Source Code Cross Referenced for ManualAutoIncrementModule.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » components » modules » database » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.components.modules.database 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:
018:        package org.apache.cocoon.components.modules.database;
019:
020:        import java.sql.Connection;
021:        import java.sql.PreparedStatement;
022:        import java.sql.ResultSet;
023:        import java.sql.SQLException;
024:        import java.sql.Statement;
025:        import java.util.HashMap;
026:        import java.util.Map;
027:
028:        import org.apache.avalon.framework.configuration.Configuration;
029:        import org.apache.avalon.framework.configuration.ConfigurationException;
030:        import org.apache.avalon.framework.thread.ThreadSafe;
031:
032:        /**
033:         * Abstraction layer to encapsulate different DBMS behaviour for
034:         * autoincrement columns.
035:         *
036:         * Here: manual mode The new value is determined by doing a "select
037:         * max(column)+1 from table" query. With transactions and correct
038:         * isolation levels, this should to the trick almost everywhere.
039:         *
040:         * Note however, that the above query does not prevent a parallel
041:         * transaction to try to insert a row with the same ID since it
042:         * requires only shared locks. C.f. "Phantom Problem"
043:         *
044:         * @author <a href="mailto:haul@apache.org">Christian Haul</a>
045:         * @version CVS $Id: ManualAutoIncrementModule.java 433543 2006-08-22 06:22:54Z crossley $
046:         */
047:        public class ManualAutoIncrementModule extends
048:                AbstractAutoIncrementModule implements  ThreadSafe {
049:
050:            private Map selectStatements = new HashMap();
051:
052:            public Object getPostValue(Configuration tableConf,
053:                    Configuration columnConf, Configuration modenConf,
054:                    Connection conn, Statement stmt, Map objectModel)
055:                    throws SQLException, ConfigurationException {
056:
057:                return null;
058:            }
059:
060:            public boolean includeInQuery() {
061:                return true;
062:            }
063:
064:            public boolean includeAsValue() {
065:                return true;
066:            }
067:
068:            public Object getPreValue(Configuration tableConf,
069:                    Configuration columnConf, Configuration modeConf,
070:                    Connection conn, Map objectModel) throws SQLException,
071:                    ConfigurationException {
072:
073:                /** Set the key value using SELECT MAX(keyname)+1 **/
074:                String tableName = tableConf.getAttribute("name", "");
075:                String selectQuery = this .getSelectQuery(tableName, columnConf);
076:                PreparedStatement select_statement = conn
077:                        .prepareStatement(selectQuery);
078:                ResultSet set = select_statement.executeQuery();
079:                set.next();
080:                int maxid = set.getInt("maxid");
081:                set.close();
082:                select_statement.close();
083:                if (getLogger().isDebugEnabled())
084:                    getLogger().debug("autoincrementValue " + (maxid + 1));
085:                return new Integer(maxid + 1);
086:            }
087:
088:            public String getSubquery(Configuration tableConf,
089:                    Configuration columnConf, Configuration modeConf)
090:                    throws ConfigurationException {
091:
092:                return null;
093:            }
094:
095:            /**
096:             * Set the String representation of the MaxID lookup statement.  This is
097:             * mapped to the Configuration object itself, so if it doesn't exist,
098:             * it will be created.
099:             */
100:            protected final synchronized void setSelectQuery(String tableName,
101:                    Configuration entry) throws ConfigurationException {
102:
103:                StringBuffer queryBuffer = new StringBuffer("SELECT max(");
104:                queryBuffer.append(entry.getAttribute("name"));
105:                queryBuffer.append(") AS maxid FROM ");
106:                queryBuffer.append(tableName);
107:
108:                this .selectStatements.put(entry, queryBuffer.toString());
109:            }
110:
111:            protected final synchronized String getSelectQuery(
112:                    String tableName, Configuration entry)
113:                    throws ConfigurationException {
114:
115:                String result = (String) this .selectStatements.get(entry);
116:                if (result == null) {
117:                    setSelectQuery(tableName, entry);
118:                    result = (String) this.selectStatements.get(entry);
119:                }
120:                return result;
121:            }
122:
123:        }
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