ObjectDB Database Search

The configuration element specifies back-end (database engine) settings for the server ... specifies the database file and page size settings : The initial attribute specifies the initial size ... the database. The element specifies the recovery file settings : The enabled attribute ( "true" or

The configuration element specifies ObjectDB settings that are relevant to both the server ... constraints, ObjectDB can use temporary files when processing large amounts of data , such as query results that contain millions of objects. The element specifies temporary file settings : The path

an alternative way to update entities. Unlike SELECT queries, which retrieve data , UPDATE queries modify ... queries increase the population of all countries by 10%: UPDATE Country SET population = population * 11 / 10 UPDATE Country c SET c.population = c.population * 11 / 10 UPDATE Country AS c SET c.population

The Query and TypedQuery interfaces define various methods for setting and tuning query execution ... that EntityManager , or at the individual query level, which overrides the EntityManager setting ... . JPA adds support for pessimistic locking . The setLockMode method sets a lock mode to apply

The configuration element specifies client-side and embedded-mode settings . The default ... settings : The agent attribute (with a value of "true" or "false" ) specifies whether to load ... reflection even for enhanced classes (for troubleshooting). The element The element specifies settings

Queries against the database are represented in BIRT as data sets . To create the data set : Open the [New Data Set ] dialog box by right clicking the Data Sets node in the [ Data Explorer] window and selecting New Data Set . Select the data source that was created in the previous step (e.g. ObjectDB

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of the ObjectDB data source. The next step is using this data source to create a data set for the BIRT report. ... Connections to the database are represented in BIRT as data sources. To create an ObjectDB data source: Open the [New Data Source] dialog box by right clicking the Data Sources node in the [ Data

. But exporting large binary data sets is very slow. To avoid memory problems the binary data type is read step ... data sets the way is slow. We have an own entity for storing binary data (pictures, documents). Hint: The export enumerates all entities(=table) for exporting data . An overview of this problem

and Reporting Tools (BIRT). It adds support for ObjectDB as a data source and JPQL as a data set query language ... data source. Data sets and JPQL To create the data set : Open the New Data Set dialog box by right-clicking the Data Sets node in the Data Explorer window and selecting New Data Set . Select

it to view data , execute JPQL and JDOQL queries, and edit database content. Running the Explorer ... after editing the file to set the paths to objectdb.jar and the JVM. Connecting to the database Opening ... The Explorer provides two types of viewer windows for database data . The Table window follows

, @Table ) or set globally at the persistence unit level during bootstrapping . This section describes dynamic options that control runtime behavior and allow you to adjust settings per session, query, or operation. Configuration scope hierarchy For non-static configuration (i.e., settings not expressed

, even across different client computers. Setting the shared cache You can configure the shared (L2) cache at three levels ... value. Persistence Unit Settings You can also enable or disable the shared cache by using a persistence unit property: ... ... You can set the jakarta.persistence.sharedCache.mode property

-persistent) fields and has no data to store in the database. Persistent fields Every non-static non ... , such as Hibernate, or for changing default field settings . For example: @Entity public class ... an exception if you try to store an entity with a null value in that field. Cascade and fetch settings

ObjectDB provides a rich set of features. Many features are implemented as part of ObjectDB's ... are supported. Support for remaining features is in progress - see issue tracking (requires login). Java Data ... sessions). Unique data structures and algorithms (as a result of years of R&D). Outperforms competing

Persistable types are data types that can be used for storing data in the database. ObjectDB ... superclasses, and embeddable classes. Simple Java data types: Primitive types, wrapper classes, `String ... multiple persistent fields causes data duplication in the database. Entity classes An entity class

method is useful when you need a reference to an entity but not its data , for example, to set ... the persistence context, JPA constructs a new object and populates it with data from the database or ... retrieves the object's data from the database, constructs a new managed entity, and returns

ObjectDB supports two sets of comparison operators, as shown in the following table: Set 1: JPQL/SQL Set 2: Java/JDO Less Than Less Than or Equal To = Equal To = == Not Equal To != The main difference between the two sets is the syntax for the equal to ( = vs. == ) and not equal to ( vs

Jakarta Persistence (JPA) Enum Constant in jakarta.persistence.metamodel.PluralAttribute.CollectionType SET Set -valued attribute Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaUpdate CriteriaUpdate set (    Path attribute ,    Expression value ) Update the value of the specified attribute. Parameters: attribute - attribute to be updated value - new value Returns: the modified update query. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaUpdate CriteriaUpdate set (    String attributeName ,    Object value ) Update the value of the specified attribute. Parameters: attributeName - name of the attribute to be updated value - new value

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaUpdate CriteriaUpdate set (    SingularAttribute attribute ,    X value ) Update the value of the specified attribute. Parameters: attribute - attribute to be updated value - new value Returns

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaUpdate CriteriaUpdate set (    SingularAttribute attribute ,    Expression value ) Update the value of the specified attribute. Parameters: attribute - attribute to be updated value - new value Returns

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaUpdate CriteriaUpdate set (    Path attribute ,    X value ) Update the value of the specified attribute. Parameters: attribute - attribute to be updated value - new value Returns: the modified update query. Since: Jakarta Persistence (JPA) 1.0

.DispatcherServlet 2 spring *.html 30 index.jsp The settings above routes web requests with  .html suffix to the Spring dispatcher servlet. Additional spring configuration is set in another XML file ... content: The settings above guides Spring to support annotations (for components, controllers

: spring org.springframework.web.servlet.DispatcherServlet 2 spring *.html 30 index.jsp The settings ... configuration is set in another XML file (whose name is derived from the name of the Spring dispatcher ... with the following new content: The settings above guides Spring to support annotations (for components

and specifies their settings (username, password, permissions, and quota). The default configuration file ... whether the user is a superuser. A superuser can manage server settings using the ObjectDB Explorer ... inherit the settings from this master definition. However, the master user itself cannot be used

is essential to avoid update collisions when concurrent users simultaneously update the same data . In ... , which represents a shared lock. PESSIMISTIC_WRITE , which represents an exclusive lock. Setting a Pessimistic ... , a LockTimeoutException is thrown immediately. The "jakarta.persistence.lock.timeout" hint can be set

The configuration element specifies settings for running an ObjectDB Server . The server ... directory . The data path of an ObjectDB server is similar to the document root directory of a web server. Every database file in the data directory and its subdirectories can be accessed by the server

The Jakarta Persistence Criteria API uses a specific set of interfaces to construct the FROM ... , to manage data navigation and retrieval optimization. The interface hierarchy for the FROM clause ... variables for iterating over data in the database that may be relevant to the query results. Query

in criteria queries The criteria query API provides several ways to set the SELECT clause. Single selection Setting a single-expression SELECT clause is straightforward. For example, the following ... . get ("currency")). distinct (true); The select method takes one argument of type Selection and sets

to the slave databases, keeping them synchronized. Setting a master satabase A master ObjectDB database ... cannot. You must enable recording , but no other preparations or settings are required. Setting slave databases Setting up slave databases is straightforward. You only need to run an ObjectDB database server

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Jakarta Persistence (JPA) provides a comprehensive set of annotations and enums for mapping object ... -specific settings , they remain essential for maintaining compatibility with relational providers. Table ... for an entity, allowing data for a single entity to be split across multiple database tables

) are managed. These annotations control data persistence behavior, including fetching strategies, relationship types, and data storage formats. General field mapping Configure standard state mapping behavior using the following annotations: Sets a field or property of a basic attribute (e.g., primitives

: UPDATE and DELETE Queries CriteriaQuery is designed exclusively for data retrieval. Bulk data ... , set new attribute values, and restrict the scope with a WHERE clause. Use this interface to define

behavior. Declare static, reusable JPQL queries directly on the entity class. Optimize data retrieval by ... fields to persistent state, including primary keys, enumerated types, and temporal data . Define ... . Annotations for defining Native SQL queries and result set mappings.

-level cache. Use it to check if specific entities are cached or to evict data to ensure ... these enums: Specifies whether the application uses JTA or resource-local transactions. This setting ... utilizes Jakarta Validation. Use this to explicitly enable, disable, or set validation to auto

exactly what data is returned and how it is sorted within the result set . SELECT clause elements ... a single query result (result set row) and provides methods for obtaining the elements of 

The Java Data Objects (JDO) is another standard for accessing persistent data in databases, using plain old Java objects (POJO) to represent the object model. Unlike Java Persistence API (JPA), which is designated to be used with relational databases, JDO is designated to be used

of recording is data durability, you can keep the recording directory on a different physical device by setting the path attribute in the configuration . The recording directory contains two types

...]] [ORDER BY ...] The SELECT and FROM clauses are required in every query that retrieves data ; update ... FROM ... [WHERE ...] UPDATE ... SET ... [WHERE ...] With a few exceptions, JPQL is case-insensitive

other cases, the expectation of a single result might be incorrect, depending on the data in the database ... : int count = em. createQuery ("UPDATE Country SET area = 0"). executeUpdate

is a parameter that serves as a placeholder for a value. Before executing the query, you must set ... parameter can appear multiple times in the query string. A query can be executed only after you set values for all its parameters. The order in which you set the parameters does not matter. Ordinal

retrieve sets of types: // Get all the managed classes: // (entity classes, embeddable classes, mapped super classes) Set allManagedTypes = metamodel. getManagedTypes (); // Get all the entity classes: Set allEntityTypes = metamodel. getEntities (); // Get all the embeddable classes: Set

, ObjectDB automatically sets the primary key for every new entity. The key is a sequential 64-bit number ... ; // still set automatically : } The @Id annotation marks a field as a primary key field ... . The Generated Values section discusses automatic value generation in detail. Application- set primary key

) is that in JPA data is represented by classes and objects rather than by tables and records as in JDBC. Using plain old Java objects (POJO) to represent persistent data can significantly simplify ... . These implementations are Object Relational Mapping (ORM) tools. The mapping bridges between the data

) layout. Set the column number to 2 , number of details to 1 , select the data set (e.g. Points by X ) in the third field and click OK . Fill the table with data by dragging the x and y columns from the data set in the [ Data Explorer] window (under the data set node) and dropping them on the second

. In the [Select Chart Type] tab select Tube as the chart type and click Next . In the [Select Data ... these fields for content assistant) and click Next . In the [Format Chart] tab you can set the chart title ... to see the chart with the real data : In the next step we will add a table view of the same data to the report.

We start by installing the BIRT development environment and the ObjectDB data source driver. Installing BIRT Choose one of the following options to install the BIRT development environment: Download ... the ObjectDB Data Source Driver To install the ObjectDB data source driver for BIRT: Open the [Install