constantactionactivation.java

derby database source code.good for you.

/*

   Derby - Class org.apache.derby.impl.sql.execute.ConstantActionActivation

   Copyright 2004 The Apache Software Foundation or its licensors, as applicable.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */

package org.apache.derby.impl.sql.execute;

import org.apache.derby.iapi.error.StandardException;

import org.apache.derby.iapi.sql.ResultSet;

import java.util.Vector;

/**
	A pre-compiled activation that supports a single ResultSet with
	a single constant action. All the execution logic is contained
	in the constant action.

 */
public final class ConstantActionActivation extends BaseActivation
{

	public int getExecutionCount() { return 0;}
	public void setExecutionCount(int count) {}

	public Vector getRowCountCheckVector() {return null;}
	public void setRowCountCheckVector(Vector v) {}

	public int getStalePlanCheckInterval() { return Integer.MAX_VALUE; }
	public void setStalePlanCheckInterval(int count) {}

	public ResultSet execute() throws StandardException {

		throwIfClosed("execute");
		startExecution();

		if (resultSet == null)
			resultSet = getResultSetFactory().getDDLResultSet(this);
		return resultSet;
	}
	public void postConstructor(){}
}