The Database Class
CodeIgniter comes with a full-featured and very fast abstracted database class that supports both traditional structures and Active Record patterns. The database functions offer clear, simple syntax.
- Quick Start: Usage Examples
 - Database Configuration
 - Connecting to a Database
 - Running Queries
 - Generating Query Results
 - Query Helper Functions
 - Active Record Class
 - Transactions
 - Table MetaData
 - Field MetaData
 - Custom Function Calls
 - Query Caching
 - Database manipulation with Database Forge
 - Database Utilities Class