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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I have Entity named Fruits with a column Type which is a enum. I want to fetch the based on Type Eg. Query qry= em.createQuery("Select f from Fruits f where f.Type =: t "); qry.setParameter("t",Type.Sweet); But it return a null result list. Manoj Manoj Kumar Maharana It should work. Please provide
I have a class A, that contains a LinkedHashSet of another class named B. When I try to fetch that hash set, it returns a null pointer. BUT, when I run the program in debug mode, it works fine!! So I'm almost sure it is a bug? Or maybe something I'm doing wrong? Here is a test class that shows
Can you please tell me how to fetch all schema available in my database? Deepak_1996 Deepak Kumar Maharana You can use the JPA metamodel API. support Support
All of my client threads are got hang after doing some fetch operations due to objectdb. Stack trace: java.net.SocketInputStream.socketRead0(Native Method) java.net.SocketInputStream.socketRead(SocketInputStream.java:116) java.net.SocketInputStream.read(SocketInputStream.java:171) java.net
Getting this error when fetching records from mem db.
fetch and JPA query FETCH JOIN. Configurable JDO fetch groups. Ease of Use and Learning ObjectDB ... ). FROM (including INNER JOIN, LEFT OUTER JOIN and JOIN FETCH). WHERE (with both JPQL and JDOQL
" /> <fetch hollow="true" /> <persist serialization="false" /> <cascade-persist always="auto ... all its EntityManager instances. The level 2 cache is disabled by specifying 0 or 0mb. The <fetch> element <fetch hollow="true" /> The hollow attribute of the <fetch> element (whose value is "true" or
javax.persistence.criteria Interface FetchParent<Z,X> Subinterfaces: CollectionJoin, Fetch, From ... which may function as the parent of Fetches. Since: JPA 2.0 Fetch<X,Y> fetch(String attributeName) Create a fetch join to the specified attribute using an inner join. Create a fetch join to the specified
Since: JPA 2.0 Fetch<X,Y> fetch(String attributeName) Create a fetch join to the specified attribute using an inner join. Create a fetch join to the specified attribute using an inner join. Parameters: attributeName - name of the attribute for the target of the join Returns: the resulting fetch join Throws
when a persistent object is being loaded from the database, just after the default fetch group ... the default fetch group, should not be accessed by this method. void jdoPreStore() Called ... this loaded object that are not in the default fetch group should not be accessed by this method. void