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Prozak

MySQL Query Sync Question/ Issue

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I'm build a small website, and this issue has plagued my mind. I have the following steps: 1) Check if a certain item already exists in the DB 2) If not, then insert new item As you can guess, between steps 1 and 2, there might be some other thread running the same query, and both run step 1, and in truth there is no such item on the DB, and then both execute step 2, inserting 2 equal items on the DB, and therefore currupting it's contents with invalid data... How can I solve this issue between multiple threads running on the server? (I'm using wamp: windows, apache, php4 and mysql). Thanks for any tips on this.

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The EXISTS clause (or rather, NOT EXISTS) will allow you to make it a single query.

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