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File Transfer DB Help!

 
Ve Ne
Greenhorn
Posts: 1
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I have a longraw column in my Oracle Database. I converted it into Image Datatype in SQL Server...Now I wanna extract the files into my NT Folder. This is what I wrote. All microsoft files are opening (xls,doc,mpp,txt) but no pdf,jpg,bmp files are opening. Pls. help! what am i missing here? Is it because I converted Oracle Longraw to SQL server Image datatype or is something in the Java code missing or Java cannot handle?
***********************
import java.sql.*;
import java.io.*;

public class binext{
public static void main(String[] args) throws Exception{

String url = "jdbc:microsoft:sqlserver://<server name>DatabaseName=<Name>";
String uid = "<UID>";
String pw = "<password>";

try {// Load driver class
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
}
catch (java.lang.ClassNotFoundException e) {
System.err.println("ClassNotFoundException: " +e);
}
String Query;
int FileLength;
Connection cn;
ResultSet rs;
int file_id_seq;
String FileName;

file_id_seq = Integer.parseInt(args[0]);
FileName = args[1];

//instantiate the class
FileDBTransfer fdb = new FileDBTransfer();

Connection con = null;

con = DriverManager.getConnection(url,uid,pw);
rs = fdb.getRS(con,"SELECT document_data FROM sar_fac_file_cabinet where file_id_seq=" + file_id_seq);
fdb.getBinaryFile(args[1], rs);
con.close();

}//end main
}
[ June 02, 2005: Message edited by: Bear Bibeault ]
 
Rajasekar Kayamboo
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Can you please post the error or exception (if any) you get in order to get a better idea of whatis happening?
regards,
 
Paul Sturrock
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Posts: 10336
Eclipse IDE Hibernate Java
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The image data type in SQL server has some restrictions when used in select statements, for example if the data stored in it is greater that 8000 bytes you can't simply include an image data type in a select statement. It needs to be handled via TSQL in a block by block manner. Have a read of the T-SQL documentation about the ReadText function.

This problem stems from SQL Server not really being designed to store large blocks of binary data. There are MS only technologies (such as ADO) which can work round this, but this it not going to work with Java. You might consider storing the files outside the DB and keeping a path to them in the DB, which is a much less problematic approach.
[ June 02, 2005: Message edited by: Paul Sturrock ]
 
Alin Sinpalean
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> This problem stems from SQL Server not really being designed to store large
> blocks of binary data. There are MS only technologies (such as ADO) which can
> work round this, but this it not going to work with Java.

SQL Server is able to store LOBs without problems. Also, a good JDBC driver will be able to store and retrieve IMAGE and TEXT data just fine. Try jTDS, for example (disclaimer: I'm a jTDS developer). Use get/setBinaryStream() or get/setBlob().

Regarding the OPs problem: you could try to use a binary diff tool to see if and what gets broken. Also a post of the code behind could help, as well as the code you have used to move your data from Oracle to SQL Server.

Alin,
The jTDS Project.
 
It is sorta covered in the JavaRanch Style Guide.
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