NetBarManageSystem/Form_srtj.cs

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

namespace NetBarManageSystem_lihang
{
    public partial class Form_srtj : Form
    {
        public Form_srtj()
        {
            InitializeComponent();
        }

       
        private void btn_qd_Click(object sender, EventArgs e)
        {
           
            
            //开始时间和结束时间
            string time1 =this.txt_kssj.Text;
            string time2 =this.txt_jssj.Text;

            if (time1 == "")
            {
                MessageBox.Show("请点击输入开始时间","系统提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
            }
            else
            {
                if (time2 == "")
                {
                    MessageBox.Show("请点击输入结束时间", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }

                else
                {
                    //统计收入的sql语句
                    string sql = "select sum(free) from recordInfo where beginTime between '" + time1 + "' and '" + time2 + "'";

                    DataTable table = sql_zsgc.cx(sql);

                    string sr = table.Rows[0][0] + "元";
                    if (sr == "")
                    {
                        sr = 0 + "";//没有收入记录，改为0
                    }



                    MessageBox.Show("从" + time1 + "到" + time2 + "\n总收入为：" + sr + "", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                
            }
    }
        private void btn_qx_Click(object sender, EventArgs e)
        {