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132

GROUP BY and HAVING clauses

The GROUP BY clause enables grouping of query results. A JPQL query with a GROUP BY clause returns properties of generated groups instead of individual objects and fields. The position of a GROUP BY ... clause. When a GROUP BY clause exists in a JPQL query, database objects (or tuples of database objects
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ORDER BY clause (JPQL / Criteria API)

The ORDER BY clause specifies a required order for the query results. Any JPQL query that does not include an ORDER BY clause produces results in an undefined and non-deterministic order. ORDER BY ... is at least one million people, ordered by the country name: SELECT c.name FROM Country c WHERE c.population > 1000000
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Step 3: Add a Main Class

In this step we will add code to the Main class (that was generated with the project) in order to store Point objects in the database and then retrieve them from the database. Use copy and paste ... is provided in the Quick Tour chapter of the ObjectDB Manual. The next step (and the last in this tutorial) is running the project.
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Privacy Policy

the Service. By using the Service, You agree to the collection and use of information in accordance ... on Your computer, mobile device or any other device by a website, containing the details ... on behalf of the Company. It refers to third-party companies or individuals employed by the Company
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Step 2: Define a JPA Entity Class

) - the Point class is an ordinary Java class. The next step is adding to the project a Main class
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JPA Web App Tutorial - Maven Project

The JPA Web Application tutorial provides step by step instructions on how to build a simple Java ... application step by step is an effective way to learn - but if you prefer, you may download and run ... - extract the zip and run the application from the command line by: > mvn package jetty:run
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Getting Started with JPA - Maven Project

The Getting Started with JPA tutorial provides step by step instructions on how to build a simple JPA database driven application in Eclipse or NetBeans. Building a new application step by step ... and run the application from the command line by: > mvn test The current directory
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Java EE JPA Tutorial - Maven Project

The Java EE Web Application tutorial provides step by step instructions on how to build a simple Java/JPA database driven web application (for GlassFish 3/ JBoss 6) in Eclipse or NetBeans. Building a new application step by step is an effective way to learn - but if you prefer, you may download
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Spring MVC JPA Tutorial - Maven Project

The Spring MVC JPA tutorial provides step by step instructions on how to build a simple Java/JPA Spring MVC database driven web application in Eclipse or NetBeans. Building a new application step by step is an effective way to learn - but if you prefer, you may download and run the finished
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[ODB1] Chapter 6 - Persistent Objects

When a new object is constructed by the new operator, it always starts as a transient object, regardless of its type. Instances of persistent classes can become persistent later, as demonstrated by ... a simple transient object. Then it becomes persistent by an explicit call to the makePersistent

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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