O2DBIWiki/IntroFeatures

O2DBI - Introduction - O2DBI Features

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Database connectivity:

• backend modules for different database management systems (MySQL, PostgreSQL)
• generated code is independent of database system

Class design:

• arbitary complex class hierarchies (e.g. currently upto 7 levels of inheritence in EMMAWiki)
• support for different scalar datatypes (integral types, floats, boolean, strings etc.)
• support for associations between classes
• support for persistent array and hash valued attributes
• nesting of arrays and hashes for complex attributes

Generated code:

• central master module for propagating method invocations to the right class
• polymorphic queries
• object cache for faster object lookups

Extensions:

• each class may be extended with its own business methods
• extensions are inherited in the class hierarchie

Interoperability:

• multiple masters (and thus multiple databases) may be used in parallel
• different generated hierarchies can be used at the same time, no namespace clashes

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