protected function SqlContentEntityStorageSchema::getFieldSchemaIdentifierName

protected SqlContentEntityStorageSchema::getFieldSchemaIdentifierName($entity_type_id, $field_name, $key = NULL)

Generates a safe schema identifier (name of an index, column name etc.).

Parameters

string $entity_type_id: The ID of the entity type.

string $field_name: The name of the field.

string|null $key: (optional) A further key to append to the name.

Return value

string The field identifier name.

File

core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchema.php, line 716

Class

SqlContentEntityStorageSchema

Defines a schema handler that supports revisionable, translatable entities.

Namespace

Drupal\Core\Entity\Sql

Code

protected function getFieldSchemaIdentifierName($entity_type_id, $field_name, $key = NULL) {
  $real_key = isset($key) ? "{$entity_type_id}_field__{$field_name}__{$key}" : "{$entity_type_id}_field__{$field_name}";
  // Limit the string to 48 characters, keeping a 16 characters margin for db
  // prefixes.
  if (strlen($real_key) > 48) {
    // Use a shorter separator, a truncated entity_type, and a hash of the
    // field name.
    // Truncate to the same length for the current and revision tables.
    $entity_type = substr($entity_type_id, 0, 36);
    $field_hash = substr(hash('sha256', $real_key), 0, 10);
    $real_key = $entity_type . '__' . $field_hash;
  }
  return $real_key;
}