Which Method is More Efficient for Inserting Multiple Rows into a MySQL Table with PDO: Iterative Insert or Batch Insert?

Inserting Multiple Rows with PDO MySQL: Performance and Efficiency

When inserting multiple rows into a MySQL table using PDO, there are several approaches to consider. This question explores the relative efficiency and safety of two common methods:

Method 1: Iterative Insert Using foreach

$stmt = $db->prepare($sql);

foreach ($rows as $row) {
  $stmt->execute($row);
}

Method 2: Batch Insert using Concatenation

$sql = "insert into `table_name` (col1, col2, col3) values ";
$sql .= //not sure the best way to concatenate all the values, use implode?
$stmt = $db->prepare($sql)->execute();

Performance Considerations

The batch insert (Method 2) is generally faster than the iterative insert (Method 1) because it reduces the number of queries sent to the database. However, in most practical scenarios, the performance difference is negligible.

Safety and Reliability

Both methods are safe and reliable when used correctly. To prevent SQL injection vulnerabilities, it's important to use prepared statements and parameterized queries.

Best Approach

The best approach depends on the specific requirements of your application:

• Method 1 (Iterative Insert) is simpler to implement and suitable for small or medium-sized data sets.
• Method 2 (Batch Insert) is more efficient for large data sets, but it requires more complex code.

Consider the folgenden code as a modified version of Method 2, using implode() for value concatenation and parameterization for improved safety:

$sql = "insert into `table_name` (col1, col2, col3) values ";

$paramArray = array();
$sqlArray = array();

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);

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