jdbc链接oracle语法

public class LangDemo {  public static void main(String[] args) throws Exception{      try {                 //加载驱动
                Class.forName("oracle.jdbc.driver.OracleDriver");                //建立链接
                Connection   cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");
                Statement sm=cn.createStatement();                //得到结果集
                ResultSet rs=sm.executeQuery("select name,nickname,id from a");                //遍历结果集
                 while(rs.next()){
System.out.println("name:"+rs.getString(1));//rs.getString(“name”)System.out.println("nickname:"+rs.getString(2));  //rs.getInt(“id”)}
        } catch (Exception e) {
                   e.printStackTrace();
        }finally{   // rs.close();                               // conn.close();                 }
    }
}

public class LangDemo {  public static void main(String[] args) throws Exception{
    Connection con = null;// 建立一个数据库链接
       PreparedStatement pre = null;// 建立预编译语句对象，通常都是用这个而不用Statement
       ResultSet result = null;// 建立一个结果集对象
     try
      {
        Class.forName("oracle.jdbc.driver.OracleDriver");// 加载Oracle驱动程序
        System.out.println("开始尝试链接数据库！");
        String url = "jdbc:oracle:" + "thin:@127.0.0.1:1521:XE"; // 127.0.0.1是本机地址，XE是精简版Oracle的默认数据库名
        String user ="system";// 用户名,系统默认的帐户名
        String password = "147";// 你安装时选设置的密码
        con = DriverManager.getConnection(url, user, password);// 获取链接
        System.out.println("链接成功！");
        String sql = "select * from student where name=?";// 预编译语句，“？”表明参数
        pre = con.prepareStatement(sql);// 实例化预编译语句
        pre.setString(1, "张三");// 设置参数，前面的1表示参数的索引，而不是表中列名的索引
        result = pre.executeQuery();// 执行查询，注意括号中不须要再加参数
        while (result.next())            // 当结果集不为空时
            System.out.println("学号:" + result.getInt("id") + "姓名:"
                    + result.getString("name"));
     }      catch (Exception e)
       {
            e.printStackTrace();
        }       finally  {
            ……..
        } 
    }
}

 jdbc也有事物：connection.setAutoCommit(false) 默认是true自动提交

　　                  connection.commit();

                         connection.rollback();

public class LangDemo {    public static void main(String[] args) throws Exception{        try {            //加载驱动
            Class.forName("oracle.jdbc.driver.OracleDriver");            //建立链接
            Connection cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");            //调用存储过程(存储过程的两个值都是in)
           CallableStatement sm=cn.prepareCall("{call lv_three(?,?)}");           //赋值
           sm.setString(1, "jerry");
           sm.setInt(2, 1800);
           sm.execute();           //释放资源           sm.close();
           cn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }finally{  
             // sm.close();             // conn.close();        }
    }
}

public class LangDemo {    public static void main(String[] args) throws Exception{        try {            //加载驱动
            Class.forName("oracle.jdbc.driver.OracleDriver");            //建立链接
            Connection   cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");            //调用存储过程(存储过程的第一个参数是in,第二个参数是out)
           CallableStatement sm=cn.prepareCall("{call lv_four(?,?)}");           //赋值
           sm.setInt(1, 1);
           sm.registerOutParameter(2, oracle.jdbc.OracleTypes.VARCHAR);//固定的           　　　  sm.execute() String namestr=sm.getString(2);
           System.out.println("名称是："+namestr);           
           sm.close(); //释放资源           cn.close();
        } catch (Exception e) {
                   e.printStackTrace();
        }finally{ 
        　　 // sm.close();            // conn.close();        }
    }
}

public class LangDemo {  public static void main(String[] args) throws Exception{      try {            //加载驱动
            Class.forName("oracle.jdbc.driver.OracleDriver");            //建立链接
            Connection   cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");            //调用存储过程(两个out参数)
           CallableStatement sm=cn.prepareCall("{call lv_four(?,?)}");           //赋值
           sm.registerOutParameter(1, oracle.jdbc.OracleTypes.NUMBER);
           sm.registerOutParameter(2, oracle.jdbc.OracleTypes.VARCHAR);
           sm.execute();            int sid=sm.getInt(1);
           String namestr=sm.getString(2);
           System.out.println(“名称是：”+namestr+”id是”+sid);           
           sm.close(); //释放资源           cn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }finally{            // sm.close();            // conn.close();        }
    }
}

public class LangDemo {  public static void main(String[] args) throws Exception{      try {           //加载驱动
           Class.forName("oracle.jdbc.driver.OracleDriver");           //建立链接
           Connection   cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");           //调用存储过程(参数为in out类型)
           CallableStatement sm=cn.prepareCall("{call getsal(?)}");           //赋值
          sm.setInt(1,1);    //  sm.setDouble(1,800);
      sm.registerOutParameter(1, oracle.jdbc.OracleTypes.NUMBER);          
       sm.execute();          int sid=sm.getInt(1);    // double d = sm.getDouble(1)
          System.out.println("id是："+sid);           
          sm.close(); //释放资源          cn.close();
        } catch (Exception e) {
                   e.printStackTrace();
        }finally{  
             // sm.close();             // conn.close();        }
    }
}

若是是链接mysql

加载驱动：

 Class.forName("com.mysql.jdbc.Driver");
 String url="jdbc:mysql://localhost:3306/db_pms";       //注意：db_pms是自定义数据库的名字