org.datanucleus.store.rdbms.request
Class LocateRequest

java.lang.Object
  org.datanucleus.store.rdbms.request.Request
      org.datanucleus.store.rdbms.request.LocateRequest

public class LocateRequest
extends Request

Request to locate a record in the data store. Performs an SQL statement like

 SELECT 1 FROM CANDIDATE_TABLE WHERE ID = ?
 

and checks if the ResultSet is empty

Field Summary

Fields inherited from class org.datanucleus.store.rdbms.request.Request

key, LOCALISER, table

Constructor Summary

LocateRequest(org.datanucleus.store.mapped.DatastoreClass table)
Constructor, taking the table.

Method Summary

void	execute(org.datanucleus.store.ObjectProvider op) Method performing the retrieval of the record from the datastore.

Methods inherited from class java.lang.Object

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

Constructor Detail

LocateRequest

public LocateRequest(org.datanucleus.store.mapped.DatastoreClass table)

Constructor, taking the table. Uses the structure of the datastore table to build a basic query.

Parameters:

table - The Class Table representing the datastore table to retrieve

Method Detail

execute

public void execute(org.datanucleus.store.ObjectProvider op)

Method performing the retrieval of the record from the datastore. Takes the constructed retrieval query and populates with the specific record information.

Specified by:

execute in class Request

Parameters:

op - ObjectProvider for the record to be retrieved