A density lemma

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Keep in mind, though, that missing repositories will cause errors. Java SE and MongoDB—the Hello World Example We’ll start our series of applications with an exception: the first application won’t involve Hibernate OGM. This application is actually just a quick test to make sure that the MongoDB server is running and responds to a connection attempt. Consider this our Hello World application for Java-MongoDB novices. You can skip it if you think it’s a waste of your time. Otherwise, let’s go! This is the simplest Java SE/MongoDB example ever—it simply stores a random number into a MongoDB collection.

MongoDB does better with regard to consistency and durability. MongoDB write operations can be made consistent across connections. Moreover, MongoDB supports near-real-time replication, so it’s possible to ensure an operation has been replicated before returning. Hibernate OGM mitigates MongoDB’s lack of support for transactions by queuing all changes before applying them during flush time. Even though MongoDB doesn’t support transactions, Hibernate OGM recommends using transaction demarcations to trigger the flush operation transparently (on commit).

Ogm. store configuration property to the value COLLECTION. ■■Note Based on this example, you can easily intuit how the associations are represented in one-to-one, one-to-many, and many-to-one cases. Keep in mind that collections and field names can be altered by JPA annotations, like @Column, @Table, @JoinTable and so on. The example I presented doesn’t use such annotations. From the JPA perspective, when a bidirectional association doesn’t define the owning side (using the mappedBy element), Hibernate OGM considers each side to be an individual association.

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