| /* |
| |
| Derby - Class org.apache.derby.impl.sql.compile.NOPStatementNode |
| |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to you 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.compile; |
| |
| import org.apache.derby.iapi.error.StandardException; |
| import org.apache.derby.iapi.reference.SQLState; |
| import org.apache.derby.iapi.services.context.ContextManager; |
| |
| /** |
| * A NOPStatement node is for statements that don't do anything. At the |
| * time of this writing, the only statements that use it are |
| * SET DB2J_DEBUG ON and SET DB2J_DEBUG OFF. Both of these are |
| * executed in the parser, so the statements don't do anything at execution |
| */ |
| |
| class NOPStatementNode extends StatementNode |
| { |
| |
| NOPStatementNode(ContextManager cm) { |
| super(cm); |
| } |
| |
| String statementToString() |
| { |
| return "NO-OP"; |
| } |
| |
| /** |
| * Bind this NOP statement. This throws an exception, because NOP |
| * statements by definition stop after parsing. |
| * |
| * |
| * @exception StandardException Always thrown to stop after parsing |
| */ |
| @Override |
| public void bindStatement() throws StandardException |
| { |
| /* |
| ** Prevent this statement from getting to execution by throwing |
| ** an exception during the bind phase. This way, we don't |
| ** have to generate a class. |
| */ |
| |
| throw StandardException.newException(SQLState.LANG_PARSE_ONLY); |
| } |
| |
| int activationKind() |
| { |
| return StatementNode.NEED_NOTHING_ACTIVATION; |
| } |
| } |