How to Efficiently Insert Multiple Rows Using PDO in MySQL?

Efficiently Inserting Multiple Rows Using PDO in MySQL

When faced with the task of inserting multiple rows into a MySQL table, developers often ponder the best approach to use PDO. There are two primary options: executing the rows one by one or concatenating the SQL statement and executing it as a batch.

Option 1: Individual Row Execution

This approach involves preparing the SQL statement and executing it for each row separately:

$sql = "insert into `table_name` (col1, col2, col3) values (?, ?, ?)";
$stmt = $db->prepare($sql);
foreach ($rows as $row) {
    $stmt->execute($row);
}

Option 2: Batch Insertion

In this approach, the SQL statement is concatenated with the rows' values and then executed as a single command:

$sql = "insert into `table_name` (col1, col2, col3) values ";
$paramArray = [];
$sqlArray = [];
foreach ($rows as $row) {
    $sqlArray[] = '(' . implode(',', array_fill(0, count($row), '?')) . ')';
    foreach ($row as $element) {
        $paramArray[] = $element;
    }
}
$sql .= implode(',', $sqlArray);
$stmt = $db->prepare($sql);
$stmt->execute($paramArray);

Performance Considerations

While the batch insertion approach is theoretically faster, the actual performance difference between the two options is often negligible. In most cases, the time saved by executing the statement once will be offset by the overhead of concatenating the values.

Security Considerations

Both approaches are considered secure as they use prepared statements to prevent SQL injection attacks.

Recommendation

For simplicity and ease of implementation, the individual row execution approach is generally recommended. However, if performance is a critical concern, the batch insertion approach can be explored.

Additional Notes

• Both approaches can be used to insert any number of rows.
• The question and answer provided assume a static list of values to be inserted. For dynamic values, the parameter binding method can be used to avoid concatenating the SQL statement.

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