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30

Threading Problem (maybe with Criteria)

would a ConcurrentLinkedHashMap). FETCH thread nr (36) count: 982 UIDs in 26 msek FETCH thread nr (41) count: 982 UIDs in 29 msek FETCH thread nr (44) count: 982 UIDs in 14 msek FETCH thread nr (39) count: 982 UIDs in 25 msek FETCH thread nr (42) count: 982 UIDs in 31 msek FETCH thread nr (40) count
23

EntityManagerFactory Fails To Swtich Over To Slave When Master Is Unavailable

);     System.out.println("COUNT = " + i);     em.close();     try {      Thread.sleep(1500);     } catch ... ("SELECT p FROM Point p",     Point.class);   List<Point> results = query.getResultList();   int count = 0;   for (Point p : results) {    System.out.println(p);    if(count++>5) {     break
20

Join performance in Objectdb

SELECT count(e) FROM Meta e, ImageNet i, Page p WHERE e.idImage=i.id AND e.idPage=p.id; So simple ... can predict the time for such counting? TIA gzdillon Lai Yang Now, after 2 hours ... of your query would be: SELECT count(e) FROM Meta e, ImageNet i, Page p WHERE e.image=i AND e.page=p
11

JPA Criteria API Queries

, count, sum, avg, min, max, ...). ORDER BY clause (orderBy, Order, asc, desc). The links
11

JPA Query Structure (JPQL / Criteria)

GROUP BY / HAVING (groupBy, having, count, sum, avg, min, max, ...). Criteria ORDER BY (orderBy, Order, asc, desc).
10

javax.persistence.criteria.CriteriaBuilder

item Since: JPA 2.0 Expression<Long> count( Expression<?> x) Create an aggregate expression applying the count operation. Create an aggregate expression applying the count operation. Parameters: x - expression representing input value to count operation Returns: count expression Since: JPA 2.0
6

countDistinct(x)

Method javax.persistence.criteria.CriteriaBuilder Expression<Long> countDistinct( Expression<?> x ) Create an aggregate expression applying the count distinct operation. Parameters: x - expression representing input value to count distinct operation Returns: count distinct expression Since: JPA 2.0
3

Issue with UPPER ?

COUNT($1) FROM com.lexware.vereinsverwaltung.verein.mitglied.Mitglied $1 LEFT JOIN $1.mitgliedschaft $2 ... LIKE '%81%'))))) # Case (2) SELECT COUNT($1) FROM com.lexware.vereinsverwaltung.verein.mitglied ... %')))))) # Case (3) SELECT COUNT($1) FROM com.lexware.vereinsverwaltung.verein.mitglied
3

Issue with cascade delete & add/remove

();     }     private static void printCounts(EntityManager em) {         int Address_1_Count = ((Long) em.createQuery(             "SELECT COUNT(a) FROM Address a WHERE street = '1'")             .getSingleResult()).intValue();         int Address_2_Count = ((Long) em.createQuery(             "SELECT COUNT
1

[ODB1] Chapter 7 - JDOQL Queries

objects can be obtained using the size() method: int count = result.size(); Iteration

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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