In the provided code, what improvements can be made to optimize the execution of multiple update queries?

The issue with the current code is that it is executing multiple update queries in a loop, which can be inefficient and slow. To optimize the execution of multiple update queries, we can use a single SQL query with multiple update statements separated by commas. This way, we can reduce the number of database connections and improve the overall performance. 

// Define an array of update values
$updateValues = [
    ['id' => 1, 'name' => 'John'],
    ['id' => 2, 'name' => 'Jane'],
    ['id' => 3, 'name' => 'Alice']
];

// Build a single SQL query with multiple update statements
$sql = "UPDATE table_name SET name = CASE ";
foreach ($updateValues as $value) {
    $sql .= "WHEN id = {$value['id']} THEN '{$value['name']}' ";
}
$sql .= "END WHERE id IN (" . implode(',', array_column($updateValues, 'id')) . ")";

// Execute the single SQL query
$result = $conn->query($sql);

if ($result) {
    echo "Multiple update queries executed successfully.";
} else {
    echo "Error executing multiple update queries: " . $conn->error;
}

Keywords

PHP optimization multiple update queries batch processing prepared statements

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