});
function dbCall_file (endpoint, operation, settings, filename){
app.post(endpoint, function(request, response){
var data = request.body;
var path = 'path/to/queries/' + filename
var connection = (settings == 'default') ? defaultConnection : settings;
var callback = function(arg){
var query = arg.replace(/{{[ ]{0,2}([a-zA-Z0-9\.\_\-]*)[ ]{0,2}}}/g, function(str, mch){ return data[mch]});
connection.query(query, function(err, rows){
if (!err){
var toClient = (operation == 'select') ? rows : {success: true};
response.send(toClient);
} else {
console.log(err);
response.send({error: err, query: query});
}
});
};
fs.readFile(path, 'utf8', function(err, data){
if (!err){
callback(data);
} else {
callback(err);
}
});
});
};
Then in your .sql file wrap your node variables in double curlies- for example, if you want to query first names for node variable data.firstName from your post call:
SELECT * FROM users WHERE name={{ firstName }}