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：
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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,
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Case When Syscolumns.Name In
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(Select 主键=A.Name
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From Syscolumns A
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Inner Join Sysobjects B On A.Id=B.Id And B.Xtype='U' And B.Name<>'Dtproperties'
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Where Exists(Select 1 From Sysobjects Where Xtype='Pk' And Name In (
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Select Name From Sysindexes Where Indid In(
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Select Indid From Sysindexkeys Where Id = A.Id And Colid=A.Colid
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)))
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And B.Name=Sysobjects.Name
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)
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Then 1 Else 0 End As Is_key
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From Sysobjects,Systypes,Syscolumns
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Left Join Sysproperties On (Syscolumns.Id = Sysproperties.Id And
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Syscolumns.Colid = Sysproperties.Smallid)
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Where (Sysobjects.Xtype ='U' Or Sysobjects.Xtype ='V')
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And Sysobjects.Id = Syscolumns.Id And Systypes.Xtype = Syscolumns.Xtype
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And Systypes.Name <> 'Sysname' And Sysobjects.Name Like '%' Order By Sysobjects.Name, Syscolumns.Colid
结果如图：
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