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# Database Abstraction Layer

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##### Resources

- Reference Manual
- User Guide
- The Data Dictionary
- ADOdb-xmlschema
- ADOdb Active Record
- Performance Monitoring
- Date/Time Library
- Session Management Library
- Unsupported Addons
- Coding Standards

##### Supported Databases

- Access
- ADO
- CSV
- Firebird
- Frontbase
- IBM DB2
- Informix
- Interbase
- LDAP
- Microsoft SQL Server
- MySQL
- Netezza
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- Postgresql
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- Plain Text
- Visual Foxpro

##### Other

- Feature Comparison Matrix
- Connection Matrix
- Include File Guide

v5:session:version1

# Upgrading From V1 ADOdb Session Handling

## The Improved Session Handler

In ADOdb 4.91, we added a new session handler, in adodb-session2.php. It features the following improvements:

- Fully supports server farms using a new database table format. The previous version used the web server time for timestamps, which can cause problems on a system with multiple web servers with possibly inconsistent times.
- The new version uses the database server time instead for all timestamps.
- The older database table format is obsolete. The database table must be modified to support storage of the database server time mentioned above.
- Also the field named DATA has been changed to SESSDATA. In some databases, DATA is a reserved word.
- The functions `dataFieldName()` are `syncSeconds()` are obsolete.

v5/session/version1.txt · Last modified: 2016/01/12 16:57 by mnewnham

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