写代码生成器的时候经常用到的SQL

1、表添加注释

EXECUTE sp_addextendedproperty N'MS_Description', N'表注释', N'user', N'dbo', N'table', N'表名', NULL, NULL

 

2、查询表名、表注释、表的创建时间

 

SELECT ROW_NUMBER() OVER(ORDER BY t.name ASC) AS Id, t.name AS TableName,p.value AS Comment,t.create_date AS CreateDate FROM

sys.tables AS t LEFT JOIN sys.extended_properties AS p ON p.major_id=t.object_id AND p.minor_id=0

 

3、查询表字段的详细信息

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],'')

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='tab_user' --如果只查询指定表,加上此条件

order by

a.id,a.colorder