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From "Andreas Korneliussen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-802) OutofMemory Error when reading large blob when statement type is ResultSet.TYPE_SCROLL_INSENSITIVE
Date Wed, 12 Jul 2006 14:23:31 GMT
     [ http://issues.apache.org/jira/browse/DERBY-802?page=all ]

Andreas Korneliussen updated DERBY-802:
---------------------------------------

    Attachment: derby-802v2.diff

The attached diff (derby-802v2.diff) has one change compared to the first diff:
* The logic for undoing the projection is moved to ProjectRestricResultSet and takes advantage
of the projectMappings array already built there.

> OutofMemory Error when reading large blob when statement type is ResultSet.TYPE_SCROLL_INSENSITIVE
> --------------------------------------------------------------------------------------------------
>
>          Key: DERBY-802
>          URL: http://issues.apache.org/jira/browse/DERBY-802
>      Project: Derby
>         Type: Bug

>   Components: JDBC
>     Versions: 10.0.2.0, 10.0.2.1, 10.0.2.2, 10.1.1.0, 10.2.0.0, 10.1.2.0, 10.1.1.1, 10.1.1.2,
10.1.2.1, 10.1.3.0, 10.1.2.2
>  Environment: all
>     Reporter: Sunitha Kambhampati
>     Assignee: Andreas Korneliussen
>     Priority: Minor
>  Attachments: derby-802.diff, derby-802.stat, derby-802v2.diff
>
> Grégoire Dubois on the list reported this problem.  From his mail: the reproduction
is attached below. 
> When statement type is set to ResultSet.TYPE_SCROLL_INSENSITIVE, outofmemory exception
is thrown when reading large blobs. 
> import java.sql.*;
> import java.io.*;
> /**
> *
> * @author greg
> */
> public class derby_filewrite_fileread {
>    
>     private static File file = new File("/mnt/BigDisk/Clips/BabyMamaDrama-JShin.wmv");
>     private static File destinationFile = new File("/home/greg/DerbyDatabase/"+file.getName());
>    
>     /** Creates a new instance of derby_filewrite_fileread */
>     public derby_filewrite_fileread() {       
>        
>     }
>    
>     public static void main(String args[]) {
>         try {
>             Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();
>             Connection connection = DriverManager.getConnection ("jdbc:derby:/home/greg/DerbyDatabase/BigFileTestDB;create=true",
"APP", "");
>             connection.setAutoCommit(false);
>            
>             Statement statement = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
>             ResultSet result = statement.executeQuery("SELECT TABLENAME FROM SYS.SYSTABLES");
>            
>             // Create table if it doesn't already exists.
>             boolean exist=false;
>             while ( result.next() ) {
>                 if ("db_file".equalsIgnoreCase(result.getString(1)))
>                     exist=true;
>             }
>             if ( !exist ) {
>                 System.out.println("Create table db_file.");
>                 statement.execute("CREATE TABLE db_file ("+
>                                            "     name          VARCHAR(40),"+
>                                            "     file          BLOB(2G) NOT NULL)");
>                 connection.commit();
>             }
>            
>             // Read file from disk, write on DB.
>             System.out.println("1 - Read file from disk, write on DB.");
>             PreparedStatement preparedStatement=connection.prepareStatement("INSERT INTO
db_file(name,file) VALUES (?,?)");
>             FileInputStream fileInputStream = new FileInputStream(file);
>             preparedStatement.setString(1, file.getName());
>             preparedStatement.setBinaryStream(2, fileInputStream, (int)file.length());
          
>             preparedStatement.execute();
>             connection.commit();
>             System.out.println("2 - END OF Read file from disk, write on DB.");
>            
>            
>             // Read file from DB, and write on disk.
>             System.out.println("3 - Read file from DB, and write on disk.");
>             result = statement.executeQuery("SELECT file FROM db_file WHERE name='"+file.getName()+"'");
>             byte[] buffer = new byte [1024];
>             result.next();
>             BufferedInputStream     inputStream=new BufferedInputStream(result.getBinaryStream(1),1024);
>             FileOutputStream outputStream = new FileOutputStream(destinationFile);
>             int readBytes = 0;
>             while (readBytes!=-1) {
>                 readBytes=inputStream.read(buffer,0,buffer.length);
>                 if ( readBytes != -1 )
>                     outputStream.write(buffer, 0, readBytes);
>             }     
>             inputStream.close();
>             outputStream.close();
>             System.out.println("4 - END OF Read file from DB, and write on disk.");
>         }
>         catch (Exception e) {
>             e.printStackTrace(System.err);
>         }
>     }
> }
> It returns
> 1 - Read file from disk, write on DB.
> 2 - END OF Read file from disk, write on DB.
> 3 - Read file from DB, and write on disk.
> java.lang.OutOfMemoryError
> if the file is ~10MB or more

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