Databases
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    <p>Your problem isn't really a database problem but rather an issue of how to support multiple clients and their requirements in a single program.</p> <p>The first thing you need to decide is whether multiple clients will be supported within a single instance of your program, or whether each client will have their own instance.</p> <p>If each client has their own instance, then you can maintain the common codebase separately and customize each client's instance as required. It may take some planning to produce a system in which changes made to the common codebase are correctly inherited by the customized versions, but in the end each client will get <em>exactly</em> what they want.</p> <p>If you're taking the multi-tenanted approach then you need to decide <em>in advance</em> the exact degree to which each client will be able to customize their system. You then provide for that customization in your database and application structure. At the simplest level, this allows each client to store their identifying information and a logo in a table someplace (possibly their own CSS link to really give the application a customized look).</p> <p>In the case of "extra fields", this can be handled in several ways. One is to simply put 10 extra VARCHAR fields on the table in question, and allow each client to "name" these fields as they see fit (possibly with TYPE specifiers that your application will use to coerce the VARCHAR data if needed). However many of the columns they've named are shown (with the correct prompt) where appropriate in the user interface. This approach has the benefit that, once set up, you won't have any additional work to do per client.</p> <p>Another approach would be to allow each client to have an additional 1 to 1 related table that stores the extra fields. In this case you can correctly name and type the fields in the database. The disadvantage is that to the extent you allow the client to freely choose what these fields are, you'll have to modify your user interface to "know" about each individual client.</p>
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    1. POStoring "irregular" data in MySQL
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    1. USLarry Lustig
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    1. CO"The first thing you need to decide is whether multiple clients will be supported within a single instance of your program, or whether each client will have their own instance." This is something I've discussed with the client, just in case the requirements of customers (the clients) needs exceed what the application is sensibly capable of supporting.
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      1. USWayne Smallman
    2. COWell proper version control can really help keeping these applications in sync. Pick an SCM that is great at merging
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      1. USEvert
 

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