Towards 3.0: further enhancement of the RDF store

[k00ni]

Version 2.4 is ready to be merged.

I would like to add a few features, but they break backward compatibility. Therefore a new major release is necessary.

Features in 3.0

• [x] Use InnoDB instead of MyISAM (#115) - with InnoDB we get ACID conformance and transaction support out of the box (PDO only)
• [x] Transaction support (#110) - provided by PDO when using InnoDB, but needs to be "activated". So we only need a couple of functions to tell PDO, that we want a transaction.
• [x] coupled transaction support with new cache implementation (mostly cache invalidation, if rollback)
• Check if tables can be further optimized using in INDEXES for instance

Removals (non-backward compatible changes)

ARC2_Class

• removed queryDB - because it relied on mysqli

ARC2_Store

ARC2 should handle that internally and automatically, without involving outsiders.

• removed hasFulltextIndex
• removed enableFulltextSearch
• removed disableFulltextSearch

Internal changes

• DB adapters will return DBS version from now on as: xx.yy.zz instead of xx-yy-zz.

Current state lives in branch 3.0: https://github.com/semsol/arc2/tree/3.0

What do you guys think?

[k00ni]

Update

Transaction support implemented. Even nested transactions are possible. Handling of transactions is done by the adapter. If a connection gets closed/removed before all transactions were commited, it automatically rolls back. Further information about transactions with PDO can be found here: http://php.net/manual/en/pdo.transactions.php