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The hacker may proceed with this query string designed to reveal the version number of My SQL running on the server: , which would show the book review on a server running My SQL 4 and a blank or error page otherwise.The hacker can continue to use code within query strings to glean more information from the server until another avenue of attack is discovered or his or her goals are achieved.

For example: It is clear from this statement that the author intended a_variable to be a number correlating to the "id" field.In many cases, the SQL statement is fixed, and each parameter is a scalar, not a table.The user input is then assigned (bound) to a parameter.However, if it is in fact a string then the end-user may manipulate the statement as they choose, thereby bypassing the need for escape characters.For example, setting a_variable to Blind SQL Injection is used when a web application is vulnerable to an SQL injection but the results of the injection are not visible to the attacker.

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