Question

我只是想为我的phpmyadmin创建一个触发器。基本上，预期的功能是每当我更新财务表的信用列时，余额列将自动更新每行。

我的节目是：

    CREATE TRIGGER UPDATE_BALANCE AFTER UPDATE financeofstudents
    FOR EACH ROW
    BEGIN
    IF financeofstudents.credit > 0 
    AND
    financeofstudents.credit <= financeofstudents.debit
    THEN
    UPDATE financeofstudents SET financeofstudents.balance = financeofstudents.debit-    financeofstudents.credit;
    END IF;
    END

但它给了我这个错误：

    Error

SQL query:

CREATE TRIGGER UPDATE_BALANCE AFTER UPDATE financeofstudents
FOR EACH ROW
BEGIN
IF financeofstudents.credit > 0 
AND
financeofstudents.credit <= financeofstudents.debit
THEN
UPDATE financeofstudents SET financeofstudents.balance = financeofstudents.debit-financeofstudents.credit

MySQL said: Documentation
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'financeofstudents
FOR EACH ROW
BEGIN
IF financeofstudents.credit > 0
AND
f' at line 1

我不知道问题出在哪里。专家们，请帮助我。

Answer 1

错误消息是一个有用的提示。它表示 ..要在foreach($_POST['commit_date'] as $commitdate) { foreach($_POST['unit'] as $units) { echo $units .= $commitdate . "<br/>"; } }附近使用正确的语法。

在您的情况下，您需要在表名前加上'some text from your query starting with the first thing it didn't understand'一词。

ON

如果您发现MySQL错误消息难以解释，那么您就是正确的。

无法在PHPMyAdmin中创建触发器

1 个答案: