io.ebean

Enum PersistenceContextScope

java.lang.Object

java.lang.Enum<PersistenceContextScope>

io.ebean.PersistenceContextScope

All Implemented Interfaces:

Serializable, Comparable<PersistenceContextScope>

public enum PersistenceContextScope
extends Enum<PersistenceContextScope>

Defines the scope for PersistenceContext.

Ebean has traditionally used Transaction scope for the PersistenceContext. This is used to change the scope to use (by default) and explicitly set the scope to use for an individual query.

See Also:

ServerConfig.setPersistenceContextScope(PersistenceContextScope), Query.setPersistenceContextScope(PersistenceContextScope)

Enum Constant Summary

Enum Constants

Enum Constant and Description
QUERY PersistenceContext is scoped to the query.
TRANSACTION PersistenceContext is scoped to the transaction.

Method Summary

Modifier and Type	Method and Description
static PersistenceContextScope	valueOf(String name) Returns the enum constant of this type with the specified name.
static PersistenceContextScope[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

TRANSACTION

public static final PersistenceContextScope TRANSACTION

PersistenceContext is scoped to the transaction.

If a transaction spans 2 or more queries that fetch the same bean in terms of same type and same Id value then they share the same bean instance.

You may want to change to use QUERY scope when you want a query executing in a transaction to effectively ignore beans that have already been loaded (by other queries in the same transaction) and instead get a 'fresh copy' of the bean.

QUERY

public static final PersistenceContextScope QUERY

PersistenceContext is scoped to the query.

This means that for this query running in an existing transaction then it will effectively ignore any beans that have already been queried/loaded by prior queries in the same transaction.

You may use QUERY scope on a query that is executed in a transaction and you want to get a 'fresh copy' of the bean.

Method Detail

values

public static PersistenceContextScope[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (PersistenceContextScope c : PersistenceContextScope.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static PersistenceContextScope valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null