SQL中附近的语法不正确

Question

I spend lot of time to figure out, what is the error,

l have code like this.

DECLARE @GeofenceName nvarchar(50) = '';
DECLARE @sql AS NVARCHAR(MAX)

SET @sql = N'select * from GeofenceMaster where GeofenceName = GName'

EXEC sp_executesql @sql,N'GName nvarchar(50)',@GeofenceName

PRINT @sql

it throw a error like this.

Msg 102, Level 15, State 1, Line 1 Incorrect syntax near 'GName'. select * from GeofenceMaster where GeofenceName = GName

anybody know which cause this problem?

Answer 1

UPDATE :

The original answer is incorrect. No parentheses should be required. See http://msdn.microsoft.com/en-us/library/ms188001(v=sql.105).aspx

New answer

Try

DECLARE @GeofenceName nvarchar(50) = '';

DECLARE @sql AS NVARCHAR(MAX)

set @sql = N'select * from GeofenceMaster where GeofenceName = @GName'

EXEC sp_executesql @sql,N'GName nvarchar(50)',@GName=@GeofenceName

I've amended the SQL itself, ... = GName becomes ... = @GName and the execution, ..., @GeofenceName becomes ..., @GName = @GeofenceName .

Original answer

You need to add some brackets.

Instead of

EXEC sp_executesql @sql,N'GName nvarchar(50)',@GeofenceName

Try

EXEC sp_executesql(@sql,N'GName nvarchar(50)',@GeofenceName)

Answer 2

the problem is in the variable "GName" (should have @, in this case would @GName), try with the following code, this works perfectly (for more info, see this LINK ):

DECLARE @sql AS NVARCHAR(MAX)
declare @GName AS nvarchar(50) = ''

SET @sql = N'select * from GeofenceMaster where GeofenceName = ''' + @GName + ''''

EXEC sp_executesql @sql,N'@GName nvarchar(50)',GName

PRINT @sql