.Net常用技巧_获取SQL Server表字段的各种属性

-- SQL Server 2000

SELECT a.name AS 字段名, CASE WHEN EXISTS 
(SELECT 1 
FROM sysobjects 
WHERE xtype = PK AND parent_obj = a.id AND name IN 
(SELECT name 
FROM sysindexes 
WHERE indid IN 
(SELECT indid 
FROM sysindexkeys 
WHERE id = a.id AND colid = a.colid))) 
THEN 1 ELSE 0 END AS 主键, CASE WHEN COLUMNPROPERTY(a.id, a.name, 
IsIdentity) = 1 THEN 1 ELSE 0 END AS 标识, b.name AS 类型, 
a.length AS 占用字节数, COLUMNPROPERTY(a.id, a.name, PRECISION) AS 长度, 
a.xscale AS 小数, a.isnullable AS 可空, ISNULL(e.text, ‘‘) AS 默认值, ISNULL(g.[value], 
‘‘) AS 字段说明 
FROM syscolumns a LEFT OUTER JOIN 
systypes b ON a.xusertype = b.xusertype INNER JOIN 
sysobjects d ON a.id = d.id AND d.xtype = U AND 
d.name <> dtproperties LEFT OUTER JOIN 
syscomments e ON a.cdefault = e.id LEFT OUTER JOIN 
sysproperties g ON a.id = g.id AND a.colid = g.smallid LEFT OUTER JOIN 
sysproperties f ON d.id = f.id AND f.smallid = 0 
WHERE (d.name = 表名称)

 

--2,SQL SERVER 2005

SELECT CASE WHEN EXISTS 
(SELECT 1 
FROM sysobjects 
WHERE xtype = PK AND parent_obj = a.id AND name IN 
(SELECT name 
FROM sysindexes 
WHERE indid IN 
(SELECT indid 
FROM sysindexkeys 
WHERE id = a.id AND colid = a.colid))) THEN 1 ELSE 0 END AS key, CASE WHEN COLUMNPROPERTY(a.id, a.name, 
IsIdentity) = 1 THEN 1 ELSE 0 END AS identity, a.name AS ColName, c.name AS TypeName, a.length AS byte, COLUMNPROPERTY(a.id, a.name, 
PRECISION) AS length, a.xscale, a.isnullable, ISNULL(e.text, ‘‘) AS default, ISNULL(p.value, ‘‘) AS comment 
FROM sys.syscolumns AS a INNER JOIN 
sys.sysobjects AS b ON a.id = b.id INNER JOIN 
sys.systypes AS c ON a.xtype = c.xtype LEFT OUTER JOIN 
sys.syscomments AS e ON a.cdefault = e.id LEFT OUTER JOIN 
sys.extended_properties AS p ON a.id = p.major_id AND a.colid = p.minor_id 
WHERE (b.name = keyfactory) AND (c.status <> 1) 
--b.name = Keyfactory,Keyfactory为你想要查找的数据表。

 

--2,SQL SERVER 2008

SELECT 
    表名       = case when a.colorder=1 then d.name else ‘‘ end,
    表说明     = case when a.colorder=1 then isnull(f.value,‘‘) else ‘‘ end,
    字段序号   = a.colorder,
    字段名     = a.name,
    标识       = case when COLUMNPROPERTY( a.id,a.name,IsIdentity)=1 then else ‘‘ end,
    主键       = case when exists(SELECT 1 FROM sysobjects where xtype=PK and parent_obj=a.id and name in (
                     SELECT name FROM sysindexes WHERE indid in( SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid))) then  else ‘‘ end,
    类型       = b.name,
    占用字节数 = a.length,
    长度       = COLUMNPROPERTY(a.id,a.name,PRECISION),
    小数位数   = isnull(COLUMNPROPERTY(a.id,a.name,Scale),0),
    允许空     = case when a.isnullable=1 then else ‘‘ end,
    默认值     = isnull(e.text,‘‘),
    字段说明   = isnull(g.[value],‘‘)
FROM 
    syscolumns a
left join 
    systypes b 
on 
    a.xusertype=b.xusertype
inner join 
    sysobjects d 
on 
    a.id=d.id  and d.xtype=U and  d.name<>dtproperties
left join 
    syscomments e 
on 
    a.cdefault=e.id
left join 
sys.extended_properties   g 
on 
    a.id=G.major_id and a.colid=g.minor_id  
left join 

sys.extended_properties f
on 
    d.id=f.major_id and f.minor_id=0
where 
    d.name=Product    --如果只查询指定表,加上此条件
order by 
    a.id,a.colorder

 

 

 

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