project_exercises/STS/Form2.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 STS
{
    public partial class Form2 : Form
    {
        private SqlConnection conn2;
        public event EventHandler Form2Closed;
        public Form2()
        {
            InitializeComponent();
        }
        private void Form2_Load(object sender, EventArgs e)
        {
            conn2 = new SqlConnection();
            conn2.ConnectionString = "Server=localhost;Database=TaskManagementDB;Trusted_Connection=True;";

            defaultValue_Set();
        }
        //设置默认值
        private void defaultValue_Set()
        {
            taskType_tb.Text = "调度任务";
            jobType_cbb.SelectedIndex = 0;
            RTI_tb.Text = "-1";
            taskStatus_tb.Text = "开始执行";
            startLocation_tb.Text = "-";
            endLocation_tb.Text = "-";
        }
        //判断字符串后5位是否为数字
        private bool isDigit(string str)
        {
            if (str.Length != 6)
            {
                return false;
            }
            for (int i = 1; i < str.Length; i++)
            {
                if (str[i] < '0' || str[i] > '9')
                {
                    return false;
                }
            }
            return true;
        }
        private void button1_Click(object sender, EventArgs e)
        {

            //判断条码格式是否正确
            if (barcode_tb.Text.Equals(""))
            {
                MessageBox.Show("条码不能为空！"); return;
            }
            if (barcode_tb.Text[0].ToString() != "T" || !isDigit(barcode_tb.Text.ToString()))
            {
                MessageBox.Show("条码格式错误！\n应以T开头后面跟5个数字"); return;
            }
            conn2.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn2;
            //判断数据库中是否已经有该条码
            cmd.CommandText = $"select * from STM where Barcode='{barcode_tb.Text}'";
            cmd.ExecuteNonQuery();
            SqlDataReader reader = cmd.ExecuteReader();
            if (reader.Read())
            {
                MessageBox.Show("该条码已存在！"); return;
            }
            reader.Close();
            //没有则插入数据
            cmd.CommandText = $"insert into STM values('{barcode_tb.Text}','{STI_tb.Text}','{RTI_tb.Text}','{taskType_tb.Text}'," +
                                                    $"'{jobType_cbb.Text}','{startPoint_tb.Text}','{startLocation_tb.Text}','{endPoint_tb.Text}'," +
                                                    $"'{endLocation_tb.Text}','{taskStatus_tb.Text}','{startTime_dtp.Value.ToString("yyyy-MM-dd HH:mm:ss")}','{errorInfor_tb.Text}')";
            Console.WriteLine(cmd.CommandText);
            int count = cmd.ExecuteNonQuery();
            if (count > 0)
            {
                MessageBox.Show("提交成功！");
                //关闭该窗口
                this.Close();
            }
            else
            {
                MessageBox.Show("提交失败！");
            }
            conn2.Close();
        }
        //关闭窗口时触发事件
        private void Form2_FormClosed(object sender, FormClosedEventArgs e)
        {
            Form2Closed?.Invoke(this, EventArgs.Empty);
        }
        //获得焦点
        private void barcode_tb_GotFocus(object sender, EventArgs e)
        {
            //点击时如果文本框里是默认值才执行以下代码
            if (barcode_tb.Text.Equals("T*****"))
            {
                barcode_tb.Text = "";
                barcode_tb.ForeColor = Color.Black;
            }
        }
        //失去焦点
        private void barcode_tb_LostFocus(object sender, EventArgs e)
        {
            if (barcode_tb.Text.Equals(""))
            {
                barcode_tb.Text = "T*****";
                barcode_tb.ForeColor = Color.Gray;
            }
        }
    }
}