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：
