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POOracle/OJDBC BLOB update problem on non-existing rows?
 

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  1. POOracle/OJDBC BLOB update problem on non-existing rows?
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    <p>I ran into very peculiar problem with BLOBs in Oracle. I'm using OracleXE 10g (10.2.0.1.0 version of database), and tried it with ojdbc14_g drivers version 10.2.0.1.0, 10.2.0.4.0 and 10.2.0.5.0. The same thing happens always. I think it's something with the drivers based on what I read so far on the various forums, but I'm not sure... And this is the problem:</p> <p>I have this piece of code, that prepares statement to update two blobs, which are actually zip archives:</p> <pre><code>File fRst = new File("archive1.zip"); File fPro = new File("archive2.zip"); //... statement = "UPDATE CURR_STATE" + " SET ZIP_RST=?, ZIP_PRO=?" + " WHERE SERIAL_NUMBER=" + "'" + serialNo + "'" + " AND" + " YEAR_MONTH=" + "'" + yearMonth + "'"; pstmt = this.connection.prepareStatement(statement); FileInputStream isR = new FileInputStream(fRst); FileInputStream isP = new FileInputStream(fPro); pstmt.setBinaryStream(1, isR, (int) fRst.length()); pstmt.setBinaryStream(2, isP, (int) fPro.length()); int no = pstmt.executeUpdate(); System.out.println("rows: " + no); this.connection.commit(); pstmt.close(); </code></pre> <p>I was testing the case of update where given record <strong>does not exist</strong> in the table. if these two zip files are smaller in size (like 2, 5 or 10KB), line:</p> <pre><code>int no = pstmt.executeUpdate(); </code></pre> <p>returns 0 rows updated, which is expected considering that row defined in WHERE clause does not exist. However, if zip files are a bit bigger (30, 40KB), <em>executeUpdate()</em> throws SQLException with various messages, like:</p> <pre><code>java.sql.SQLException: Io exception: Software caused connection abort: socket write error at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:145) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:190) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:363) at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:1142) at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1278) at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3415) at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3498) </code></pre> <p>or</p> <pre><code>java.sql.SQLException: No more data to read from socket </code></pre> <p>or</p> <pre><code>java.sql.SQLException: OALL8 is in an inconsistent state </code></pre> <p>These exceptions effectively kill the underlying socket connection, so it becomes unusable. Funny thing is, if the row <strong>exists</strong> in the table, everything works fine, update executes with no problem, returning 1 as number of updated rows.</p> <p>I wonder if anybody has already encountered this strange behaviour, and if there's any bypass for this? (except the obvious one - to check if the row exists :) )</p> <p>Thanks.</p>
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    1. COWhat JKD version do you use?
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    2. COI use jdk 1.6.0._21
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    3. COWith JDK 1.6, you're supposed to use ojdbc6.jar (instead of ojdbc14.jar).
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