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From "Jean T. Anderson (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-500) Update/Select failure when BLOB/CLOB fields updated in several rows by PreparedStatement using setBinaryStream and setCharacterStream
Date Tue, 08 Nov 2005 20:58:21 GMT
    [ http://issues.apache.org/jira/browse/DERBY-500?page=comments#action_12357076 ] 

Jean T. Anderson commented on DERBY-500:
----------------------------------------

Committed Doc_JdbcImpl_paper.diff.txt, revision 331887.

> Update/Select failure when BLOB/CLOB fields updated in several rows by PreparedStatement
using setBinaryStream and setCharacterStream
> -------------------------------------------------------------------------------------------------------------------------------------
>
>          Key: DERBY-500
>          URL: http://issues.apache.org/jira/browse/DERBY-500
>      Project: Derby
>         Type: Bug
>   Components: JDBC
>     Versions: 10.1.1.0
>  Environment: Windows 2000, java SDK 1.4
>     Reporter: Peter Kovgan
>     Assignee: Sunitha Kambhampati
>      Fix For: 10.1.2.0, 10.2.0.0, 10.1.1.2
>  Attachments: Derby500.diff.txt, Derby500.stat.txt, Doc_JdbcImpl_paper.diff.txt, V10.1_Derby500.diff.txt,
V10.1_Derby500.stat.txt
>
> I have table contained BLOB and CLOB fields:
> Create table string is:
> private static final String CREATE = "CREATE TABLE ta (" +
>             "ta_id INTEGER NOT NULL," +
>             "mname VARCHAR( 254 ) NOT NULL," +
>             "mvalue INT NOT NULL," +
>             "mdate DATE NOT NULL," +
>             "bytedata BLOB NOT NULL," +
>             "chardata CLOB NOT NULL," +
>             "PRIMARY KEY ( ta_id ))";
> Then I insert 2000 rows in the table.
> Then I update all 2000 rows by command:
> private static final String UPDATE  =  "UPDATE ta " +
>     		"SET bytedata=? ,chardata=? " +
>     		"WHERE mvalue=?";
> /**create blob and clob arrays**/
>         int len1 = 10000;//for blob length data
>         int len2 = 15000;//for clob length data
>         byte buf [] = new byte[len1];
>         for(int i=0;i<len1;i++){
>         	buf [i] = (byte)45;
>         }
>         ByteArrayInputStream bais = new ByteArrayInputStream(buf);
>         
>         char[] bufc = new char[len2];
>         for (int i = 0; i < bufc.length; i++) {
>         	bufc[i] = (char)'b';
> 		}
>         CharArrayReader car = new CharArrayReader(bufc);
> /***/
> PreparedStatement pstmt = connection.prepareStatement(UPDATE);
> pstmt.setBinaryStream(1,bais, len1);
> pstmt.setCharacterStream(2,car, len2);
> pstmt.setInt(3,5000);
> int updated =  pstmt.executeUpdate();
> pstmt.close();
> System.out.printlen("updated ="+updated );
> all 2000 rows updated , because I receive output : updated =2000
> But If I run select (SELECT bytedata ,chardata  FROM ta)  after update, select failed
with error:
> ERROR XSDA7: Restore of a serializable or SQLData object of class , attempted to
>  read more data than was originally stored
>         at org.apache.derby.iapi.error.StandardException.newException(StandardEx
> ception.java)
>         at org.apache.derby.impl.store.raw.data.StoredPage.readRecordFromArray(S
> toredPage.java)
>         at org.apache.derby.impl.store.raw.data.StoredPage.restoreRecordFromSlot
> (StoredPage.java)
>         at org.apache.derby.impl.store.raw.data.BasePage.fetchFromSlot(BasePage.
> java)
>         at org.apache.derby.impl.store.access.conglomerate.GenericScanController
> .fetchRows(GenericScanController.java)
>         at org.apache.derby.impl.store.access.heap.HeapScan.fetchNextGroup(HeapS
> can.java)
>         at org.apache.derby.impl.sql.execute.BulkTableScanResultSet.reloadArray(
> BulkTableScanResultSet.java)
>         at org.apache.derby.impl.sql.execute.BulkTableScanResultSet.getNextRowCo
> re(BulkTableScanResultSet.java)
>         at org.apache.derby.impl.sql.execute.NestedLoopJoinResultSet.getNextRowC
> ore(NestedLoopJoinResultSet.java)
>         at org.apache.derby.impl.sql.execute.NestedLoopLeftOuterJoinResultSet.ge
> tNextRowCore(NestedLoopLeftOuterJoinResultSet.java)
>         at org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.getNextRow
> Core(ProjectRestrictResultSet.java)
>         at org.apache.derby.impl.sql.execute.SortResultSet.getRowFromResultSet(S
> ortResultSet.java)
>         at org.apache.derby.impl.sql.execute.SortResultSet.getNextRowFromRS(Sort
> ResultSet.java)
>         at org.apache.derby.impl.sql.execute.SortResultSet.loadSorter(SortResult
> Set.java)
>         at org.apache.derby.impl.sql.execute.SortResultSet.openCore(SortResultSe
> t.java)
>         at org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.open(BasicN
> oPutResultSetImpl.java)
>         at org.apache.derby.impl.sql.GenericPreparedStatement.execute(GenericPre
> paredStatement.java)
>         at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(EmbedState
> ment.java)
>         at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeStatement(Em
> bedPreparedStatement.java)
>         at org.apache.derby.impl.jdbc.EmbedPreparedStatement.execute(EmbedPrepar
> edStatement.java)
>         at com.beep_beep.dbtest.complex.Benchmark.testSelect(Unknown Source)
>         at com.beep_beep.dbtest.complex.Benchmark.executeSimplestBigTable(Unknown Sour
> ce)
>         at com.beep_beep.dbtest.complex.Benchmark.testBigTable(Unknown Source)
>         at com.beep_beep.dbtest.complex.Benchmark.executeDegradationBenchmark(Unknown
> Source)
>         at com.beep_beep.dbtest.complex.Benchmark.main(Unknown Source)
> From the stack trace and from console I see that Update passed, but error was raised
in Select after Update.
> When I try the same update, but with difference(I changed WHERE clause, causing update
only 1 row):
> private static final String UPDATE  =  "UPDATE ta " +
>     		"SET bytedata=? ,chardata=? " +
>     		"WHERE mname=?";
> PreparedStatement pstmt = connection.prepareStatement(UPDATE);
> pstmt.setBinaryStream(1,bais, len1);
> pstmt.setCharacterStream(2,car, len2);
> pstmt.setInt(3,"PETER");
> int updated =  pstmt.executeUpdate();
> pstmt.close();
> System.out.printlen("updated ="+updated );
> Only 1 row updated , because I receive output : updated =1
> In this case I have NO errors in select(the same as previous) .
> My assumption:
> It seems that Update receives ByteArrayInputStream and updates correctly only 1 row,
then all rows updated by some
> incorrect value(may be because ByteArrayInputStream reached its end in first update),
causing select failure.
> I tested PointBase by the same test and PointBase passed this stage without errors, no
matter how many rows was updated.
> So I think it is a bug.
> Thank you.

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