WPF简单的数据库查询实例

 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

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

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;
}

来源：http://www.cnblogs.com/enduo/p/7793907.html