What is the database modification statement in php

php's database modification statement is UPDATE, which is used to update existing records in the database table. The syntax is "UPDATE table_name SET column1=value, column2=value2,...WHERE some_column=some"; where The WHERE clause specifies which records need to be updated. If omitted, all records will be updated.

The operating environment of this tutorial: Windows 7 system, PHP 8 version, DELL G3 computer.

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

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 want to leave out the WHERE clause, all records will be updated!

To learn more about SQL, visit our SQL tutorials.

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 the MySQL connection.

Example

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

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

<?php
$con=mysqli_connect("localhost","username","password","database");
// 检测连接
if (mysqli_connect_errno())
{
    echo "连接失败: " . mysqli_connect_error();
}
mysqli_query($con,"UPDATE Persons SET Age=36
WHERE FirstName=&#39;Peter&#39; AND LastName=&#39;Griffin&#39;");
mysqli_close($con);
?>

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

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