包括强类型、若类型、传递 ref cursor 参数等。
| Oracle Ref Cursors |
| Version 10.2 |
| |
| Strongly Typed |
| Note: A REF CURSOR that specifies a specific return type. |
| Package Header |
CREATE OR REPLACE PACKAGE strongly_typed IS
TYPE return_cur IS REF CURSOR RETURN all_tables%ROWTYPE;
PROCEDURE child(p_return_rec OUT return_cur);
PROCEDURE parent(p_NumRecs PLS_INTEGER); |
END strongly_typed;
/ |
| Package Body |
CREATE OR REPLACE PACKAGE BODY strongly_typed IS
PROCEDURE child(p_return_rec OUT return_cur) IS
BEGIN
OPEN p_return_rec FOR
SELECT * FROM all_tables;
END child; |
| --================================================== |
PROCEDURE parent (p_NumRecs PLS_INTEGER) IS
p_retcur return_cur;
at_rec all_tables%ROWTYPE;
BEGIN
child(p_retcur);
FOR i IN 1 .. p_NumRecs
LOOP
FETCH p_retcur
INTO at_rec;
dbms_output.put_line(at_rec.table_name ||
' - ' || at_rec.tablespace_name ||
' - ' || TO_CHAR(at_rec.initial_extent) ||
' - ' || TO_CHAR(at_rec.next_extent));
END LOOP;
END parent; |
END strongly_typed;
/ |
| To Run The Demo |
set serveroutput on
exec strongly_typed.parent(1)
exec strongly_typed.parent(8) |
| |
| Weakly Typed |
| Note: A REF CURSOR that does not specify the return type such as SYS_REFCURSOR. |
| Child Procedure |
CREATE OR REPLACE PROCEDURE child (
p_NumRecs IN PLS_INTEGER,
p_return_cur OUT SYS_REFCURSOR)
IS
BEGIN
OPEN p_return_cur FOR
'SELECT * FROM all_tables WHERE rownum <= ' || p_NumRecs ;
END child;
/ |
| Parent Procedure |
CREATE OR REPLACE PROCEDURE parent (pNumRecs VARCHAR2) IS
p_retcur SYS_REFCURSOR;
at_rec all_tables%ROWTYPE;
BEGIN
child(pNumRecs, p_retcur);
FOR i IN 1 .. pNumRecs
LOOP
FETCH p_retcur
INTO at_rec;
dbms_output.put_line(at_rec.table_name ||
' - ' || at_rec.tablespace_name ||
' - ' || TO_CHAR(at_rec.initial_extent) ||
' - ' || TO_CHAR(at_rec.next_extent));
END LOOP;
END parent;
/ |
| To Run The Demo |
set serveroutput on
exec parent(1)
exec parent(17) |
| |
| Passing Ref Cursors |
| Ref Cursor Passing Demo |
CREATE TABLE employees (
empid NUMBER(5),
empname VARCHAR2(30));
INSERT INTO employees (empid, empname) VALUES (1, 'Dan Morgan');
INSERT INTO employees (empid, empname) VALUES (2, 'Jack Cline');
INSERT INTO employees (empid, empname) VALUES (3, 'Caleb Small');
COMMIT;
CREATE OR REPLACE PROCEDURE pass_ref_cur(p_cursor SYS_REFCURSOR) IS
TYPE array_t IS TABLE OF VARCHAR2(4000)
INDEX BY BINARY_INTEGER;
rec_array array_t;
BEGIN
FETCH p_cursor BULK COLLECT INTO rec_array;
FOR i IN rec_array.FIRST .. rec_array.LAST
LOOP
dbms_output.put_line(rec_array(i));
END LOOP;
END pass_ref_cur;
/ |
set serveroutput on
DECLARE
rec_array SYS_REFCURSOR;
BEGIN
OPEN rec_array FOR
'SELECT empname FROM employees';
pass_ref_cur(rec_array);
CLOSE rec_array;
END;
/
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