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Cursor using Dynamic SQL

Posted on 2002-03-28
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Last Modified: 2012-06-27
Hi,

It is not possible to create a cursor using Dynamic SQL in Oracle (ver 8.1.5). When I try to do this, I get the following error message.

PLS-00455: cursor cannot be used in dynamic SQL OPEN statement

Is there any work around for this?

Regards
SV1040
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Question by:sv1040
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DrSQL earned 200 total points
ID: 6902511
sv1040,
    I have two answers.  First, are you using the RETURNS clause, because that isn't how you get rows fetched into your program.  The RETURNS is for getting the results of a delete, update, or other sql command that returns a count or value (like a function).  Since you're OPENning the cursor, it knows it's a select and can't have a return.  If you want rowcount, you'll have to handle that separately from the OPEN.  The rest of my answer may be painfully obvious, but just in case...

  For Dynamic SQL (open-for or DBMS_SQL) you use a reference cursor or a number and apply it in the open for or DBMS_SQL.OPEN.  Here's some examples:

OPEN/FOR:

DECLARE
   TYPE EmpCurTyp IS REF CURSOR;  -- define weak REF CURSOR type
   emp_cv   EmpCurTyp;  -- declare cursor variable
   my_ename VARCHAR2(15);
   my_sal   NUMBER := 1000;
BEGIN
   OPEN emp_cv FOR  -- open cursor variable
      'SELECT ename, sal FROM emp WHERE sal > :s' USING my_sal;
   ...
END;


DBMS_SQL:

Consider a table MULTI_TAB defined as:

create table multi_tab (num number,
                        dat1 date,
                        var varchar2(24),
                        dat2 date)


To select everything from this table and move it into four PL/SQL tables, you could use the following simple program:

declare
  c       number;
  d       number;
  n_tab  dbms_sql.Number_Table;
  d_tab1 dbms_sql.Date_Table;
  v_tab  dbms_sql.Varchar2_Table;
  d_tab2 dbms_sql.Date_Table;
  indx number := 10;
begin

  c := dbms_sql.open_cursor;
  dbms_sql.parse(c, 'select * from multi_tab order by 1', dbms_sql);

  dbms_sql.define_array(c, 1, n_tab,  5, indx);
  dbms_sql.define_array(c, 2, d_tab1, 5, indx);
  dbms_sql.define_array(c, 3, v_tab,  5, indx);
  dbms_sql.define_array(c, 4, d_tab2, 5, indx);

  d := dbms_sql.execute(c);

  loop
    d := dbms_sql.fetch_rows(c);

    dbms_sql.column_value(c, 1, n_tab);
    dbms_sql.column_value(c, 2, d_tab1);
    dbms_sql.column_value(c, 3, v_tab);
    dbms_sql.column_value(c, 4, d_tab2);
 
    exit when d != 5;
  end loop;

  dbms_sql.close_cursor(c);


Good luck!
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by:Mindphaser
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Expert Comment

by:DanRollins
ID: 7082297
Recommended disposition:

    Accept DrSQL's comment(s) as an answer.

DanRollins -- EE database cleanup volunteer
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by:Mindphaser
ID: 7096029
Force accepted

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