| Name | Description |
|---|---|
| Database abstraction layer | Allow the use of different database servers using the same code base. |
| Name | Location | Description |
|---|---|---|
| db_column_exists | drupal/includes/database/database.inc | Check if a column exists in the given table. |
| db_last_insert_id | drupal/includes/database/database.inc | Returns the last insert id. |
| db_table_exists | drupal/includes/database/database.inc | Check if a table exists. |
| file_load | drupal/includes/file.inc | Load a file object from the database. |
| node_load | drupal/modules/node/node.module | Load a node object from the database. |