6 Replies Latest reply: Apr 14, 2006 9:57 AM by sgalaxy RSS

    Comparing two values of LONG datatype

    sgalaxy
      Hi ,
      I have a comparison between values of LONG datatype.This comparison should give equality of the two values (i have checked it). However , always gives inequality.
      I use for this the equal sign (=).
      In the situation , I construct - using PL/SQL code - the definition of the NOT NULL constraint (as it is appeared in Enterprise Manager Console , TOAD , PLSQLDEVELEOPER e.t.c.)
      for example - "BARCODE" IS NOT NULL .
      Then I compare this string (taking the value of the search_condition which is a column in user_constraints view) with the one appears during the database error (NOT NULL) occurs...

      What may be the problem for the inequality of the two values...?

      Thanks , Simon
        • 1. Re: Comparing two values of LONG datatype
          496898
          Hi

          Use DBMS_LOB.COMPARE function.

          Ott Karesz
          http://www.trendo-kft.hu
          • 2. Re: Comparing two values of LONG datatype
            sgalaxy
            Hi ottkaresz ,
            I opened the b14258.pdf (PL/SQL Packages and Types Reference) in which the DBMS_LOB package is described.
            But in page 969 on this document -overview segment - it says that this package reads and modifies BLOB,CLOB,NCLOB datatype.
            Also in pages 986-987 where the COMPARE function is described , this function takes as arguments only BLOB , CLOB , BFILE - there is not reference to LONG datatype!!!!

            Should I first convert the LONG datatypes to (C/N)LOB BEFOREHAND I DO THE COMPARISON..., or what else should I do?

            Something else...
            the url http://www.trendo-kft.hu directs to a site , the language of which , is unknown for me.
            Is there the capability to interpret it in English...!

            Thanks , a lot
            Simon
            • 3. Re: Comparing two values of LONG datatype
              496898
              Hi

              Sorry for misunderstanding you.
              Use the TO_LOB function to convert the long to lob:
              http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14200/functions185.htm#i79464

              Sorry for the language restriction of my web page but this is only the first version :-)

              Ott Karesz
              http://www.trendo-kft.hu
              • 4. Re: Comparing two values of LONG datatype
                sgalaxy
                I think I cannot use it because as the link you sent me says
                '....You can apply this function only to a LONG or LONG RAW column, and only in the select list of a subquery in an INSERT statement.'

                But , I want to compare to LONG datatype values. One value is within the column SEARCH_CONDITION of user_constraints view and the other is a value (string) which i construct according to the db error (not null constraint) which raises....

                Thanks , anyway ,
                Simon
                • 5. Re: Comparing two values of LONG datatype
                  496898
                  Hi

                  And if you would load the long data into a temporary tables converting them to lob, and compare them as lob?

                  Ott Karesz
                  http://www.trendo-kft.hu
                  • 6. Re: Comparing two values of LONG datatype
                    sgalaxy
                    This is a big job!!!!
                    Every time a new constraint is added in user_constraints this must be inserted in the temporary table ....
                    I think it is not worth ....

                    Simon