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Conceptual Overview
Data Access Interfaces
Virtual Database Engine
SQL Reference
Virtuoso Cluster Programming
SQL Procedure Language Guide
Database Event Hooks
Database Startup
Database Connections
Database Logins
Database Disconnections
Database Shutdown
SQL Statement Preparation
SQL Parse Tree
WebDAV Logins
Associating Auxiliary Data With A Connection
Data Replication, Synchronization and Transformation Services
Web Application Development
XML Support
RDF Data Access and Data Management
Web Services
Runtime Hosting
Internet Services
Free Text Search
TPC C Benchmark Kit
Using Virtuoso with Tuxedo
Virtuoso Functions Guide


Virtuoso provides a number of hooks that enable you to traps events within the database such as startup, shutdown, connection, disconnection and SQL compilation events.

Table of Contents

12.1. Database Startup
12.2. Database Connections
12.3. Database Logins
12.4. Database Disconnections
12.5. Database Shutdown
12.6. SQL Statement Preparation
12.7. SQL Parse Tree
12.7.1. Notes on Special Features of the Parse Tree
12.7.2. SQL Security and Parse Trees
12.7.3. Debugging with Parse Trees
12.8. WebDAV Logins
12.9. Associating Auxiliary Data With A Connection

Virtuoso allows the dba to set hooks for various events, such as:

These events are intercepted by calling a SQL procedure if one is defined.

In the following we will examine each hook in the context of a simplified database security system. The system will record all logins and logouts and will enforce custom security rules on reading a specific application table.