Insertion without duplication in MySQL

Question

I'm fetching data from a text file or log periodically and it gets inserted in the database every time fetched. Is there a way in MySQL that the insert is only done when the log files are updated or I have to do it using the programming language ? I mean Is there a type of insert that when It sees a duplicate primary key, It doesn't give an error of "Duplicate Entry" .. It just ignore.

Answer 1

Put the fetch in a logrotate postrotate script, and fetch from the just rotated log.

Ignoring duplicates can be done with either INSERT IGNORE OR INSERT .... ON DUPLICATE KEY UPDATE syntax (which will either ignore the lines causing a duplcate unique key, or give you the possibility to alter some values in the existing row.)