DB2 触发器定义

Question

我正在尝试创建使用过程 VOTES_COUNT 的 DB2 触发器，但是当我尝试创建触发器时出现错误：

在“”之后发现了一个意外的标记“”。预期的代币可能 包括：“SET status = 1”.. SQLCODE=-104，SQLSTATE=42601， 驱动程序=4.7.89

这是我的代码：

CREATE PROCEDURE VOTES_COUNT (IN username VARCHAR(15), OUT votesCount INT)
DYNAMIC RESULT SETS 1

P1: BEGIN

DECLARE C1 CURSOR FOR 
    SELECT COUNT(*) AS R1
        FROM VOTES
        WHERE USER = username;
OPEN C1;    
FETCH C1 INTO votesCount;   
CLOSE C1;

END P1 @

CREATE TRIGGER UPDATE_LEVEL
AFTER INSERT ON VOTES
REFERENCING NEW AS N
FOR EACH ROW
BEGIN ATOMIC
    DECLARE num INT;
    DECLARE status INT;
    CALL VOTES_COUNT(N.USERNAME, num);
    CASE
        WHEN num >= 300 
            THEN SET status = 5;
        WHEN num < 300 AND num >= 200
            THEN SET status = 4;
        WHEN num < 200 AND num >= 100
            THEN SET status = 3;
        WHEN num < 100 AND num >= 50
            THEN SET status = 2;
        ELSE
            SET status = 1;
    END CASE;
    UPDATE USERS SET STATUS = status WHERE USERNAME = N.USERNAME;
END @

你能告诉我我做错了什么吗？

Answer 1

你可以在没有存储过程的情况下做到这一点：

CREATE TRIGGER UPDATE_LEVEL
AFTER INSERT ON VOTES
REFERENCING NEW AS N
FOR EACH ROW MODE DB2SQL
BEGIN ATOMIC
    DECLARE votesCount INT;
    DECLARE userStatus INT;     
    SET votesCount = (SELECT COUNT(*)
    FROM USERS
    WHERE USERNAME = N.USERNAME); 

    IF votesCount >= 300 THEN
        SET userStatus = 5;
    ELSEIF votesCount < 300 AND votesCount >= 200 THEN
        SET userStatus = 4;
    ELSEIF votesCount < 200 AND votesCount >= 100 THEN
        SET userStatus = 3;
    ELSEIF votesCount < 100 AND votesCount >= 50 THEN
        SET userStatus = 2;
    ELSE
        SET userStatus = 1;
    END IF;

    UPDATE USERS SET STATUS = userStatus WHERE USERNAME = N.USERNAME;
END @