The update system is used by modules to provide database updates which are run with update.php.
Implementations of these hooks should be placed in a mymodule.install file in the same directory as mymodule.module.

Functions & methods

hook_disablePerform necessary actions before module is disabled.
hook_enablePerform necessary actions after module is enabled.
hook_installInstall the current version of the database schema, and any other setup tasks.
hook_requirementsCheck installation requirements and do status reporting.
hook_schemaDefine the current version of the database schema.
hook_uninstallRemove any information that the module sets.
hook_update_last_removedReturn a number which is no longer available as hook_update_N().
hook_update_NPerform a single update.
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