Category Archives: LINQ

JDO 3.2 JDOQLTypedQuery : improvements relative to DN extension

Now that JDO 3.2 standardises the “typed query” mechanism that we prototyped in DataNucleus v3.x and v4.0/v4.1 it is worth mentioning the additions to the API that are present in the JDO 3.2 variant. StringExpression This has gained the following … Continue reading

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JDO Typesafe .vs. JPA Criteria

JPA2 introduced its “Criteria” queries, providing an API for typesafe query generation without the need to hardcode field names etc in queries; it built on the approach of Hibernate Criteria. DataNucleus includes a proposal for JDO “Typesafe” queries. It takes … Continue reading

Posted in Criteria, JDO, JDOQL, JPA, LINQ, Typesafe | 9 Comments

JDO Typesafe Queries : Part 3 – Examples

In two previous blog posts, we introduced the idea of having a typesafe refactor friendly API for queries for JDO, and then described typical expression types necessary to achieve that. In this blog post we take that a step further, … Continue reading

Posted in JDO, JDOQL, JPA, LINQ, Typesafe | 15 Comments