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几十个实用的PL/SQL(3)

答案:
第三阶段

Q.使用REF游标显示“EMP”表中的值。

A.

DECLARE

       TYPE emprectyp IS RECORD

       (

         EMPNO  emp.empno%TYPE,        

         ENAME  emp.ename%TYPE,

         JOB    emp.job%TYPE,

         MGR    emp.mgr%TYPE,    

         HIREDATE emp.hiredate%TYPE,

         SAL      emp.sal%TYPE,

         COMM     emp.comm%TYPE,

         DEPTNO   emp.deptno%TYPE

       );

       TYPE emp_cursor IS REF CURSOR RETURN emp%ROWTYPE;

       vemp_cur EMP_CURSOR;

       vemp_rec EMPRECTYP;

BEGIN

       OPEN vemp_cur FOR SELECT * FROM emp;

       LOOP

              FETCH vemp_cur INTO vemp_rec;

              EXIT WHEN vemp_cur%NOTFOUND;

              DBMS_OUTPUT.PUT(vemp_rec.empno||'  '||vemp_rec.ename||' '||vemp_rec.job);

              DBMS_OUTPUT.PUT(vemp_rec.mgr||'  '||vemp_rec.hiredate||' '||vemp_rec.sal);

              DBMS_OUTPUT.PUT_line(vemp_rec.comm||'  '||vemp_rec.deptno);

       END LOOP;

       CLOSE vemp_cur;

END;

/

Q.从“EMP”中获得值送到PL/SQL表,将PL/SQL表中的薪水值增加500,并向用户显示增加的薪水及其他详细信息。

A.

DECLARE

       TYPE emprec IS RECORD

       (

         EMPNO  emp.empno%TYPE,        

         ENAME  emp.ename%TYPE,

         JOB    emp.job%TYPE,

         MGR    emp.mgr%TYPE,    

         HIREDATE emp.hiredate%TYPE,

         SAL      emp.sal%TYPE,

         COMM     emp.comm%TYPE,

         DEPTNO   emp.deptno%TYPE

       );

 

       i BINARY_INTEGER:=1;

 

       TYPE emp_tab IS TABLE OF EMPREC INDEX BY binary_integer;

       vemp EMP_TAB;

 

       CURSOR c1 IS SELECT * FROM emp;

BEGIN

       FOR x IN c1

       LOOP

              vemp(i).empno:=x.empno;

              vemp(i).ename:=x.ename;

              vemp(i).job:=x.job;

              vemp(i).mgr:=x.mgr;

              vemp(i).hiredate:=x.hiredate;

              vemp(i).sal:=x.sal+500;

              vemp(i).comm:=x.comm;

              vemp(i).deptno:=x.deptno;

              i:=i+1;

       END LOOP;

 

       FOR j IN 1..i-1

       LOOP

              DBMS_OUTPUT.PUT(vemp(j).empno||'  '||vemp(j).ename||' '||vemp(j).job);

              DBMS_OUTPUT.PUT(vemp(j).mgr||'  '||vemp(j).hiredate||' '||vemp(j).sal);

              DBMS_OUTPUT.PUT_line(vemp(j).comm||'  '||vemp(j).deptno);

             

       END LOOP;

END;

/

Q.一旦将值送到PL/SQL表后,尝试在PL/SQL表中插入新记录并且删除某些现有的记录。

A.

DECLARE

       TYPE emprec IS RECORD

       (

         EMPNO  emp.empno%TYPE,         

         ENAME  emp.ename%TYPE,

         JOB    emp.job%TYPE,

         MGR    emp.mgr%TYPE,    

         HIREDATE emp.hiredate%TYPE,

         SAL      emp.sal%TYPE,

         COMM     emp.comm%TYPE,

         DEPTNO   emp.deptno%TYPE

       );

 

       i BINARY_INTEGER:=1;

 

       TYPE emp_tab IS TABLE OF EMPREC INDEX BY binary_integer;

       vemp EMP_TAB;

 

       CURSOR c1 IS SELECT * FROM emp;

BEGIN

       FOR x IN c1

       LOOP

              vemp(i).empno:=x.empno;

              vemp(i).ename:=x.ename;

              vemp(i).job:=x.job;

              vemp(i).mgr:=x.mgr;

              vemp(i).hiredate:=x.hiredate;

              vemp(i).sal:=x.sal;

              vemp(i).comm:=x.comm;

              vemp(i).deptno:=x.deptno;

              i:=i+1;

       END LOOP;

--     FOR j IN 1..i-1

--   

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