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121-130 of 200 resultsRefreshCRUD Database Operations with JPA persisting objects in the database in more detail. JPA Queries with JPQL We can get the number of Point objects in the database by using a simple query: Query">Query q1 = em. | |
WHERE clause (JPQL / Criteria API). It is essential in any JPQL query that retrieves selective objects from the database. Out of the four optional clauses of JPQL queries, the WHERE clause is definitely the most frequently used. How a WHERE Clause Works The following query retrieves | |
ORDER BY clause (JPQL / Criteria API) The ORDER BY clause specifies a required order for the query results. Any JPQL query ... . ORDER BY Expressions The following query ... the country name: query"> SELECT c.name FROM Country c WHERE c.population > | |
Paths and Types in JPQL and Criteria API> query/jpql/from">Variables - FROM identification variables and SELECT result variables. query/parameter">Parameters ... , string, date). Simple type values are more useful in queries. They have special operators | |
Index Definition Querying without indexes requires iteration over entity objects in the database one by ... proper indexes the iteration can be avoided and complex queries over millions of objects ... Queries ObjectDB manages a BTree for every index. A BTree is an ordered map data | |
Database Explorer. It can be used to view data in ObjectDB databases, execute JPQL and JDOQL queries and edit the content ... and indexes. The [Query] window enables running JPQL and JDOQL queries, as discussed ... is a descendant of itself in the tree). To open a new viewer window either write a query in | |
javax.persistence.TypedQuery/Query" title="Interface in javax.persistence">Query Interface used to control the execution of typed queries ... /Query" title="Interface in javax.persistence">Query | |
Database Management Settings" priority="40" /> <query-cache results="32mb" programs="500" /> <extensions drop="temp ... . For debugging of query failure it might be necessary to record "all" operations in order ... to accelerate the execution of relevant queries. The <query-cache> element | |
[ODB1] Chapter 9 - ObjectDB Explorer the Explorer to browse databases, execute JDOQL queries, create new databases and edit the content ... among them and execute queries is very valuable during development and debugging ... ="/database/jdo/manual/chapter6">chapter 6). The "Query" window enables a user to execute JDOQL | |
javax.jdo.JDOEntityManager"> Query" title="Interface in javax.persistence">Query Create an instance of Query |