first commit for openGauss connector jdbc

docs/documentation/92/classpath.md

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+---
+layout: default_docs
+title: Setting up the Class Path
+header: Chapter 2. Setting up the JDBC Driver
+resource: media
+previoustitle: Chapter 2. Setting up the JDBC Driver
+previous: setup.html
+nexttitle: Preparing the Database Server for JDBC
+next: prepare.html
+---
+
+To use the driver, the JAR archive named `postgresql.jar` if you built from source,
+otherwise it will likely be (named with the following convention: `postgresql-*[server version]*.*[build number]*.jdbc*[JDBC version]*.jar`,
+for example `postgresql-8.0-310.jdbc3.jar`) needs to be included in the class path,
+either by putting it in the `CLASSPATH` environment variable, or by using flags on
+the **java** command line.
+
+For instance, assume we have an application that uses the JDBC driver to access
+a database, and that application is installed as `/usr/local/lib/myapp.jar`. The
+PostgreSQL™ JDBC driver installed as `/usr/local/pgsql/share/java/postgresql.jar`.
+To run the application, we would use:
+
+*export CLASSPATH=/usr/local/lib/myapp.jar:/usr/local/pgsql/share/java/postgresql.jar:*.  
+*java MyApp*
+
+Loading the driver from within the application is covered in [Chapter 3, Initializing the Driver](use.html).