PHP で PDO を使用してデータベースから単一の値を取得する方法

Retrieving a Single Value from Database Using PDO in PHP

In this question, the user seeks a more concise method to retrieve a single value from a database using PDO in PHP. The existing code used multiple lines and fetching techniques, which can be considered verbose.

An efficient solution to this problem is to utilize the fetchColumn() method provided by PDO. By employing this approach, you can retrieve a single value directly without requiring a loop or multiple fetching steps.

Updated Code:

$q = $conn->prepare("SELECT name FROM `login_users` WHERE username=?");
$q->execute([$userid]);
$username = $q->fetchColumn();

In this code, the $q object represents the prepared statement, and the execute() method is used to execute the prepared statement with the specified parameter value ($userid). Finally, the fetchColumn() method is invoked to retrieve the first column of the result set, which contains the desired value (name).

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