Re: global temporary table --> invalid ROWID?

From: Oracle_Technet <oracle_technet_at_yahoo.com>
Date: 2 Oct 2003 23:30:41 -0700
Message-ID: <c3e04899.0310022230.799c3a82_at_posting.google.com>


Reason as per my understanding: java front end would be using connection pooling, and the session is not bound. so once the back end proc gives the output back to front end, and then the front end tries to access the blob stored in the global temp table, it will give error, as global temp table is session specific. (so rowid not found). Same type of errors would be encountered with ref cursors based on global temp tables.
So, don't use Global Temporary tables for returning resultsets to java front end.
Hope this helps.

JavaDeveloper_at_volcanomail.com (Corrine) wrote in message news:<54774824.0309290654.58fb3f16_at_posting.google.com>...
> Hi,
>
> I am creating a global temporary table that is session-specific. I
> insert a BLOB into this table, and then select the BLOB from this
> table into a ResultSet. The ResultSet sees this BLOB object, and I am
> able to get the binary input stream from this blob. However, when I
> invoke InputStream.read(byte[]) on this input stream, I get the
> following exception:
>
> java.io.IOException: ORA-01410: invalid ROWID
> ORA-06512: at "SYS.DBMS_LOB", line 751
> ORA-06512: at line 1
>
>
> at oracle.jdbc.dbaccess.DBError.SQLToIOException(DBError.java:625)
>
> at oracle.jdbc.driver.OracleBlobInputStream.needBytes(OracleBlobInputStream.java:179)
>
> at oracle.jdbc.driver.OracleBufferedStream.read(OracleBufferedStream.java:113)
>
> at oracle.jdbc.driver.OracleBufferedStream.read(OracleBufferedStream.java:91)
> ...
>
> Just for clarity, here is basically the code I'm using:
>
> CallableStatement cstmt2 = db.prepareCall("commit");
> CallableStatement cstmt = db.prepareCall("create global temporary
> table temp_table (blobid NUMBER unique, blob_col BLOB) on commit
> preserve rows");
> cstmt.execute();
> cstmt.close();
> cstmt2.execute();
> CallableStatement cstmt1 = db.prepareCall("insert into temp_table
> values (1, empty_blob())");
> cstmt1.execute();
> cstmt1.close();
> cstmt2.execute();
> cstmt2.close();
>
> CallableStatement plsqlblock =
> db.prepareCall(stringThatFillsInEmptyBlobInTempTable);
> plsqlblock.execute();
> plsqlblock.close();
>
> PreparedStatement pstmt1 = db.prepareStatement("select blob_col from
> temp_table where blobid = 1");
> ResultSet rset = pstmt1.executeQuery();
> BLOB bl;
> if (rset.next())
> {
> System.out.println("success."); //<--- This prints out.
> bl = ((OracleResultSet)rset).getBLOB(1);
> }
> pstmt1.close();
>
> InputStream bis = bl.getBinaryStream();
> int numBytes = 0;
> byte[] theBytes = new byte[appropriateLength];
> numBytes = bis.read(theBytes); ///*******EXCEPTION HAPPENS
> HERE!!!!
>
>
> I would also like to mention that when I change temp_table to be just
> a regular table, everything works correctly.
>
> What's the problem, and how do I fix it?
>
> Thanks,
>
> Corrine
Received on Fri Oct 03 2003 - 08:30:41 CEST

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