SQL 获取表结构

select
[表名]=c.Name,
[表说明]=isnull(f.[value],''),
[列序号]=a.Column_id,
[列名]=a.Name,
[列说明]=isnull(e.[value],''),
[数据库类型]=b.Name,
[类型]= case when b.Name = 'image' then 'byte[]'
when b.Name in('image','uniqueidentifier','ntext','varchar','ntext','nchar','nvarchar','text','char') then 'string'
when b.Name in('tinyint','smallint','int','bigint') then 'int'
when b.Name in('datetime','smalldatetime') then 'DateTime'
when b.Name in('float','decimal','numeric','money','real','smallmoney') then 'decimal'
when b.Name ='bit' then 'bool' else b.name end ,
[标识]= case when is_identity=1 then '是' else '' end,
[主键]= case when exists(select 1 from sys.objects x join sys.indexes y on x.Type=N'PK' and x.Name=y.Name
join sysindexkeys z on z.ID=a.Object_id and z.indid=y.index_id and z.Colid=a.Column_id)
then '是' else '' end,
[字节数]=case when a.[max_length]=-1 and b.Name!='xml' then 'max/2G'
when b.Name='xml' then '2^31-1字节/2G'
else rtrim(a.[max_length]) end,
[长度]=case when ColumnProperty(a.object_id,a.Name,'Precision')=-1 then '2^31-1'
else rtrim(ColumnProperty(a.object_id,a.Name,'Precision')) end,
[小数位]=isnull(ColumnProperty(a.object_id,a.Name,'Scale'),0),
[是否为空]=case when a.is_nullable=1 then '是' else '' end,
[默认值]=isnull(d.text,'')

from sys.columns a
left join sys.types b on a.user_type_id=b.user_type_id
inner join sys.objects c on a.object_id=c.object_id and c.Type='U'
left join syscomments d on a.default_object_id=d.ID
left join sys.extended_properties e on e.major_id=c.object_id and e.minor_id=a.Column_id and e.class=1
left join sys.extended_properties f on f.major_id=c.object_id and f.minor_id=0 and f.class=1

ORDER BY c.Name,a.Column_id