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：
