JDBC基本案例

  public static void main(String[] args) throws Exception {
    //1注册驱动
    Class.forName("com.mysql.jdbc.Driver");

    //2建立连接
    String url = "jdbc:mysql://xxxx:xxx/xxx";
    String usernName = "******"; //登录数据库的账号
    String password = "******"; //登录数据库的密码
    Connection conn = DriverManager.getConnection(url, usernName, password);

    //3获取执行sQL语句的对象
    Statement statement = conn.createStatement();

    //4获取数据库返回的结果
    String sql = "delete from test1 where id = " + 1;
    String sqlUpdate = "update test3 set age = "+ 30 +" where id = " + 2;
    String sqlInsert = "INSERT INTO test3 VALUES(5,'tomcat','60');";
    String query = "SELECT * FROM test3";


    //5处理数据集
//    int i = statement.executeUpdate(sql);
//    int s = statement.executeUpdate(sqlUpdate);
//    int ins = statement.executeUpdate(sqlInsert);
    ResultSet rs = statement.executeQuery(query);

//    System.out.println(i + "行受到影响----删除");
//    System.out.println(s + "行受到影响----更新");
//    System.out.println(ins + "行受到影响----插入");
    while (rs.next()){
      System.out.println("查询数据：" + rs.getString("name") + ";年龄：" + rs.getString("age"));
    }

    //6关闭连接
    statement.close();
    conn.close();
  }