SQl统计字段数，表名称，所有表的字段名称

站长苏飞

1、如何用SQL获取一个数据库中的所有表的名称;

[SQL] 纯文本查看 复制代码

SELECT * FROM sysobjects
WHERE xtype='u'

2、如何用SQL获取一个表中所有字段的名称;

[SQL] 纯文本查看 复制代码

SELECT c.name,o.name FROM syscolumns AS c
INNER JOIN sysobjects AS o
ON c.id = o.id
select name from sysobjects where xtype='U'
select name from syscolumns where id=object_id(N'表明')

Select Name from sysobjects where Type='U'
Select Name from syscolumns where ID=OBJECT_ID(N'TableName') Order By ColID

SELECT dbo.sysobjects.name AS , dbo.syscolumns.name AS columns
FROM dbo.sysobjects INNER JOIN
dbo.syscolumns ON dbo.sysobjects.id = dbo.syscolumns.id
WHERE (dbo.sysobjects.xtype = 'u')

select name from sysobjects where xtype='U'
select name from syscolumns where id=object_id(N'name')

3、如何用SQL获取一个数据库中的所有表的名称;

[SQL] 纯文本查看 复制代码

SELECT * FROM sysobjects
WHERE xtype='u'

4、如何用SQL获取一个表中所有字段的名称;

[SQL] 纯文本查看 复制代码

SELECT c.name,o.name FROM syscolumns AS c
INNER JOIN sysobjects AS o
ON c.id = o.id

5.统计所表中所有的字段个数和名称

[SQL] 纯文本查看 复制代码

SELECT c.name,o.name AS stable FROM syscolumns AS c
INNER JOIN sysobjects AS o
ON c.id = o.id WHERE o.name='表名'

--查询表结构信息
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],'')

[SQL] 纯文本查看 复制代码

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 sysproperties g on a.id=g.id and a.colid=g.smallid
left join sysproperties f on d.id=f.id and f.smallid=0
--where d.name='要查询的表' --如果只查询指定表,加上此条件
order by a.id,a.colorder[/code][code=sql]先创建一个视图
Create view fielddesc
as
select o.name as table_name,c.name as field_name,t.name as type,c.length as
length,c.isnullable as isnullable,convert(varchar(30),p.value) as desp
from syscolumns c
join systypes t on c.xtype = t.xusertype
join sysobjects o on o.id=c.id
left join sysproperties p on p.smallid=c.colid and p.id=o.id
where o.xtype='U'
查询时:
Select * from fielddesc where table_name = '你的表名'
还有个更强的语句，是邹建写的，也写出来吧
SELECT
(case when a.colorder=1 then d.name else ' end) N'表名',
a.colorder N'字段序号',
a.name N'字段名',
(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else ' end) N'标识',
(case when (SELECT count(*)
FROM sysobjects
WHERE (name in
(SELECT name
FROM sysindexes
WHERE (id = a.id) AND (indid in
(SELECT indid
FROM sysindexkeys
WHERE (id = a.id) AND (colid in
(SELECT colid
FROM syscolumns
WHERE (id = a.id) AND (name = a.name))))))) AND
(xtype = 'PK'))>0 then '√' else ' end) N'主键',
b.name N'类型',
a.length N'占用字节数',
COLUMNPROPERTY(a.id,a.name,'PRECISION') as N'长度',
isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as N'小数位数',
(case when a.isnullable=1 then '√'else ' end) N'允许空',
isnull(e.text,') N'默认值',
isnull(g.[value],') AS N'字段说明'
--into ##tx
FROM syscolumns a left join systypes b
on a.xtype=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 sysproperties g
on a.id=g.id AND a.colid = g.smallid
order by object_name(a.id),a.colorder

Eagle

代码还是比较全、但对于新人的话，还是有难度的哦！

添加一点汉语注释最好

站长苏飞

Eagle 发表于 2012-10-10 17:53
代码还是比较全、但对于新人的话，还是有难度的哦！

添加一点汉语注释最好

好吧，其实我是没有想好应该怎么写，因为这都是单一的语句，如果只介绍语法应该没有意义

net_love

用这些语句，可以搞代码生成器

站长苏飞

net_love 发表于 2012-11-22 13:03
用这些语句，可以搞代码生成器

呵呵，还是直接使用动软的实在，自己能太累了。