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Manual
91

Running JPA Queries

The Query interface defines two methods for running SELECT queries: Query.getSingleResult - for use ... . Similarly, the TypedQuery interface defines the following methods: TypedQuery.getSingleResult ... (with getSingleResult) The getResultList method (which was discussed above) can also be used to run queries
JPA Doc
88

getSingleResult()

Method javax.persistence.Query Object getSingleResult() Execute a SELECT query that returns a single untyped result. Returns: the result Throws: NoResultException - if there is no result NonUniqueResultException - if more than one result IllegalStateException - if called for a Java Persistence
JPA Doc
88

getSingleResult()

Method javax.persistence.TypedQuery X getSingleResult() Execute a SELECT query that returns a single result. Returns: the result Throws: NoResultException - if there is no result NonUniqueResultException - if more than one result IllegalStateException - if called for a Java Persistence query
Manual
29

Online Backup

.createQuery("objectdb backup").getSingleResult(); The backup query string is always exactly "objectdb backup ... ");     backupQuery.setParameter("target", new java.io.File("c:\\backup"));     backupQuery.getSingleResult ... .setParameter("target", "backup"); backupQuery.getSingleResult(); When a string is specified as
Manual
29

Query Parameters in JPA

("name", name).getSingleResult(); } The WHERE clause reduces the query results to Country objects ... on which it was invoked), so invocation of getSingleResult can be chained to the same expression ... .setParameter(1, name).getSingleResult(); } The form of ordinal parameters is a question mark
Manual
29

CRUD Database Operations with JPA

p"); System.out.println("Total Points: " + q1.getSingleResult()); The query string ("SELECT ... . The getSingleResult method executes the query and returns the result. It should only be used ... "); System.out.println("Average X: " + q2.getSingleResult()); The new query returns a Double
Forum
28

_PersistenceException: Type is not found on getSingleResult.

_PersistenceException: Type is not found on getSingleResult.
Tutorial
21

Step 3: Add a Main Class

) FROM Point p"); System.out.println("Total Points: " + q1.getSingleResult ... "); System.out.println("Average X: " + q2.getSingleResult()); // Retrieve all the Point
Tutorial
21

Step 3: Add a Main Class

Points: " + q1.getSingleResult()); // Find the average X value: Query q2 = em ... .getSingleResult()); // Retrieve all the Point objects from the database: TypedQuery
Manual
14

Setting and Tuning of JPA Queries

The Query and TypedQuery interfaces define various setting and tuning methods that may affect query execution if invoked before a query is run using getResultList or getSingleResult. Result Range (setFirstResult, setMaxResults) The setFirstResult and setMaxResults methods enable defining a result