DB2トリガー定義

Question

私は手順VOTES_COUNTを使用しているDB2トリガーを作成しようとしていますが、私はトリガーを作成しようとすると、私はエラーを取得する：

An unexpected token "" was found following "". Expected tokens may include: "SET status = 1".. SQLCODE=-104, SQLSTATE=42601, DRIVER=4.7.89

は、ここに私のコードです：

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 @ 

私が間違っていることを教えてもらえますか？

Answer 1

あなたはストアドプロシージャせずにこれを行うことができます。

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 @