如何查询出一个表的主键字段名称,类型,长度的清单.
请注意,我需要的最终效果格式是如下:
表名 主键名 序号 类型
Mytable MyID 1 int
Mytable DBGrid_Name 2 varchar(500)
Mytable MyMoney 3 decimal(18,4)
Mytable MyDate 4 datetime附:
我通过语句
select * from information_schema.columns where table_name = 'Mytable'来查询,却只能查询出下面这样的格式
表名 主键名 序号 类型
Mytable MyID 1 int
Mytable DBGrid_Name 2 varchar
Mytable MyMoney 3 decimal
Mytable MyDate 4 datetime虽然还有其他字段已标注了长度,小数位等信息,但却很难将它们组合成我想要的那种效果
特来求助高手们。
请注意,我需要的最终效果格式是如下:
表名 主键名 序号 类型
Mytable MyID 1 int
Mytable DBGrid_Name 2 varchar(500)
Mytable MyMoney 3 decimal(18,4)
Mytable MyDate 4 datetime附:
我通过语句
select * from information_schema.columns where table_name = 'Mytable'来查询,却只能查询出下面这样的格式
表名 主键名 序号 类型
Mytable MyID 1 int
Mytable DBGrid_Name 2 varchar
Mytable MyMoney 3 decimal
Mytable MyDate 4 datetime虽然还有其他字段已标注了长度,小数位等信息,但却很难将它们组合成我想要的那种效果
特来求助高手们。
有两个列Numeric_Precision和Numeric_Scale自己研究.
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
以字符为单位的最大长度,适于二进制数据、字符数据,或者文本和图像数据。
NUMERIC_PRECISION
近似数字数据、精确数字数据、整数数据或货币数据的精度。否则,返回 NULL。
NUMERIC_SCALE
近似数字数据、精确数字数据、整数数据或货币数据的小数位数。否则,返回 NULL。
---------------------得到值..连接字符串还用说吗?
我的代码是这样写的。。
--下面是先把关键字段查出来插到 #AA里去
SELECT A.TABLE_NAME,A.COLUMN_NAME,A.ORDINAL_POSITION,B.DATA_TYPE,B.CHARACTER_MAXIMUM_LENGTH
,B.CHARACTER_OCTET_LENGTH,B.NUMERIC_PRECISION,B.NUMERIC_SCALE
into #AA
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE A,information_schema.columns B
WHERE A.COLUMN_NAME=B.COLUMN_NAME
and (A.TABLE_NAME='User_ADD_Dbgrid_Column_For_Self' and B.TABLE_NAME='User_ADD_Dbgrid_Column_For_Self')--下面的语句是通过系统表各个字段的值,组合起来组成 MyType.
--我这样写,会让int类型也会生成int(10,0),这样的格式。。
select *,DATA_TYPE+'('+isnull(cast(CHARACTER_MAXIMUM_LENGTH as varchar(50)),'')+
case right(isnull(cast(NUMERIC_PRECISION as varchar(50)),'')+','+isnull(cast(NUMERIC_SCALE as varchar(50)),''),1)
when ',' then left(isnull(cast(NUMERIC_PRECISION as varchar(50)),'')+','+isnull(cast(NUMERIC_SCALE as varchar(50)),''),len(isnull(cast(NUMERIC_PRECISION as varchar(50)),'')+','+isnull(cast(NUMERIC_SCALE as varchar(50)),''))-1)
else isnull(cast(NUMERIC_PRECISION as varchar(50)),'')+','+isnull(cast(NUMERIC_SCALE as varchar(50)),'')
end+')' MyType
from #AA
WHERE TABLE_NAME='表名'3: 以下这个查询表结构的语句可能大家都见过:利用syscolumns,sysindexes,sysindexkeys三个表关联可以查出主键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 ##txFROM 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
(
select o.name as 表名,c.name as 主键名,t.name as 类型
from sysindexes i
join sysindexkeys k on i.id = k.id and i.indid = k.indid
join sysobjects o on i.id = o.id
join syscolumns c on i.id=c.id and k.colid = c.colid
join systypes t on c.xusertype=t.xusertype
where o.xtype = 'U'
and exists(select 1 from sysobjects where xtype = 'PK' and parent_obj=i.id and name = i.name)
) n where n.表名 < m.表名) + 1,
m.类型
from
(
select o.name as 表名,c.name as 主键名,t.name as 类型
from sysindexes i
join sysindexkeys k on i.id = k.id and i.indid = k.indid
join sysobjects o on i.id = o.id
join syscolumns c on i.id=c.id and k.colid = c.colid
join systypes t on c.xusertype=t.xusertype
where o.xtype = 'U'
and exists(select 1 from sysobjects where xtype = 'PK' and parent_obj=i.id and name = i.name)
) m
order by 序号
Mytable MyID 1 int
Mytable DBGrid_Name 2 varchar(500)
Mytable MyMoney 3 decimal(18,4)
Mytable MyDate 4 datetime
Mytable MyID 1 int
Mytable DBGrid_Name 2 varchar(500)
Mytable MyMoney 3 decimal(18,4)
Mytable MyDate 4 datetime