java 使用jdbc连接Greenplum数据库和Postgresql数据库

1、公司使用的Greenplum和Postgresql，确实让我学到不少东西。简单将使用jdbc连接Greenplum和Postgresql数据库。由于使用maven仓库，不能下载Greenplum的jar包，但是可以下载Postgresql的jar包，所以Greenplum的jar包，自己可以百度自行下载。名字就叫做greenplum.jar。

maven依赖如下所示：

<!-- https://mvnrepository.com/artifact/org.postgresql/postgresql -->
<dependency>
    <groupId>org.postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>42.1.</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-beanutils/commons-beanutils -->
<dependency>
    <groupId>commons-beanutils</groupId>
    <artifactId>commons-beanutils</artifactId>
    <version>1.9.</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-logging/commons-logging -->
<dependency>
    <groupId>commons-logging</groupId>
    <artifactId>commons-logging</artifactId>
    <version>1.1.</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-collections/commons-collections -->
<dependency>
    <groupId>commons-collections</groupId>
    <artifactId>commons-collections</artifactId>
    <version>3.2.</version>
</dependency>

2、db.properties配置文件里面如下所示：

# .posgresql
posgresql_driver=org.postgresql.Driver
posgresql_url=jdbc:postgresql://192.168.xx.xx:5432/数据库名称(即schema)
posgresql_user=账号
posgresql_password=密码

# .greenplum
greenplum_driver=com.pivotal.jdbc.GreenplumDriver
greenplum_url=jdbc:pivotal:greenplum://192.168.xx.xx:5432;DatabaseName=数据库名称(即schema)
greenplum_user=账号
greenplum_password=密码

3、然后连接Greenplum数据库和Postgresql数据库如下所示：

 public class JdbcUtils {

     // 1、Postgresql
     private static String postgresql_driver;
     private static String postgresql_url;
     private static String postgresql_user;
     private static String postgresql_password;

     // 2、Greenplum
     private static String greenplum_driver;
     private static String greenplum_url;
     private static String greenplum_user;
     private static String greenplum_password;

     // 1、Postgresql
     static {
         postgresql_driver = ResourceBundle.getBundle("db").getString("postgresql_driver");
         postgresql_url = ResourceBundle.getBundle("db").getString("postgresql_url");
         postgresql_user = ResourceBundle.getBundle("db").getString("postgresql_user");
         postgresql_password = ResourceBundle.getBundle("db").getString("postgresql_password");
     }

     // 2、Greenplum
     static {
         greenplum_driver = ResourceBundle.getBundle("db").getString("greenplum_driver");
         greenplum_url = ResourceBundle.getBundle("db").getString("greenplum_url");
         greenplum_user = ResourceBundle.getBundle("db").getString("greenplum_user");
         greenplum_password = ResourceBundle.getBundle("db").getString("greenplum_password");
     }    

     // 1、Postgresql
     public static Connection getPostgresqlConnection() throws ClassNotFoundException, SQLException {
         // 加载数据库驱动
         Class.forName(postgresql_driver);
         // System.out.println("测试加载数据库成功");
         Connection con = DriverManager.getConnection(postgresql_url, postgresql_user, postgresql_password);
         // System.out.println("测试数据库链接成功");
         return con;
     }

     // 2、Greenplum
     public static Connection getGreenplumConnection() throws ClassNotFoundException, SQLException {
         // 加载数据库驱动
         Class.forName(greenplum_driver);
         //System.out.println("测试加载数据库成功");
         Connection con = DriverManager.getConnection(greenplum_url, greenplum_user, greenplum_password);
         //System.out.println("测试数据库链接成功");
         return con;
     }

     public static void main(String[] args) {
             try {
                 JdbcUtils.getPostgresqlConnection();
                 System.out.println("汇聚数据区连接成功.....");
                 System.out.println("=======================================");

                 JdbcUtils.getGreenplumConnection();
                 System.out.println("核心数据区连接成功.....");
                 System.out.println("=======================================");

             } catch (ClassNotFoundException e) {
                 e.printStackTrace();
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
 }        

4、最后，可以根据公司业务进行一些增删改查操作。略。

待续......