Package 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, table

Constructor Summary

Constructors

Constructor	Description
LocateRequest(DatastoreClass table, org.datanucleus.metadata.AbstractClassMetaData cmd, org.datanucleus.ClassLoaderResolver clr)	Constructor, taking the table.

Method Summary

Modifier and Type	Method	Description
void	execute(org.datanucleus.state.DNStateManager sm)	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(DatastoreClass table,
                     org.datanucleus.metadata.AbstractClassMetaData cmd,
                     org.datanucleus.ClassLoaderResolver clr)

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

cmd - Metadata for the class we are locating an instance of

clr - ClassLoader resolver

Method Detail

execute

public void execute(org.datanucleus.state.DNStateManager sm)

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:

sm - StateManager for the record to be retrieved