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51-60 of 200 resultsRefreshJPA Entity Fields transient using either the Java code>transientcode> modifier (which also affects serialization) or the JPA code>@Transientcode> annotation (which only affects ... explicitly specified otherwise (e.g. by using the code>@Transientcode | |
CRUD Database Operations with JPA Given an code>EntityManagercode>, code>emcode>, that represents a JPA connection to the object database, we can use ... > The following code fragment stores 1,000 code>Pointcode> objects in the database: | |
General Settings and Logging The code><general>code> configuration element specifies ObjectDB settings ... contains the following code><general>code> element: < ... when processing large data, such as query results that contain millions of objects. The code | |
Database Schema Evolution have matching fields in the old schema are initialized with default values (code>0code>, code>falsecode> or code>nullcode>). Fields in the old schema that do not have matching ... . If the old type is inconvertible to the new type (for instance a change from code>intcode> to code>Date | |
Deleting JPA Entity Objects the code>removecode> method or implicitly ... which way) and then in an active transaction, it can be deleted using the code>removecode> method: Employee | |
GROUP BY and HAVING clauses clause defines iteration over all the code>Countrycode> objects in the database. The GROUP BY clause groups these code>Countrycode> objects by the first letter of the country name. The next step ... supported in the GROUP BY clause by all the JPA implementations. Grouping the code>Country | |
JPA Primary Key>Automatic Primary Key By default, the primary key is a sequential 64 bit number (code>longcode>) that is set automatically by ObjectDB for every new entity object that is stored in ... /java/jpa/Id">code>@Idcode> annotation marks a field as a primary key field. When a primary key | |
Obtaining a JPA Database Connection In JPA a database connection is represented by the code>EntityManagercode> interface. Therefore, in order to manipulate an ObjectDB database we need an code>EntityManagercode> instance. Operations that modify database content also require | |
Collections in JPQL and Criteria Queries> code>c.languages IS EMPTYcode> is code>TRUEcode> if the collection is empty and code>FALSEcode> otherwise. code>c.languages IS NOT EMPTYcode> is FALSE if the collection is empty and code>TRUEcode> otherwise. SIZE The SIZE | |
Server User List The <code>users>code> configuration element lists the users that are allowed ... the following code><users>code> element: <users> < ... is represented by a single code><user>code> element: The required code |