MySQL的CONTINUE HANDLER 迁移MySQL业务时,遇到了MySQL的CONTINUE HANDLER FOR not found用法。详情如下:-- 表DDL create table t1(c1 int primary key, c2 int); create table t2(c1 int primary key, c2 int); -- 数据 insert into t1 values(1,1),(2,2); insert into t2 values(1,11); commit; ...
DECLARE continue_handler_name CONTINUE HANDLER FOR NOT FOUND set_clause; continue_handler_name:处理程序的名称,可以根据需要自定义。 CONTINUE:表示这是一个继续处理程序,当处理程序被触发时,存储过程会继续执行后续的代码。 HANDLER:关键字,表示这是一个处理程序。 FOR NOT FOUND:表示这个处理程序是在游标遍历到...
DECLARE@foundINTDEFAULT0;DECLARECONTINUEHANDLERFORNOTFOUNDSET@found=1;IF@found=1THEN-- 游标未找到的操作ELSE-- 游标找到的操作ENDIF; 1. 2. 3. 4. 5. 6. 7. 8. 9. 在上面的代码中,我们使用DECLARE语句声明了一个名为@found的变量,并将其默认值设置为0。然后,我们使用DECLARE CONTINUE HANDLER语句来...
DECLARE CONTINUE HANDLER FOR not found SET s=1; OPEN cur1; r_loop: LOOP IF s = 1 THEN LEAVE r_loop; END IF; -- 如果游标fetch结果not found,则设置s=1 FETCH cur1 INTO v1; IF s = 0 THEN -- 如果查询结果not found,则设置s=1 select c2 into v2 from t2 where c1=v1; -- 调试...
DECLARE CONTINUE HANDLER是MySQL存储过程(Stored Procedure)或函数(Function)中的一种声明,用于定义当特定条件发生时应该执行的操作。CONTINUE关键字指示MySQL在遇到指定的条件时不应中断当前块(如循环或游标处理)的执行,而是继续执行后续语句。 2. 阐述DECLARE CONTINUE HANDLER FOR NOT FOUND的用法 DECLARE CONTINUE HANDL...
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET l_error=1; § 如果发生任何错误(不是 NOT FOUND), 执行 ROLLBACK和产生一条错误消息后退出当前块或存储过程。 DECLARE EXIT HANDLER FOR SQLEXCEPTION BEGIN ROLLBACK; SELECT 'Error occurred – terminating'; ...
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE; OPEN employee_cursor; read_loop: LOOP FETCH employee_cursor INTO emp_salary; IF done THEN LEAVE read_loop; END IF; SET total_salary = total_salary + emp_salary; END LOOP; CLOSE employee_cursor; SELECT total_salary; END // DELIMITE...
CREATEPROCEDUREPROC2()BEGIN--定义两个存放结果的变量DECLAREFLAGINTDEFAULT0;DECLARENAMEVARCHAR(20);DECLAREADDRVARCHAR(50);--声明游标DECLAREMYCURSORFORSELECT姓名,地址FROMcustomers;DECLARECONTINUEHANDLERFORNOTFOUNDSETFLAG=1;--打开游标OPENMY;--循环体部分L1:LOOP--获取结果FETCHMYINTONAME,ADDR;IFFLAG=1THENLEAV...
Continue Handler problemPosted by: John Noble Date: January 16, 2023 01:13PM Hi folks, I have getting a problem with my continuehandler. It is setting the vFInished value to 1 too early. Here is my code... DECLARE CONTINUE HANDLER FOR NOT FOUND SET vfinished = 1; SET v...
步骤一:声明 continue handler 在使用 continue handler 之前,我们需要先声明它。continue handler 需要指定异常类型和需要执行的语句。例如,我们可以声明一个 continue handler 来处理 ‘NOT FOUND’ 异常,并执行一条简单的记录日志语句。 DECLAREcontinueHANDLERFORNOTFOUNDBEGININSERTINTOlog_table(message)VALUES('No mor...