Please help me on how to pass date condition Dynamically.

Question

Hi Experts,
I have the following control table.
ID S_OWNER  SOURCE_TABLE     A_OWNER    ARC_TABLE             CONDITION_COLUMN     PERIOD_VALUE   PERIOD_UNIT
1    wedb     Auction_table    wedb     Arc_Auction_table     Auction_date            15               Days
1    wedb     Sales_table      wedb     ArcSales_table             Sales_date            180              Days
1    hr       Accounts_table   hr       Arc_Accounts_table     Account_date             2             Years
2    concor   Concur_table     con      Arc_Concur_table        Last_update_date        4               MonthsLike this 1000 entries are there in the control_table.
I want to pass all the columns from my control table dynamically.
I am able to pass all the columns dynamically,except the PERIOD_VALUE.
I have stucked up how to implement this condition.
My aim is to get the data which is <= sysdate-PERIOD_VALUES based on PERIOD_UNIT.
For Example:
For Auction_date column I want to get the data which 15 days old.
For Sales_date column I want to get the data which 180 days old.
For Account_date column I want to get the data which 2 yers old.
For Last_update_date column I want to get the data which 4 months old.
The conditions something like this.
condition_column<=(sysdate-15 days)
condition_column<=(sysdate-180 days)
condition_column<=(sysdate-2 years)
condition_column<=(sysdate-4 months)This is my procedure.
CREATE OR REPLACE PROCEDURE WEDB.procedure_control(
   P_ID IN NUMBER)
IS
   CURSOR C
   IS
        SELECT ID,S_OWNER,SOURCE_TABLE,A_OWNER,ARC_TABLE,CONDITION_COLUMN,PERIOD_VALUE,PERIOD_UNIT
          FROM wedb.CONTROL
         WHERE ID = p_id
      ORDER BY ID, SOURCE_TABLE;
      rec C%ROWTYPE;
BEGIN
   FOR I IN C
   LOOP
    EXECUTE IMMEDIATE
               'INSERT INTO '
            || rec.A_OWNER
            || '.'
            || rec.ARC_TABLE
            || '(SELECT * FROM '
            || rec.S_OWNER
            || '.'
            || rec.SOURCE_TABLE
            || ' WHERE '
            || rec.CONDITION_COLUMN
            || '<=I want to pass dynamic condition'
            || ')';
         EXECUTE IMMEDIATE
               'DELETE FROM '
            || rec.S_OWNER
            || '.'
            || rec.SOURCE_TABLE
            || ' WHERE '
            || rec.CONDITION_COLUMN
            || '<= I want to pass dynamic condition'
            || '';
      COMMIT;
   END LOOP;
EXCEPTION
   WHEN OTHERS
   THEN
      ROLLBACK;
      DBMS_OUTPUT.PUT_LINE (
         'An error was encountered - ' || SQLCODE || ' -ERROR- ' || SQLERRM);
END procedure_control;
/Please help me how to implement this.
Thanks in advance.

Answer 1

I have added ||')' paranthasis for each CASE stament to avoiid the error.
Now I am getting the below error
ORA-00903: invalid table name
ORA-06512: at line 42
I am using below code.
Please find my below code.
DECLARE
   stmt   LONG;
   CURSOR C
   IS
        SELECT GROUP_ID,
               SOURCE_TABLE_OWNER_NAME,
               SOURCE_TABLE_NAME,
               ARCHIVE_TABLE_OWNER_NAME,
               ARCHIVE_TABLE_NAME,
               CONDITION_COLUMN_NAME,
               RETENTION_VALUE,
               RETENTION_UNIT,
               FLAG
          FROM APPS_GLOBAL.control_table1
         WHERE GROUP_ID = 1
      ORDER BY GROUP_ID, source_table_name;
   rec    c%ROWTYPE;
BEGIN
   FOR rec IN C
   LOOP
stmt := 'INSERT INTO '
         || rec.ARCHIVE_TABLE_OWNER_NAME
         || '.'
         || rec.ARCHIVE_TABLE_NAME
         || '(SELECT * FROM '
         || rec.SOURCE_TABLE_OWNER_NAME
         || '.'
         || rec.SOURCE_TABLE_NAME
         || ' WHERE '
         || rec.CONDITION_COLUMN_NAME
         || '<=';
CASE LOWER (rec.RETENTION_UNIT)
    WHEN 'd'
    THEN
     stmt:= stmt||'sysdate -'||rec.RETENTION_VALUE||')';
     ELSE
     stmt := stmt||'add_months(sysdate,'|| rec.RETENTION_VALUE||'*-12)'||')';
END CASE;
execute immediate stmt;
   END LOOP;
   COMMIT;
END;
/The values for the field RETENTION_UNIT in my control_table1 are D and Y.
Before making the date comparison condition it was working fine.
If I made it as dynamic why I am getting the error.
If I use condition as below it's working fine.
EXECUTE IMMEDIATE
               'INSERT INTO '
            || I.ARCHIVE_TABLE_OWNER_NAME
            || '.'
            || I.ARCHIVE_TABLE_NAME
            || '(SELECT * FROM '
            || I.SOURCE_TABLE_OWNER_NAME
            || '.'
            || I.SOURCE_TABLE_NAME
            || ' WHERE '
            || I.CONDITION_COLUMN_NAME
            || '<=ADD_MONTHS(SYSDATE,-24)'
            || ')';Please help me .
Thanks.