c#做的邮件管理系统

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[T_MailFolder]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [dbo].[T_MailFolder] GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[T_MailUser]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [dbo].[T_MailUser] GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[T_Mails]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [dbo].[T_Mails] GO CREATE TABLE [dbo].[T_MailFolder] ( [ID] [int] IDENTITY (1, 1) NOT FOR REPLICATION NOT NULL , [UserID] [varchar] (250) COLLATE Chinese_PRC_CI_AS NOT NULL , [FolderName] [varchar] (250) COLLATE Chinese_PRC_CI_AS NOT NULL , [MailCount] [int] NOT NULL , [UnReadCount] [int] NOT NULL , [TotalSize] [bigint] NOT NULL ) ON [PRIMARY] GO CREATE TABLE [dbo].[T_MailUser] ( [ID] [int] IDENTITY (1, 1) NOT FOR REPLICATION NOT NULL , [UserID] [varchar] (250) COLLATE Chinese_PRC_CI_AS NOT NULL , [Password] [varchar] (250) COLLATE Chinese_PRC_CI_AS NOT NULL , [Roles] [text] COLLATE Chinese_PRC_CI_AS NOT NULL ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] GO CREATE TABLE [dbo].[T_Mails] ( [ID] [bigint] IDENTITY (1, 1) NOT FOR REPLICATION NOT NULL , [UserID] [varchar] (250) COLLATE Chinese_PRC_CI_AS NOT NULL , [Uidl] [varchar] (250) COLLATE Chinese_PRC_CI_AS NOT NULL , [MessageID] [varchar] (500) COLLATE Chinese_PRC_CI_AS NOT NULL , [IsRead] [tinyint] NOT NULL , [Folder] [varchar] (250) COLLATE Chinese_PRC_CI_AS NOT NULL , [IndexOnServer] [int] NOT NULL , [MailSize] [bigint] NOT NULL , [MailDate] [varchar] (250) COLLATE Chinese_PRC_CI_AS NOT NULL , [MailFrom] [varchar] (250) COLLATE Chinese_PRC_CI_AS NOT NULL , [MailTo] [varchar] (250) COLLATE Chinese_PRC_CI_AS NOT NULL , [CC] [text] COLLATE Chinese_PRC_CI_AS NULL , [Subject] [text] COLLATE Chinese_PRC_CI_AS NULL , [Content] [text] COLLATE Chinese_PRC_CI_AS NULL , [Attachments] [text] COLLATE Chinese_PRC_CI_AS NULL , [SourceCode] [text] COLLATE Chinese_PRC_CI_AS NOT NULL ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] GO