com.easycodebox.common.jpa

注释类型 NamedQuery

@Target(value=TYPE)
 @Retention(value=RUNTIME)
public @interface NamedQuery

Is used to specify a named query in the Java Persistence query language, which is a static query expressed in metadata. Query names are scoped to the persistence unit.

The following is an example of the definition of a named query in the Java Persistence query language:

    @NamedQuery(
            name="findAllCustomersWithName",
            query="SELECT c FROM Customer c WHERE c.name LIKE :custName"
    )
 

The following is an example of the use of a named query:

    @PersistenceContext
    public EntityManager em;
    ...
    customers = em.createNamedQuery("findAllCustomersWithName")
            .setParameter("custName", "Smith")
            .getResultList();
 

从以下版本开始:

Java Persistence 1.0

必需元素概要

所需元素

限定符和类型	必需的元素和说明
String	query The query string in the Java Persistence query language

可选元素概要

可选元素

限定符和类型	可选元素和说明
QueryHint[]	hints Vendor-specific query hints
String	name Refers to the query when using the EntityManager methods that create query objects.

元素详细资料

query

public abstract String query

The query string in the Java Persistence query language

name

public abstract String name

Refers to the query when using the EntityManager methods that create query objects.

默认值:

""

hints

public abstract QueryHint[] hints

Vendor-specific query hints

默认值:

{}