WPF简单的数据库查询

 做一个简单WPF连接数据库的

控件类型和名称：DataGrid：dataGrid          Button1  ：Button1              Button：   Button2               TextBox ： txtuserName

 在引用App.config写数据库的连接字符串

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
   <appSettings>
    <!--数据库连接字符串-->
    <add key ="ConnString" value ="Data Source=.;initial Catalog=educ; user=sa; Password=123456;Pooling=true" />
  </appSettings>
</configuration>
<add key ="ConnString" value ="Data Source=.;initial Catalog=educ; user=sa; Password=123456;Pooling=true" />
                                 Data Source=.表示本机，可以写ip地址  initial Catalog=数据库名  user=用户名 Password=密码;
写一个DataBaseHelper的数据库类
 1 namespace _03连接数据库
 2 {
 3     class DataBaseHelper
 4     {
 5 
 6         /// 数据库打开连接的方法
 7         /// 
 8         /// </summary>
 9         /// <returns></returns>
10         public static SqlConnection getSqlConnection()
11         {
12             SqlConnection sqlConnection = new SqlConnection();          
13             try
14             {
15                  //获取数据库字符串
16                 sqlConnection.ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnString"];           
17                 sqlConnection.Open();
18                 sqlConnection.Close();
19             }
20             catch 
21             {
22 
23                 throw new Exception("无法连接数据库服务器"); 
24             }
25           
26             return sqlConnection;
27         }
28 
29         /// sql增删改的方法
30         /// 
31         /// </summary>
32         /// <param name="sqlstr"></param>
33         /// <returns></returns>
34         public static int GetNonQueryEffect(string sqlstr)
35         {        
36             SqlConnection sqlConnection = new SqlConnection();
37             try
38             {
39                 sqlConnection.Open();
40                 //创建要执行的语句
41                 SqlCommand cmd = new SqlCommand(sqlstr, sqlConnection);
42                 return cmd.ExecuteNonQuery();//返回执行语句中的错误
43             }
44             catch (Exception ex)
45             {
46                 throw new Exception(ex.ToString());
47                 
48             }
49             finally
50             {
51                 sqlConnection.Close();
52                 sqlConnection.Dispose();//释放资源
53             }
54           
55         }
56 
57          ///  读取数据的的方法    
58          ///  
59          /// </summary>
60          /// <param name="sqlstr"></param>
61          /// <returns></returns>
62         public static DataSet GetDataset(string sqlstr)
63         {
64             SqlConnection conn = getSqlConnection();
65             try
66             {
67                 conn.Open();//打开数据库连接
68                 SqlDataAdapter sda = new SqlDataAdapter(sqlstr ,conn );//更新数据库的命令
69                 DataSet ds = new DataSet();
70                 sda.Fill(ds);//填充
71                 return ds;
72             }
73             catch (Exception ex)
74             {
75 
76                 throw new Exception(ex.ToString ());
77             }
78             finally
79             {
80                 conn.Close();
81                 conn.Dispose();
82             }
83         }    
84     }
85 }

 按键的代码

 1   private void Button_Click_1(object sender, RoutedEventArgs e)
 2         {
 3             string str = "select *FROM student";//查询的语句
 4             dataGrid.ItemsSource = DataBaseHelper.GetDataset(str).Tables[0].DefaultView;
 5             
 6         }
 7         private void Button_Click_2(object sender, RoutedEventArgs e)
 8         {
 9             if (txtuserName.Text.Trim()== " ")
10             {
11                 return;
12             }
13             string strr = string.Format("select *FROM student where sname='{0}'", txtuserName.Text);
14             dataGrid.ItemsSource = DataBaseHelper.GetDataset(strr).Tables[0].DefaultView;
15         }

 

posted @ 2017-11-06 16:40  wb_enduo  阅读(5957)  评论(2)  编辑  收藏  举报