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diff --git a/das-java/branches/das-java-beta2/rdb/src/main/java/org/apache/tuscany/das/rdb/generator/impl/UpdateGenerator.java b/das-java/branches/das-java-beta2/rdb/src/main/java/org/apache/tuscany/das/rdb/generator/impl/UpdateGenerator.java
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+++ b/das-java/branches/das-java-beta2/rdb/src/main/java/org/apache/tuscany/das/rdb/generator/impl/UpdateGenerator.java
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+/*
+ * 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.tuscany.das.rdb.generator.impl;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+
+import org.apache.log4j.Logger;
+import org.apache.tuscany.das.rdb.config.Column;
+import org.apache.tuscany.das.rdb.config.Table;
+import org.apache.tuscany.das.rdb.config.wrapper.MappingWrapper;
+import org.apache.tuscany.das.rdb.config.wrapper.RelationshipWrapper;
+import org.apache.tuscany.das.rdb.config.wrapper.TableWrapper;
+import org.apache.tuscany.das.rdb.impl.CollisionParameter;
+import org.apache.tuscany.das.rdb.impl.ManagedParameterImpl;
+import org.apache.tuscany.das.rdb.impl.OptimisticWriteCommandImpl;
+import org.apache.tuscany.das.rdb.impl.ParameterExtendedImpl;
+import org.apache.tuscany.das.rdb.impl.SDODataTypeHelper;
+import org.apache.tuscany.das.rdb.impl.UpdateCommandImpl;
+
+import commonj.sdo.ChangeSummary;
+import commonj.sdo.DataObject;
+import commonj.sdo.Property;
+import commonj.sdo.Type;
+import commonj.sdo.ChangeSummary.Setting;
+
+public final class UpdateGenerator extends BaseGenerator {
+
+    public static final UpdateGenerator INSTANCE = new UpdateGenerator();
+
+    private final Logger logger = Logger.getLogger(UpdateGenerator.class);
+
+    private UpdateGenerator() {
+        super();
+    }
+
+    public UpdateCommandImpl getUpdateCommand(MappingWrapper mapping, DataObject changedObject, Table table) {      
+        List parameters = new ArrayList();
+        Type type = changedObject.getType();
+        TableWrapper tableWrapper = new TableWrapper(table);
+        StringBuffer statement = new StringBuffer("update ");
+        if(mapping.getConfig().isDatabaseSchemaNameSupported()){
+        	statement.append(table.getSchemaName()+"."+table.getTableName());
+        }
+        else{
+        statement.append(table.getTableName());
+        }
+        statement.append(" set ");
+
+        ChangeSummary summary = changedObject.getDataGraph().getChangeSummary();
+        HashSet changedFields = getChangedFields(mapping, summary, changedObject, tableWrapper);
+        Iterator i = changedFields.iterator();
+      
+        int idx = 1;
+        while (i.hasNext()) {
+            Property property = (Property) i.next();
+            Column c = tableWrapper.getColumnByPropertyName(property.getName());          
+            
+            if ((c == null) || !c.isCollision() || !c.isPrimaryKey()) { 
+                String columnName = c == null ? property.getName() : c.getColumnName();
+                appendFieldSet(statement, idx > 1, columnName);
+                parameters.add(createParameter(tableWrapper, property, idx++));
+            } 
+        }
+        
+        Column c = tableWrapper.getManagedColumn();
+        if (c != null) {
+            appendFieldSet(statement, idx > 1, c.getColumnName());
+            String propertyName = c.getPropertyName() == null ? c.getColumnName() : c.getPropertyName();
+            parameters.add(createManagedParameter(tableWrapper, 
+                    changedObject.getInstanceProperty(propertyName), idx++));
+        }
+        
+        statement.append(" where ");
+
+        Iterator pkColumnNames = tableWrapper.getPrimaryKeyNames().iterator();
+        Iterator pkPropertyNames = tableWrapper.getPrimaryKeyProperties().iterator();
+        while (pkColumnNames.hasNext() && pkPropertyNames.hasNext()) {
+            String columnName = (String) pkColumnNames.next();
+            String propertyName = (String) pkPropertyNames.next();
+            statement.append(columnName);
+            statement.append(" = ?");
+            if (pkColumnNames.hasNext() && pkPropertyNames.hasNext()) {
+                statement.append(" and ");
+            }
+            parameters.add(createParameter(tableWrapper, type.getProperty(propertyName), idx++));
+        }
+
+        if (tableWrapper.getCollisionColumn() == null) {
+            Iterator iter = changedFields.iterator();
+            while (iter.hasNext()) {
+                statement.append(" and ");
+                Property changedProperty = (Property) iter.next();
+                Column column = tableWrapper.getColumnByPropertyName(changedProperty.getName()); 
+                statement.append(column == null ? changedProperty.getName() : column.getColumnName());
+                                 
+                Object value;
+                Setting setting = summary.getOldValue(changedObject, changedProperty);
+                // Setting is null if this is a relationship change
+                if (setting == null) {
+                    value = changedObject.get(changedProperty);
+                } else {
+                    value = setting.getValue();
+                }
+                
+                if (value == null) {                   
+                    statement.append(" is null");                    
+                } else {
+                	ParameterExtendedImpl param = createCollisionParameter(tableWrapper, changedProperty, idx++);
+                    statement.append(" = ?");
+                    param.setValue(value);
+                    parameters.add(param);
+                }
+                
+               
+            }
+           
+        } else {
+            statement.append(" and ");
+            statement.append(tableWrapper.getCollisionColumn().getColumnName());
+            statement.append(" = ?");
+            parameters.add(createParameter(tableWrapper, 
+                    type.getProperty(tableWrapper.getCollisionColumnPropertyName()), idx++));                       
+        }                  
+
+        UpdateCommandImpl updateCommand = new OptimisticWriteCommandImpl(statement.toString());
+        
+        Iterator params = parameters.iterator();
+        while (params.hasNext()) {           
+        	updateCommand.addParameter((ParameterExtendedImpl) params.next());
+        }
+           
+        if (this.logger.isDebugEnabled()) {
+            this.logger.debug(statement.toString());
+        }
+
+        return updateCommand;
+    }
+
+  
+
+    private void appendFieldSet(StringBuffer statement, boolean appendComma, String columnName) {
+        if (appendComma) {
+            statement.append(", ");
+        }
+        statement.append(columnName);
+        statement.append(" = ?");
+    }
+
+
+
+    private HashSet getChangedFields(MappingWrapper config, ChangeSummary summary, DataObject obj, TableWrapper tw) {
+        HashSet changes = new HashSet();
+        
+        Iterator i = summary.getOldValues(obj).iterator();
+        while (i.hasNext()) {
+            ChangeSummary.Setting setting = (ChangeSummary.Setting) i.next();
+            
+            if (setting.getProperty().getType().isDataType()) {
+               if ( changes.add(setting.getProperty()) == false ) {
+                   throw new RuntimeException("Foreign key properties should not be set when the corresponding relationship has changed");
+               }
+            } else {
+                Property ref = setting.getProperty();
+                if (!ref.isMany()) {
+                    RelationshipWrapper r = new RelationshipWrapper(config.getRelationshipByReference(ref));
+
+                    Iterator keys = r.getForeignKeys().iterator();
+                    while (keys.hasNext()) {
+                        String key = (String) keys.next();
+                        String keyProperty = config.getColumnPropertyName(tw.getTableName(), key);
+                        Property keyProp = obj.getType().getProperty(keyProperty);
+                        if ( keyProp == null ) 
+                            throw new RuntimeException("Invalid foreign key column: " + key);
+                        if (changes.add(keyProp) == false) {
+                            throw new RuntimeException("Foreign key properties should not be set when the corresponding relationship has changed");
+                        }
+                    }
+                }
+
+            }
+        }
+        return changes;
+    }
+
+    private ParameterExtendedImpl fillExtendedParameter(ParameterExtendedImpl param, TableWrapper table, Property property, int idx) {
+        param.setName(property.getName());
+        param.setType(property.getType());
+        param.setConverter(getConverter(table.getConverter(property.getName())));
+        if (idx != -1) {
+            param.setIndex(idx);
+        }
+        param.setColumnType(SDODataTypeHelper.columnTypeForSDOType(property.getType()));
+        return param;
+    }
+    private ParameterExtendedImpl createCollisionParameter(TableWrapper tableWrapper, Property property, int i) {
+    	ParameterExtendedImpl param = new CollisionParameter();
+    	return fillExtendedParameter(param, tableWrapper, property, i);
+    }
+    
+    private ParameterExtendedImpl createManagedParameter(TableWrapper table, Property property, int idx) {
+    	ParameterExtendedImpl param = new ManagedParameterImpl();
+    	return fillExtendedParameter(param, table, property, idx);
+    }
+
+    private ParameterExtendedImpl createParameter(TableWrapper table, Property property, int idx) {
+    	ParameterExtendedImpl param = new ParameterExtendedImpl();
+    	return fillExtendedParameter(param, table, property, idx);
+    }
+}