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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that I can express one level of eager fetch in JPQL as follows: SELECT c FROM C JOIN FETCH c.bList WHERE c.id=:id But when I attempt to take it to the 2nd level: SELECT c FROM C JOIN FETCH c.bList JOIN FETCH c.bList.aList WHERE c.id=:id I get an error along the lines of: Invalid fetch path
fetch doi.metadata metadata left join fetch metadata.titles titles left join fetch metadata.creators creators left join fetch metadata.descriptions descriptions left join fetch metadata.publishers publishers left join fetch metadata.contributors contributors left join fetch metadata.dates
Hello, I'm a little bit confused about a left join fetch behaviour. In this test case, i try to fetch my 3 children using a left join fetch. But my collection is null after closing the em. It was expected to be fetched before closing the em, no ? In fact, that is the objective of the fetch purpose
Hello, I'm doing some tests to choose the best collection fetch strategy. I have entities with many ... ,join fetch seems to be the right choice. What about ObjectDb ? The implementation is totally different. Is an "All eager strategy" more efficient that many join fetch ( cartesian product + distinct
First of all, thank you for promptly implementing JOIN FETCH over nested paths in response ... , but I attempt to LEFT JOIN FETCH all the members of a collection within a (non-existent) member ... where bList is empty, the following works (returns my instance of C): SELECT c FROM C c LEFT JOIN FETCH
JOIN FETCH to avoid excessive round trips to the database: SELECT c FROM Country c JOIN FETCH c ... addresses (obviously fetched lazily), but still 2 results. What should I be doing to get what I want out of this query? Note that I need to get the fetch mode specified in the query, not in the entity
I have a class where two fields are annotated with @Basic(fetch = FetchType.LAZY ... app). Yet they don't seem to be fetched lazily. This class should hopefully demonstrate the problem ... ; @Basic(fetch = FetchType.LAZY) private String description; @Basic(fetch = FetchType.LAZY
Fetch Elements Join Fetch is managed in criteria queries by the following interfaces: See the FROM in Criteria Queries section for more details and an example.
FETCH JPA support of transparent navigation and fetch makes it very easy to use, since it provides ... the same result objects (Country instances): SELECT c FROM Country c JOIN FETCH c.capital The JOIN FETCH expression is not a regular JOIN and it does not define a JOIN variable. Its only purpose
="transactional" /> <field name="f3" default-fetch-group="true" /> <field name="f4" default-fetch-group="false" /> <field name="f5" embedded="true" /> <field name="f6 ... to its value at the beginning of the transaction. default-fetch-group (true | false) The default-fetch