sql server中sql語句中單引號轉義

sql server有兩個轉義符:
' 默認情況下, '是字符串的邊界符, 如果在字符串中包含', 則必須使用兩個', 第1個'就是轉義符


另一個轉義符是"

當SET QUOTED_IDENTIFIER OFF時， "是字符串邊界符， 字符串中的"必須用兩個"表示。

vb: "" <=> "
sql server 2000: ''' <=> '

eg:

declare @SearchType nvarchar(50)
declare @SearchString nvarchar(255)
declare @SearchKey nvarchar(50)
declare @SearchSql nvarchar(2000)

set @SearchType = '2'
set @SearchKey = 'd'

set @SearchString = CASE @SearchType
                            when '1' then '1 = 1'
                            when '2' then 'p.ProjectName like ''' + '%' + @searchkey + '%' + ''''
                            when '3' then 'p.ProjectCity like ''' + '%'+ @searchkey + '%' +''''
                            when '4' then 'c.CateName like ''' + '%' + @searchkey + '%' + ''''
                            when '4' then 'p.ProjectManager like ''' + '%' + @searchkey + '%' +''''
                            END

set @SearchSql = N'

SELECT p.*,datename(year,ProjectPostTime)+ '   + '''-''' + ' + datename(month,ProjectPostTime)+ '+ '''-''' + ' + datename(day,ProjectPostTime)' + ' as PostTime, m.EmpName,c.CateName FROM proProject As p ,mrBaseInf As m ,proCate c WHERE p.EmpID = m.EmpID and p.CateID = c.CateID and '

+ @SearchString

print(@SearchSql)

exec(@SearchSql)