Class SelectAction

java.lang.Object

org.apache.cayenne.access.jdbc.BaseSQLAction

org.apache.cayenne.access.jdbc.SelectAction

All Implemented Interfaces:

SQLAction

Direct Known Subclasses:

DB2SelectAction, DerbySelectAction, FirebirdSelectAction, H2SelectAction, IngresSelectAction, SQLiteSelectAction, SQLServerSelectAction

public class SelectAction
extends BaseSQLAction

A SQLAction that handles SelectQuery execution.

Since:

1.2

Field Summary

Fields

Modifier and Type	Field	Description
protected Select<?>	query
protected QueryMetadata	queryMetadata

Fields inherited from class BaseSQLAction

dataNode

Constructor Summary

Constructors

Constructor	Description
SelectAction(Select<?> query, DataNode dataNode)

Method Summary

Modifier and Type	Method	Description
void	performAction(Connection connection, OperationObserver observer)	Executes a query using a strategy defined by the implementation.
protected void	performAction(Connection connection, OperationObserver observer, TranslatedSelect translated)
protected RSColumn[]	resultColumns(TranslatedSelect translated, ResultSet rs)
protected int	statementFetchSize(OperationHints hints)	Returns the fetch size to set on the PreparedStatement, or 0 to leave the driver default alone.

Methods inherited from class BaseSQLAction

getInMemoryOffset, readResultSet

Methods inherited from class Object

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

Field Details

query

protected Select<?> query

queryMetadata

protected QueryMetadata queryMetadata

Constructor Details

SelectAction

public SelectAction(Select<?> query,
 DataNode dataNode)

Since:

4.0

Method Details

performAction

public void performAction(Connection connection,
 OperationObserver observer)
                   throws Exception

Description copied from interface: SQLAction

Executes a query using a strategy defined by the implementation.

Throws:

Exception

performAction

protected void performAction(Connection connection,
 OperationObserver observer,
 TranslatedSelect translated)
                      throws Exception

Throws:

Exception

resultColumns

protected RSColumn[] resultColumns(TranslatedSelect translated,
 ResultSet rs)
                            throws SQLException

Throws:

SQLException

statementFetchSize

protected int statementFetchSize(OperationHints hints)

Returns the fetch size to set on the PreparedStatement, or 0 to leave the driver default alone. The base implementation returns the fetch size of the query, whatever it is. Adapter-specific subclasses may substitute a default of their own when the query does not set one, but must always honor a non-zero query value.

Parameters:

hints - whether the result is handed to the caller as a ResultIterator that outlives this action, and if so, whether that iterator has the connection to itself until it is closed.

Since:

5.0