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
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<?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
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namespace _03连接数据库{ class DataBaseHelper { /// 数据库打开连接的方法 /// /// </summary> /// <returns></returns> public static SqlConnection getSqlConnection() { SqlConnection sqlConnection = new SqlConnection(); try { //获取数据库字符串 sqlConnection.ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnString"]; sqlConnection.Open(); sqlConnection.Close(); } catch { throw new Exception("无法连接数据库服务器"); } return sqlConnection; } /// sql增删改的方法 /// /// </summary> /// <param name="sqlstr"></param> /// <returns></returns> public static int GetNonQueryEffect(string sqlstr) { SqlConnection sqlConnection = new SqlConnection(); try { sqlConnection.Open(); //创建要执行的语句 SqlCommand cmd = new SqlCommand(sqlstr, sqlConnection); return cmd.ExecuteNonQuery();//返回执行语句中的错误 } catch (Exception ex) { throw new Exception(ex.ToString()); } finally { sqlConnection.Close(); sqlConnection.Dispose();//释放资源 } } /// 读取数据的的方法 /// /// </summary> /// <param name="sqlstr"></param> /// <returns></returns> public static DataSet GetDataset(string sqlstr) { SqlConnection conn = getSqlConnection(); try { conn.Open();//打开数据库连接 SqlDataAdapter sda = new SqlDataAdapter(sqlstr ,conn );//更新数据库的命令 DataSet ds = new DataSet(); sda.Fill(ds);//填充 return ds; } catch (Exception ex) { throw new Exception(ex.ToString ()); } finally { conn.Close(); conn.Dispose(); } } }} |
按键的代码
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private void Button_Click_1(object sender, RoutedEventArgs e) { string str = "select *FROM student";//查询的语句 dataGrid.ItemsSource = DataBaseHelper.GetDataset(str).Tables[0].DefaultView; } private void Button_Click_2(object sender, RoutedEventArgs e) { if (txtuserName.Text.Trim()== " ") { return; } string strr = string.Format("select *FROM student where sname='{0}'", txtuserName.Text); dataGrid.ItemsSource = DataBaseHelper.GetDataset(strr).Tables[0].DefaultView; } |
以上这篇WPF简单的数据库查询实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/enduo/p/7793907.html
