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SELECT clause (JPQL / Criteria API)

objects, transparent update detection, support for delete, etc. Query results are not limited to entity ... - JPQL does not support the "SELECT *" expression (which is commonly used in SQL). Projection of Path Expressions JPQL queries can also return results that are not entity objects. For example
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JPA Query Expressions (JPQL / Criteria)

: =, <>, <, <=,>, >=, IS [NOT] NULL, [NOT] BETWEEN, including Collection operators: [NOT] IN, IS [NOT] EMPTY, [NOT] MEMBER [OF] and the [NOT] LIKE operator. Logical operators: AND, OR, NOT. In addition, JPA queries ... , isMember, isNotMember, size). Comparison expressions (equal, notEqual, gt, ge, lt, le, between, isNull, ...) Logical expressions (and, or, not, isTrue).
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Privacy Policy

You. Personally identifiable information may include, but is not limited to: email address ... information automatically, including, but not limited to, the type of mobile device You use ... when a Cookie is being sent. However, if You do not accept Cookies, You may not be able to use some
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JPA Primary Key

an object database, ObjectDB supports implicit object IDs, so an explicitly defined primary key is not ... of other persistable types are always stored as part of their containing entity objects and do not ... of the second entity object is 2, etc. Primary key values are not recycled when entity objects
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Database Management Settings

when a database is opened and a recovery file exists, indicating that it has not been closed properly. Moving or copying a database file that has not been closed properly without its recovery file ... a database that has not been closed properly by running the Replayer tool. Recording might also be useful
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JPA / JDO Class Enhancer

. There is one case, however, where enhancement is required. Non persistable classes that access directly (not ... (and actually required by JPA but not enforced by ObjectDB) to avoid accessing persistent fields ... should need to be enhanced. The enhancer silently ignores any specified class that does not need
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Literals in JPQL and Criteria Queries

), a feature that is not currently supported by all JPA implementations. String Literals JPQL follows ... ", "abcd\n1234") but this is not supported by all the JPA implementations. Unlike most other JPQL components, String literals (which represent data) are case sensitive, so 'abc' and 'ABC' are not
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Shared (L2) Entity Cache

- every entity class which is not marked with @Cacheable inherits cacheability setting from its super ... automatically: On retrieval - shared cache is used for entity objects that are not in the persistence context. If an entity object is not available also in the shared cache - it is retrieved from
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javax.persistence.EntityManager

entities to become detached. Changes made to entities that have not been flushed to the database will not ... - if not an entity Since: JPA 1.0 Query createNamedQuery(String name) Create an instance of Query ... : IllegalArgumentException - if a query has not been defined with the given name or if the query
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Strings in JPQL and Criteria Queries

Pattern Matching with Wildcards The [NOT] LIKE operator checks if a specified string matches ... '%' is always TRUE (for any c.name value). c.name NOT LIKE '%' is always FALSE (for any c.name value ... character is 1. Zero (0) is returned if the substring is not found. The third argument

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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