Java, JDBC driver: Argh!

[raddevus]

Sander Rossel wrote:

How's that even possible?

The Internet is so clogged up with 25 years of Java documentation you can't find anything out here. It's all hopes and dreams of past generations, but nothing that actually works. :rolleyes:

[Mycroft Holmes]

;P First time I've heard someone bitch about something being over supported.

Never underestimate the power of human stupidity - RAH I'm old. I know stuff - JSOP

[kalberts]

The Internet version of "57 channels and nothing on"

[Jon McKee]

Assuming the JAR is already added in your classpath, try adding Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); before the call to DriverManager.getConnection. I think that's still the full name of the SQL Server driver at least. Those are the two things that commonly cause this error. EDIT: Also if you're curious why javac doesn't seem to care, from what I understand it's because the SQLServerDriver class is never referenced in your code and therefore unnecessary for javac. DriverManager doesn't explicitly load driver classes, it just fetches them which is why you need to explicitly load the class via Class.forName.

[raddevus]

Mycroft Holmes wrote:

First time I've heard someone bitch about something being over supported.

I have an extreme talent for bitching and can do so about good or bad. :-\ :laugh:

[raddevus]

Really great info. Thanks very much. It helps me confirm that I should have everything right. Here's the deal: My CLASSPATH is set to the directory where I'm building and the location of the mssql-jdbc-8.2.2.jre8.jar (downloaded from MS site). I can compile a program that has only the following in it:

try{Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");}
catch(Exception e1){System.out.println(e1);}

When I run it, I see the following exception:

java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver.class

I thought I had the class name incorrect or something so I looked inside the jar (named aboe) and found the class. Maybe this jar is dependent upon another and that one isn't in the classpath or something?? I'm stumped!! Thanks again for the info.:thumbsup:

[Jon McKee]

I have the following example working. Hopefully it helps point you in the right direction. Folder structure:

jdbctest

• classes
• lib
  • mssql-jdbc-8.2.2.jre8.jar
• src
  • JDBCTest.java

Files: JDBCTest.java

import java.sql.Driver;
import java.sql.DriverManager;

public class JDBCTest {

public static void main(String\[\] args)
{
    try
    {
        Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
        Driver sqlServerDriver = DriverManager.getDriver("jdbc:sqlserver://localhost");
        System.out.println(
            sqlServerDriver.toString()
            + ":" + sqlServerDriver.getMajorVersion()
            + "." + sqlServerDriver.getMinorVersion()
        );
    }
    catch (Exception ex)
    {
        System.out.println(ex.getMessage());
    }
} 

}

Commands (run from project directory):

javac -d classes src/JDBCTest.java
java -classpath classes:lib/* test.JDBCTest

It should print out "SQLServerDriver:1:8.2".

[raddevus]

Wow! That is a really great detailed example. Thanks so much.:thumbsup: I'm going to try it right now. I'll set it up exactly like yours and we will see what happens. Thanks again. I will let you know. :)

[raddevus]

I set up everything exactly the same as you showed, but I did have to alter a couple of things to get it working... When I ran java -classpath classes:lib/* test.JDBCTest from the project directory, I got an error that said:

Error: Could not find or load main class test.JDBCTest

If I run it successfully from the classes directory, it throws an exception that outputs:

com.microsoft.sqlserver.jdbc.SQLServerDriver

I believe the test.JDBCTest is not correct on the last line in your example, but I'm not sure. Seems like that would have it in a pkg named test, right? I'm hacking around but still don't quite have it. Thanks

[raddevus]

Wow!! I finally figured it out because I screwed around with -classpath so much!!. I'm on Windows so the separator has to be ; not a : Once I did that your instructions worked with the following java command:

java -classpath classes;lib/* JDBCTest

Notice I removed the test. (pkg name) and I changed the : to a ; While trying to get it working, I changed the output to have separate lines :

SQLServerDriver:1
8
2

Thanks so much, you got me there. Phew...