WPF DataGrid顯示MySQL查詢信息，且可刪除、修改、插入 （原發布 csdn 2018-10-13 20:07:28）

一、入行好幾年了，工做中使用數據庫概率很小(傳統行業)。藉着十一假期回家機會，學習下數據庫。

二、初次瞭解數據庫相關知識，若是本文有誤，還望告知。

三、本文主要目的，記錄下wpf界面顯示數據庫信息，且可進行刪除、修改、插入命令。並反饋數據到MySQL。作個記錄，以便之後工做中使用到時沒個頭緒。

四、MySQL的基本講解再也不介紹，安裝過程什麼的，我也是按照網上教程一步一步進行的，假定MySQL已安裝成功，且新建有數據庫，見下圖:

廢話很少說，直接上代碼

界面代碼xaml

<Grid>
        <DataGrid x:Name="DataGrid1" HorizontalAlignment="Left" Height="400" Margin="10,10,0,0" VerticalAlignment="Top" Width="537" LoadingRow="DataGrid_LoadingRow">
            <DataGrid.Columns>
                <DataGridTextColumn Header="id" Width="50" Binding="{Binding Path=id}"/>
                <DataGridTextColumn Header="name" Width="*" Binding="{Binding Path=name}"/>
                <DataGridTextColumn Header="phone" Width="*" Binding="{Binding Path=phone}"/>
                <DataGridTextColumn Header="email" Width="*" Binding="{Binding Path=email}"/>
            </DataGrid.Columns>
        </DataGrid>
        <Button x:Name="DeleteButton" Content="刪除" Margin="0,40,10,0" VerticalAlignment="Top" Click="DeleteButton_Click" HorizontalAlignment="Right" Width="75"/>
        <Button x:Name="UpdateButton" Content="修改" Margin="0,80,10,0" VerticalAlignment="Top" Click="UpdateButton_Click" HorizontalAlignment="Right" Width="75"/>
        <Button x:Name="InsertButton" Content="插入" Margin="0,120,10,0" VerticalAlignment="Top" Click="InsertButton_Click" HorizontalAlignment="Right" Width="75"/>
    </Grid>

後端代碼cs

public partial class MainWindow : Window
    {
        //SQLBulkCopy
        Random rd = new Random();
        string sqlstr = "Data Source=127.0.0.1;User ID=root;Password=root;DataBase=test;Charset=utf8;";
        MySql.Data.MySqlClient.MySqlConnection con;
        MySql.Data.MySqlClient.MySqlDataAdapter adapter;
        System.Data.DataSet ds;
        System.Data.DataTable dt;


        public MainWindow()
        {
            InitializeComponent();

            UpdateMySQLData();
        }

        private void DataGrid_LoadingRow(object sender, System.Windows.Controls.DataGridRowEventArgs e)
        {
            e.Row.Header = e.Row.GetIndex() + 1;
        }

        private void UpdateMySQLData()
        {
            if (con == null)
            {
                con = new MySql.Data.MySqlClient.MySqlConnection(sqlstr);
                con.Open();
            }
            if (adapter == null)
            {
                adapter = new MySql.Data.MySqlClient.MySqlDataAdapter("select * from user", con);
            }
            if (ds == null)
            {
                ds = new System.Data.DataSet();
            }
            ds.Clear();
            adapter.Fill(ds, "user");
            if (dt == null)
            {
                dt = ds.Tables["user"];
            }
            DataGrid1.ItemsSource = dt.DefaultView;
        }

        private void DeleteButton_Click(object sender, RoutedEventArgs e)
        {
            int index = DataGrid1.SelectedIndex;
            if (index == -1) return;
#if MySQLCommand
            string DeleteSqlCommand = string.Format("delete from user where id = '{0}'", dt.Rows[index]["id"]);
            MySql.Data.MySqlClient.MySqlCommand cmd = new MySql.Data.MySqlClient.MySqlCommand(DeleteSqlCommand, con);
            cmd.ExecuteNonQuery();

            UpdateMySQLData();
#else
            dt.Rows[index].Delete();
            //dt.Rows.RemoveAt(index);==dt.Rows[index].Delete() + dt.AcceptChanges()
            MySql.Data.MySqlClient.MySqlCommandBuilder builder = new MySql.Data.MySqlClient.MySqlCommandBuilder(adapter);
            adapter.Update(dt);
            dt.AcceptChanges();
#endif
        }

        private void UpdateButton_Click(object sender, RoutedEventArgs e)
        {
#if MySQLCommand
            int index = DataGrid1.SelectedIndex;
            string UpdateSqlCommand = string.Format("update user set id = '{0}', name = '{1}', phone = '{2}', email = '{3}' where id = '{0}'",
                dt.Rows[index]["id"], dt.Rows[index]["name"], dt.Rows[index]["phone"], dt.Rows[index]["email"]);
            MySql.Data.MySqlClient.MySqlCommand cmd = new MySql.Data.MySqlClient.MySqlCommand(UpdateSqlCommand, con);
            cmd.ExecuteNonQuery();

            UpdateMySQLData();
#else
            MySql.Data.MySqlClient.MySqlCommandBuilder builder = new MySql.Data.MySqlClient.MySqlCommandBuilder(adapter);
            adapter.Update(dt);
            dt.AcceptChanges();
#endif
        }

        private void InsertButton_Click(object sender, RoutedEventArgs e)
        {
#if MySQLCommand
            string InsertSqlCommand = string.Format("insert into user(id, name, phone,email) values('{0}','{1}','{2}','{3}')", rd.Next(100), "ZhangSan", 12332112345, "zhangsan@qq.com");
            MySql.Data.MySqlClient.MySqlCommand cmd = new MySql.Data.MySqlClient.MySqlCommand(InsertSqlCommand, con);
            cmd.ExecuteNonQuery();

            string InsertSqlCommand2 = string.Format("insert into user(id, name, phone,email) values('{0}','{1}','{2}','{3}')", rd.Next(100), "LiSi", 12332112345, "lisi@yahoo.com");
            MySql.Data.MySqlClient.MySqlCommand cmd2 = new MySql.Data.MySqlClient.MySqlCommand(InsertSqlCommand2, con);
            cmd2.ExecuteNonQuery();

            UpdateMySQLData();
#else
            System.Data.DataRow dr = dt.NewRow();
            dr[0] = rd.Next(100);
            dr[1] = "ZhangSan";
            dr[2] = "12332112345";
            dr[3] = "zhangsan@qq.com";
            dt.Rows.Add(dr);

            System.Data.DataRow dr2 = dt.NewRow();
            dr2[0] = rd.Next(100);
            dr2[1] = "LiSi";
            dr2[2] = "12332154321";
            dr2[3] = "lisi@yahoo.com";
            dt.Rows.Add(dr2);

            MySql.Data.MySqlClient.MySqlCommandBuilder builder = new MySql.Data.MySqlClient.MySqlCommandBuilder(adapter);
            adapter.Update(ds, "user");
            dt.AcceptChanges();
#endif
        }

    }

軟件打開界面

刪除時一直不失敗，網上找了很久才找到答案
參考資料
https://blog.csdn.net/sz101/article/details/5837950
https://bbs.csdn.net/wap/topics/390845652
http://www.cnblogs.com/perfect/archive/2007/08/06/844634.html