Question

我对MySQL很新，并且遇到了我的程序错误，我希望能够为我的表更新，插入和删除调用相同的东西，因此需要一个程序来调用。我看过MySQL Fire Trigger for both Insert and Update和The MySQL "DELIMITER" keyword isn't working以及其他一些但没有任何帮助。（delimiter关键字也不起作用产生一个sepperate错误，但没有帮助）错误是这个，我无法解决它的含义：

＆＃34;错误 SQL查询：

-- trigger on work log change
DROP PROCEDURE IF EXISTS PROC_TRACK_CHANGES CREATE DEFINER = root@localhost PROCEDURE PROC_TRACK_CHANGES BEGIN INSERT INTO CHANGES( LoggedTimeStamp, EmployeeID, LogTimeStamp, ProposalID, WorkDone ) 
SELECT NOW( ) , EmployeeID, LogTimeStamp, ProposalID, WorkDone
FROM WORKLOG;

MySQL说：

＃1064 - 您的SQL语法出错;查看与您的MySQL服务器版本对应的手册，以便在＃＆quot; CREATE DEFINER = root @ localhost PROCEDURE PROC_TRACK_CHANGES附近使用正确的语法开始插入＆＃39;在第3行＆＃34;

有问题的错误代码是：

CREATE TABLE WORKLOG(
EmployeeID              BIGINT UNSIGNED NOT NULL UNIQUE, -- FKEY PKEY
LogTimeStamp            TIMESTAMP, -- PKEY
ProposalID              BIGINT UNSIGNED NOT NULL UNIQUE, -- FKEY
WorkDone                VARCHAR(200),
CONSTRAINT WORKLOG_FOREIGN_KEY_EMP FOREIGN KEY (EmployeeID) REFERENCES EMPLOYEES (EmployeeID),
CONSTRAINT WORKLOG_FOREIGN_KEY_PRO FOREIGN KEY (ProposalID) REFERENCES PROPOSALS (ProposalID),
CONSTRAINT WORKLOG_PROPOSALS_PRIMARY_KEY PRIMARY KEY (EmployeeID, LogTimeStamp)
);

CREATE TABLE CHANGES(
LoggedTimeStamp         TIMESTAMP, -- PKEY
EmployeeID              BIGINT UNSIGNED NOT NULL UNIQUE, -- FKEY
LogTimeStamp            TIMESTAMP, -- fkey
ProposalID              BIGINT UNSIGNED NOT NULL UNIQUE, -- FKEY
WorkDone                VARCHAR(200),
CONSTRAINT CHANGES_FOREIGN_KEY_EMP FOREIGN KEY (EmployeeID) REFERENCES EMPLOYEES (EmployeeID),
CONSTRAINT CHANGES_FOREIGN_KEY_PRO FOREIGN KEY (ProposalID) REFERENCES PROPOSALS (ProposalID),
CONSTRAINT CHANGES_PRIMARY_KEY PRIMARY KEY (LoggedTimeStamp)
);

-- trigger on work log change
DROP PROCEDURE IF EXISTS PROC_TRACK_CHANGES
CREATE DEFINER=root@localhost PROCEDURE PROC_TRACK_CHANGES
BEGIN
    INSERT INTO CHANGES (LoggedTimeStamp, EmployeeID, LogTimeStamp, ProposalID, WorkDone)
    SELECT now(), EmployeeID, LogTimeStamp, ProposalID, WorkDone FROM WORKLOG;
END;

DROP TRIGGER IF EXISTS TR_WORKLOG_UPDATE
CREATE DEFINER=root@localhost TRIGGER TR_WORKLOG_UPDATE
    BEFORE UPDATE ON 'WORKLOG'
    FOR EACH ROW
BEGIN
    CALL PROC_TRACK_CHANGES();
END;

DROP TRIGGER IF EXISTS TR_WORKLOG_INSERT
CREATE DEFINER=root@localhost TRIGGER TR_WORKLOG_INSERT BEFORE INSERT ON WORKLOG
FOR EACH ROW
BEGIN
    CALL PROC_TRACK_CHANGES();
END;

DROP TRIGGER IF EXISTS TR_WORKLOG_DELETE
CREATE DEFINER=root@localhost TRIGGER TR_WORKLOG_DELETE BEFORE DELETE ON WORKLOG
FOR EACH ROW
BEGIN
    CALL PROC_TRACK_CHANGES();
END;

这可能是我想要的简单但MYSQL调试器让我感到困惑。非常感谢！

Answer 1

试试这个：

DROP PROCEDURE IF EXISTS PROC_TRACK_CHANGES;

注意最后的分号。

Answer 2

过程drop也是单个语句和过程create。用分隔符分隔它们。

另一件事是你需要定义另一个分隔符而不是;。否则，DB将对;处的每个语句进行终结，这使得某些触发器和过程定义不完整。所以使用例如

delimiter |
DROP PROCEDURE IF EXISTS PROC_TRACK_CHANGES
|
CREATE DEFINER=root@localhost PROCEDURE PROC_TRACK_CHANGES
BEGIN
    INSERT INTO CHANGES (LoggedTimeStamp, EmployeeID, LogTimeStamp, ProposalID, WorkDone)
    SELECT now(), EmployeeID, LogTimeStamp, ProposalID, WorkDone FROM WORKLOG;
END
|

Answer 3

您应该指定除分号以外的临时分隔符，并在DROP PROCEDURE和CREATE PROCEDURE语句的末尾使用该分隔符。

此外，您需要在CREATE PROCEDURE语句中的过程名称后添加括号，即使它不带参数。

这应该适合你：

DELIMITER $$

DROP PROCEDURE IF EXISTS PROC_TRACK_CHANGES $$

CREATE DEFINER=root@localhost PROCEDURE PROC_TRACK_CHANGES ()
BEGIN
    INSERT INTO CHANGES (LoggedTimeStamp, EmployeeID, LogTimeStamp, ProposalID, WorkDone)
    SELECT now(), EmployeeID, LogTimeStamp, ProposalID, WorkDone FROM WORKLOG;
END $$

DELIMITER ;

MYSQL：程序和触发器错误

3 个答案: