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From "Andreas Korneliussen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1486) ERROR 40XD0 - When exracting Blob from a database
Date Wed, 12 Jul 2006 13:38:30 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1486?page=comments#action_12420614 ] 

Andreas Korneliussen commented on DERBY-1486:
---------------------------------------------

Executing a new statement, will cause a commit on the current transaction, which is in line
with the standard. The result set from the previous statement does not get closed until you
call close() on it or until it has reached the end, or the transaction is rolled back. Since
it is holdable, it is not closed when there is a commit. 

However: 
This is from the Derby doc:

For non-scrollable result sets, immediately following a commit, the only valid operations
that can be performed on the ResultSet object are:

    * positioning the result set to the next row with ResultSet.next().
    * closing the result set with ResultSet.close().

I think it is a bug that the second example does not work when the select statement is "SELECT
* FROM TABLE_2"

>  ERROR 40XD0 - When exracting Blob from a database
> --------------------------------------------------
>
>          Key: DERBY-1486
>          URL: http://issues.apache.org/jira/browse/DERBY-1486
>      Project: Derby
>         Type: Bug

>   Components: Miscellaneous
>     Versions: 10.1.2.1
>  Environment: Windows XP
>     Reporter: David Heath

>
> 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.fillByteHolder(Unknown
Source)
>         at org.apache.derby.impl.store.raw.data.BufferedByteHolderInputStream.read(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 Source)
>         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:81)
>         at BlobTest.main(BlobTest.java:23)
> 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);
>       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 
>     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";
>     Statement stmt = con.createStatement();
>     ResultSet rs = stmt.executeQuery(sql);
>     if (rs.next()) {
>       rs.getInt(1);
>       readTable1(con, id);
>       InputStream stream = rs.getBinaryStream(2);
>       ObjectInputStream objStream = new ObjectInputStream(stream);
>       Object obj = objStream.readObject();   // FAILS HERE
>       double[] array = (double[]) obj;
>       System.out.println(array.length);
>     }
>     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();
>   }
> }
> The Exception DOES NOT occur if call to readTable1() is not made.
> The Exception DOES NOT occur if the size of the Blob is reduced - for example calling:
>       addRows(con, 1000, 1);
> This is a show stopper.
> 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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