维护数字字典时，批量导入数据库的列注释、类型等相关信息

导出的格式形如：

use ppdai_vd;
go

SELECT  ‘ppdai_vd‘ AS 数据库名,
    a.name as ‘表名‘ ,
    isnull(e.value,‘‘) as ‘表注释‘,
    CONVERT(VARCHAR(19), a.create_date ,23) AS ‘创建时间‘,
    b.column_id as ‘字段序号‘,
    b.name as ‘字段名‘,
    ‘数据类型‘ =
      case
       when c.name IN (‘varchar‘,‘nvarchar‘,‘varbinary‘) and b.max_length =-1
       then c.name +‘(max)‘
       when c.name in (‘varchar‘,‘nvarchar‘,‘char‘,‘nchar‘,‘binary‘,‘varbinary‘) and b.max_length>0
       then c.name +‘(‘+CAST(b.max_length AS VARCHAR)+‘)‘
        else c.name
       end

    ,isnull(d.[value],‘‘) as ‘字段注释‘

FROM  sys.objects a
inner join  sys.columns b on  a.object_id=b.object_id and a.type=‘U‘
left join   sys.types c   on  b.user_type_id = c.user_type_id
left join   sys.extended_properties d on b.object_id=d.major_id and b.column_id=d.minor_id
left join   sys.extended_properties e on a.object_id =e.major_id and e.minor_id=0
--where a.object_id = object_id(‘user‘)
order by a.name,b.column_id

维护数字字典时，批量导入数据库的列注释、类型等相关信息