eee/DailyWorkManagementSystem/Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DailyWorkManagementSystem
{
    public partial class Form_DWR : Form
    {
        private String connString = "Server=localhost;Database=DailyWorkRecordDB;Trusted_Connection=True;";
        public Form_DWR()
        {
            InitializeComponent();
        }

        private void Form_DWR_Load(object sender, EventArgs e)
        {
            dateTimePicker1_ValueChanged(sender, e);
        }

        private void save_btn_Click(object sender, EventArgs e)
        {
            //获取日期年月日
            string date = dateTimePicker1.Value.ToString("yyyy-MM-dd");
            //读取文本框内容
            string morning = rTB_morning.Text;
            string afternoon = rTB_afternoon.Text;
            //连接数据库 
            SqlConnection conn = new SqlConnection(connString);
            conn.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = $"Select count(*) from DWR where Date='{date}'";
            //判断是否存在该日期的记录
            int count = (int)cmd.ExecuteScalar();
            if (count == 0)
            {
                cmd.CommandText = $"insert into DWR(Date,Morning,Afternoon) values('{date}','{morning}','{afternoon}')";
                int result_insert = cmd.ExecuteNonQuery();
                if (result_insert > 0)
                {
                    MessageBox.Show("保存成功！");
                }
                conn.Close();
            }
            else
            {
                cmd.CommandText = $"update DWR set Morning='{morning}',Afternoon='{afternoon}' where Date='{date}'";
                int result_edit = cmd.ExecuteNonQuery();
                if (result_edit > 0)
                {
                    MessageBox.Show("保存成功！");
                }
                conn.Close();
            }
        }

        private void dateTimePicker1_ValueChanged(object sender, EventArgs e)
        {
            //清空文本框
            rTB_morning.Text = "";
            rTB_afternoon.Text = "";
            //获取日期年月日
            string date = dateTimePicker1.Value.ToString("yyyy-MM-dd");
            //连接数据库
            SqlConnection conn = new SqlConnection();
            conn.ConnectionString = "Server=localhost;Database=DailyWorkRecordDB;Trusted_Connection=True;";
            conn.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = $"select * from DWR where Date='{date}'";
            SqlDataReader reader = cmd.ExecuteReader();
            //读取数据
            while (reader.Read())
            {
                rTB_morning.Text = reader["Morning"].ToString();
                rTB_afternoon.Text = reader["Afternoon"].ToString();
            }

            conn.Close();
        }

        private void before_btn_Click(object sender, EventArgs e)
        {
            //更改日期到前一天
            dateTimePicker1.Value = dateTimePicker1.Value.AddDays(-1);
        }

        private void after_btn_Click(object sender, EventArgs e)
        {
            //更改日期到后一天
            dateTimePicker1.Value = dateTimePicker1.Value.AddDays(1);
        }
        //清空按键-上午
        private void clear_btn1_Click(object sender, EventArgs e)
        {
            rTB_morning.Text = "";
        }
        //清空按键-下午
        private void clear_btn2_Click(object sender, EventArgs e)
        {
            rTB_afternoon.Text = "";
        }
    }
}