1   /// <summary>
 2   /// DbProviderFactory实例
 3   /// </summary>
 4   private static IDbProviderFactory m_factory = null;
 5   
 6         /// <summary>
 7   /// DbFactory实例
 8   /// </summary>
 9   public static IDbProviderFactory Factory
10   {
11    get
12    {
13     if (m_factory == null)
14     {
15      m_factory = Provider.Instance();
16     }
17     return m_factory;
18    }
19   }
20 

 1    /// <summary>
 2     /// Discuz!NT数据接口
 3     /// </summary>
 4     private static IDbProvider m_provider = null;
 5     
 6     /// <summary>
 7     /// IDbProvider接口
 8     /// </summary>
 9   public static IDbProvider Provider
10   {
11    get
12    {
13     if (m_provider == null)
14     {
15      lock(lockHelper)
16      {
17       if (m_provider == null)
18       {
19        try
20        {
21         m_provider = (IDbProvider)Activator.CreateInstance(Type.GetType(string.Format("Discuz.Data.{0}Provider, Discuz.Data.{0}", BaseConfigs.GetDbType)));
22        }
23        catch
24        {
25         throw new Exception("请检查DNT.config中Dbtype节点数据库类型是否正确，例如：SqlServer、Access、MySql，注意大小写。");
26        }
27                             
28       }
29      }
30                     
31      //m_provider = new DbProviderFinder().GetDbProvider("accesss");
32             
33                     
34     }
35     return m_provider;
36    }
37   }
38 

 1  public class SqlServerProvider : IDbProvider
 2     {
 3         public IDbProviderFactory Instance()
 4         {
 5             return SqlClientFactory.Instance;
 6         }
 7 
 8         public void DeriveParameters(IDbCommand cmd)
 9         {
10             if ((cmd as SqlCommand) != null)
11             {
12                 SqlCommandBuilder.DeriveParameters(cmd as SqlCommand);
13             }
14         }
15 
16         public IDataParameter MakeParam(string ParamName, DbType DbType, Int32 Size)
17         {
18             SqlParameter param;
19 
20             if (Size > 0)
21                 param = new SqlParameter(ParamName, (SqlDbType)DbType, Size);
22             else
23                 param = new SqlParameter(ParamName, (SqlDbType)DbType);
24 
25             return param;
26         }
27 
28   
29 
30     }
31 
32     //SqlClientFactory工厂类，提供对SqlServerProvider中的Instance返回实例的支持
33     public class SqlClientFactory : IDbProviderFactory
34     {
35         public static readonly SqlClientFactory Instance;
36 
37         static SqlClientFactory()
38         {
39             Instance = new SqlClientFactory();
40         }
41 
42         private SqlClientFactory()
43         {
44         }
45 
46 
47         public IDbConnection CreateConnection()
48         {
49             return new SqlConnection();
50         }
51 
52         
53         public IDbCommand CreateCommand()
54         {
55             return new SqlCommand();
56         }
57 
58         public IDbDataAdapter CreateDataAdapter()
59         {
60             return new SqlDataAdapter();
61         }
62 
63     }
64 
65