[development] D6 SAPI: using hook_install to ALTER {tables}

Derek Wright drupal at dwwright.net
Thu Dec 27 10:44:59 UTC 2007

On Dec 27, 2007, at 12:15 AM, Augustin (Beginner) wrote:

> Q3) Is it considered best practice to create your own tables rather  
> than adding fields to existing tables "belonging" to other modules?

definitely!  the other module might alter the schema and your data  
could be destroyed.

for example, sometimes, the best way to add a new (computed) column  
is to create a new table with the schema you need, populate it with  
fancy SELECT logic, and then drop the old one[1].  if your contrib  
has hidden its own columns in the original table, the author of the  
schema update won't know about your columns and will blindly drop all  
your data after safely migrating their own columns to the new table.

-derek (dww)

[1] see for example, http://drupal.org/node/203313
function project_release_update_5200()

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