About Transaction

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Manual
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Setting and Tuning of JPA Queries

em can be visible to anyone who uses em, even before committing the transaction (but not to users
Manual
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SELECT clause (JPQL / Criteria API)

are not associated with an EntityManager and changes to them when a transaction is active are not
FAQ
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What is ObjectDB?

ObjectDB is an Object Oriented Database Management System (ODBMS). It provides all the standard database management services (storage and retrieval, transactions, lock management, query processing, etc.), but it uses an object oriented model to store and manage data. You can easily store ordinary
Tutorial
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Step 1: Create a Maven Web Project

>      javax.transaction    jta    1.1
Tutorial
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Step 4: Add a Servlet Class

the page output. Finally, the database connection (including the transaction if still active) is closed
Manual
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Retrieving JPA Entity Objects

The Java Persistence API (JPA) provides various ways to retrieve objects from the database. The retrieval of objects does not require an active transaction because it does not change the content of the database. The persistence context serves as a cache of retrieved entity objects. If a requested
Result
7

About ObjectDB Database

ObjectDB Object Database ObjectDB is a powerful Object-Oriented Database Management System (ODBMS). It is compact, reliable, easy to use and extremely fast. ObjectDB provides all the standard database management services (storage and retrieval, transactions, lock management, query processing
Result
7

About ObjectDB Database [2017-10-24]

ObjectDB Object Database ObjectDB is a powerful Object-Oriented Database Management System (ODBMS). It is compact, reliable, easy to use and extremely fast. ObjectDB provides all the standard database management services (storage and retrieval, transactions, lock management, query processing
Tutorial
7

Step 2: Entity Class and Persistence Unit

/persistence_2_0.xsd"> transaction-type="JTA"> com
Tutorial
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Step 4: Add a Servlet Class

the transaction if still active) is closed. The next step is adding a JSP page that will produce the guestbook page output.