first commit for openGauss connector jdbc

docs/documentation/head/setup.md

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+---
+layout: default_docs
+title: Chapter 2. Setting up the JDBC Driver
+header: Chapter 2. Setting up the JDBC Driver
+resource: media
+previoustitle: Chapter 1. Introduction
+previous: intro.html
+nexttitle: Setting up the Class Path
+next: classpath.html
+---
+		
+**Table of Contents**
+
+* [Getting the Driver](setup.html#build)
+* [Setting up the Class Path](classpath.html)
+* [Preparing the Database Server for JDBC](prepare.html)
+* [Creating a Database](your-database.html)
+
+This section describes the steps you need to take before you can write or run
+programs that use the JDBC interface.
+
+<a name="build"></a>
+# Getting the Driver
+
+Precompiled versions of the driver can be downloaded from the [PostgreSQL™ JDBC web site](http://jdbc.postgresql.org).
+   
+Alternatively you can build the driver from source, but you should only need to
+do this if you are making changes to the source code. To build the JDBC driver,
+you need Ant 1.5 or higher and a JDK. Ant is a special tool for building Java-based
+packages. It can be downloaded from the [Ant web site](http://ant.apache.org/index.html).
+    
+If you have several Java compilers installed, it depends on the Ant configuration
+which one gets used. Precompiled Ant distributions are typically set up to read
+a file `.antrc` in the current user's home directory for configuration. For example,
+to use a different JDK than the default, this may work:
+
+`JAVA_HOME=/usr/local/jdk1.6.0_07`  
+`JAVACMD=$JAVA_HOME/bin/java`
+
+To compile the driver simply run **ant** in the top level directory. The compiled
+driver will be placed in `jars/postgresql.jar`. The resulting driver will be built
+for the version of Java you are running. If you build with a 1.4 or 1.5 JDK you
+will build a version that supports the JDBC 3 specification and if you build with
+a 1.6 or higher JDK you will build a version that supports the JDBC 4 specification.