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POHow to create dynamic 'types' in database
 

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  1. POHow to create dynamic 'types' in database
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    <p>My question relates to a php website with a mysql database. </p> <p>Currently in the database we have a 'token' entity</p> <p>a token can hold 0 or more 'object' entities and each of these objects can be of type x, y, z</p> <p>so</p> <pre><code>---------- | Token | |--------| -------------- |token_object| | | |tokenID | |objectID | -------------- ------------ | object | | | |objectType| ------------ ------------ --------- --------- | objectX | |objectY| |objectZ| | | | | | | ------------ --------- --------- </code></pre> <p>Now this works okish, because when I want the data from an object which, due to the nature of our caching system, is almost always one object at the time I can just make two queries to get the data from object and objectX/Y/Z</p> <pre><code>(SELECT * FROM object WHERE id = $id) </code></pre> <p>and</p> <pre><code>switch($objectType) case 'objectX': SELECT * from ObjectX WHERE id = $id case 'objectY': etc etc.. </code></pre> <p>But now I've been asked to allow users of the website to create new object types, ie objectA/B etc.</p> <p>I could just create a new objectXn table for each new object type, and by choosing a good value for objectType that would work</p> <pre><code>(SELECT * FROM $objectType WHERE blabla) </code></pre> <p>but that doesn't seem to be a very clean solution, especially the creation of new tables</p> <p>Are there any better solutions?</p> <p>Worth noting is that I expect that there are a lot of objects relative to tokens and that the creation of extra object types won't happen a lot/almost never</p>
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    1. USMatt
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    1. COI'm removing the PHP tag from this. Although you implement your solution in PHP, the heart of the question is in reference to MySQL and, as such, the PHP doesn't belong .
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    2. CODo the object tables all have the same fields? Er wait, no, I think I see -- object has the fields common to all objects and objectX has the fields unique to X?
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      1. USAlex Howansky
 

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