JDBC连接数据库

public class Test3 {
    public static void main( String[] args ){
        Connection conn = null;
        Statement statement = null;
        try {
            //1.加载驱动
            Class.forName("com.mysql.jdbc.Driver");
            //2.获取和数据库的连接通道
            String url = "jdbc:mysql://localhost:3306/scott?characterEncoding=UTF8&autoReconnect=true&useSSL=true";
            String user = "root";
            String password = "123456";
            conn = DriverManager.getConnection(url, user, password);
            //3.获取操作数据库的方式（查询通道）
            statement = conn.createStatement();
            //4.查询数据
            String sql = "select 'id'as 'test_id','name'from'test'";
            //5.执行查询
            ResultSet rs = statement.executeQuery(sql);
            while (rs.next()){
                //每次会获取下一条数据
                //通过游标来获取指定列
//              int id = rs.getInt(1);//从一开始
                //通过列名来获取指定列
                int id = rs.getInt("test_id");
                String name = rs.getString("name");
                System.out.printf("%d,%srn",name,id);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if(conn != null)
                    conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}