/**
* 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 java.util.Map;
import org.apache.camel.Exchange;
import org.apache.camel.impl.DefaultProducer;
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 {
private String query;
private JdbcTemplate jdbcTemplate;
private boolean batch;
private boolean alwaysPopulateStatement;
private SqlPrepareStatementStrategy sqlPrepareStatementStrategy;
private int parametersCount;
public SqlProducer(SqlEndpoint endpoint, String query, JdbcTemplate jdbcTemplate, SqlPrepareStatementStrategy sqlPrepareStatementStrategy,
boolean batch, boolean alwaysPopulateStatement) {
super(endpoint);
this.jdbcTemplate = jdbcTemplate;
this.sqlPrepareStatementStrategy = sqlPrepareStatementStrategy;
this.query = query;
this.batch = batch;
this.alwaysPopulateStatement = alwaysPopulateStatement;
}
@Override
public SqlEndpoint getEndpoint() {
return (SqlEndpoint) super.getEndpoint();
}
public void process(final Exchange exchange) throws Exception {
String queryHeader = exchange.getIn().getHeader(SqlConstants.SQL_QUERY, String.class);
final String sql = queryHeader != null ? queryHeader : query;
final String preparedQuery = sqlPrepareStatementStrategy.prepareQuery(sql, getEndpoint().isAllowNamedParameters());
jdbcTemplate.execute(preparedQuery, new PreparedStatementCallback<Map<?, ?>>() {
public Map<?, ?> doInPreparedStatement(PreparedStatement ps) throws SQLException {
int expected = parametersCount > 0 ? parametersCount : ps.getParameterMetaData().getParameterCount();
// only populate if really needed
if (alwaysPopulateStatement || expected > 0) {
// transfer incoming message body data to prepared statement parameters, if necessary
if (batch) {
Iterator<?> iterator = exchange.getIn().getBody(Iterator.class);
while (iterator != null && iterator.hasNext()) {
Object value = iterator.next();
Iterator<?> i = sqlPrepareStatementStrategy.createPopulateIterator(sql, preparedQuery, expected, exchange, value);
sqlPrepareStatementStrategy.populateStatement(ps, i, expected);
ps.addBatch();
}
} else {
Iterator<?> i = sqlPrepareStatementStrategy.createPopulateIterator(sql, preparedQuery, expected, exchange, exchange.getIn().getBody());
sqlPrepareStatementStrategy.populateStatement(ps, i, expected);
}
}
// execute the prepared statement and populate the outgoing message
if (batch) {
int[] updateCounts = ps.executeBatch();
int total = 0;
for (int count : updateCounts) {
total += count;
}
exchange.getIn().setHeader(SqlConstants.SQL_UPDATE_COUNT, total);
} else {
boolean isResultSet = ps.execute();
if (isResultSet) {
RowMapperResultSetExtractor<Map<String, Object>> mapper = new RowMapperResultSetExtractor<Map<String, Object>>(new ColumnMapRowMapper());
List<Map<String, Object>> result = mapper.extractData(ps.getResultSet());
exchange.getOut().setBody(result);
exchange.getIn().setHeader(SqlConstants.SQL_ROW_COUNT, result.size());
// preserve headers
exchange.getOut().setHeaders(exchange.getIn().getHeaders());
} else {
exchange.getIn().setHeader(SqlConstants.SQL_UPDATE_COUNT, ps.getUpdateCount());
}
}
// data is set on exchange so return null
return null;
}
});
}
public void setParametersCount(int parametersCount) {
this.parametersCount = parametersCount;
}
}