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

 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Configuration; 6 using System.Data.SqlClient; 7 using System.Data; 8  9 namespace ADO10 {11     class SqlHelper12     {13         PRivate static string connStr = ConfigurationManager.ConnectionStrings["dbConnStr"].ConnectionString;14 15         public static int ExecuteNonQuery(string sql)16         {17             using (SqlConnection conn = new SqlConnection(connStr))18             {19                 conn.Open();20                 using (SqlCommand cmd = conn.CreateCommand())21                 {22                     cmd.CommandText = sql;23                     return cmd.ExecuteNonQuery();//返回的是值是insert,delete,update影响了多少行24                 }25             }26         }27 28         public static object ExecuteScalar(string sql)29         {30             using (SqlConnection conn = new SqlConnection(connStr))31             {32                 conn.Open();33                 using (SqlCommand cmd = conn.CreateCommand())34                 {35                     cmd.CommandText = sql;36                     return cmd.ExecuteScalar();37                 }38 39             }40         }41         //只用来执行查询结果比较小的sql42         public static DataSet ExecuteDataSet(string sql)43         {44             using (SqlConnection conn = new SqlConnection(connStr))45             {46                 conn.Open();47                 using (SqlCommand cmd = conn.CreateCommand())48                 {49                     cmd.CommandText = sql;50                     SqlDataAdapter adapter = new SqlDataAdapter(cmd);51                     DataSet dataset = new DataSet();52                     adapter.Fill(dataset);53                     return dataset;54                 }55 56             }       57         }58         //防止sql注入漏洞攻击59         public static DataTable ExecuteDataTable(string sql,SqlParameter [] parameters)60         {61             using (SqlConnection conn = new SqlConnection(connStr))62             {63                 conn.Open();64                 using (SqlCommand cmd = conn.CreateCommand())65                 {66                     cmd.CommandText = sql;67                     cmd.Parameters.AddRange(parameters);68 69                     SqlDataAdapter adapter = new SqlDataAdapter(cmd);70                     DataSet dataset = new DataSet();71                     adapter.Fill(dataset);72                     return dataset.Tables[0];73                 }74 75             }76         }77     }78 }

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