Dynamic cursor Oracle | 易学教程

问题

I want to create a dynamic cursor, but my code does not bring me the correct data. What am I doing wrong?

DECLARE
 VAR1 VARCHAR2(500);
 CURSOR CUR1 IS
  SELECT T.COL1 FROM TABLE1 T WHERE T.COL1 IN (VAR1);

 BEGIN
  VAR1 := q'['V1','V2']';
  FOR REG IN CUR1 LOOP
   DBMS_OUTPUT.PUT_LINE(REG.COL1);
  END LOOP;
END;

回答1:

In short, IN clause doesn't support bind variables.. It supports for only value,in the way you used.. You need to specify it like IN (var1, var2);

Without knowing you , you have used bind variables. One workaround is use REFCURSOR By forming a query string dynamically.

DECLARE
 VAR1 VARCHAR2(500);
 CUR1 SYs_REFCURSOR;
 QUERY_STRING VARCHAR2(2000) := 'SELECT T.COL1 FROM TABLE1 T WHERE T.COL1 IN';

 MYREC IS RECORD 
 (
   COL1 VARCHAR(1000);
 );

 myrecord MYREC;

 BEGIN
  VAR1 := q'['V1','V2']';
  QUERY_STRING:= QUERY_STRING||'('||VAR1||')';

  OPEN CUR1 FOR QUERy_STRING;

    LOOP
      FETCH CUR1 INTO myrecord;
      DBMS_OUTPUT.PUT_LINE(myrecord.COL1);
      EXIT WHEN v_my_ref_cursor%NOTFOUND;
        ..
      -- your processing
    END LOOP;

  CLOSE CUR1;

END;

One of my other answer also has other way using collections, for bigger IN clause list.

回答2:

--I USED A TABLE IN OUR DB ORACLE 11G R2 --there are some syntax issues above that I corrected --I moved the QUERY_STRING after the BEGIN and added output

DECLARE
 VAR1 VARCHAR2(500);
 CUR1 SYS_REFCURSOR;
 QUERY_STRING VARCHAR2(2000);

 TYPE MYREC IS RECORD 
 (
   WO_NBR VARCHAR(1000)
 );

 myrecord MYREC;

BEGIN
  VAR1 := q'['45466','45432']';
  QUERY_STRING := 'SELECT T.WO_NBR FROM WO_SCHED T WHERE T.WO_NBR IN  ('||VAR1||')';
  DBMS_OUTPUT.PUT_LINE(VAR1);
  DBMS_OUTPUT.PUT_LINE(QUERY_STRING);

  OPEN CUR1 FOR QUERY_STRING;

    LOOP
      FETCH CUR1 INTO myrecord;
      DBMS_OUTPUT.PUT_LINE(myrecord.WO_NBR);
      EXIT WHEN CUR1%NOTFOUND;

      -- your processing
    END LOOP;

  CLOSE CUR1;

END;

来源：https://stackoverflow.com/questions/26046482/dynamic-cursor-oracle

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Oracle

plsql

dynamic-sql