What are the pitfalls of using multiple queries in a loop to update database records in PHP?

Using multiple queries in a loop to update database records in PHP can be inefficient and lead to performance issues. Instead, you can optimize this process by using a single query with a WHERE clause to update multiple records at once. 

// Example of updating multiple records in a database using a single query with a WHERE clause

// Connect to the database
$connection = new mysqli("localhost", "username", "password", "database");

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

// Array of record IDs to update
$record_ids = [1, 2, 3, 4, 5];

// New value to set for the records
$new_value = "updated";

// Generate a comma-separated list of record IDs
$record_ids_list = implode(",", $record_ids);

// Update records with a single query
$sql = "UPDATE table_name SET column_name = '$new_value' WHERE id IN ($record_ids_list)";
if ($connection->query($sql) === TRUE) {
    echo "Records updated successfully";
} else {
    echo "Error updating records: " . $connection->error;
}

// Close connection
$connection->close();

Keywords

SQL injection performance database locks transaction batch processing

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