一、数据库的建立

在fiber_yy数据库下创建yy_user_record表
在这里插入图片描述

可以先手动填入几条数据信息

初始数据库信息
在这里插入图片描述

二、页面的设计

登录注册页面我就不演示了，前几篇博文也都有介绍

flow_query流水查询页面
在这里插入图片描述

三、代码实现

flow_query流水查询页面

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.Sql;
using System.Data.SqlClient;
namespace fiber_yy
{
    
    
    public partial class flow_query : Form
    {
    
    
        private DataSet dsall;
        public string constr = "server=CY-20190824RMES;Initial Catalog=fiber_yy;User ID=sa;pwd=beyond";
        private SqlDataAdapter mDataAdapter;

        public flow_query()
        {
    
    
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
    
    
            try
            {
    
    
                SqlConnection conn = new SqlConnection(constr);
                conn = new SqlConnection(constr);
               
                mDataAdapter = new SqlDataAdapter("SELECT username AS '用户',sex AS '性别',phone AS '手机号',time AS '登录时间' FROM yy_user_record", conn);

                dsall = new DataSet();
                mDataAdapter.Fill(dsall, "hard");
                MessageBox.Show(dsall.ToString());
                dataGridView1.DataSource = dsall.Tables["hard"];
            }
            catch
            {
    
    
                MessageBox.Show("读取失败");
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
    
    
            string account = textBox1.Text;
            try
            {
    
    
                SqlConnection conn = new SqlConnection(constr);
                conn = new SqlConnection(constr);
                //mDataAdapter = new SqlDataAdapter("SELECT username AS '用户',sex AS '性别',phone AS '手机号',time AS '登录时间' FROM yy_user_record WHERE username='" + account + "'", conn);
               
                
                
                mDataAdapter = new SqlDataAdapter("SELECT username AS '用户',sex AS '性别',phone AS '手机号',time AS '登录时间' FROM yy_user_record WHERE username='" + account + "'", conn);


                dsall = new DataSet();
                mDataAdapter.Fill(dsall, "hard");
                dataGridView1.DataSource = dsall.Tables["hard"];
            }
            catch
            {
    
    
                MessageBox.Show("读取失败");
            }

        }
    }
}