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combined index not used

.query-plan-text", "ObjectNode[set]"); This tells ObjectDB to prefer a query plan that uses the "ObjectNode[set]" element (included in the query plan XML representation). In the case of the query from ... -text=ObjectNode[set]]] You can also automate the selection and add to your application code
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Database Transaction Replayer

on a different physical device by setting the path attribute in the configuration. The recording directory
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FROM clause (JPQL / Criteria API)

, NOT, NULL, NULLIF, OBJECT, OF, OR, ORDER, OUTER, POSITION, SELECT, SET, SIZE, SOME, SQRT, SUBSTRING
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JPA Annotations for Fields

The way a field of a persistable class is managed by JPA can be set by the following annotations: Additional annotations (and enum) are designated for enum fields: Other additional annotations (and enum) are designated for date and calendar fields: Chapter 2 of the ObjectDB manual explains how to use all the above annotations.
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Step 2: Entity Class and Persistence Unit

entity class will represents guests in the database. We also need to configure JPA by setting a META-INF
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Step 1: Create a Maven Web Project

copy and paste to replace its content with the following settings: <project xmlns="http://maven
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Step 1: Create a Java Project

qualified class name is set (you may use copy & paste). Click the Finish button to create
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Step 1: Create a Maven Web Project

and use copy and paste to replace its content with the following settings: <project xmlns="http
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Step 2: Entity Class and Persistence Unit

+ ")"; } } A default JPA persistence unit (with default settings) was generated in a persistence.xml
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JDO Annotations for Classes

JDO supports two modes of persistable classes that can be set by the following annotations: Non persistable classes that should be enhanced (because of accessing persistent fields of other classes directly) can be marked with: The identity mode of persistence capable classes can be specified by using:

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.

Need Help?

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