MSSQL 元数据操作

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MSSQL 查询所有的表名、字段名、注释

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='orders'         --如果只查询指定表,加上此条件
order   by   a.id,a.colorder

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MySQL 安装

1. 下载绿色包 mysql 8 http://www.downcc.com/soft/395536.html
2. 配置环境变量 MYSQL_HOME = mysql解压的路径 PATH = %MYSQL_HOME%\bin
3. 创建 bin\my.ini 文件，复制下面的内容

   
   [client] 
   port=3306 
   default-character-set=utf8 

[mysqld] port=3306 character_set_server=utf8 basedir=%MYSQL_HOME% datadir=%MYSQL_HOME%\data

[WinMySQLAdmin] %MYSQL_HOME%\bin\mysqld.exe

4. 命令行初始化数据库
mysqld -install
mysqld --initialize-insecure
net start mysql
mysqladmin -u root -p password -- 此处敲3次回车
mysql -i root -p
5. 没有了