exit SYS_REFCURSOR when we do not know the structure of slider

If I have a variable of type 'SYS_REFCURSOR.
This cursor is passed to various procedures that open various recordset for this cursor, with different number of columns in the cursor.
How do all the output cursor columns?

1. maybe java will have metadata for cursor information and can produce the result set of the cursor. If so, then it's ok to choose this solution. VbScript is also ok, if it helps.

2. perhaps we can create temporary table based on the cursor. And table objects have meta-data in oracle system tables, I can output all the data slider.

3 perhaps I can use the so-called technique of try-catch to help sort clauses. For example

Try
  fetch cur1 into varchar2_var1, .., varchar2_var5
catch (if error)
      try
          fetch cur1 into varchar2_var1, .., varchar2_var4
...
Till we know how many fields there are.
somehow this way to go next

4. maybe execute immediate can help somehow.

If you're not in 11g and you have at least a few options of structures that you want to try and extract, you can make use of the exception rowtype_mismatch in intercepting and trying to get in a different structure until you find, start by nesting PL/SQL exception... the end. blocks.

You won't lose lines if you try to go get in the wrong structure.

In the example below, I'm trying to get in a guy with 2 columns and it fails then I try again against a 3-column type.

Note that the incompatibility of implicit conversions column type to lift other exceptions such as ORA-06504 or ORA-01722 for example.

Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.4.0
Connected as fsitja

SQL> set serveroutput on
SQL>
SQL> DECLARE
  2    cur SYS_REFCURSOR;
  3    TYPE t_rec1 IS RECORD(
  4      col1 NUMBER,
  5      col2 VARCHAR2(100));
  6    v_rec1 t_rec1;
  7    TYPE t_rec2 IS RECORD(
  8      col3 NUMBER,
  9      col4 VARCHAR2(100),
 10      col5 VARCHAR2(100));
 11    v_rec2 t_rec2;
 12  BEGIN
 13    OPEN cur FOR
 14      SELECT 1 col3, 'a' col4, 'b' col5 FROM dual;
 15    FETCH cur
 16      INTO v_rec1;
 17    dbms_output.put_line('REC1.COL1: ' || v_rec1.col1);
 18    dbms_output.put_line('REC1.COL2: ' || v_rec1.col2);
 19  EXCEPTION
 20    WHEN rowtype_mismatch THEN
 21      FETCH cur
 22        INTO v_rec2;
 23      dbms_output.put_line('REC2.COL3: ' || v_rec2.col3);
 24      dbms_output.put_line('REC2.COL4: ' || v_rec2.col4);
 25      dbms_output.put_line('REC2.COL5: ' || v_rec2.col5);
 26  END;
 27  /

REC2.COL3: 1
REC2.COL4: a
REC2.COL5: b

PL/SQL procedure successfully completed

SQL>

Tags: Database

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