客户管理系统之模块设计(四)

2，添加客户和修改客户模块

关于客户的添加模块和修改模块均使用的是一个窗体，其其区别是根据向窗体中所传递的参数来实现的，这个模块的客户名称，性别和重要程度是必填项，当添加客户时，其主要功能就是向CustomerManagement数据库的customer数据表中插入客户的基本信息；当更改客户信息时，其主要的功能就是更改CustomerManagement数据库中的customer数据表中的一条数据记录。

添加或修改客户模块的示例：

(1)加载公共类和创建ID属性，代码为：

<span style="font-size:18px;">        common cm = new common();//加载公共类common
        database db = new database();//加载公共类database

        private int _id;
        public int ID//ID属性用于区分是添加还是修改客户资料
        {
            get//取属性值
            {
                return _id;
            }
            set
            {
                _id = value;//设置属性值
            }
        }</span>

添加ID属性，这个属性非常重要，它用来区分是添加客户，还是修改客户。

(2)编写根据ID显示客户资料的代码为：

<span style="font-size:18px;">        private void showChildren1(int t)//根据ID显示客户资料
        {
            SqlDataReader dr;
            db.runSql("select * from customer where id="+t,out dr);
            if (dr.Read())//显示出客户信息
            {
                tbName.Text = dr["useName"].ToString();
                cm.cbbIndexByText(cbbNation, dr["nation"].ToString());
                dtpBrithday.Value = DateTime.Parse(dr["brithday"].ToString());
                cm.cbbIndexByText(cbbSex,dr["sex"].ToString());
                tbCard.Text = dr["IDcard"].ToString();
                tbLove.Text = dr["love"].ToString();
                cm.cbbIndexByText(cbbMarriage,dr["marriage"].ToString());
                cm.cbbIndexByText(cbbConcernment, dr["source"].ToString());
                cm.cbbIndexByText(cbbLevel, dr["levels"].ToString());
                cm.cbbIndexByText(cbbEarning, dr["earning"].ToString());
                cm.cbbIndexByText(cbbSource, dr["concernment"].ToString());
                tbMobile.Text = dr["mobile"].ToString();
                tbTel.Text = dr["tel"].ToString();
                tbQQ.Text = dr["QQ"].ToString();
                cm.cbbIndexByText(cbbKultur,dr["Kultur"].ToString());
                tbEmail.Text = dr["Email"].ToString();
                cm.cbbIndexByText(cbbProvince,dr["province"].ToString());
                cm.cbbIndexByText(cbbCity,dr["city"].ToString());
                tbAddress.Text = dr["address"].ToString();
                dtpAddTime.Value = DateTime.Parse(dr["addTime"].ToString());
            }
            else
            {
                MessageBox.Show("你所要修改的项不存在，系统将关闭此窗体！");
                Close();
            }
            dr.Close();
        }
</span>

完整窗体代码为：

<span style="font-size:18px;">using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;//引入的命名空间

namespace 客户管理系统
{
    public partial class addChildren1 : Form
    {
        common cm = new common();//加载公共类common
        database db = new database();//加载公共类database

        private int _id;
        public int ID//ID属性用于区分是添加还是修改客户资料
        {
            get//取属性值
            {
                return _id;
            }
            set
            {
                _id=value;//设置属性值
            }
        }

        public addChildren1()//构造函数
        {
            InitializeComponent();
        }

        private void btn_close_Click(object sender, EventArgs e)//关闭按钮的Click事件
        {
            Close();//关闭窗体
        }

        private void addChildren1_Load(object sender, EventArgs e)
        {
            try
            {
                cbbNation.SelectedIndex=0;//选择第一项
                cbbMarriage.SelectedIndex = 0;//选择第一项
                cbbSource.SelectedIndex = 0;//选择第一项
                cbbKultur.SelectedIndex = 0;//选择第一项
                cbbConcernment.SelectedIndex = 0;//选择第一项
                cbbLevel.SelectedIndex = 0;//选择第一项
                if (_id != 0)
                {
                    Text = "客户管理信息修改";//设置窗体标签
                    btn_add.Text = "修改";//设置按钮标签
                    showChildren1(_id);//显示数据
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());//显示出错信息
            }
        }

        private void showChildren1(int t)//根据ID显示客户资料
        {
            SqlDataReader dr;
            db.runSql("select * from customer where id="+t,out dr);
            if (dr.Read())//显示出客户信息
            {
                tbName.Text = dr["useName"].ToString();
                cm.cbbIndexByText(cbbNation, dr["nation"].ToString());
                dtpBrithday.Value = DateTime.Parse(dr["brithday"].ToString());
                cm.cbbIndexByText(cbbSex,dr["sex"].ToString());
                tbCard.Text = dr["IDcard"].ToString();
                tbLove.Text = dr["love"].ToString();
                cm.cbbIndexByText(cbbMarriage,dr["marriage"].ToString());
                cm.cbbIndexByText(cbbConcernment, dr["source"].ToString());
                cm.cbbIndexByText(cbbLevel, dr["levels"].ToString());
                cm.cbbIndexByText(cbbEarning, dr["earning"].ToString());
                cm.cbbIndexByText(cbbSource, dr["concernment"].ToString());
                tbMobile.Text = dr["mobile"].ToString();
                tbTel.Text = dr["tel"].ToString();
                tbQQ.Text = dr["QQ"].ToString();
                cm.cbbIndexByText(cbbKultur,dr["Kultur"].ToString());
                tbEmail.Text = dr["Email"].ToString();
                cm.cbbIndexByText(cbbProvince,dr["province"].ToString());
                cm.cbbIndexByText(cbbCity,dr["city"].ToString());
                tbAddress.Text = dr["address"].ToString();
                dtpAddTime.Value = DateTime.Parse(dr["addTime"].ToString());
            }
            else
            {
                MessageBox.Show("你所要修改的项不存在，系统将关闭此窗体！");
                Close();
            }
            dr.Close();
        }

        private void btn_add_Click(object sender, EventArgs e)//btn_add按钮的Click事件
        {
            if (tbName.Text.Trim().Length<=0)//判断是否输入用户名
            {
                MessageBox.Show("请输入用户名称！");
                tbName.Focus();//获取焦点
                btn_add.DialogResult = DialogResult.None;
                return;
            }
            if (cbbSex.SelectedIndex<0)//判断是否选择了性别
            {
                MessageBox.Show("请选择性别！");
                cbbSex.Focus();//获取焦点
                btn_add.DialogResult = DialogResult.None;
                return;
            }
            if (cbbEarning.SelectedIndex < 0)//判断是否选择了重要程度
            {
                MessageBox.Show("请选择重要程度！");
                cbbEarning.Focus();//获取焦点
                btn_add.DialogResult = DialogResult.None;
                return;
            }
            if (tbMobile.Text.Trim().Length<=0||tbTel.Text.Trim().Length<=0)//判断手机号码和联系电话号码是否至少填写了一个
            {
                MessageBox.Show("请将电话号码和手机号码至少填写一个！");
                tbMobile.Focus();//获取焦点
                btn_add.DialogResult = DialogResult.None;
                return;
            }
            string sql = "";
            string Rstatus = "添加";
            if (_id==0)//添加客户信息的字符串
            {
                sql="insert into customer(userName,nation,brithday,sex,IDcard,love,marriage,source,levels,earning,concernment,mobile,tel,QQ,Kultur,Email,province,city,address,addTime)values"
                    +"('"+tbName.Text.Trim()+"','"+cbbNation.Text+"','"+dtpBrithday.Value+"','"+cbbSex+"','"+tbCard.Text.Trim()+
                "','"+tbLove.Text.Trim()+"','"+cbbMarriage.Text+"','"+cbbConcernment.Text+"','"+cbbLevel.Text+
                "','"+cbbEarning.SelectedItem+"','"+cbbSource.Text+"','"+tbMobile.Text.Trim()+"','"+
                tbTel.Text.Trim()+"','"+tbQQ.Text.Trim()+"','"+cbbKultur.Text+"','"+tbEmail.Text.Trim()+
                "','"+cbbProvince.Text+"','"+cbbCity.Text+"','"+tbAddress.Text.Trim()+"','"+dtpAddTime.Value+"')";
            }
            else//修改客户信息的字符串
	        {
                Rstatus="修改";
                sql="update customer set userName='"+
                    tbName.Text.Trim()+"',nation='"+
                    cbbNation.Text+"',brithday='"+
                    dtpBrithday.Value+"',sex='"+
                    cbbSex.Text+"',IDcard='"+
                    tbCard.Text.Trim()+"',love='"+
                    tbLove.Text.Trim()+"',marriage='"+
                    cbbMarriage.Text+"',source='"+
                    cbbConcernment.Text+"',levels='"+
                    cbbLevel.Text.Trim()+"',earning='"+
                    cbbEarning.Text.Trim()+"',concernment='"+
                    cbbSource.Text.Trim()+"',mobile='"+
                    tbMobile.Text.Trim()+"',tel='"+
                    tbTel.Text.Trim()+"',QQ='"+
                    tbQQ.Text.Trim()+"',Kultur='"+
                    cbbKultur.Text.Trim()+"',Email='"+
                    tbEmail.Text.Trim()+"',province='"+
                    cbbProvince.Text.Trim()+"',city='"+
                    cbbCity.Text.Trim()+"',address='"+
                    tbAddress.Text.Trim()+"',addTime='"+
                    dtpAddTime.Value+"'where id="+_id;
	        }
            db.runSql(sql);//执行sql语句
            MessageBox.Show(Rstatus+"成功！");
        }
    }
}
</span>

运行整个程序的结果为;

添加客户窗体：

修改客户信息资料窗体：