Oracle ref cursor和sys_refcursor
1. 自定义 ref cursor 和 sys_refcursor;
2. sys_refcursor 做为参数传递结果集;
3. ref cursor 做为参数传递结果集;
1. 自定义 ref cursor 和 sys_refcursor:
declare
type df_ref is ref cursor; --定义 ref cursor
rf df_ref; --声明 rf 是df_ref
ename varchar2(30);
begin
open rf for 'select ename from emp';
loop
fetch rf into ename;
dbms_output.put_line(ename);
exit when rf%notfound;
end loop;
close rf;
end;
/
sys_refcursor 不需要声明可以直接使用:
declare
reft sys_refcursor;
begin
open reft for 'select * from emp';
close reft;
end;
sqlplus 中可以使用refcursor:
OPS$SYWU@sydb%11GR2>variable r refcursor;
OPS$SYWU@sydb%11GR2>exec open :r for 'select * from emp';
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
OPS$SYWU@sydb%11GR2>print :r;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7369 SMITH CLERK 7902 17-DEC-80 800 20
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7839 KING PRESIDENT 17-NOV-81 5000 10
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7900 JAMES CLERK 7698 03-DEC-81 950 30
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7934 MILLER CLERK 7782 23-JAN-82 1300 10
14 rows selected.
2. sys_refcursor 做为参数传递结果集:
create or replace procedure pro_getEmp(ref_rs out sys_refcursor)
is
begin
open ref_rs for 'select ename,empno from emp';
---不能在这里关闭
end;
/
调用结果集:
declare
refc sys_refcursor;
ename varchar2(30);
empno number;
begin
pro_getEmp(ref_rs=>refc);
loop
fetch refc into ename,empno;
dbms_output.put_line(ename||''||empno);
exit when refc%notfound;
end loop;
end;
/
3. ref cursor 做为参数传递结果集:
在包头定义 ref cursor:
create or replace package pk_cur
as
type df_cursor is ref cursor;
function fun_emp return df_cursor;
end;
/
create or replace package body pk_cur
is
function fun_emp return df_cursor
is
fn_cursor df_cursor;
begin
open fn_cursor for 'select * from emp';
return fn_cursor;
end;
end;
/
OPS$SYWU@sydb%11GR2> select pk_cur.fun_emp from dual;
FUN_EMP
--------------------
CURSOR STATEMENT : 1
CURSOR STATEMENT : 1
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7369 SMITH CLERK 7902 17-DEC-80 800 20
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7839 KING PRESIDENT 17-NOV-81 5000 10
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7900 JAMES CLERK 7698 03-DEC-81 950 30
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7934 MILLER CLERK 7782 23-JAN-82 1300 10
14 rows selected.