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22

in(values)

Method javax.persistence.criteria.Expression Predicate in(   Expression values ) Create a predicate to test whether the expression is a member of the collection. Parameters: values - expression corresponding to collection to be tested against Returns: predicate testing for membership Since: JPA 2.0
Manual
20

Database Explorer

to view data in ObjectDB databases, execute JPQL and JDOQL queries and edit the content of databases. Running the Explorer The ObjectDB Explorer is contained in the explorer.jar executable jar file, which is located in the bin directory of ObjectDB. It depends on the objectdb.jar file. You can run
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16

JPA Entity Fields

and inverse fields) can be used in both entity classes and embeddable classes. However, the last two groups (primary key and version fields) can only be used in entity classes. Primary key fields are discussed in the Primary Key section. Transient Fields Transient entity fields are fields
Result
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Eclipse Public License - v 1.0

OF THIS AGREEMENT. 1. DEFINITIONS "Contribution" means: a) in the case of the initial Contributor, the initial code and documentation distributed under this Agreement, and b) in the case of each subsequent ... which: (i) are separate modules of software distributed in conjunction with the Program
Manual
15

Index Definition

Querying without indexes requires iteration over entity objects in the database one by ... . Index management introduces overhead in terms of maintenance time and storage space, so deciding ... } @Unique represents a unique index that prevents duplicate values in the indexed field
Manual
15

JPA Persistable Types

The term persistable types refers to data types that can be used in storing data in the database ... can be stored in the database directly. Other persistable types can be embedded in entity classes as fields. In ... persistent fields would cause data duplication in the database. Entity Classes An entity class
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14

GROUP BY and HAVING clauses

clause in the query execution order is after the FROM and WHERE clauses, but before the SELECT clause. When a GROUP BY clause exists in a JPQL query, database objects (or tuples of database objects ... over all the Country objects in the database. The GROUP BY clause groups these Country objects by
Manual
14

Storing JPA Entity Objects

New entity objects can be stored in the database either explicitly by invoking the persist method ... an instance of the Employee entity class in the database: Employee employee = new Employee("Samuel ... and changes its state to Managed. The new entity object is stored in the database when the transaction
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13

FROM clause (JPQL / Criteria API)

The FROM clause declares query identification variables that represent iteration over objects in the database. A query identification variable is similar to a variable of a Java enhanced for loop in ... at the WHERE clause level by using a type expression. For example, in the following query, c iterates
Manual
12

Retrieving JPA Entity Objects

entity object is not found in the persistence context a new object is constructed and filled ... . Therefore, it is recommended to avoid unnecessary time consuming operations in no-arg constructors ... object in its persistence context no retrieval is required and the existing managed object is returned