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JPA

Query Structure Criteria

JPA

JPA Introduction Mismatches between relational and object models What is JPA? JPA Architecture JPA ORM Components ORM Architecture Persistence Operations JPA Entity Relationships Query Structure Criteria

Query Structure Criteria

< JPA Entity Relationships

The API and JPQL criteria are closely connected and can be designed using similar operators. It is used to create a query after javax.persistence.criteria. The query structure refers to the query for syntax criteria.

Creating Entities

  • Create a package ‘com.world.EclipseLink.entity’ under ‘src’ set. Make a new java class named scholar.java under the specified package.

Persistence.xml

Persistence.xml file has the structure information of database and registration data of entity classes. Persitence.xml will be built by the eclipse IDE during the creation of a JPA Project. The configuration aspects are user stipulations.

Service Classes

This module includes the classes of services that use the MetaData API initialisation property to implement the query part. Create a 'src' package called 'com.world.EclipseLink.service' package. Under the given package class named CriteriaAPI.java.

After the accumulation and working of the program, you will be notified in the console panel of Eclipse IDE. Check MySQL workbench for output.

Conclusion

We have seen a high-level overview of a Java Persistence API in this tutorial. Any application dealing with a database should define an application layer with the primary aim of segregating persistent code. The Java Persistence API presents a range of capabilities and supports the persistence of the Java object. The overhead of the framework configuration may not be required for all of the JPA capabilities for simple applications. But the structure and encapsulation of JPA truly earn its retention as an application progresses; using JPA, you can keep your object code concise and offers a smooth framework for Java programmes to access data. Hopefully, this article will benefit you to know why JPA(Java Persistence API) is reliable and help you to decide to use it or not.

< JPA Entity Relationships

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JPA Introduction Mismatches between relational and object models What is JPA? JPA Architecture JPA ORM Components ORM Architecture Persistence Operations JPA Entity Relationships Query Structure Criteria
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