正在作一个关于SQL SERVER数据库导入Excel文件的程序，要读取数据库中的列的信息，从网上找了很多资料，终于总结出来比较理想的sql语句，执行后返回的列分别是：表名、列名、列类型、列长度、列描述、是否主键，语句如下：

1　Select Sysobjects.Name As Tb_name, Syscolumns.Name As Col_name, Systypes.Name As Col_type, Syscolumns.Length As Col_len, Isnull(Sysproperties.Value,Syscolumns.Name) As Col_memo,

2　Case When Syscolumns.Name In

3　(Select 主键=A.Name

4　From Syscolumns A

5　Inner Join Sysobjects B On A.Id=B.Id And B.Xtype=U And B.Name<>Dtproperties

6　Where Exists(Select 1 From Sysobjects Where Xtype=Pk And Name In (

7　Select Name From Sysindexes Where Indid In(

8　Select Indid From Sysindexkeys Where Id = A.Id And Colid=A.Colid

9　)))

10　And B.Name=Sysobjects.Name

11　)

12　Then 1 Else 0 End As Is_key

13

14　From Sysobjects,Systypes,Syscolumns

15　Left Join Sysproperties On (Syscolumns.Id = Sysproperties.Id And

16　Syscolumns.Colid = Sysproperties.Smallid)

17

18　Where (Sysobjects.Xtype =U Or Sysobjects.Xtype =V)

19　And Sysobjects.Id = Syscolumns.Id And Systypes.Xtype = Syscolumns.Xtype

20　And Systypes.Name <> Sysname And Sysobjects.Name Like % Order By Sysobjects.Name, Syscolumns.Colid

结果如图：