SQL SERVER添加表注释、字段注释

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--取表注释
SELECT
A.name AS table_name, B.name AS column_name, C.value AS column_description FROM sys.tables A INNER JOIN sys.columns B ON B.object_id = A.object_id LEFT JOIN sys.extended_properties C ON C.major_id = B.object_id AND C.minor_id = B.column_id WHERE A.name = 't_dept';

--取视图注释

SELECT A.name AS table_name, B.name AS column_name, C.value AS column_description
FROM sys.views A
INNER JOIN sys.columns B ON B.object_id = A.object_id
LEFT JOIN sys.extended_properties C ON C.major_id = B.object_id AND C.minor_id = B.column_id
WHERE A.name = 'v_name';

select * from sys.extended_properties
where major_id=66815300

--为字段添加注释
--Eg. execute sp_addextendedproperty 'MS_Description','字段备注信息','user','dbo','table','字段所属的表名','column','添加注释的字段名';
execute sp_addextendedproperty 'MS_Description','add by liyc. 诊断类别码','user','dbo','table','DiagRecord','column','DiagTypeCode';
 
--修改字段注释
execute sp_updateextendedproperty 'MS_Description','add by liyc.','user','dbo','table','DiagRecord','column','DiagTypeCode';
 
--删除字段注释
execute sp_dropextendedproperty 'MS_Description','user','dbo','table','DiagRecord','column','DiagTypeCode';
 
-- 添加表注释
execute sp_addextendedproperty 'MS_Description','诊断记录文件','user','dbo','table','DiagRecord',null,null;
 
-- 修改表注释
execute sp_updateextendedproperty 'MS_Description','诊断记录文件1','user','dbo','table','DiagRecord',null,null;
 
-- 删除表注释
execute sp_dropextendedproperty 'MS_Description','user','dbo','table','DiagRecord',null,null;
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查询文档

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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   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='TableName'         --如果只查询指定表,加上此条件
order   by   a.id,a.colorder
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--sql server 查询所有表名及注释
SELECT DISTINCT
    d.name,
    f.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
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查询数据库中所有表的注释

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select a.TABLE_NAME,b.Description from 
(SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE') a 
join 
(
      SELECT 
    name AS TableName,
    value AS Description,
    major_id
FROM 
    sys.extended_properties
WHERE 
    minor_id = 0 AND 
    class = 1) b
on b.major_id = OBJECT_ID(a.TABLE_NAME) 
order by TABLE_NAME
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查询数据库文档

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declare @tablename_mask varchar(50)
set @tablename_mask='表名'
declare @tableid int
print @tablename_mask
select @tableid=id
from sysobjects
where type in ('U' ,'S')
and name like @tablename_mask
print @tableid

select  ROW_NUMBER() OVER(order by a.name) 序号,b.column_description 名称,a.name 属性,a.typeName 类型,a.typeLen 描述 from 
(
select C.name,UPPER(D.name) typeName, 
(case when (D.name='nvarchar' or D.name='varchar') and C.length=-1 then 'max' 
when D.name='nvarchar' then cast((C.length/2) as varchar(50)) when D.name='varchar' then cast(C.length as varchar(50)) else '' end) typeLen
from syscolumns C join sys.types D on C.xtype=D.system_type_id
where C.id = @tableid
and C.type <> 37 and D.name<>'sysname'
) a join 
(SELECT  A.name AS table_name, B.name AS column_name, C.value AS column_description 
FROM sys.tables A  
INNER JOIN sys.columns B ON B.object_id = A.object_id  
LEFT JOIN sys.extended_properties C ON C.major_id = B.object_id AND C.minor_id = B.column_id 
WHERE A.name = '表名') b
on a.name=b.column_name
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 下面为另一种写法:

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SELECT 
    c.name AS COLUMN_NAME,                         -- 字段名
    t.name AS DATA_TYPE,                           -- 字段类型
    c.max_length AS CHARACTER_MAXIMUM_LENGTH,      -- 字段长度
    ep.value AS COLUMN_DESCRIPTION                 -- 字段说明/注释
FROM 
    sys.columns c
JOIN 
    sys.types t ON c.user_type_id = t.user_type_id
LEFT JOIN 
    sys.extended_properties ep ON c.object_id = ep.major_id 
                                 AND c.column_id = ep.minor_id 
                                 AND ep.name = 'MS_Description'
WHERE 
    c.object_id = OBJECT_ID('表名'); 
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查看表名及注释

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SELECT 
    t.TABLE_SCHEMA,
    t.TABLE_NAME,
    ep.value AS TABLE_DESCRIPTION
FROM 
    INFORMATION_SCHEMA.TABLES t
LEFT JOIN 
    sys.extended_properties ep
ON 
    ep.major_id = OBJECT_ID(t.TABLE_SCHEMA + '.' + t.TABLE_NAME)
    AND ep.minor_id = 0
    AND ep.name = 'MS_Description'
WHERE 
    t.TABLE_TYPE = 'BASE TABLE'
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