Creating cursor using Execute immediate

Question

I am trying to create one cursor using a for loop, but I am not able to do so, could you please help me with the approach to get it done.
Here is the scenario:
I have one table table_1,it contains 2 columns source_query , target_query.
source_query and target_query are Select statements like source_query is Select name, age , valid from customer where customer_id=123456;
I fetched the data from these columns into 2 strings
select source_query into source_data from table_1;
select target_query into target_data from table_1;
Now out of these 2 I want to create 2 cursors, so that I can compare the column values one by one ( I am not using the  source minus target approach because of difference in the data type).
I have to individually check the values.
So here are the cursors:
For source_data_value in ( EXECUTE immediate source_data)
LOOP
For target_data_value in (EXECUTE IMMEDIATE target_data)
LOOP
<executable statements>;
END LOOP;
END LOOP;
But the cursor creation is failing in the procedure.
Please let me know if it is possible to create a cursor using the execute immediate , if not what approach I should use other than this?

Answer 1

Why exactly you are doing this inside a procedure. You can take the SQL's out and write a simple query to retrieve the data. Anyways, to work it out in a procedure, I can think of the below solution. I am trying to do away with Execute Immediate and use REF cursor. Please note that this is untested and just a try to present a possible solution which can be changed to implement your original requirement. I haven't done anything sort of this before, so if this approach doesn't approach, kindly ignore
DECLARE
   TYPE TempTyp IS REF CURSOR;
   temp_cv   TempTyp;
  temp_cv_2 Temptyp;
   emp_rec  emp%ROWTYPE;
   source_data VARCHAR2(200);
     target_data  VARCHAR2(200);
   BEGIN
   source_data:= 'SELECT * FROM source tablej';
   target_Date :='select * from target table';
   OPEN temp_cv FOR source_data;
   LOOP
      FETCH temp_cv INTO emp_rec;
      EXIT WHEN emp_cv%NOTFOUND;
        OPEN   temp_cv_2 FOR target_data;
          FETCH Temp_cv_2 into  emp_rec  emp%ROWTYPE
               loop
                    < And then your comparisons here >
     END LOOP:
     CLOST TEMP_CV_2;
   END LOOP;
   CLOSE temp_cv;
END;
Ishan