oracle out ref 游标循环
oracle out ref cursor to a loop
如何将输出游标o_cur的'values'传递给下一个循环?
CREATE OR REPLACE PROCEDURE dyn_cursor (o_cur OUT SYS_REFCURSOR)
IS
script VARCHAR2 (4000);
BEGIN
script := 'select sysdate-1 notnow, sysdate today from dual union all select sysdate+1 notnow, sysdate today from dual';
OPEN o_cur FOR script;
-- the question is related to this block:
for i in o_cur
loop
DBMS_OUTPUT.PUT_LINE(i.notnow);
end loop;
-----------------------
END;
当 refcursor 是一个 OUT
变量时,FETCH
通常在过程外处理
CREATE OR REPLACE PROCEDURE dyn_cursor (o_cur OUT SYS_REFCURSOR)
IS
script VARCHAR2 (4000);
BEGIN
script := 'select sysdate-1 notnow, sysdate today from dual union all select sysdate+1 notnow, sysdate today from dual';
OPEN o_cur FOR script;
END;
/
SET SERVEROUTPUT ON
DECLARE
v_cur SYS_REFCURSOR;
v_notnow DATE;
v_today DATE;
BEGIN
dyn_cursor(v_cur);
LOOP
FETCH v_cur INTO
v_notnow,
v_today;
EXIT WHEN v_cur%notfound;
dbms_output.put_line(v_notnow);
END LOOP;
END;
/
02-10-18
04-10-18
PL/SQL procedure successfully completed.
这似乎是一个奇怪的结构。我会创建一个视图,您可以在不同的地方重复使用。
CREATE OR REPLACE VIEW VW_Times AS
SELECT sysdate-1 notnow, sysdate today FROM dual
UNION ALL
SELECT sysdate+1 notnow, sysdate today FROM dual;
和
CREATE OR REPLACE PROCEDURE OutputTime ()
IS
CURSOR o_cur IS
SELECT * FROM VW_Times;
BEGIN
FOR i IN o_cur
LOOP
DBMS_OUTPUT.PUT_LINE(i.notnow);
END LOOP;
END;
感谢 Kaushik Nayak 的 post,我找到了可接受的解决方案:
CREATE OR REPLACE PROCEDURE dyn_cursor (o_cur OUT SYS_REFCURSOR)
IS
script VARCHAR2 (4000);
type array is table of VARCHAR2(20) index by binary_integer;
l_datapoint1 array;
l_datapoint2 array;
BEGIN
script := 'select sysdate-1 notnow, sysdate today from dual union all select sysdate+1 notnow, sysdate today from dual';
OPEN o_cur FOR script;
LOOP
FETCH o_cur bulk collect into l_datapoint1, l_datapoint2;
for i in 1 .. l_datapoint1.count
loop
DBMS_OUTPUT.PUT_LINE( l_datapoint1(i) || ', ' || l_datapoint2(i) );
end loop;
exit when o_cur%notfound;
end loop;
close o_cur;
END;
如何将输出游标o_cur的'values'传递给下一个循环?
CREATE OR REPLACE PROCEDURE dyn_cursor (o_cur OUT SYS_REFCURSOR)
IS
script VARCHAR2 (4000);
BEGIN
script := 'select sysdate-1 notnow, sysdate today from dual union all select sysdate+1 notnow, sysdate today from dual';
OPEN o_cur FOR script;
-- the question is related to this block:
for i in o_cur
loop
DBMS_OUTPUT.PUT_LINE(i.notnow);
end loop;
-----------------------
END;
OUT
变量时,FETCH
通常在过程外处理
CREATE OR REPLACE PROCEDURE dyn_cursor (o_cur OUT SYS_REFCURSOR)
IS
script VARCHAR2 (4000);
BEGIN
script := 'select sysdate-1 notnow, sysdate today from dual union all select sysdate+1 notnow, sysdate today from dual';
OPEN o_cur FOR script;
END;
/
SET SERVEROUTPUT ON
DECLARE
v_cur SYS_REFCURSOR;
v_notnow DATE;
v_today DATE;
BEGIN
dyn_cursor(v_cur);
LOOP
FETCH v_cur INTO
v_notnow,
v_today;
EXIT WHEN v_cur%notfound;
dbms_output.put_line(v_notnow);
END LOOP;
END;
/
02-10-18
04-10-18
PL/SQL procedure successfully completed.
这似乎是一个奇怪的结构。我会创建一个视图,您可以在不同的地方重复使用。
CREATE OR REPLACE VIEW VW_Times AS
SELECT sysdate-1 notnow, sysdate today FROM dual
UNION ALL
SELECT sysdate+1 notnow, sysdate today FROM dual;
和
CREATE OR REPLACE PROCEDURE OutputTime ()
IS
CURSOR o_cur IS
SELECT * FROM VW_Times;
BEGIN
FOR i IN o_cur
LOOP
DBMS_OUTPUT.PUT_LINE(i.notnow);
END LOOP;
END;
感谢 Kaushik Nayak 的 post,我找到了可接受的解决方案:
CREATE OR REPLACE PROCEDURE dyn_cursor (o_cur OUT SYS_REFCURSOR)
IS
script VARCHAR2 (4000);
type array is table of VARCHAR2(20) index by binary_integer;
l_datapoint1 array;
l_datapoint2 array;
BEGIN
script := 'select sysdate-1 notnow, sysdate today from dual union all select sysdate+1 notnow, sysdate today from dual';
OPEN o_cur FOR script;
LOOP
FETCH o_cur bulk collect into l_datapoint1, l_datapoint2;
for i in 1 .. l_datapoint1.count
loop
DBMS_OUTPUT.PUT_LINE( l_datapoint1(i) || ', ' || l_datapoint2(i) );
end loop;
exit when o_cur%notfound;
end loop;
close o_cur;
END;