MySQL的简单使用和JDBC示例

MySQL的简单使用和JDBC示例

学习了：https://www.cnblogs.com/orezero/p/5937211.html

package com.stono;

import java.sql.*;

public class CountTradeMark {
    public static void main(String[] args) {
        String driverName ="com.mysql.jdbc.Driver";
        String URL = "jdbc:mysql://127.0.0.1:3306/mydb";
        String sql = "SELECT * FROM mydb.mytable";
        String username = "root";
        String password = "";
        Connection conn = null;
        try{

            //加载驱动
            Driver.class.forName(driverName);

            //建立连接
            conn = DriverManager.getConnection(URL,username,password);

            //创建statement来执行sql语句
            Statement ps =  conn.createStatement();

            //结果集处理
            ResultSet rs = ps.executeQuery(sql);
            while(rs.next()) {
                System.out.println(rs.getString("name")+","+rs.getString("sex")+","+rs.getInt("age"));
            }
        }
        catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        catch(SQLException e){
            e.printStackTrace();
        }

        //关闭连接
        finally{
            if(conn!=null){
                try{
                    conn.close();
                }catch(SQLException e){
                    e.printStackTrace();
                }
            }
        }
    }
}