About query

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Forum
10

Queries are slow on a large database

and there are performances issues. I am doing small queries and they take much longer than I expect, i.e.: Get the total number of entries Get 25 consecutive entries (i.e. 0-25) Get one specific entry On average each query ... use such query: Query query = pm.newQuery(MessageImpl.class,     "this.logTestRunId
Forum
9

query on calendar class

Hello!   I'm looking for help to build query on calendar class. I need to get objects ... ;     private String A;     @Temporal(TemporalType.TIMESTAMP) private Calendar start; I tested: Query query=em.createQuery("SELECT c FROM Cdr c where c.start.DAY_OF_WEEK = ?1",Cdr.class); query.setParameter
Forum
9

slow performance for a complex query

Hi, We have a query that is constructed dynamically, an example is like this: SELECT DISTINCT $1 ... ')))) I've also tried running the CDI query first and passing the results into the organisation query as ... uploaded for issue http://www.objectdb.com/database/forum/350 This query in both variations takes over 3
Forum
9

Error using query with MAX() function

I have a class that is persisting a Entity that holds remarks and a time. Then when I query ... processing large objects in queries. Please try build 2.2.2_02 that should fix this issue. Thank ... to debug. [2011-05-02 21:10:36 #150 query.manager] query="SELECT MAX($1.addDate) FROM
Forum
9

how to query by properties of onetomany relations? (Error 990)

. However, this query is invalid. You cannot navigate through collections in JPQL directly. You have to use JOIN to define a variable that will iterate over the collection elements. This specific query ... sql joins :) in my last projects i have been using mongodb and such a query was possible for embedded
Manual
9

Locking in JPA

); In addition, the hint can be set for a specific retrieval operation or query. Releasing ... ); A lock mode can also be set for a query in order to lock all the query result objects. When a retrieval
Manual
9

JPA Primary Key

useful when using queries that return large result sets. As an example, consider a real time ... that queries that retrieve all the events of a specified sensor in a specified period are common and return thousands of Event objects. In that case the following primary key can significantly improve query run
Manual
9

JPA Persistable Types

are represented in queries by entity names. By default, the entity name is the unqualified name ... . their instances cannot be shared by different entity objects and they cannot be queried directly ... and retrieval is faster). It simplifies queries on dates and ranges of dates. When an entity is stored
Forum
9

First query takes 4+ minutes to complete

query that we run on the DB which contains about 320,000 records of a single type of object. SQLite ... to the query that we run). @Entity(name="RecordingMetaData") @SequenceGenerator( name ... the queries (JPQL SELECT statements) shown next.  Query We test with the following query: SELECT r from
Issue
9

InternalException when using MEMBER OF on a large list in a query

Hello, we get when executing a query with MEMBER OF on a large list the following InternalException ... ) (... more see attached Image) Our query looks like this: String recordClassName = CoverageRecordImpl.class.getName(); String propertyClassName = propertyClass.getName(); String query = "SELECT DISTINCT property.uid