ObjectDB Database Search

Jakarta Persistence (JPA) Method in jakarta.persistence.StoredProcedureQuery boolean execute ... result corresponds to result set. Throws: PersistenceException - if the query execution exceeds ... execution exceeds the query timeout value set and only the statement is rolled back. Since: Jakarta Persistence (JPA) 1.0

. com.objectdb.o.UserException - Attempt to execute a query using a closed EntityManager at com ... and executes the following. 3. First statement: @Stateless ClientC.create(and passes the user) 4 ... to execute a query using a closed EntityManager at org.apache.myfaces.view.facelets.el

, and there is only on Entity in the database. Execution of this query (running with ObjectDB) takes about 10-12 seconds. If i remove ANY 5 left joins, query execution time drops to about 50 milliseconds. Adding a new left join on remaining 8 slows down query execution time drastically. Please help

I have facing a problem when i am executing the query first time, Please find the stack trace ... .objectdb.jdo.JdoQuery. execute (JdoQuery.java:720) I am using the following code to execute the same Query ... ()); Collection collection = (Collection)query. execute (); query. execute () is throwing the exception Any

Hello, we want to execute querys in parallel threads on the same entity type in order to increase ... are fine. A parallel query execution doesn't necessarily improve performance, if the serial execution ... a single query? Not every query can benefit from parallel execution . Regarding the profiling data

The test case of the java file attachment persists many entities and executes a query after every persist. The execution time amounts 2 sec when the test persists 1000 entities. The execution time ... more time (i.e. every query execution requires a more expensive flush). Results of your test

Hi, Is is possible in any way to get string representation of a query right before execution , after setting parameters? Of course it's easy to print out query string when we build it by concatenating many strings, but even then we miss attributes. lwalkowski Lukasz Walkowski

.invoke(Method.java:606) at org.eclipse.e4.core.internal.di.MethodRequestor. execute (MethodRequestor.java

We get an internal objectdb error, when we execute a flush. Why? What's wrong? It performs with version objectdb-2.6.4_04. It does not perform with version objectdb-2.6.6_04.   Caused by: com.objectdb.o.InternalException: Unexpected internal exception at com.objectdb.o.JPE.h(JPE.java:168

it to view data, execute JPQL and JDOQL queries, and edit database content. Running the Explorer The ObjectDB Explorer is packaged in the explorer.jar executable file, which is located in the bin directory ... switches the current viewer to focus on that object. Executing queries The Query window on the left lets

The Query and TypedQuery interfaces define various methods for setting and tuning query execution ... execution is much more complex. Therefore, before a query is executed , any uncommitted database changes ... the FlushModeType enum, which has two values: AUTO - Flushes changes before query execution

Query parameters enable you to define reusable queries. You can execute these queries with different parameter values to retrieve different results. Executing the same query multiple times with different parameter values is more efficient than using a new query string for each execution

entities to the database: Executes before the EntityManager persist operation. This is useful for initializing default values or creation timestamps. Executes after the entity is persisted ... when modifying existing entities and flushing changes to the database: Executes before the database update

objects with two range variables forming nested loops (outer and inner) might prevent query execution ... to optimize the execution of multivariable queries. Whenever possible, full nested iteration over the entire Cartesian product is avoided. For example, the query above can be executed as follows: An outer

Jakarta Persistence provides powerful APIs for executing database queries using JPQL strings or ... with full type safety. General query objects Execute SELECT, UPDATE and DELETE queries in JPA using these core interfaces: The base interface for executing queries in JPA. It is often replaced by

: Query Interface used to control stored procedure query execution . Stored procedure query execution ... and getSingleResult are called on a StoredProcedureQuery object, the provider calls execute ... is called on a StoredProcedureQuery object, the provider will call execute on an unexecuted stored

results as arrays. The following code demonstrates the execution of the query and iteration ... results. The following code demonstrates the execution of the query and iteration over the results: List ... ). The following code demonstrates the execution of the query: List results = em. createQuery (q

.executeUpdate () : Use to run DELETE and UPDATE queries. Ordinary query execution (with getResultList ... to retrieve only the names instead of the entire Country instances. Single-result query execution ... with caution and be prepared to catch and handle these exceptions. DELETE and UPDATE query execution

, which you can then execute : TypedQuery query = em. createQuery (q); List results = query. getResultList ... can be executed more concisely: TypedQuery query = em. createQuery ("SELECT c FROM Country c", Country.class ... a TypedQuery instance, query execution and settings are similar, regardless of how the query

their primary key, and execute queries which range over entity types. An entity may be disassociated from ... must also be flushed before execution of any query whose result set would be affected by unflushed modifications ... . If this EntityManager is associated with a transaction, the function is executed in the context of the transaction

. However, even with an index, executing a query to load a field is relatively slow ... because no proxy class is used and the inverse query is executed eagerly when the entity is first

when the query is executed : CURRENT_DATE : Returns the current date as a java.sql.Date instance. CURRENT_TIME ... once on the client side, these expressions are re-evaluated on the server each time the query is executed

this full iteration, allowing complex queries over millions of objects to execute quickly ... them to accelerate query execution . Indexes are especially efficient for lookup and range queries: SELECT p

is a good practice. As with any operation that modifies the database, DELETE queries must be executed ... DELETE queries are executed using the executeUpdate method: int deletedCount = em. createQuery

the execution time of object oriented applications significantly. For instance, collection and map ... convert these queries to SQL and then transition the SQL to the DBMS for execution through a JDBC

interface for executing operations that return a value via a JDBC connection. A functional interface for executing void operations via a JDBC connection.

to define SELECT, WHERE , GROUP BY , and ORDER BY clauses. To execute the query, pass the instance ... query, a subquery cannot be executed directly; it serves as an expression within the parent query

several server-side caches: Cache of database file pages . Cache of query programs . Cache of query execution ... for a specific retrieval operation: // Before executing a query: query. setHint ("jakarta.persistence.cache

database modification, you must execute UPDATE queries within an active transaction. The changes ... : UPDATE Country SET population = 0, area = 0 Execute UPDATE queries by using the executeUpdate

You can start an online backup by executing a special query on an EntityManager ( em ) instance ... a custom backup root directory by setting the target parameter before you execute the backup query

type Super Interfaces: Query Interface used to control the execution of typed queries ... ) explains how to use TypedQuery . Public Instance Methods int executeUpdate () Execute an update or delete ... query. PersistenceException - if the query execution exceeds the query timeout value set

execution . See Also: TypedQuery StoredProcedureQuery Parameter Since: Jakarta Persistence (JPA) 1.0 ... executeUpdate () Execute an update or delete statement. Returns: the number of entities updated or deleted ... statement or for a criteria query. PersistenceException - if the query execution exceeds the query timeout

query programs eliminate the need to recompile queries, but the queries still must be executed

the terms of any separate license agreement you may have executed with Licensor regarding

is also created in the recording directory. Its name, .odb , specifies the last executed transaction

, defining appropriate indexes can significantly improve query execution time. WHERE filter in multi

, which are used to execute database queries. Every JPA implementation provides classes that implement

specifically for Object-Relational Mapping (ORM) and native SQL execution ; ObjectDB ignores these relational

execution . The constructed variable expression can also be used explicitly in other query clauses

for efficient reuse of one query in multiple executions . Result range settings (first, max) - for paging

The GROUP BY clause groups query results. A JPQL query with a GROUP BY clause returns properties of the resulting groups instead of individual objects and fields. In the query execution order, the GROUP BY clause is processed after the FROM and WHERE clauses but before the SELECT clause

If a query includes an ORDER BY clause, it is the last clause to be executed . The FROM clause first

locking wait times. Query exceptions Exceptions specific to query execution and result retrieval

ObjectDB 2.8.7.b08 Our entities are not enhanced and we execute a query "select max(uid) from ModelElementImpl". In the objectdb.conf the reflection is set to error. ...   We got following exception after execution of the query: Caused by: com.objectdb.o.UserException: Unexpected query token

')).contracts.active=true)))) results in "Query Execution Error===null" in Explorer and Internal Exception

was mistakenly executed on a test machine without ObjectDB lizense. At the beginning of the test

execution . Please post the query (and also try it with build 09). support Support Most simple query

Sometimes the ObjectDB throws an internal exception if a find() was executed . It is a sporadic issue that occurs only with Objectdb 2.7.0_b2 and only if the entites are enhanced. (We don't enabled the new property "objectdb.temp.extended-ref-retrieval" from http://www.objectdb.com/database/forum

You can run the application now by right clicking the  GuestServlet node (in the [Projects] window), selecting  Run File , and then clicking  OK (no need to change the servlet execution URI). Since we are using ObjectDB in embedded mode - the database file is created

You can run the application now by right clicking the GuestServlet node (in the [Projects] window), selecting Run File , and then clicking  OK (no need to change the servlet execution URI). Since we are using ObjectDB in embedded mode - the database file is created under the Tomcat directory