Oracle使用存储过程返回查询游标

Posted 2022-03-15 fooobabar

如果报表逻辑非常复杂的话， 可以把报表逻辑放到存储过程里，加工一个全局临时表。
前端查询的时候只查询临时表即可。只是第一次查询需要忍受加工的时间。

 

--创建存储过程，返回SYS_REFCURSOR 
CREATE OR REPLACE PROCEDURE P_GET_AGENT(V_AGENT_CATE IN VARCHAR2,
                                        V_PAGE       IN INTEGER,
                                        O_CURSOR     OUT SYS_REFCURSOR) IS
BEGIN
  INSERT INTO TMP_TAB_T_AGENT(AGENT_ID)
    SELECT AGENT_ID FROM T_AGENT TA WHERE TA.AGENT_CATE = V_AGENT_CATE;

  OPEN O_CURSOR FOR
    SELECT AGENT_ID
      FROM (SELECT ROWNUM AS RN, AGENT_ID
              FROM (SELECT AGENT_ID FROM TMP_TAB_T_AGENT ORDER BY AGENT_ID)
             WHERE ROWNUM < V_PAGE * 10)
     WHERE RN >= (V_PAGE - 1) * 10;
EXCEPTION
  WHEN OTHERS THEN
    DBMS_OUTPUT.PUT_LINE(‘wrong‘);
END;

--调用存储过程，
DECLARE
  V_CURSOR   SYS_REFCURSOR;
  V_AGENT_ID T_AGENT.AGENT_ID%TYPE;
BEGIN
  -- Call the procedure
  P_GET_AGENT(V_AGENT_CATE => ‘5‘, V_PAGE => 4, O_CURSOR => V_CURSOR);

  LOOP
    FETCH V_CURSOR
      INTO V_AGENT_ID;
    EXIT WHEN V_CURSOR%NOTFOUND;
    DBMS_OUTPUT.PUT_LINE(V_AGENT_ID);
  END LOOP;

  CLOSE V_CURSOR;
  COMMIT;
END;