Node Session - 4
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This document discusses how to connect to a MySQL database and perform basic CRUD (create, read, update, delete) operations using Node.js. It explains how to install the MySQL module, create a connection, insert records, update records, delete records, select records, and drop a table. Code examples are provided for each operation.
![INSERT INTO statement is used to insert records in MySQL.
Insert Record
var insertquery = "insert into tbl_student(id,name,age)
values ?";
var values = [
[null, 'abc', 22],
[null, 'def', 55]
];
mysql.query(insertquery, [values], function(err,
result)
{
if (err) throw err;
console.log('Record inserted');
});](https://image.slidesharecdn.com/node-iv-180306083729/85/Node-Session-4-5-320.jpg)
Node Session - 4
- 1. Session IV ©Techforce Infotech Pvt Ltd 2017-18
- 2. You have to install MySQL driver to access a MySQL database with Node.js. Download MySQl module from npm. To download and install the "mysql" module, open the Command Terminal and execute the following: Ex:- Connection with MySQL npm install mysql
- 3. Create a js file named "connection.js" having the following code: connection.js:- Connection with MySQL var mysql = require('mysql'); var con = mysql.createConnection({ host: "localhost", //host address user: "root", // username of mysql password: "12345" //password of mysql }); con.connect(function(err) { if (err) throw err; console.log("Connected!"); });
- 4. Now run a js file named "connection.js". Now open the command terminal and use the following command: connection.js:- Connection with MySQL node connection.js
- 5. INSERT INTO statement is used to insert records in MySQL. Insert Record var insertquery = "insert into tbl_student(id,name,age) values ?"; var values = [ [null, 'abc', 22], [null, 'def', 55] ]; mysql.query(insertquery, [values], function(err, result) { if (err) throw err; console.log('Record inserted'); });
- 6. The UPDATE command is used to update records in the table. Update Record var sql = "UPDATE tbl_student SET age = 25 WHERE id=1"; con.query(sql, function (err, result) { if (err) throw err; console.log(result.affectedRows + " record(s) updated"); });
- 7. The DELETE FROM command is used to delete records from the table. Delete Record var sql = "DELETE FROM tbl_student WHERE name = ‘xyz’ "; con.query(sql, function (err, result) { if (err) throw err; console.log("Number of records deleted: " + result.affectedRows); });
- 8. The SELECT command is used to retrieve data from the table. Select Record var sql = "SELECT * from tbl_student"; con.query(sql, function (err, result) { if (err) throw err; console.log(result); });
- 9. The DROP TABLE command is used to delete or drop a table. Drop Table var sql = "DROP TABLE tbl_student"; con.query(sql, function (err, result) { if (err) throw err; console.log("Table deleted"); });
- 10. Session IV completed Address: 403, Venus Benecia, Bodakdev,Ahmedabad – 380053 Reach us : reach@techforceinfotech.com Contact no: +91 (79) 48904529