.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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