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Eloquent Developer | Software architecture and development

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In this article we are going to retrieve nested JPA entities in a single query avoiding many database calls.

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Eloquentdeveloper.com is hosted in Germany / Frankfurt . Eloquentdeveloper.com doesn't use HTTPS protocol. Number of used technologies: 7. First technologies: CSS, Html, Html5, Number of used javascripts: 12. First javascripts: 1469658569index.js, Prototype.js, Scriptaculous.js, Number of used analytics tools: 1. First analytics tools: Google Analytics, Its server type is: Apache/2.4.6 (CentOS) PHP/5.4.16. Its CMS is: Wordpress.

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Content: Have you ever realized that many times when accessing a managed entity's attribute it's commonÂ to seeÂ JPA performingÂ many subsequent queries in the database in order to lazy load information? Well, it'sÂ a good default behavior and works inÂ the majority of the casesÂ but still sometimes we need to modify this behavior on anÂ ad hoc basis or per use case scenario. For these specific situations weÂ can use a handyÂ feature from JPA known asÂ Fetch Joins. In a very abstractÂ way we can say that theÂ Fetch Joins allow us to dynamically define which relations we want to eagerly load when making a query. In this article we are going to retrieve nested JPA entities in a single query avoiding many database calls. Example Letâ€™s consider the following example: Our system has two entities: Customer and Address. The relationship between them is a bidirectional one-to-many from Customer to Address, which means that aÂ CustomerÂ can have none or multiple instances of Address.Â These are our model classes
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