fetch table name from a column for from clause

Question

I have a view t with me which has a column for table name and another column which has where clause condition.

    id| name|table_in| where_clause

    1 | S         


        

Answer 1

@Akshay,

Please find the code below for your reference.

Create or replace procedure create_cursor is
l_statement varchar2(32767);
cursor v_records is
  select * from t;
begin
for temp in v_records
loop
  l_statement := 'INSERT INTO myTable (id, name) select '||temp.id||','
   ||temp.name|| ' from ' || temp.table1 
   || ' where ' || temp.where_clause;

  execute immediate l_statement;
  end loop;
end;
/

Answer 2

You need dynamic sql to do this:

CREATE OR REPLACE PROCEDURE create_cursor
IS
  l_statement VARCHAR2(32767);
  CURSOR v_records
  IS
    SELECT * FROM t;
BEGIN
  FOR temp IN v_records
  LOOP
    l_statement := 'INSERT INTO myTable (id, name)
          select id, name from ' || temp.table || 
          ' where ' || temp.where_clause;
    EXECUTE immediate l_statement;
  END LOOP;
END;
/