I want to use a dynamic schema name in the from clause but its not working.

Question

DECLARE
     vblQueryName VARCHAR2(20);
     vblSchemaName VARCHAR2(20);
BEGIN
     SELECT CurrentSchemaName INTO vblSchemaName FROM HR_989_SCHEMA;
     vblQueryName:='060_525_020';
     INSERT /*+ APPEND(HP_ELIGIBILITIES,4) */ INTO HP_ELIGIBILITIES
          LVL1ID,
          LVL1Desc,
          LVL2ID,
          LVL2Desc,
          LVL3ID,
          LVL3Desc,
          LVL4ID,
          LVL4Desc
     SELECT /*+ PARALLEL(a,4) */
          LVL1ID,
          LVL1Desc,
          LVL2ID,
          LVL2Desc,
          LVL3ID,
          LVL3Desc,
          LVL4ID,
          LVL4Desc
     FROM
     bold     vblSchemaName.HP_ELIGIBILITIES a
     WHERE
          UPPER(LVL2ID) = 'XX' ;
     COMMIT;
DBMS_OUTPUT.PUT_LINE( 'Query Executed: ' || vblqueryName);
INSERT INTO HP_QUERYEXECLOG(QueryName) VALUES(vblQueryName);
EXCEPTION WHEN NO_DATA_FOUND THEN NULL;
END;
I want to create a rules table so that the schema name in front of the table name in the from clause can be controlled by a separate table that is maintained but its not working . Help and your valuable inputs needed for this issue

Answer 1

I want to use a dynamic schema name in the from clauseyou can alternatively set the current schema as e.g. in:
declare
   vblqueryname    varchar2 (20);
   vblschemaname   varchar2 (20);
begin
   select currentschemaname into vblschemaname from hr_989_schema;
   vblqueryname := '060_525_020';
   execute immediate 'alter session set current_schema=' || vblschemaname;
   insert /*+ APPEND(HP_ELIGIBILITIES,4) */
         into hp_eligibilities (lvl1id,
                                lvl1desc,
                                lvl2id,
                                lvl2desc,
                                lvl3id,
                                lvl3desc,
                                lvl4id,
                                lvl4desc
      select /*+ PARALLEL(a,4) */
            lvl1id,
             lvl1desc,
             lvl2id,
             lvl2desc,
             lvl3id,
             lvl3desc,
             lvl4id,
             lvl4desc
        from hp_eligibilities a
       where upper (lvl2id) = 'XX';
   commit;
   dbms_output.put_line ('Query Executed: ' || vblqueryname);
   insert into hp_queryexeclog (queryname)
   values (vblqueryname);
exception
   when no_data_found
   then
      null;
end;