MySQL 存储过程在错误时无法回滚

Question

如果事务中的任何语句失败，我会尝试回滚事务。

这些表是 InnoDB 并且 SELECT 'ROLLBACK' 被触发，所以我知道 ROLLBACK 也应该是。

事务没有回滚。任何想法为什么？

DELIMITER $$
DROP PROCEDURE IF EXISTS spTest;
CREATE PROCEDURE `spTest`(
    IN vUserID BIGINT,
    IN vSessionRef VARCHAR(50)
)

BEGIN
    DECLARE vUserSessionID BIGINT;
    DECLARE vUserSessionIDVersionCurr INT;
    DECLARE vUserSessionIDVersionNew INT;   
    
    DECLARE EXIT HANDLER FOR SQLEXCEPTION
    BEGIN
        SELECT 'ROLLBACK'; /* This is returned so we know the error was triggered */
        ROLLBACK; 
    END;


    START TRANSACTION;
        SELECT UserSessionID INTO vUserSessionID FROM tblUserSessions WHERE UserID = vUserID AND SessionRef = vSessionRef AND isCurrent = 1 ORDER BY VersionStartDateTime DESC LIMIT 1;
        SELECT VersionID INTO vUserSessionIDVersionCurr FROM tblUserSessions WHERE UserID = vUserID AND SessionRef = vSessionRef AND isCurrent = 1 ORDER BY VersionStartDateTime DESC LIMIT 1;  

        DROP TABLE IF EXISTS tmpUserSessionCurr;
        CREATE TEMPORARY TABLE tmpUserSessionCurr SELECT * FROM tblUserSessions WHERE UserID = vUserID AND SessionRef = vSessionRef AND isCurrent = 1 ORDER BY VersionStartDateTime DESC LIMIT 1;
        
        /* This inserted record is not rolled back */
        INSERT INTO tblUserSessions (UserSessionID, EntityID, SessionRef, UserID, ValidUntil, CreatedOn, CreatedBy, LastUpdatedOn, LastUpdatedBy, isDeleted, isCurrent)
        SELECT vUserSessionID, EntityID, SessionRef, UserID, (now() + INTERVAL 5 MINUTE), CreatedOn, CreatedBy, NOW(), 'spUserSessionCreate', 0, 1 FROM tmpUserSessionCurr;
        
        /* Deliberately using a wrongly spelt field name in the statement below to trigger and exception in order to test the rollback*/
        SELECT VersionID INTO vUserSessionIDVersionNew FROM tblUserSessions WHERE UserID = vUserID AND SessionRef = vSessionRef AND NOW() BETWEEN VersionStartDateTime AND ValidUntil AND isCurrent = 1 ORDER BY VersionStartDateTime DESC LIMIT 1;
    
        UPDATE tblUserSessions 
        SET LastUpdatedBy = "spUserSessionCreate", isCurrent = 0, VersionEndDateTime = NOW() 
        WHERE UserSessionID = vUserSessionID AND VersionID = vUserSessionIDVersionCurr;
        
        SELECT 'UPDATED' AS vStatus, UserSessionID, VersionID, EntityID, SessionRef, UserID, CreatedOn, ValidUntil FROM tblUserSessions WHERE UserID = vUserID AND SessionRef = vSessionRef AND NOW() BETWEEN VersionStartDateTime AND ValidUntil AND isCurrent = 1 ORDER BY VersionStartDateTime DESC LIMIT 1; 
        
        /* -------------------- */
        SELECT 'COMMIT';
        COMMIT;  /* In the even of a SQL Error, this point will not be reached */
    /* -------------------- */


END
$$
DELIMITER ;

Answer 1

我推测事务中的某些内容一定会影响回滚，因此查看了其中不需要的内容，接近末尾的 SELECT 语句和 DROP TABLE。

看起来DROP TABLE 是罪魁祸首。我将它移到（之前）事务之外并且回滚工作正常。