WPF簡(jiǎn)單的數(shù)據(jù)庫查詢實(shí)例

更新時(shí)間：2017年11月24日 09:36:50 作者：happy多樂

下面小編就為大家分享一篇WPF簡(jiǎn)單的數(shù)據(jù)庫查詢實(shí)例，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。一起跟隨小編過來看看吧

做一個(gè)簡(jiǎn)單WPF連接數(shù)據(jù)庫的

控件類型和名稱：

DataGrid：dataGrid
Button1 ：Button1
Button    ：Button2
TextBox ：txtuserName

在引用App.config寫數(shù)據(jù)庫的連接字符串

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
 <startup> 
 <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
 </startup>
 <appSettings>
 <!--數(shù)據(jù)庫連接字符串-->
 <add key ="ConnString" value ="Data Source=.;initial Catalog=educ; user=sa; Password=123456;Pooling=true" />
 </appSettings>
</configuration>

Data Source=.表示本機(jī)，可以寫ip地址 initial Catalog=數(shù)據(jù)庫名 user=用戶名 Password=密碼;寫一個(gè)DataBaseHelper的數(shù)據(jù)庫類

namespace _03連接數(shù)據(jù)庫
{
 class DataBaseHelper
 {

 /// 數(shù)據(jù)庫打開連接的方法
 /// 
 /// </summary>
 /// <returns></returns>
 public static SqlConnection getSqlConnection()
 {
 SqlConnection sqlConnection = new SqlConnection(); 
 try
 {
 //獲取數(shù)據(jù)庫字符串
 sqlConnection.ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnString"]; 
 sqlConnection.Open();
 sqlConnection.Close();
 }
 catch 
 {

 throw new Exception("無法連接數(shù)據(jù)庫服務(wù)器"); 
 }
 
 return sqlConnection;
 }

 /// sql增刪改的方法
 /// 
 /// </summary>
 /// <param name="sqlstr"></param>
 /// <returns></returns>
 public static int GetNonQueryEffect(string sqlstr)
 { 
 SqlConnection sqlConnection = new SqlConnection();
 try
 {
 sqlConnection.Open();
 //創(chuàng)建要執(zhí)行的語句
 SqlCommand cmd = new SqlCommand(sqlstr, sqlConnection);
 return cmd.ExecuteNonQuery();//返回執(zhí)行語句中的錯(cuò)誤
 }
 catch (Exception ex)
 {
 throw new Exception(ex.ToString());
 
 }
 finally
 {
 sqlConnection.Close();
 sqlConnection.Dispose();//釋放資源
 }
 
 }

 /// 讀取數(shù)據(jù)的的方法 
 /// 
 /// </summary>
 /// <param name="sqlstr"></param>
 /// <returns></returns>
 public static DataSet GetDataset(string sqlstr)
 {
 SqlConnection conn = getSqlConnection();
 try
 {
 conn.Open();//打開數(shù)據(jù)庫連接
 SqlDataAdapter sda = new SqlDataAdapter(sqlstr ,conn );//更新數(shù)據(jù)庫的命令
 DataSet ds = new DataSet();
 sda.Fill(ds);//填充
 return ds;
 }
 catch (Exception ex)
 {

 throw new Exception(ex.ToString ());
 }
 finally
 {
 conn.Close();
 conn.Dispose();
 }
 } 
 }
}

按鍵的代碼

private void Button_Click_1(object sender, RoutedEventArgs e)
 {
 string str = "select *FROM student";//查詢的語句
 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;
 }

以上這篇WPF簡(jiǎn)單的數(shù)據(jù)庫查詢實(shí)例就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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