/**
* 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.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Collections;
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.JdbcTemplate;
import org.springframework.jdbc.core.PreparedStatementCallback;
import org.springframework.jdbc.core.PreparedStatementCreator;
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());
// CAMEL-7313 - check whether to return generated keys
final Boolean shouldRetrieveGeneratedKeys =
exchange.getIn().getHeader(SqlConstants.SQL_RETRIEVE_GENERATED_KEYS, false, Boolean.class);
PreparedStatementCreator statementCreator = new PreparedStatementCreator() {
@Override
public PreparedStatement createPreparedStatement(Connection con) throws SQLException {
if (!shouldRetrieveGeneratedKeys) {
return con.prepareStatement(preparedQuery);
} else {
Object expectedGeneratedColumns = exchange.getIn().getHeader(SqlConstants.SQL_GENERATED_COLUMNS);
if (expectedGeneratedColumns == null) {
return con.prepareStatement(preparedQuery, Statement.RETURN_GENERATED_KEYS);
} else if (expectedGeneratedColumns instanceof String[]) {
return con.prepareStatement(preparedQuery, (String[]) expectedGeneratedColumns);
} else if (expectedGeneratedColumns instanceof int[]) {
return con.prepareStatement(preparedQuery, (int[]) expectedGeneratedColumns);
} else {
throw new IllegalArgumentException(
"Header specifying expected returning columns isn't an instance of String[] or int[] but "
+ expectedGeneratedColumns.getClass());
}
}
}
};
jdbcTemplate.execute(statementCreator, 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);
}
}
boolean isResultSet = false;
// 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 {
isResultSet = ps.execute();
if (isResultSet) {
// preserve headers first, so we can override the SQL_ROW_COUNT header
exchange.getOut().getHeaders().putAll(exchange.getIn().getHeaders());
ResultSet rs = ps.getResultSet();
SqlOutputType outputType = getEndpoint().getOutputType();
log.trace("Got result list from query: {}, outputType={}", rs, outputType);
if (outputType == SqlOutputType.SelectList) {
List<Map<String, Object>> data = getEndpoint().queryForList(rs);
// for noop=true we still want to enrich with the row count header
if (getEndpoint().isNoop()) {
exchange.getOut().setBody(exchange.getIn().getBody());
} else {
exchange.getOut().setBody(data);
}
exchange.getOut().setHeader(SqlConstants.SQL_ROW_COUNT, data.size());
} else if (outputType == SqlOutputType.SelectOne) {
Object data = getEndpoint().queryForObject(rs);
if (data != null) {
// for noop=true we still want to enrich with the row count header
if (getEndpoint().isNoop()) {
exchange.getOut().setBody(exchange.getIn().getBody());
} else {
exchange.getOut().setBody(data);
}
exchange.getOut().setHeader(SqlConstants.SQL_ROW_COUNT, 1);
}
} else {
throw new IllegalArgumentException("Invalid outputType=" + outputType);
}
} else {
exchange.getIn().setHeader(SqlConstants.SQL_UPDATE_COUNT, ps.getUpdateCount());
}
}
if (shouldRetrieveGeneratedKeys) {
if (isResultSet) {
// we won't return generated keys for SELECT statements
exchange.getOut().setHeader(SqlConstants.SQL_GENERATED_KEYS_DATA, Collections.EMPTY_LIST);
exchange.getOut().setHeader(SqlConstants.SQL_GENERATED_KEYS_ROW_COUNT, 0);
} else {
List<Map<String, Object>> generatedKeys = getEndpoint().queryForList(ps.getGeneratedKeys());
exchange.getOut().setHeader(SqlConstants.SQL_GENERATED_KEYS_DATA, generatedKeys);
exchange.getOut().setHeader(SqlConstants.SQL_GENERATED_KEYS_ROW_COUNT, generatedKeys.size());
}
}
// data is set on exchange so return null
return null;
}
});
}
public void setParametersCount(int parametersCount) {
this.parametersCount = parametersCount;
}
}