This week's giveaway is in the Android forum.
We're giving away four copies of Android Security Essentials Live Lessons and have Godfrey Nolan on-line!
See this thread for details.
The moose likes JDBC and the fly likes Problem in accessing text file using JDBC on zLinux server. Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of Android Security Essentials Live Lessons this week in the Android forum!
JavaRanch » Java Forums » Databases » JDBC
Bookmark "Problem in accessing text file using JDBC on zLinux server." Watch "Problem in accessing text file using JDBC on zLinux server." New topic
Author

Problem in accessing text file using JDBC on zLinux server.

vishal shah
Greenhorn

Joined: Feb 25, 2008
Posts: 3
We are trying to access text files using JDBC on a zLinux server. But, somehow we keep on getting a NullPointerException each time we try to make a connection. The reason we want to connect to it using JDBC is because we have a flat file that contains around 4,000 rows and 100 fields per/row and we want to query like a database.

We are using the driver �jdbcdbcriver={Microsoft Text Driver (*.txt; *.csv)}� for making the connection and it works fine when I try it locally on my Windows machine.

But when we try the same code on one of the zLinux test servers, it throws the NullPointerException. The text files are on the same machine on which the application is deployed.

We are making the connection using following code...

String driver = "jdbcdbcriver={Microsoft Text Driver (*.txt; *.csv)};" + "DBQ=" + path + ";Extensions=asc,csv,tab,txt";
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
conn = DriverManager.getConnection(driver, "", "");

The last line sets conn to null when we try it on the zLinux box. We have also tried things such as replacing the semicolons in the line above with the system dependant File.separatorChar. We tried going about it differently with this code:

Driver d = (Driver)( Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance() );
Properties properties = new Properties();
System.out.println( "Accepts URL: " + d.acceptsURL(driver) );
properties.setProperty(" user" , "");
properties.setProperty(" password" , "" );
conn = d.connect( driver , properties );

This results in us being told that the URL is accepted, but conn is still set to null on the zLinux box (and not on Windows).

Are we using the wrong driver? Is there any other driver which can be used to connect to text file using JDBC on a zLinux server?

Thanks for your replies.
Wei Dai
Ranch Hand

Joined: Jun 22, 2005
Posts: 86
Microsoft Text Driver is for Windows, not for Linux.

>because we have a flat file that contains around 4,000 rows and 100 fields >per/row and we want to query like a database.
You can try free jdbc driver at http://csvjdbc.sourceforge.net/. If you need to read large file quickly, you can try commercial jdbc drive at http://www.hxtt.com/text.html .
 
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.
 
subject: Problem in accessing text file using JDBC on zLinux server.
 
Similar Threads
Problem creating a Microsoft Access connection from a file
jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ= stopped working
no dafault driver specified
JDBC That fails in one workspace but works in another
connecting to ms access database