/**
* 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.camel.component.sql;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;
import org.apache.camel.Exchange;
import org.apache.camel.NoTypeConversionAvailableException;
import org.apache.camel.impl.DefaultProducer;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.ColumnMapRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.PreparedStatementCallback;
import org.springframework.jdbc.core.RowMapperResultSetExtractor;
public class SqlProducer extends DefaultProducer {
public static final String UPDATE_COUNT = "org.apache.camel.sql.update-count";
private String query;
private JdbcTemplate jdbcTemplate;
public SqlProducer(SqlEndpoint endpoint, String query, JdbcTemplate jdbcTemplate) {
super(endpoint);
this.jdbcTemplate = jdbcTemplate;
this.query = query;
}
public void process(final Exchange exchange) throws Exception {
jdbcTemplate.execute(query, new PreparedStatementCallback() {
public Object doInPreparedStatement(PreparedStatement ps) throws SQLException,
DataAccessException {
int argNumber = 1;
try {
Iterator<?> iterator = exchange.getIn().getBody(Iterator.class);
while (iterator != null && iterator.hasNext()) {
ps.setObject(argNumber++, iterator.next());
}
} catch (NoTypeConversionAvailableException e) {
// ignored - assumed no parameters have to be used
}
// number of parameters must match
int expected = ps.getParameterMetaData().getParameterCount();
if (argNumber - 1 != expected) {
throw new SQLException("Number of parameters mismatch. Expected: " + expected + ", was:" + (argNumber - 1));
}
boolean isResultSet = ps.execute();
if (isResultSet) {
RowMapperResultSetExtractor mapper = new RowMapperResultSetExtractor(new ColumnMapRowMapper());
List<?> result = (List<?>) mapper.extractData(ps.getResultSet());
exchange.getOut().setBody(result);
// preserve headers
exchange.getOut().setHeaders(exchange.getIn().getHeaders());
} else {
exchange.getIn().setHeader(UPDATE_COUNT, ps.getUpdateCount());
}
// data is set on exchange so return null
return null;
}
});
}
}