sql - What is the best way to search the Long datatype within an Oracle database?

Question

I am working with an Oracle database that stores HTML as a Long datatype. I would like to query the database to search for a specific string within the HTML data stored in the Long.

I tried, "select * from TABLE where COLUMN like '%form%'". This causes the following Oracle error because "like" is not supported for Long datatypes.

ORA-00932: inconsistent datatypes: expected NUMBER got LONG

Answer 1

You can use this example without using temp table:

DECLARE

  l_var VARCHAR2(32767); -- max length

BEGIN

FOR rec IN (SELECT ID, LONG_COLUMN FROM TABLE_WITH_LONG_COLUMN) LOOP
  l_var := rec.LONG_COLUMN;
  IF l_var LIKE '%350%' THEN -- is there '350' string?
    dbms_output.put_line('ID:' || rec.ID || ' COLUMN:' || rec.LONG_COLUMN);
  END IF;
END LOOP;

END;

Of course there is a problem if LONG has more than 32K characters.