What is the usage of sql update statement in php

The sql update statement in php is an UPDATE statement, which is used to update existing records in the database table. Its usage syntax is "UPDATE table_name SET column1=value, column2=value2,... WHERE some_column=some_value" .

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

What is the usage of sql update statement in php?

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!

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:

<?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);
?>

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