| /* |
| |
| Derby - Class org.apache.derby.impl.sql.compile.OptTraceViewer |
| |
| 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 java.sql.Connection; |
| import java.sql.DriverManager; |
| import java.sql.PreparedStatement; |
| import java.sql.SQLException; |
| import org.apache.derby.iapi.reference.SQLState; |
| import org.apache.derby.iapi.services.i18n.MessageService; |
| import org.apache.derby.iapi.sql.dictionary.OptionalTool; |
| |
| /** |
| * <p> |
| * OptionalTool for viewing the output created when you xml-trace the optimizer. |
| * </p> |
| */ |
| public class OptTraceViewer implements OptionalTool |
| { |
| //////////////////////////////////////////////////////////////////////// |
| // |
| // CONSTANTS |
| // |
| //////////////////////////////////////////////////////////////////////// |
| |
| //////////////////////////////////////////////////////////////////////// |
| // |
| // STATE |
| // |
| //////////////////////////////////////////////////////////////////////// |
| |
| //////////////////////////////////////////////////////////////////////// |
| // |
| // CONSTRUCTOR |
| // |
| //////////////////////////////////////////////////////////////////////// |
| |
| /** 0-arg constructor required by the OptionalTool contract */ |
| public OptTraceViewer() {} |
| |
| /////////////////////////////////////////////////////////////////////////////////// |
| // |
| // OptionalTool BEHAVIOR |
| // |
| /////////////////////////////////////////////////////////////////////////////////// |
| |
| /** |
| * <p> |
| * Takes the following arguments: |
| * </p> |
| * |
| * <ul> |
| * <li>fileURL - The url of the file holding the xml trace. E.g.: "file:///Users/me/mainline/z.txt"</li> |
| * </ul> |
| * |
| * <p> |
| * ...and creates the following schema objects for viewing the xml trace of the optimizer: |
| * </p> |
| * |
| * <ul> |
| * <li>ArrayList - A user-defined type wrapping java.util.ArrayList.</li> |
| * <li>asList - A factory function for creating ArrayLists.</li> |
| * <li>planCost - An XmlVTI for viewing xml traces.</li> |
| * <li>planCost - A view which passes the file name to the XmlVTI.</li> |
| * </ul> |
| */ |
| public void loadTool( String... configurationParameters ) |
| throws SQLException |
| { |
| if ( (configurationParameters == null) || (configurationParameters.length != 1) ) |
| { throw wrap( MessageService.getTextMessage( SQLState.LANG_BAD_OPTIONAL_TOOL_ARGS ) ); } |
| |
| String fileURL = configurationParameters[ 0 ]; |
| String createView = XMLOptTrace.PLAN_COST_VIEW.replace( "FILE_URL", fileURL ); |
| |
| Connection conn = getDerbyConnection(); |
| |
| executeDDL |
| ( |
| conn, |
| "create type ArrayList external name 'java.util.ArrayList' language java" |
| ); |
| executeDDL |
| ( |
| conn, |
| "create function asList( cell varchar( 32672 ) ... ) returns ArrayList\n" + |
| "language java parameter style derby no sql\n" + |
| "external name 'org.apache.derby.vti.XmlVTI.asList'\n" |
| ); |
| executeDDL( conn, XMLOptTrace.PLAN_COST_VTI ); |
| executeDDL( conn, createView ); |
| } |
| |
| /** |
| * <p> |
| * Drop the schema objects which were created for viewing the xml file |
| * containing the optimizer trace. |
| * </p> |
| */ |
| public void unloadTool( String... configurationParameters ) |
| throws SQLException |
| { |
| Connection conn = getDerbyConnection(); |
| |
| executeDDL( conn, "drop view planCost" ); |
| executeDDL( conn, "drop function planCost" ); |
| executeDDL( conn, "drop function asList" ); |
| executeDDL( conn, "drop type ArrayList restrict" ); |
| } |
| |
| //////////////////////////////////////////////////////////////////////// |
| // |
| // MINIONS |
| // |
| //////////////////////////////////////////////////////////////////////// |
| |
| private Connection getDerbyConnection() throws SQLException |
| { |
| return DriverManager.getConnection( "jdbc:default:connection" ); |
| } |
| |
| private void executeDDL |
| ( Connection conn, String text ) |
| throws SQLException |
| { |
| PreparedStatement ddl = prepareStatement( conn, text ); |
| ddl.execute(); |
| ddl.close(); |
| } |
| |
| private PreparedStatement prepareStatement |
| ( Connection conn, String text ) |
| throws SQLException |
| { |
| return conn.prepareStatement( text ); |
| } |
| |
| /** Wrap an exception in a SQLException */ |
| private SQLException wrap( Throwable t ) |
| { |
| return new SQLException( t.getMessage(), t ); |
| } |
| |
| private SQLException wrap( String errorMessage ) |
| { |
| String sqlState = org.apache.derby.shared.common.reference.SQLState.JAVA_EXCEPTION.substring( 0, 5 ); |
| |
| return new SQLException( errorMessage, sqlState ); |
| } |
| } |
| |