diff options
Diffstat (limited to 'das-java/branches/das-java-M2/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/ReadCommandImpl.java')
-rw-r--r-- | das-java/branches/das-java-M2/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/ReadCommandImpl.java | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/das-java/branches/das-java-M2/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/ReadCommandImpl.java b/das-java/branches/das-java-M2/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/ReadCommandImpl.java new file mode 100644 index 0000000000..725285048d --- /dev/null +++ b/das-java/branches/das-java-M2/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/ReadCommandImpl.java @@ -0,0 +1,124 @@ +/* + * 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.impl; + +import java.sql.SQLException; +import java.util.List; + +import org.apache.tuscany.das.rdb.config.wrapper.MappingWrapper; +import org.apache.tuscany.das.rdb.graphbuilder.impl.GraphBuilderMetadata; +import org.apache.tuscany.das.rdb.graphbuilder.impl.ResultSetProcessor; +import org.apache.tuscany.sdo.util.SDOUtil; + +import commonj.sdo.ChangeSummary; +import commonj.sdo.DataGraph; +import commonj.sdo.DataObject; + +public class ReadCommandImpl extends CommandImpl { + + private int startRow = 1; + + private int endRow = Integer.MAX_VALUE; + + public ReadCommandImpl(String sqlString, MappingWrapper mapping, List resultDescriptor) { + super(sqlString); + this.configWrapper = mapping; + + if (resultDescriptor != null && !resultDescriptor.isEmpty()) { + this.resultSetShape = new ResultSetShape(resultDescriptor); + } + } + + + public void execute() { + throw new UnsupportedOperationException(); + } + + public DataObject executeQuery() { + + if (statement.getConnection() == null) { + throw new RuntimeException("A DASConnection object must be specified before executing the query."); + } + + boolean success = false; + try { + List results = statement.executeQuery(parameters); + success = true; + return buildGraph(results); + } catch (SQLException e) { + throw new RuntimeException(e); + } finally { + if (success) { + statement.getConnection().cleanUp(); + } else { + statement.getConnection().errorCleanUp(); + } + } + } + + protected DataObject buildGraph(List results) throws SQLException { + + // Before we use the mappingModel, do some checking/updating. If + // inferrable information + // isn't specified, add it in. + + GraphBuilderMetadata gbmd = new GraphBuilderMetadata(results, configWrapper.getConfig(), + resultSetShape); + + // Create the DataGraph + DataGraph g = SDOUtil.createDataGraph(); + + // Create the root object + g.createRootObject(gbmd.getRootType()); + + SDOUtil.registerDataGraphTypes(g, gbmd.getDefinedTypes()); + + ChangeSummary summary = g.getChangeSummary(); + + ResultSetProcessor rsp = new ResultSetProcessor(g.getRootObject(), gbmd); + rsp.processResults(getStartRow(), getEndRow()); + + summary.beginLogging(); + + return g.getRootObject(); + } + + + protected int getStartRow() { + return startRow; + } + + protected int getEndRow() { + return endRow; + } + + protected void setStartRow(int startRow) { + this.startRow = startRow; + } + + protected void setEndRow(int endRow) { + this.endRow = endRow; + } + + + protected void enablePaging() { + statement.enablePaging(); + } + +} |