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From "Andreas Korneliussen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1511) SELECT clause without a WHERE, causes an Exception when extracting a Blob from a database
Date Thu, 20 Jul 2006 09:18:14 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1511?page=comments#action_12422368 ] 
            
Andreas Korneliussen commented on DERBY-1511:
---------------------------------------------

Yes.

If you modify the code, and replace readTable1(..) with con.commit(), you will see this issue
with autocommit off:

The problem seems to be related to BulkTableScanResultSet. On the first call to next() it
builds an array of rows (rowArray), and feeds the result set with rows from that array. However,
after a commit, the Conglomerate is closed. The BulkTableScanResultSet will continue to feed
rows from the rowArray, and the BLOB columns in these rows depend on reading data from the
Conglomerate (which is closed).

When adding a WHERE clause, the engine will not use BulkTableScanResultSet. Also if the statement
has concurrency CONCUR_UPDATABLE, the engine will not use BulkTableScanResultSet.



> SELECT clause without a WHERE, causes an Exception when extracting a Blob from a database
> -----------------------------------------------------------------------------------------
>
>                 Key: DERBY-1511
>                 URL: http://issues.apache.org/jira/browse/DERBY-1511
>             Project: Derby
>          Issue Type: Bug
>          Components: Miscellaneous
>    Affects Versions: 10.1.2.1
>         Environment: Windows XP
>            Reporter: David Heath
>            Priority: Minor
>
> An exception occurs when extracting a Blob from a database. 
> The following code, will ALWAYS fail with the Exception:
> java.io.IOException: ERROR 40XD0: Container has been closed
>         at org.apache.derby.impl.store.raw.data.OverflowInputStream.fillByteHold
> er(Unknown Source)
>         at org.apache.derby.impl.store.raw.data.BufferedByteHolderInputStream.re
> ad(Unknown Source)
>         at java.io.DataInputStream.read(Unknown Source)
>         at java.io.FilterInputStream.read(Unknown Source)
>         at java.io.ObjectInputStream$PeekInputStream.read(Unknown Source)
>         at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown Source)
>         at java.io.ObjectInputStream$BlockDataInputStream.readDoubles(Unknown So
> urce)
>         at java.io.ObjectInputStream.readArray(Unknown Source)
>         at java.io.ObjectInputStream.readObject0(Unknown Source)
>         at java.io.ObjectInputStream.readObject(Unknown Source)
>         at BlobTest.readRows(BlobTest.java:82)
>         at BlobTest.main(BlobTest.java:24)
> CODE:
> import java.io.*;
> import java.sql.*;
> import java.util.*;
> public class BlobTest
> {
>   private static final String TABLE1 = "CREATE TABLE TABLE_1 ( "
>                                      + "ID INTEGER NOT NULL, "
>                                      + "COL_2 INTEGER NOT NULL, "
>                                      + "PRIMARY KEY (ID) )";
>   private static final String TABLE2 = "CREATE TABLE TABLE_2 ( "
>                                      + "ID INTEGER NOT NULL, "
>                                      + "COL_BLOB BLOB, "
>                                      + "PRIMARY KEY (ID) )";
>   public static void main(String... args) {
>     try {
>       createDBandTables();
>       Connection con = getConnection();
>       addRows(con, 10000, 1);
>       addRows(con, 10000, 2);
>       readRows(con, 1);
>       con.close();
>     }
>     catch(Exception exp) {
>       exp.printStackTrace();
>     }
>   }
>   private static void addRows(Connection con, int size, int id) 
>                                                          throws Exception
>   {
>     String sql = "INSERT INTO TABLE_1 VALUES(?, ?)";
>     PreparedStatement pstmt = con.prepareStatement(sql);
>     pstmt.setInt(1, id);
>     pstmt.setInt(2, 2);
>     pstmt.executeUpdate();
>     pstmt.close();
>     double[] array = new double[size];
>     array[size-1] = 1.23;
>     sql = "INSERT INTO TABLE_2 VALUES(?, ?)";
>     pstmt = con.prepareStatement(sql);
>     pstmt.setInt(1, id);
>     ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
>     ObjectOutputStream objStream = new ObjectOutputStream(byteStream);
>     objStream.writeObject(array);         // Convert object to byte stream 
>     objStream.flush();
>     objStream.close();
>     byte[] bytes = byteStream.toByteArray();
>     ByteArrayInputStream inStream = new ByteArrayInputStream(bytes);
>     pstmt.setBinaryStream(2, inStream, bytes.length);
>     pstmt.executeUpdate();
>     pstmt.close();
>   }
>   private static void readRows(Connection con, int id) throws Exception
>   {
>     String sql = "SELECT * FROM TABLE_2";
> //    String sql = "SELECT * FROM TABLE_2 WHERE ID > 0";
>     Statement stmt = con.createStatement();
>     ResultSet rs = stmt.executeQuery(sql);
>     while (rs.next()) {
>       rs.getInt(1);
>       InputStream stream = rs.getBinaryStream(2);
>       ObjectInputStream objStream = new ObjectInputStream(stream);
>       Object obj = objStream.readObject();
>       double[] array = (double[]) obj;
>       System.out.println(array.length);
>       readTable1(con, id);
>     }
>     rs.close();
>     stmt.close();
>   }
>   private static void readTable1(Connection con, int id) throws Exception {
>     String sql = "SELECT ID FROM TABLE_1 WHERE ID=" + id;    
>     Statement stmt = con.createStatement();
>     ResultSet rs = stmt.executeQuery(sql);
>     if (rs.next()) {
>     }
>     rs.close();
>     stmt.close();
>   }
>   
>   private static Connection getConnection() throws Exception {
>     String driver="org.apache.derby.jdbc.EmbeddedDriver";
>     Properties p = System.getProperties();
>     p.put("derby.system.home", "C:\\databases\\sample");
>     
>     Class.forName(driver);
>     String url = "jdbc:derby:derbyBlob";
>     Connection con = DriverManager.getConnection(url);
>     return con;
>   }
>   private static void createDBandTables() throws Exception {
>     String driver="org.apache.derby.jdbc.EmbeddedDriver";
>     Properties p = System.getProperties();
>     p.put("derby.system.home", "C:\\databases\\sample");
>     
>     Class.forName(driver);
>     String url = "jdbc:derby:derbyBlob;create=true";
>     Connection con = DriverManager.getConnection(url);
>     Statement stmt = con.createStatement();
>     stmt.execute(TABLE1);
>     stmt.execute(TABLE2);
>     stmt.close();
>     con.close();
>   }
> }
> However if the selection clause is changed from:
>     String sql = "SELECT * FROM TABLE_2";
> TO
>     String sql = "SELECT * FROM TABLE_2 WHERE ID > 0";
> The code works without Exception.
> Output from: java org.apache.derby.tools.sysinfo 
> ------------------ Java Information ------------------ 
> Java Version: 1.5.0_05 
> Java Vendor: Sun Microsystems Inc. 
> Java home: C:\Program Files\Java\jre1.5.0_05 
> Java classpath: C:\tools\derby\db-derby-10.1.2.1-bin\lib\derby.jar;C:\tools\der 
> by\db-derby-10.1.2.1-bin\lib\derbytools.jar; 
> OS name: Windows XP 
> OS architecture: x86 
> OS version: 5.1 
> Java user name: David 
> Java user home: C:\Documents and Settings\David 
> Java user dir: C:\david\novice\derby 
> java.specification.name: Java Platform API Specification 
> java.specification.version: 1.5 
> --------- Derby Information -------- 
> JRE - JDBC: J2SE 5.0 - JDBC 3.0 
> [C:\tools\derby\db-derby-10.1.2.1-bin\lib\derby.jar] 10.1.2.1 - (330608) 
> [C:\tools\derby\db-derby-10.1.2.1-bin\lib\derbytools.jar] 10.1.2.1 - (330608) 
> ------------------------------------------------------ 
> ----------------- Locale Information ----------------- 
> ------------------------------------------------------ 

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