(12)C#ADO.NET 案例----增删改查的小管理窗口

现在可以利用前面的博文中的一些技术来实现一些小功能案例，例如带增删改查的小型管理窗口。下面将会带来一些主要步骤的详解：

①首先还是创建数据库表，这个没什么好说的，直接上图：

②然后定义一个与这个数据库表类型一直的类，名为Customer.cs：

class Customer
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public DateTime? Birthday { get; set; }
        public string Address { get; set; }
        public string TelNum { get; set; }
        public int CustLevel { get; set; }
    }

③开始写三层架构里的DAL层，写在一个CustomerDAL.cs文件中，其中包括InsertCustomer(),DeleteById(),UpdateById(),GetById(),GetAll()这几个函数(增删改查),具体代码如下：

 class CustomerDAL
    {
        public Customer GetById(int id)
        {
           DataTable dt = SqlHelper.ExecuteDataTable("select * from T_Review where Id = @Id",
                new SqlParameter("@Id",id));
           if (dt.Rows.Count <= 0)
           {
               return null;
           }
           else if (dt.Rows.Count > 1)
           {
               throw new Exception("多条数据");
               
           }
           else
           {
               DataRow dr = dt.Rows[0];
               Customer cust = new Customer();
               cust.Id = id;
               cust.Name = (string)dr["Name"];
               cust.Birthday = (DateTime)DBValue.FromDBValue(dr["Birthday"]);
               cust.Address = (string)dr["Address"];
               cust.TelNum = (string)dr["TelNum"];
               cust.CustLevel = (int)dr["CustLevel"];
               return cust;
           }
        }


        public void DeleteById(int id)
        {
            SqlHelper.ExecuteNonQuery("delete from T_Review where Id = @Id",
                new SqlParameter("@Id",id));
        }

        public void UpdateById(Customer customer)
        {
            SqlHelper.ExecuteNonQuery("update T_Review set Name =@Name,Birthday=@Birthday,Address=@Address,TelNum=@TelNum,CustLevel=@CustLevel where Id=@Id",
                new SqlParameter("@name", customer.Name),
                new SqlParameter("@Birthday", DBValue.ToDBValue(customer.Birthday)),
                new SqlParameter("@Address", customer.Address),
                new SqlParameter("@TelNum", customer.TelNum),

                new SqlParameter("@CustLevel", customer.CustLevel),
                new SqlParameter("@Id", customer.Id));
        }


        public void InsertCustomer(Customer customer)
        {
            SqlHelper.ExecuteNonQuery("Insert into T_Review (Name,Birthday,Address,TelNum,CustLevel) values (@Name,@Birthday,@Address,@TelNum,@CustLevel)",
                
                new SqlParameter("@Name",customer.Name),
                new SqlParameter("@Birthday",DBValue.ToDBValue(customer.Birthday)),
                new SqlParameter("@Address",customer.Address),
                new SqlParameter("@TelNum",customer.TelNum),
                new SqlParameter("@CustLevel",customer.CustLevel));
        }


        public List<Customer> GetAll()
        {
             DataTable dt = SqlHelper.ExecuteDataTable("select * from T_Review");
             List<Customer> list = new List<Customer>();

             if (dt.Rows.Count <= 0)
             {
                 return null;
             }
            else 
             
             {
         
                foreach (DataRow dr in dt.Rows)
                {
                   Customer cust = new Customer();
                 cust.Id = (int)dr["Id"];
                 cust.Name = (string)dr["Name"];
                 cust.Birthday = (DateTime?)DBValue.FromDBValue(dr["Birthday"]);
                 cust.Address = (string)dr["Address"];
                 cust.TelNum = (string)dr["TelNum"];
                 cust.CustLevel = (int)dr["CustLevel"];
                   list.Add(cust);
                }
                 return list;
             }
        }

◇这时候“后台”就算是写好了，接下来就是开始调用了。

④新建一个窗口，名为ListWindow.xaml，在这个窗口中加入一个ToolBar和一个DataGrid，分别用来存放按钮和显示数据的,具体的xaml代码如下：

如图：

<Grid>
        <ToolBar Height="26" HorizontalAlignment="Left" Name="toolBar1" VerticalAlignment="Top" Width="278" >
            <Button Content="添加" Name="addBtn" Click="addBtn_Click">
                
            </Button>
            <Button Content="修改" Name="updateBtn" Click="updateBtn_Click">

            </Button>
            <Button Content="删除" Name="deleteBtn" Click="deleteBtn_Click">
                
            </Button>
            <Button Content="查询" Name="selectBtn" Click="selectBtn_Click">
                
            </Button>
            
        </ToolBar>
        <DataGrid AutoGenerateColumns="False" Height="600" HorizontalAlignment="Left" Margin="0,23,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="600" FlowDirection="LeftToRight">
            <DataGrid.Columns>
                <DataGridTextColumn Width="100"  Header="编号" Binding="{Binding Id}"/>
                <DataGridTextColumn Width="100" Header="姓名" Binding="{Binding Name}"/>
                <DataGridTextColumn Width="100" Header="生日" Binding="{Binding Birthday}"/>
                <DataGridTextColumn Width="100" Header="住址" Binding="{Binding Address}"/>
                <DataGridTextColumn Width="100" Header="电话" Binding="{Binding TelNum}"/>
                <DataGridTextColumn Width="100" Header="等级" Binding="{Binding CustLevel}"/>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>

⑤然后再创建一个EditUIWindow.xaml窗口，这个窗口用来添加或者修改ListWindow.xaml中的DataGrid所绑定的数据源得数据：

如图：        

⑥接下来先贴上ListUIWindow.cs的代码：

public partial class ListUIWindow : Window
    {
        public ListUIWindow()
        {
            InitializeComponent();
        }

        private void addBtn_Click(object sender, RoutedEventArgs e)
        {
            AddCustWindow addCW = new AddCustWindow();
            addCW.ShowDialog();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            CustomerDAL cDAL = new CustomerDAL();
            dataGrid1.ItemsSource = cDAL.GetAll();
        }

        private void updateBtn_Click(object sender, RoutedEventArgs e)
        {
            Customer customer = (Customer)dataGrid1.SelectedItem;
            

            AddCustWindow addCW = new AddCustWindow();
                addCW.nameTxt.Text = customer.Name;
            addCW.datePicker1.SelectedDate = customer.Birthday;
            addCW.addrTxt.Text = customer.Address;
            addCW.telnumTxt.Text = customer.TelNum;
            addCW.levelTxt.Text = customer.CustLevel.ToString();
            addCW.addBtn.Content = "保存";
            addCW.ShowDialog();

            
            
        }

        private void deleteBtn_Click(object sender, RoutedEventArgs e)
        {
            Customer customer=(Customer)dataGrid1.SelectedItem;
            int SelectionId = customer.Id;
            CustomerDAL cDAL = new CustomerDAL();
            cDAL.DeleteById(SelectionId);
            MessageBox.Show("删除成功");
            dataGrid1.ItemsSource = cDAL.GetAll();
        }

        private void selectBtn_Click(object sender, RoutedEventArgs e)
        {
            CustomerDAL cDAL = new CustomerDAL();
            dataGrid1.ItemsSource = cDAL.GetAll();
        }


    }

⑦最后便是，EditUIWindow.cs的代码：

    public partial class AddCustWindow : Window
    {
        public AddCustWindow()
        {
            InitializeComponent();
        }

        private void addBtn_Click(object sender, RoutedEventArgs e)
        {
            Customer customer = new Customer();
            customer.Name = nameTxt.Text;            
            customer.Birthday = (DateTime?)datePicker1.SelectedDate;
            customer.Address = addrTxt.Text;
            customer.TelNum = telnumTxt.Text;
            customer.CustLevel = Convert.ToInt32(levelTxt.Text);
            CustomerDAL cDAL = new CustomerDAL();
           
            if ((string)addBtn.Content == "添加")
            {
                 cDAL.InsertCustomer(customer);
            }
            else
            {
                cDAL.UpdateById(customer);
            }
            MessageBox.Show(addBtn.Content + "成功");
            ListUIWindow LUIW = new ListUIWindow();
            LUIW.dataGrid1.ItemsSource = cDAL.GetAll();
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        } 
    }

今天好累。。。怎么变成贴代码了，代码很简单，大家都能看得懂，一起共勉。。。头晕的要命，抱歉。。。。