Apache Persistence Layers

Cayenne, OpenJPA, iBatis Apache Persistence Layers ApacheCon EU 2008 Henning Schmiedehausen [email_address]

The O/R impedance mismatch Objects (Java Knowledge) RDBMS ?

In a nutshell… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Selection criterias ,[object Object],[object Object],[object Object]

Can we stop here? I just need to query data for my (web) application. I could use the “industry standard”, right?

Yeah, right ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Meanwhile, outside Apache… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Because we are at ApacheCon…

[object Object],[object Object],[object Object],[object Object]

Apache Persistence Layers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Common Ground ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Where are we? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object]

Cayenne ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example code ,[object Object],[object Object],[object Object],[object Object]

Cayenne property ,[object Object],[object Object],[object Object],[object Object],[object Object]

Cayenne relation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Cayenne mapping ,[object Object],[object Object],[object Object],[object Object],Class/DB Map Prop. / Col Map Obj Relation

OpenJPA property ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Class/DB Map Prop. / Col Map

OpenJPA relation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Class/DB Map Obj Relation

Accessing the Mapper ,[object Object],[object Object],[object Object],[object Object],[object Object]

Retrieving an Object by PK ,[object Object],[object Object],[object Object],[object Object]

Changing an Object ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

And Now… …for Something Completely Different

iBATIS ,[object Object],[object Object],[object Object],[object Object]

iBATIS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A mapped query ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Query examples ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Caveat ,[object Object],[object Object],[object Object],[object Object]

Which one to use? ,[object Object],… when standards compliance is a concern OpenJPA … if you need J2EE integration All of them … if your SQL is better than your Java / .NET iBATIS … if your Java is better than your SQL Cayenne, OpenJPA When What

Where to go from here? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Apache Persistence Layers

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Apache Persistence Layers