How to resolve this Error

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SQL-Server-2008

C#

string query = string.Format( "Select {0}.{1},{2},{3}, {9}.{4},{5},{6} ,{7},{8} From {0} ;

i got this error Syntax error in string in query expression '(Mid(AttendanceLogs.InTime,EmployeeId,0) = Mid(Format(DateAdd(AttendanceDate,-4, NOW()), 'YYY-mm-dd),EmployeeId,0))'.

Posted 5-Nov-12 19:36pm

2011999

Updated 5-Nov-12 20:43pm

v2

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Solution 2

Hi There,

I think you are trying to use MID as function.
If this is true, there are couple of problems I assume.

1. MID is function to find a substring from a coulmn. The way you have used doesn't seem right. The syntax for MID is

SQL

SELECT MID(column_name,start[,length]) FROM table_name

2. MID I think is not available in SQL 2008. It was/is there in Access. You can use substring method in SQL 2008. The syntax for the substring is same

SQL

SELECT substring(column_name,start[,length]) FROM table_name

In both cases length is an optional parameter.

Hope that helps
Milind

Posted 5-Nov-12 19:53pm

MT_

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Sergey Alexandrovich Kryukov · Accepted Answer · 2012-11-05T19:47:00

The whole idea is wrong in principle. Your data you use for composing the query may come from UI, and anything can come, including… some SQL code fragments. This simple idea is the base of the well-known exploit called "SQL Injection". You cannot afford this to happen.

Please see: http://en.wikipedia.org/wiki/SQL_injection[^].

Please see this article and pay attention for the section "Parametrized statement". Even all aspects of the exploit and its mitigation can be very complex (I recently saw a whole thick book on this single topic), parametrized statements is a principle way fighting the problem.

This is how it looks in ADO.NET:
http://msdn.microsoft.com/en-us/library/yy6y35y8.aspx[^],
http://msdn.microsoft.com/en-us/library/ms254953.aspx[^].

Good luck, stay safe,

—SA