Drupal 6 module install file not creating tables i

问题:

I'm using the Schema API to create tables for my module on Drupa 6.17, but the tables just do not get created in the database. I have the Schema module installed, and it tells me that while the schema for my module is recognized, its table is not in the database. It comes up under Missing:

Tables in the schema that are not present in the database.
test
* test_table

Here are the contents for my test.install file.

<?php
// $Id$
function test_schema() {
$schema['test_table'] = array(
    'description' => t('Test table'),
    'fields' => array(
        'nid' => array(
            'description' => t('test field'),
            'type' => 'serial',
            'not null' => TRUE,
        ),
        'options' => array(
            'description' => t('other test field'),
            'type' => 'text',
            'not null' => FALSE,
        ),
    ),
    'primary key' => array('nid'),
    );
    return $schema;
}
function test_install() {
    drupal_install_schema('test');
}
function test_uninstall() {
    drupal_uninstall_schema('test');
}

回答1:

Edit:

Here is code I just wrote that works. Follow as example:

/**
 * Implementation of hook_schema().
 */

function action_alert_schema() {
 $schema['action_alert'] = array(
    'description' => 'Action Alert table.',
    'fields' => array(
   'aid' => array(
        'description' => 'The serial ID.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
   ),
      'nid' => array(
        'description' => 'The primary identifier of the node.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
   ),
      'uuid' => array(
        'description' => 'The session id of the user if the UID is not present.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '0',
      ),
   ),
    'primary key' => array('aid'),
  );

return $schema;

}

/**
 * Implementation of hook_install().
 */
function action_alert_install() {
  drupal_install_schema('action_alert');
}

/**
 * Implementation of hook_uninstall().
 */
function action_alert_uninstall() {
 drupal_uninstall_schema('action_alert');
}

回答2:

if you want to add module install after the module creation you need to remove the record from system table in your drupal db, and then enable it again.

disable your module and save

goto 'system' table and find your module there

remove that record

enable your module and save

回答3:

Drupal only runs a module's hook_install() once when you first enable the module. Unless you go through and disable, uninstall, and then re-enable the module will your module's hook_install() get called ever again.

If you had already created a release of your module and are wanting to add a schema to existing installs, you will want to add an implementation of hook_update_N() that calls db_create_table().

回答4:

I would like to share with you my experiences with this error on Drupal 6. In my first-ever module I had three tables. I had an entry for each in my hook_schema (called education_schema):

function education_schema()
{
  $schema['education_course'] = array( /* ... */ );
  $schema['education_market'] = array( /* ... */ );
  $schema['education_event'] = array( /* ... */ );
}

In my hook_install, I initially had the following:

function education_install()
{
  drupal_install_schema('education_course');
  drupal_install_schema('education_market');
  drupal_install_schema('education_event');
}

No tables were creating at module install. Why? I had no idea: no errors to be seen anywhere in the logs. Eventually I found out about the PHP extension xdebug, which, when used in education_install revealed that drupal_install_schema failed because it could not find the routines education_course_schema, education_course_market and education_course_event. At that point the solution was quite obvious:

function education_install()
{
  drupal_install_schema('education');
}

And voila, it worked!

So, I learned that drupal_install_schema does not log any error when it fails, that only one call to drupal_install_schema is required and that it installs all schemas that you return in the array, that the API documentation of drupal_install_schema is worth reading, and finally that xdebug is a very handy utility!