ObjectDB Database Search

) ... 1 more If i understand the exception right Spring Data JPA calls getMetamodel on the entity ... Hello! When i configure Spring Data JPA to use ObjectDB 2.4.0_03 i get an exception ... .getMetamodel(Unknown Source) at org.springframework. data .jpa.repository.support

) at com.sun.proxy.$Proxy13.getMetamodel(Unknown Source) at org.springframework. data .jpa.repository ... ) at org.springframework. data .jpa.repository.config.JpaMetamodelMappingContextFactoryBean.createInstance(JpaMetamodelMappingContextFactoryBean.java:56) at org.springframework. data .jpa.repository

This may be related to the fix for the problem described in this thread: Wrong data stored in date ... are using the 2015g time zone data . While we cannot see a problem with date only fields (more testing ... and in 100K records it will show up in about 1 .5K records with no obvious pattern. Also it appears

of the data tree + 1 I'll explain it here: A movie is an entity (like the book) A movie has a list of roles ... @Entity and @Embeddable) and a roleName (String) There are other data like list of directors, list ... regards, Thomas APPENDIX : I'm using lombok ... @Entity @ Data @NoArgsConstructor

ClassCastExceptions on my "entity" classes when I try to read data from the DB. In a very old (2011?) forum ... . The entity obviously has to get loaded by all bundles in order to manipulate the data . This is the code ... ; TypedQuery typedQuery = entityManager.createQuery("SELECT FROM Person p WHERE p.id = 1 ", Person.class

, for example 2am on the 25/10/2015 Madrid time (when clock goes back 1 hour at 3am), Object DB puts wrong data in the fields annotated with Temporal.DATE. The attached DB shows the problem ... the attached DB) to the DB:   Record 1 :     startDateTime = Sun Oct 25 02:00:25 CEST 2015

Our application has some complex entities. We do batch update(merge detached entity) every 2 minutes. We find the period significant IO costs these days, and disappeared when turn off the batch updating. 1 .ObjectDB is in embedded mode. 2.ObjectDB version is 2.3.7 3.Database file size is nearly

Hi, my company is just about to switch from ObjectDB  1 .04.2487 (SE) to ObjectDB 2. So I ... well, but then on converting 1 of the DB files I got this error: java -jar converter.jar ../old.odb ../new.odb ObjectDB 1 .0 ... . Output of conversion: ObjectDB 1 .0 - 2.0 file conversion

, with object 1 .x, the same query was getting executed within an seconds and now the same is taking around 40 ... logEntryIdList"); List param1 has the following data [5] List param2 , data is attached in the file as it was big query.execute(param1, param2); This takes 1 second to execute using objectdb1.x, but the same takes

). May be you have some ideas?  When we just try JBoss 7. 1 . 1 nothing works at all. Where I can get a real ... . webel Dr Darren Kelly As discussed in a previous forum thread - JBoss 7. 1 . 1 is expected to be supported ... there are also issues with GlassFish 3. 1 .2 (GlassFish 3. 1 . 1 may work better with ObjectDB

attempting to update the entity data . A lock with LockModeType.PESSIMISTIC_READ can be used to query data using repeatable-read semantics without the need to reread the data at the end of the transaction to obtain a lock, and without blocking other transactions reading the data . A lock

the database. Since: Jakarta Persistence (JPA) 1 .0 USE Read entity data from the cache ... , Comparable , Serializable Specifies how the EntityManager interacts with the second-level cache when data ... that data may be read from the second-level cache. BYPASS indicates that data may not be read from

is the main data provider within our solution. In the past we often discovered performance problems ... data access on a large 2 dimansional table. Internally we used a list entities which hold a list ... . Creating and traversing. For the traversing we access the data block by block - in each block step by

column. Since: Jakarta Persistence (JPA) 1 .0 X convertToEntityAttribute ( Y dbData ) Converts the data ... may be the same Java type. See Also: Converter Convert.converter Since: Jakarta Persistence (JPA) 1 .0 ... the entity attribute into the data representation to be stored in the database. Parameters: attribute

Jakarta Persistence (JPA) annotations define how entity attributes (fields and properties) 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

when the object data  model is complex. See JPA benchmark results...   Reduce development time. Improve ... Persistence API (JPA) Java Data Objects (JDO) Using a standard Java API (JPA / JDO) provides many benefits

to find() and lock() . Cache retrieve mode Controls whether data is read from the second-level cache: USE ... store mode Controls how data is stored in the cache: USE , BYPASS , or REFRESH . Scope Usage

: UPDATE and DELETE Queries CriteriaQuery is designed exclusively for data retrieval. Bulk data

An entity class is a user-defined class whose instances can be stored in a database. To store data in an ObjectDB database using Jakarta Persistence (JPA), you define entity classes that represent your application's data object model. This chapter contains the following sections:

how the persistence provider propagates operations and loads related data using these enumerations: Specifies ... whether related data is loaded immediately ( EAGER ) or on-demand ( LAZY ). Collection configuration Configure

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

for an entity, allowing data for a single entity to be split across multiple database tables ... within the hierarchy. An enumeration defining the data type of the discriminator column (STRING, CHAR

constraints, ObjectDB can use temporary files when processing large amounts of data , such as query ... . Therefore, ObjectDB uses temporary files only for data that exceeds a size limit specified by the threshold

. Since: Jakarta Persistence (JPA) 1 .0 void evict ( Class cls , Object primaryKey ) Remove the data ... Since: Jakarta Persistence (JPA) 1 .0 void evict ( Class cls ) Remove the data for entities of the specified ... cls , Object primaryKey ) Whether the cache contains data for the given entity. Parameters: cls

creation , schema validation , data cleanup , and schema cleanup for entities belonging to a certain ... , otherwise, assume the schemas already exist Since: Jakarta Persistence (JPA) 1 .0 void drop ( boolean ... , drop schemas, otherwise, leave them be Since: Jakarta Persistence (JPA) 1 .0 void truncate () Truncate

each 1 -2 days we have the situation that our system changes to a completely underperforming mode ... % and around 200 threads hgzwicker Hans-Georg Zwicker According to the subject of this thread it happens every 1 -2 ... massive queries against the data rather than against the indexes. support Support Maybe setting 

JPQL (Java Persistence Query Language) supports updating and deleting database objects by queries. Currently ObjectDB supports only JPQL SELECT (retrieval) queries. Delete queries are supported for JDOQL (JDO Query Language). support Support spring- data -jpa uses delete queries to implement

: absolute value. Since: Jakarta Persistence (JPA) 1 .0 Expression all ( Subquery subquery ) Create ... . Since: Jakarta Persistence (JPA) 1 .0 Predicate and ( Expression x , Expression y ) Create a conjunction ... : and predicate. Since: Jakarta Persistence (JPA) 1 .0 Predicate and ( Predicate... restrictions

one or more secondary tables indicates that the data for the entity class is stored across multiple ... , and have the same names and types as the referenced primary key columns of the primary table. Example 1 : Single ... (JPA) 1 .0 Annotation Elements String name (Required) The name of the table. Since: Jakarta

SUBSTRING(c.name, 1 , 1 ) FROM Country c GROUP BY SUBSTRING(c.name, 1 , 1 ); The FROM clause iterates ... : SELECT DISTINCT SUBSTRING(c.name, 1 , 1 ) FROM Country c GROUP BY with aggregate functions JPQL supports ... and the number of distinct currencies that those countries use: SELECT SUBSTRING(c.name, 1 , 1 ), COUNT(c), COUNT

of recording is data durability, you can keep the recording directory on a different physical device

root directory, $replication , which is located under the server's data root directory. To start

of the Java Data Objects (JDO) API than competing object databases. By using a standard API such as JPA

is an ordered map data structure that ObjectDB maintains in the file system, not in memory. The B

...]] [ORDER BY ...] The SELECT and FROM clauses are required in every query that retrieves data ; update

, criteria queries, and JPQL for data retrieval and manipulation. Describes the metamodel and graph APIs

an alternative way to delete entities. Unlike SELECT queries, which retrieve data from the database

multiple values (even for a simple data structure such as a collection of strings). In addition

-level cache. Use it to check if specific entities are cached or to evict data to ensure

database file : Creates a new database file and copies all recoverable data from the corrupted file

ObjectDB is an Object Oriented Database Management System (ODBMS). It provides all the standard database management services (storage and retrieval, transactions, lock management, query processing, etc.), but it uses an object oriented model to store and manage data . You can easily store ordinary

The API supports the definition of fetch graphs to optimize data loading strategies at runtime

these changes explicitly in the configuration to avoid data loss. The Schema Update section in Chapter 6

To access relational databases using the Java Persistence API (JPA) you will need an Object Relational Mapping (ORM) tool, such as Hibernate, TopLink, EclipseLink, Open JPA or DataNucleus. The DataNucleus ORM implementation supports also the Java Data Objects (JDO) API. ObjectDB is a full featured

other cases, the expectation of a single result might be incorrect, depending on the data in the database

The JPA Criteria API provides type-safe interfaces for defining query result expressions and ordering, mirroring the SELECT and ORDER BY clauses in JPQL or SQL. These interfaces allow you to specify exactly what data is returned and how it is sorted within the result set. SELECT clause elements

Operations on the database will be performed by an instance of a Data Access Object (DAO) that we will define in this step as a Spring MVC component: Open the [New Java Class] dialog box by right clicking the guest package node (in the [Projects] window under Source Packages) and selecting New

Operations on the database will be performed by an instance of a Data Access Object (DAO) that we will define in this step as a Spring MVC component: Open the [New Java Class] dialog box by right clicking the guest package node (in the [Package Explorer] window) and selecting  New Class

file name (e.g. report.rptdesign ) and click Finish. The next step is creating an ObjectDB data source .

You can use ObjectDB with either the Java Persistence API (JPA) or the Java Data Objects (JDO) API. Both share similar architecture, design and abilities. When to prefer JPA JPA is more commonly used. Therefore, it might be the first choice for most new applications. You can use JPA as