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;
}
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脚本之家。
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