Linux下加载JDBC驱动连接OceanBase

1. 安装jdbc驱动

vi ~/.bashrc  

添加如下内容：

export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:/home/xiaochu.yh/tools/mysql-connector-java-5.1.6/mysql-connector-java-5.1.6-bin.jar

OceanBase使用JDBC 5.1.6版本。

2. 使用jdbc驱动

vi  MySQLConnection.java ，输入下面的代码；然后javac MySQLConnection.java 编译；最后java MySQLConnection运行即可

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class MySQLConnection {
  public static void main(String[] args) {
    Connection conn = null;
    Statement stmt = null;
    ResultSet rs = null;
    String url = null;
    String user = null;
    String password = null;
    String sql = null;
    try {
      Class.forName("com.mysql.jdbc.Driver"); //加载mysq驱动
    } catch (ClassNotFoundException e) {
      System.out.println("驱动加载错误");
      e.printStackTrace();//打印出错详细信息
    }
    try {
      url = "jdbc:mysql://10.10.10.7:4797/test?user=admin&password=admin&useUnicode=true&&characterEncoding=gb2312&autoReconnect = true";
      user = "admin";
      password = "admin";
      conn = DriverManager.getConnection(url,user,password);
    } catch (SQLException e) {
      System.out.println("数据库连接错误");
      e.printStackTrace();
    }
    try {
      stmt = conn.createStatement();
      sql = "select * from dept"; //dept这张表有deptno，deptname和age这三个字段
      rs = stmt.executeQuery(sql);//执行sql语句
      while(rs.next()) {
        System.out.print(rs.getInt("deptno") + "   ");
        System.out.print(rs.getString("deptname") + "   ");
        System.out.println(rs.getInt("age") + "   ");
      }
    } catch (SQLException e) {
      System.out.println("数据操作错误");
      e.printStackTrace();
    }
    //关闭数据库
    try {
      if(rs != null) {
        rs.close();
        rs = null;
      }
      if(stmt != null) {
        stmt.close();
        stmt = null;
      }
      if(conn != null) {
        conn.close();
        conn = null;
      }
    } catch(Exception e) {
      System.out.println("数据库关闭错误");
      e.printStackTrace();
    }
  }
}