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I've been studying OJS 2.1. code and am trying to figure out how Model Classes get their unique ID's. For example, Article::setArticleId is given an id and sets the parent Data Object accordingly. However, where is the unique articleID that is given to Article::setArticleID created and what mechanism ensures that it is unique (I'd assume that assurance that its unique can only come from DB layer rather than application layer?
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You are correct in assuming that this mechanism is done at the database level--The article ID is the primary key for the articles table and is auto-incremented after every insert. The setArticleId function is used to assign the article id to a PHP article object, and it gets its parameter from the database.
Hope that clears things up a bit,
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