Mysql光標參數

Question

我是mysql新手，在oracle中我們可以通過使用遊標參數來實現。

我想打印

OUTPUT : 
Department number 
10 
EMPLOYEE DETAILS 
Ravi Kumar 3000 10 
vijay Kumar 5000 10 
Department number 
20 
EMPLOYEE DETAILS 
John NULL 3000 10 

下面是我的代碼

 CREATE PROCEDURE xx_dept_emp_dtls(OUT X_STATUS VARCHAR(200)) 
    BEGIN 
     DECLARE l_department_id 
      ,l_employee_id 
      ,l_dept_id INT ; 
     DECLARE l_first_name 
      ,l_last_name 
      ,l_job_id VARCHAR(50) ; 
     DECLARE d BOOLEAN DEFAULT FALSE ;  
     DECLARE cur_dept CURSOR FOR SELECT department_id FROM dept WHERE DEPARTMENT_ID in(SELECT DEPARTMENT_ID FROM EMP); 
     DECLARE cur_emp CURSOR FOR SELECT first_name,last_name,last_name FROM EMP WHERE department_id =l_department_id ; 
     DECLARE CONTINUE HANDLER FOR NOT FOUND SET d = TRUE ; 
     DECLARE CONTINUE HANDLER FOR 1329 SET X_STATUS = 'error' ; 
     DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SELECT 'PROGRAM ERROR PLEASE CHECK'; 
     SELECT 1; 
     OPEN cur_dept ; 
     l_dept: LOOP 
     FETCH cur_dept INTO l_department_id ; 
     IF d then 
     CLOSE cur_dept ; 
     Leave l_dept ; 
     END IF ; 
     SELECT l_department_id ; 
     OPEN cur_emp ; 
     l_emp: LOOP 
     SELECT 2; 
     FETCH cur_emp INTO l_first_name 
          ,l_last_name 
          ,l_job_id 
          ; 
     IF d then 
     CLOSE cur_emp ; 
     Leave l_emp ; 
     END IF ;  
     SELECT l_first_name 
      ,l_last_name 
      ,l_job_id 
      ,l_dept_id ; 
     END LOOP l_emp; 
     END LOOP l_dept; 
    END ; 

所以其未來的第一記錄
請幫我從上面的輸出

Answer 1

最後得到了解決。

CREATE PROCEDURE XX_MULTI_CURSOR() 
BLOCK1: begin 
    declare v_col1 int;      
    declare no_more_rows1 boolean DEFAULT FALSE; 
    declare cursor1 cursor for    
     select DEPARTMENT_ID 
     from DEPT 
     where DEPARTMENT_ID IN (90,30); 
    declare continue handler for not found 
     set no_more_rows1 = TRUE;   
    open cursor1; 
    LOOP1: loop 
     fetch cursor1 
     into v_col1; 
     SELECT v_col1 ; 
     if no_more_rows1 then 
      close cursor1; 
      leave LOOP1; 
     end if; 
     BLOCK2: begin 
      declare v_col2 int; 
      declare no_more_rows2 boolean DEFAULT FALSE; 
      declare cursor2 cursor for 
       select EMPLOYEE_ID 
       from EMP 
       where DEPARTMENT_ID = v_col1; 
      declare continue handler for not found 
       set no_more_rows2 = TRUE; 
      open cursor2; 
      LOOP2: loop 
       fetch cursor2 
       into v_col2; 
       SELECT v_col2; 
       if no_more_rows2 then 
        close cursor2; 
        leave LOOP2; 
       end if; 
      end loop LOOP2; 
     end BLOCK2; 
    end loop LOOP1; 
    end BLOCK1;