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10

find() cost unreasonable time!

@ 0.000000 The sum : 18 Class of Nodes: @Entity @Inheritance(strategy=InheritanceType.JOINED ... ; @Entity @Inheritance(strategy=InheritanceType.JOINED) @DiscriminatorColumn(discriminatorType ... ;   int iCnt = 0;   while (queue.size()>0){    Nodes cur = queue.pop();    Nodes left = new
1

Server out of memory exceptions

cycles. Each cycle of the outer loop should create 10 writer threads (5 for each database) and 2 ... threads to read from test1 and write to test2 - I've left this commented out in the attachment. If I ... size to 5mb and left it running for 25mins I got another out of memory exception on the server. I
1

SELECT clause (JPQL / Criteria API)

can be added to the SELECT clause by using a bound JOIN variable in the FROM clause. Nested path expressions
1

JPA Query Structure (JPQL / Criteria)

, multiselect, array, tuple, construct). Criteria FROM (from, join, fetch). Criteria WHERE (where). Criteria
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JPA Queries

variables, join and fetch): Other criteria query expressions (for all the query clauses):
1

DELETE Queries in JPA/JPQL

multiple variables and JOIN, and cannot include the GROUP BY, HAVING and ORDER BY clauses
1

What are the main benefits of using ObjectDB?

that ability and require multiple tables, multiple records and join operations in order to support
1

WHERE clause (JPQL / Criteria API)

: SELECT c, l FROM Country c JOIN c.languages l WHERE c.population > :p AND l in :languages The FROM
1

UPDATE SET Queries in JPA/JPQL

name) for iteration. Multiple variables and JOIN are not supported. The SET clause defines one or
0

addSubquery(sub, variableDeclaration, candidateCollectionExpression, parameters)

without the leading ":", and the value as the name of the expression in the outer query. If the trimmed expression ... collection to apply to the subquery parameters - the expressions from the outer query to bind

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