Re: Using JDBC

On Tuesday, January 14, 2003, at 10:58 AM, Marcelo Pereira wrote:
<snip>
> /*
> ** pgdbping.java - programa para testar uma conexo jdbc com PostGRES
> **
> ** Elielson - 24.07.2002
> */
>
> import java.sql.*;
>
> class pgdbping {

This is all going to be way OT for this list, but....

Is your file named "pgdbping.java"? There is a 1-to-1 relationship
(case *sensitive*) between class names and filenames.

<snip>
> $ java test.java

"java" runs *compiled* classes. Similar to how "perl" runs scripts.

> $ javac test.class

"javac" compiles java source code into java class files. Similar to
how "gcc" compiles C code into binaries.

> Exception in thread "main" java.lang.NoClassDefFoundError: test/class
>
> Is this the right way to compile/run the source codes?

nope.

> Any ideas??

Assuming your source is named pgdbping.java:

1) compile it:
# export CLASSPATH=.:/path/to/postgres.jar
# javac pgdbping.java

2) run it:
# export CLASSPATH=.:/path/to/postgres.jar
# java pgdbping

You really should read over the tutorials on Java at sun's site
(java.sun.com). They cover the basics of compiling/running classes,
setting classpaths, etc.

You can also just type "java" and "javac" to get help/usage information
for each tool.

eric