PHP MySQL Update

The UPDATE statement is used to modify data in database tables.

Updating Data in the Database

The UPDATE statement is used to update existing records in database tables.

Syntax

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

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

To learn more about SQL, please visit ourSQL Tutorial。

For PHP to execute the above statement, we must use the mysqli_query() function. This function is used to send queries or commands to the MySQL connection.

Example

In an earlier chapter 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:

Example

<?php
$con=mysqli_connect("localhost","username","password","database");
// Check 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
Other Extensions