com.h3c.util.dao.query

Class DaoTryAddQuery<I extends Serializable,P extends Storable<I>,T extends Transportable<? super T,I>>

java.lang.Object

com.h3c.util.dao.WriteQuery<Boolean>

com.h3c.util.dao.query.DaoTryAddQuery<I,P,T>

Type Parameters:

I - type of the persistent object and transport object id.

P - type of model persistent object.

T - type of the transport object.

public class DaoTryAddQuery<I extends Serializable,P extends Storable<I>,T extends Transportable<? super T,I>>
extends WriteQuery<Boolean>

Tries to create a new persistence layer instance of the transportable object if it does not already exist.

Returns true if the object was persisted, false if it already existed.

Note: This should not be used for persistent objects with auto-generated keys.

Constructor Summary

Constructors

Constructor and Description
DaoTryAddQuery(T transportable, Dao<I,P,T,?,?> dao) Creates a query.

Method Summary

Methods

Modifier and Type	Method and Description
protected Boolean	execute(DataStoreContext context) Executes the query.

Methods inherited from class com.h3c.util.dao.WriteQuery

execute

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DaoTryAddQuery

public DaoTryAddQuery(T transportable,
              Dao<I,P,T,?,?> dao)

Creates a query.

Parameters:

transportable - transport object to add

dao - the DAO to carry out the operation

Method Detail

execute

protected Boolean execute(DataStoreContext context)

Description copied from class: WriteQuery

Executes the query.

Specified by:

execute in class WriteQuery<Boolean>

Parameters:

context - data store context.

Returns:

the result of the query.