我在.net 4.0中使用SqlDataReader
Dim wSQL = "Select (LastName + N',b' + FistName) as CustomerName from Customers"
Dim wSQLDataReader as SQLDataReader = wSQLConnection.ExecuteReader(wSQL)
[我使用字母b
表示空格字符。]
我收到的结果如'SmithN,bJohn'
如果我在wSQL字符串中省略了N限定符,我会得到相同的结果。
如果wSQL
字符串更改为
"Select (LastName + N',bb' + FistName) as CustomerName from Customers"
(逗号后面有两个空格)。
我得到带有两个空格的结果'Smith,bbJohn'
(当然),但N
已经消失。
这是一个已知的.Net错误吗?有没有已知的工作来避免额外的空间?
上述select
语句在SQL Server Management Studio中运行良好。
答案 0 :(得分:0)
尝试在N ..之前删除+符号。您可能还需要LastName之后的逗号..喜欢这个:
Dim wSQL = "Select (LastName N',b' + FistName) as CustomerName from Customers"
Dim wSQLDataReader as SQLDataReader = wSQLConnection.ExecuteReader(wSQL)
我有一个类似的查询(但更复杂)也许它会帮助你:
SELECT
'All Users' as QuestionOption,
Stuff( (SELECT N'; ' + email FROM users where email>=' ' FOR XML PATH(''),TYPE)
.value('text()[1]','nvarchar(max)'),1,2,N'') as QuestionOptionValue
它可能看起来像:
Dim wSQL = "Select 'CustomerName' as CustomerName, Stuff( (SELECT LastName N', ' + FirstName FROM CustomerName FOR XML PATH(''),TYPE).value('text()[1]','nvarchar(max)'),1,2,N'') as Customer_Full_Name