Which Approach is Better for Inserting Multiple Rows in PHP PDO MySQL?

Inserting Multiple Rows in PHP PDO MySQL: Code Comparison and Optimization

When dealing with the need to insert multiple rows into a MySQL table using PHP PDO, developers may encounter two primary approaches.

Approach 1:

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

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

Approach 2:

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

Code performance and safety:

Both approaches are viable, but they differ in terms of execution speed and security.

Approach 1:

• Pros: Simple and easy to implement.
• Cons: Can be slow for large datasets due to separate executions for each row.

Approach 2:

• Pros: Faster than Approach 1 for large datasets as it performs a batch insert.
• Cons: Requires careful concatenation of values, increasing the risk of SQL injection attacks (use parameterized queries to prevent).

Opting for the best approach:

The optimal approach depends on the size of the dataset being inserted. For small datasets, either method is suitable. For large datasets where speed is crucial, Approach 2 with parameterized queries is recommended.

Additional Optimization:

The batch insert in Approach 2 can be further optimized by concatenating the placeholders before executing the query:

$sqlArray = array();
foreach($rows as $row){
    $sqlArray[] = '(' . implode(',', array_fill(0, count($row), '?')) . ')';
}
$sql .= implode(',', $sqlArray);

This significantly reduces the number of placeholders that need to be bound before execution, enhancing performance.

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