在数据库中写查询语句的时候，把float转成字符串

select p.bracketName as pbracketname,p.paraid as pparaid
,va= case c.paratype
when 0 then  cast(patavalue as varchar)    //原来是数字类型，现在转成字符串类型
when 1 then parastring
end
from t_ParaUserBracket as p
inner join t_ArtificiallyData as a on p.paraid=a.paraid
inner join dbo.t_ParaInformation as i on i.id=p.paraid
inner join dbo.t_ParaClass as c on c.id=i.ParaClassID
where PointTime='1900-1-1 0:00:00'