C# WPF 连接数据库Sqlhelper类

从视频上学习到的WPF连接数据库的方法

需要配置一个 configuration 文件，包含 SQL instance 的相关信息

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Configuration;
 using System.Data.SqlClient;
 using System.Data;

 namespace ADO
 {
     class SqlHelper
     {
         private static string connStr = ConfigurationManager.ConnectionStrings["dbConnStr"].ConnectionString;

         public static int ExecuteNonQuery(string sql)
         {
             using (SqlConnection conn = new SqlConnection(connStr))
             {
                 conn.Open();
                 using (SqlCommand cmd = conn.CreateCommand())
                 {
                     cmd.CommandText = sql;
                     return cmd.ExecuteNonQuery();//返回的是值是insert,delete,update影响了多少行
                 }
             }
         }

         public static object ExecuteScalar(string sql)
         {
             using (SqlConnection conn = new SqlConnection(connStr))
             {
                 conn.Open();
                 using (SqlCommand cmd = conn.CreateCommand())
                 {
                     cmd.CommandText = sql;
                     return cmd.ExecuteScalar();
                 }

             }
         }
         //只用来执行查询结果比较小的sql
         public static DataSet ExecuteDataSet(string sql)
         {
             using (SqlConnection conn = new SqlConnection(connStr))
             {
                 conn.Open();
                 using (SqlCommand cmd = conn.CreateCommand())
                 {
                     cmd.CommandText = sql;
                     SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                     DataSet dataset = new DataSet();
                     adapter.Fill(dataset);
                     return dataset;
                 }

             }
         }
         //防止sql注入漏洞攻击
         public static DataTable ExecuteDataTable(string sql,SqlParameter [] parameters)
         {
             using (SqlConnection conn = new SqlConnection(connStr))
             {
                 conn.Open();
                 using (SqlCommand cmd = conn.CreateCommand())
                 {
                     cmd.CommandText = sql;
                     cmd.Parameters.AddRange(parameters);

                     SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                     DataSet dataset = new DataSet();
                     adapter.Fill(dataset);
                     return dataset.Tables[];
                 }

             }
         }
     }
 }

数据库配置文件如下

使用SQL Server 2K8 R2 作为数据库

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <connectionStrings>
    <add name="dbConnStr" connectionString="Data Source=.\mysql; Initial Catalog=test;User ID=sa;Password=123456"/>

  </connectionStrings>
</configuration>

在WPF中应用Sqlhelper ，可以方便连接数据库操作