# Abstraction Layers

- DBA — Database (dbm-style) Abstraction Layer
  - Introduction
  - Installing/Configuring
  - Predefined Constants
  - Examples
  - DBA Functions
- dbx
  - Introduction
  - Installing/Configuring
  - Predefined Constants
  - dbx Functions
- ODBC — ODBC (Unified)
  - Introduction
  - Installing/Configuring
  - Predefined Constants
  - ODBC Functions
- PDO — PHP Data Objects
  - Introduction
  - Installing/Configuring
  - Predefined Constants
  - Connections and Connection management
  - Transactions and auto-commit
  - Prepared statements and stored procedures
  - Errors and error handling
  - Large Objects (LOBs)
  - PDO — The PDO class
  - PDOStatement — The PDOStatement class
  - PDOException — The PDOException class
  - PDO Drivers