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Check that database entry exists?


Moron

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I'm working on an employee leave program. The employee puts the employee number in and all sorts of wonderful things happen!  :o

But..... if they put in an invalid (nonexistent) employee number or just some gobbledegook, how can I give them a nice, clean "invalid entry" notice as opposed to SQL errors all over the page?
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Do a SELECT from database using their empl. number and then check the number of database rows returned from the query result (use mysql_num_rows). If the number of rows returned isn't 1, then their emp. number wasn't found.
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