Passing Array of PDO Parameters with LIMIT Clause
Introduction:
When working with PDO, it can be challenging to pass an array of parameters and use the LIMIT clause simultaneously. This article provides a solution to this issue.
Problem Statement:
Given the following SQL query:
SELECT * FROM table WHERE id LIKE CONCAT('%', :id, '%') LIMIT :limit1, :limit2
You want to execute this query using an array of parameters, as seen below:
$stmt->execute($array);
However, using the bindParam() method for the LIMIT parameters (:limit1 and :limit2) results in an error.
Solution:
The solution lies in disabling the default PDO setting of PDO::ATTR_EMULATE_PREPARES. This setting essentially instructs PDO to emulate prepared statements, rather than using them natively.
To disable this setting:
$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
Once this setting is disabled, the query can be prepared and executed with the array of parameters, including the LIMIT values:
$stmt = $pdo->prepare($sql); $stmt->execute(array(5)); //works!
Implications:
Disabling PDO::ATTR_EMULATE_PREPARES can improve performance, as it removes the overhead of emulating prepared statements. However, it should be noted that this setting is enabled by default due to performance reasons.
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