| 1 | /* ============================================================= |
| 2 | * SmallSQL : a free Java DBMS library for the Java(tm) platform |
| 3 | * ============================================================= |
| 4 | * |
| 5 | * (C) Copyright 2004-2006, by Volker Berlin. |
| 6 | * |
| 7 | * Project Info: http://www.smallsql.de/ |
| 8 | * |
| 9 | * This library is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU Lesser General Public License as published by |
| 11 | * the Free Software Foundation; either version 2.1 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This library is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 16 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| 17 | * License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with this library; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
| 22 | * USA. |
| 23 | * |
| 24 | * [Java is a trademark or registered trademark of Sun Microsystems, Inc. |
| 25 | * in the United States and other countries.] |
| 26 | * |
| 27 | * --------------- |
| 28 | * CommandUpdate.java |
| 29 | * --------------- |
| 30 | * Author: Volker Berlin |
| 31 | * |
| 32 | */ |
| 33 | package smallsql.database; |
| 34 | |
| 35 | |
| 36 | /** |
| 37 | * @author Volker Berlin |
| 38 | * |
| 39 | */ |
| 40 | class CommandUpdate extends CommandSelect { |
| 41 | |
| 42 | // expression from the SET clause like SET dest1 = src1, dest2 = src2 |
| 43 | private Expressions destinations = new Expressions(); |
| 44 | private Expressions sources = new Expressions(); |
| 45 | |
| 46 | private Expression[] newRowSources; |
| 47 | |
| 48 | CommandUpdate( Logger log ){ |
| 49 | super(log); |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Set a value pair of the update command. For example: |
| 54 | * "UPDATE table1 SET col1 = 234" |
| 55 | * "col1" is the dest |
| 56 | * "234" is the source |
| 57 | * @param dest |
| 58 | * @param source must be a ExpressionName |
| 59 | */ |
| 60 | void addSetting(Expression dest, Expression source){ |
| 61 | //destinations.add(dest); |
| 62 | columnExpressions.add(dest); |
| 63 | sources.add(source); |
| 64 | } |
| 65 | |
| 66 | |
| 67 | /*boolean compile(SSConnection con) throws Exception{ |
| 68 | if(super.compile(con)){ |
| 69 | TableView table = TableViewResult.getTableViewResult(join).getTableView(); |
| 70 | newRowSources = new Expression[table.columns.size()]; |
| 71 | for(int i=0; i<destinations.size(); i++){ |
| 72 | String name = destinations.get(i).getName(); |
| 73 | int colIdx = table.findColumn( name ); |
| 74 | if(colIdx>=0){ |
| 75 | // Column found |
| 76 | newRowSources[colIdx] = sources.get(i); |
| 77 | break; |
| 78 | }else |
| 79 | throw Utils.createSQLException("Invalid column name '" + name + "'."); |
| 80 | } |
| 81 | return true; |
| 82 | } |
| 83 | return false; |
| 84 | }*/ |
| 85 | |
| 86 | |
| 87 | void executeImpl(SSConnection con, SSStatement st) throws Exception { |
| 88 | int count = columnExpressions.size(); |
| 89 | columnExpressions.addAll(sources); |
| 90 | compile(con); |
| 91 | columnExpressions.setSize(count); |
| 92 | //TableViewResult result = TableViewResult.getTableViewResult(join); |
| 93 | newRowSources = sources.toArray(); |
| 94 | updateCount = 0; |
| 95 | join.execute(); |
| 96 | while(next()){ |
| 97 | //result.updateRow(newRowSources); |
| 98 | updateRow( con, newRowSources); |
| 99 | updateCount++; |
| 100 | } |
| 101 | } |
| 102 | } |