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PHP Update Data in MySQL

The UPDATE statement is used to modify data in a database table.


Update data in the database

The UPDATE statement is used to update a record that already exists in a database table.

Syntax

UPDATE table_name
SET column1=value, column2=value2,...
WHERE some_column=some_value

Note: Note the WHERE clause in the UPDATE syntax. The WHERE clause specifies which records need to be updated. If you want to omit the WHERE clause, all records will be updated!

To learn more about SQL, please visit our SQL Tutorial .

In order for PHP to execute the above statement, we must use the mysqli_query () function. This function is used to send a query or command to a MySQL connection.

Example

In the previous chapters of this tutorial, we created a table named "Persons" as follows:

FirstName LastName Age
Peter Griffin 35
Glenn Quagmire 33

The following example updates some data in the "Persons" table:

<?php
$con=mysqli_connect("localhost","username","password","database");
//Detect connection
if (mysqli_connect_errno())
{
    echo "Connection failed: " . mysqli_connect_error();
}

mysqli_query($con,"UPDATE Persons SET Age=36
WHERE FirstName='Peter' AND LastName='Griffin'");

mysqli_close($con);
?>

After this update, the "Persons" table looks like this:

FirstName LastName Age
Peter Griffin 36
Glenn Quagmire 33