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How to check if an entity exists in a Database without loading it?

WHERE e.pk = :pk or SELECT COUNT(e) FROM MyClass e WHERE e.pk = :pk support Support

LazyInitialization / join fetch

count ( item0_.codigo ) from the col_0_0_ item item0_ Nov `` ` This may be occurring due to not doing

Conflicting modifiers .... (javax.persistence.Id, javax.persistence.ManyToOne)

({ @NamedQuery(name = "numberOfMapItems", query = "SELECT COUNT(x) FROM CompoundKeyMapItem x

collection of embedded objects

of @Embeddable objects? ie. Suppose I want to query: SELECT count(a) FROM A a WHERE a.setOfB.value =:value

ObjectDB size not reducing

record count reduces. Trianglehead Json Error When objects are removed sections of the database

java.sql.Timestamp.getTime() not working

Hi, I need to work with Timestamp diff in two entity fields, but this queries SELECT count(p) FROM Player p WHERE p.loginAt.getTime()-p.registeredAt.getTime()>:value SELECT p.loginAt.getTime() FROM Player p fails with object is not an instance of declaring class or java.lang

Entity has be persistended,but query not fetched?

);         System.out.println("count: " + query.getResultList().size());         em.getTransaction

Sorting problem

this kind of method: public List<Product> list(     int start, int count, String sortColumn, boolean

Blocked by find

Richard Szurgot This new stack trace helped solving the "Negative snapshot user count" error (Issue

Server out of memory exceptions

databases do you use concurrently? Following the thread dump I count about 9 open databases. For 10 open

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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