To add a database in an update hook (may you not have to do that much) it appears you must borrow from the innards of drupal_install_schema().
See http://drupal.org/node/150215
In linkoutreadmore.install,
<?php
/**
* Implements hook_update_N().
*/
function linkoutreadmore_update_7001() {
// See http://drupal.org/node/150220
$schema['linkoutreadmore'] = array(
'description' => 'A list of nodes which use a link URL for the Read More destination.',
'fields' => array(
'nid' => array(
'description' => 'The node ID.',
'type' => 'int',
'unsigned' => TRUE,
'not null' => TRUE,
),
'field_name' => array(
'type' => 'varchar',
'length' => 32,
'not null' => TRUE,
'description' => 'The name of the link field.',
),
),
'primary key' => array('nid'),
);
db_create_table('linkoutreadmore', $schema['linkoutreadmore']);
}
/**
* Implements hook_schema().
*/
function linkoutreadmore_schema() {
$schema['linkoutreadmore'] = array(
'description' => 'A list of nodes which use a link URL for the Read More destination.',
'fields' => array(
'nid' => array(
'description' => 'The node ID.',
'type' => 'int',
'unsigned' => TRUE,
'not null' => TRUE,
),
'field_name' => array(
'type' => 'varchar',
'length' => 32,
'not null' => TRUE,
'description' => 'The name of the link field.',
),
),
'primary key' => array('nid'),
);
return
$schema;
}
?>