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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* Licensed 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.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.tuscany.das.rdb.config.Config;
import org.apache.tuscany.das.rdb.config.ConnectionProperties;
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;
import commonj.sdo.Type;
public class ReadCommandImpl extends CommandImpl {
private Type schema;
private int startRow = 1;
private int endRow = Integer.MAX_VALUE;
public ReadCommandImpl(String sqlString) {
super(sqlString);
}
public ReadCommandImpl(String sqlString, Config mapping) {
this(sqlString);
if (mapping != null)
setMappingModel(mapping);
}
//TODO - Need to refactor based on use of DataSource and CommandGroup
public ReadCommandImpl(String sqlString, Config mapping, Connection connection) {
this(sqlString);
setConnection(connection);
if (mapping != null)
setMappingModel(mapping);
}
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 {
ResultSet rs = statement.executeQuery(parameters);
success = true;
return buildGraph(rs);
} catch (SQLException e) {
throw new RuntimeException(e);
} finally {
if (success)
statement.getConnection().cleanUp();
else
statement.getConnection().errorCleanUp();
}
}
protected DataObject buildGraph(ResultSet result) throws SQLException {
List results = new ArrayList();
results.add(result);
// Before we use the mappingModel, do some checking/updating. If
// inferrable information
// isn't specified, add it in.
GraphBuilderMetadata gbmd = new GraphBuilderMetadata(results, getSchema(), configWrapper.getConfig(),
resultSetShape);
// Create the DataGraph
DataGraph g = SDOUtil.createDataGraph();
// Create the root object
g.createRootObject(gbmd.getSchema());
ChangeSummary summary = g.getChangeSummary();
ResultSetProcessor rsp = new ResultSetProcessor(g.getRootObject(), gbmd);
rsp.processResults(getStartRow(), getEndRow());
summary.beginLogging();
return g.getRootObject();
}
private Type getSchema() {
return (Type) schema;
}
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;
}
private void setMappingModel(Config config) {
configWrapper = new MappingWrapper(config);
//TODO - need to refactor and take into regression that lost ability to use Datasource
if (getConnection() == null)
if (config.getConnectionProperties() != null)
setConnection(config.getConnectionProperties());
}
public void setConnection(ConnectionProperties c) {
try {
Connection connection = null;
Class.forName(c.getDriverClassName());
if (c.getDriverUserName() == null)
connection = DriverManager.getConnection(c.getDriverURL());
else
connection = DriverManager.getConnection(c.getDriverURL(), c.getDriverUserName(), c
.getDriverPassword());
connection.setAutoCommit(false);
setConnection(connection);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
public void setDataObjectModel(Type schema) {
this.schema = schema;
}
protected void enablePaging() {
statement.enablePaging();
}
}
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