com.h3c.util.persistence.cassandra.query

Class AddQuery<T extends TransportObject<? super T,?>,P extends Storable<?>,C>

java.lang.Object

com.h3c.util.persistence.cassandra.query.AddQuery<T,P,C>

Type Parameters:

P - Type of the result of the query from the Dao.

T - Type of the result

C - Type of Data Store Context

All Implemented Interfaces:

WriteQuery<T,C>

public class AddQuery<T extends TransportObject<? super T,?>,P extends Storable<?>,C>
extends Object
implements WriteQuery<T,C>

AddQuery is used by the consumers of DataStore Service to create a row in a table/column family of a database. In general, the Query objects in persistence framework cache a TransportObject object and Dao object. These objects help in execution of the query.

Constructor Summary

Constructors

Constructor and Description
AddQuery(T transportable, Dao<?,T,P,?,?,C> dao) Provides ability for the business logic to perform Write operations on the persistence layer.

Method Summary

Methods

Modifier and Type	Method and Description
T	execute(C context) This is the single execute method provided by the WriteQuery interface.

Methods inherited from class java.lang.Object

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

Constructor Detail

AddQuery

public AddQuery(T transportable,
        Dao<?,T,P,?,?,C> dao)

Provides ability for the business logic to perform Write operations on the persistence layer. The applications use DAO to perform all database operations and the AddQuery provides methods that DAO can use to take the user query to the lower tiers and persist the data in the database.

Parameters:

transportable -

dao -

Method Detail

execute

public T execute(C context)
                                               throws Exception

This is the single execute method provided by the WriteQuery interface. The application/business logic prepares a Add query and as the last step, calls this method to transmit data to the underlying tiers. This data is persisted using DAO and Entity Manager.

Specified by:

execute in interface WriteQuery<T extends TransportObject<? super T,?>,C>

Parameters:

context - Context to execute the query

Returns:

result of AddQuery operation.

Throws:

NullPointerException - In case of context is null.

Exception - Throws Exception in case of any error in query execute.