/**
* Act on creation of a new field.
*
* This hook is invoked from field_create_field() to ask the field storage
* module to save field information and prepare for storing field instances.
* If there is a problem, the field storage module should throw an exception.
*
* @param $field
* The field structure being created.
*/
function hook_field_storage_create_field($field)
{
$schema = _field_sql_storage_schema($field);
foreach ($schema as $name => $table) {
db_create_table($name, $table);
}
drupal_get_schema(NULL, TRUE);
}
/**
* Update the storage information for a field.
*
* This is invoked on the field's storage module from field_update_field(),
* before the new field information is saved to the database. The field storage
* module should update its storage tables to agree with the new field
* information. If there is a problem, the field storage module should throw an
* exception.
*
* @param $field
* The updated field structure to be saved.
* @param $prior_field
* The previously-saved field structure.
* @param $has_data
* TRUE if the field has data in storage currently.
*/
function hook_field_storage_update_field($field, $prior_field, $has_data)
{
if (!$has_data) {
// There is no data. Re-create the tables completely.
$prior_schema = _field_sql_storage_schema($prior_field);
foreach ($prior_schema as $name => $table) {
db_drop_table($name, $table);
}
$schema = _field_sql_storage_schema($field);
foreach ($schema as $name => $table) {
db_create_table($name, $table);
}
} else {
// There is data. See field_sql_storage_field_storage_update_field() for
// an example of what to do to modify the schema in place, preserving the
// old data as much as possible.
}
drupal_get_schema(NULL, TRUE);
}
