how to sql inject or attack

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How does sql injection or attack done.? example code

How can sql injection done in the code below?

VB

olesql = "insert into table (rr_colums) values ('" & sum & "')"
                Dim olecmd As New OleDb.OleDbCommand
                olecmd.CommandText = olesql
                olecmd.Connection = oleconn
                olecmd.ExecuteNonQuery()
                olecmd.Dispose()

Posted 4-Nov-11 0:57am

renc

Updated 4-Nov-11 0:58am

RaisKazi

v2

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2 solutions

Solution 1

Check these links

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

http://www.unixwiz.net/techtips/sql-injection.html[^]

http://www.programmerinterview.com/index.php/database-sql/sql-injection-example/[^]

Posted 4-Nov-11 1:01am

P.Salini

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RaisKazi · Accepted Answer · 2011-11-04T01:04:00

It depends from where value of your sum variable has been initialized.

Generally in case when values from user-input controls like "Textbox" are concatenated to plain SQL Queries then it increases the possibility of threat of "SQL Injection".

Have a look at below links for more information.
http://msdn.microsoft.com/en-us/library/ms161953.aspx

http://msdn.microsoft.com/en-us/library/ff648339.aspx