如何使用CASE WHEN在MySQL和PDO中运行更新查询.
以下查询将CASE列更新为0.
$query= "Update payments SET
total = :total,paid = CASE
WHEN paid > :new THEN paid = :new
ELSE paid
END,due = CASE
WHEN paid < :new THEN due = :new - paid
ELSE due
END
WHERE id = :id ";
$update= $db->prepare($query);
$update->bindparam(':total',$new);
$update->bindparam(':new',$new);
$update->bindparam(':id',$id);
$update->execute();
最佳答案
请勿尝试将值分配给CASE WHEN语句内的列,因为您已经在这样做了.
CASE WHEN将评估为满足条件的值.
试试这个代码
CASE WHEN将评估为满足条件的值.
试试这个代码
UPDATE payments SET
total = :total,paid = (CASE WHEN paid > :new THEN :new ELSE paid END),due = (CASE WHEN paid < :new THEN (:new - paid) ELSE due END)
WHERE id = :id
我删除了case语句中对pay和due列的分配.
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