How can the WHERE clause be used to conditionally update values in a MySQL table using PHP?

To conditionally update values in a MySQL table using PHP, you can use the WHERE clause in your SQL query to specify the condition that must be met for the update to occur. This allows you to update only specific rows that meet certain criteria, rather than updating all rows in the table. By using the WHERE clause effectively, you can target specific data for updating based on your requirements. 

<?php
// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Update values in the table where a specific condition is met
$sql = "UPDATE myTable SET column1 = 'new value' WHERE column2 = 'condition'";

if ($conn->query($sql) === TRUE) {
    echo "Record updated successfully";
} else {
    echo "Error updating record: " . $conn->error;
}

$conn->close();
?>

Keywords

PHP MySQL WHERE clause conditional update values

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