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Node.js MySQL Insert Into

FOLASAYO SAMUEL OLAYEMI's photo
FOLASAYO SAMUEL OLAYEMI
·Apr 16, 2022·

3 min read

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Table of contents

  • Insert Multiple Records
  • The Result Object
  • Get Inserted ID

To fill a table in MySQL, use the "INSERT INTO" statement.

Let us show some code sample by inserting a record in the "customers" table:

const mysql = require('mysql');

const con = mysql.createConnection({
  host: "localhost",
  user: "yourusername",
  password: "yourpassword",
  database: "mydb"
});

con.connect(function(err) {
  if (err) throw err;
  console.log("Connected!");
  const sql = "INSERT INTO customers (name, address) VALUES ('Company Inc', 'Highway 37')";
  con.query(sql, function (err, result) {
    if (err) throw err;
    console.log("1 record inserted");
  });
});

Now, save the code above in a file called "demo_db_insert.js", and run the file on your terminal with the command: node demo_db_insert.js

This will give you this result:

Connected!
1 record inserted

Insert Multiple Records

To insert more than one record, make an array containing the values, and insert a question mark in the sql, which will be replaced by the value array:

INSERT INTO customers (name, address) VALUES ?

Now, fill the "customers" table with data.

Code Sample:

const mysql = require('mysql');

const con = mysql.createConnection({
  host: "localhost",
  user: "yourusername",
  password: "yourpassword",
  database: "mydb"
});

con.connect(function(err) {
  if (err) throw err;
  console.log("Connected!");
  const sql = "INSERT INTO customers (name, address) VALUES ?";
  const values = [
    ['John', 'Highway 71'],
    ['Peter', 'Lowstreet 4'],
    ['Amy', 'Apple st 652'],
    ['Hannah', 'Mountain 21'],
    ['Michael', 'Valley 345'],
    ['Sandy', 'Ocean blvd 2'],
    ['Betty', 'Green Grass 1'],
    ['Richard', 'Sky st 331'],
    ['Susan', 'One way 98'],
    ['Vicky', 'Yellow Garden 2'],
    ['Ben', 'Park Lane 38'],
    ['William', 'Central st 954'],
    ['Chuck', 'Main Road 989'],
    ['Viola', 'Sideway 1633']
  ];
  con.query(sql, [values], function (err, result) {
    if (err) throw err;
    console.log("Number of records inserted: " + result.affectedRows);
  });
});

Now, save the code above in a file called "demo_db_insert_multple.js", and run the file on your terminal with this command: node demo_db_insert_multiple.js

This will give you this result:

Connected!
Number of records inserted: 14

The Result Object

When executing a query, a result object is returned. The result object contains information about how the query affected the table. The result object returned from the example above looks like this:

{
  fieldCount: 0,
  affectedRows: 14,
  insertId: 0,
  serverStatus: 2,
  warningCount: 0,
  message: '\'Records:14  Duplicated: 0  Warnings: 0',
  protocol41: true,
  changedRows: 0
}

The values of the properties can be displayed like this:

Now, return the number of affected rows:

console.log(result.affectedRows)

This will produce this result:

14

Get Inserted ID

For tables with an auto increment id field, you can get the id of the row you just inserted by asking the result object.

Note: To be able to get the inserted id, only one row can be inserted.

Now, insert a record in the "customers" table, and return the ID:

const mysql = require('mysql');

const con = mysql.createConnection({
  host: "localhost",
  user: "yourusername",
  password: "yourpassword",
  database: "mydb"
});

con.connect(function(err) {
  if (err) throw err;
  const sql = "INSERT INTO customers (name, address) VALUES ('Michelle', 'Blue Village 1')";
  con.query(sql, function (err, result) {
    if (err) throw err;
    console.log("1 record inserted, ID: " + result.insertId);
  });
});

Save the code above in a file called "demo_db_insert_id.js", and run the file:

node demo_db_insert_id.js

This will give you something like this in return:

1 record inserted, ID: 15

Thanks for reading...

Happy Coding!

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