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 ADO

10 {

11     class SqlHelper

12     {

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sql

42         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