MySQL PDO クエリで「LIKE」を使用すると「bindParam」が失敗するのはなぜですか?

Correcting LIKE Syntax When Using bindParam for MySQL PDO Queries

In MySQL PDO queries, using LIKE with bindParam can be tricky. This question demonstrates a common issue faced when attempting to match usernames beginning with a specific string.

The incorrect syntax provided in the question uses inner single quotes around the $term variable:

$term = "'$term%'";

To fix this, simply remove the inner single quotes:

$term = "$term%";

When using bindParam, PDO automatically handles string quoting. Adding unnecessary quotes within the $term variable can result in incorrect LIKE matching.

The corrected statement should look like this:

$sql = "SELECT username 
        FROM `user` 
        WHERE username LIKE :term 
        LIMIT 10";      

$core = Connect::getInstance();

$stmt = $core->dbh->prepare($sql);
$stmt->bindParam(':term', $term, PDO::PARAM_STR);
$stmt->execute();
$data = $stmt->fetchAll();

This will correctly match usernames that begin with the $term variable, for example "a".

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