/*
* Copyright 2014 the original author or authors.
*
* 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.springframework.xd.jdbc;
import org.springframework.batch.item.database.JdbcCursorItemReader;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.support.JdbcUtils;
import org.springframework.xd.tuple.Tuple;
import org.springframework.xd.tuple.TupleBuilder;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* Reader which reads a row from a database as a delimited string from a
* predefined list of column names.
*
* @author Luke Taylor
* @author Thomas Risberg
*/
public class NamedColumnJdbcItemReader extends JdbcCursorItemReader<Tuple> {
@Override
public void afterPropertiesSet() throws Exception {
setRowMapper(new RowMapper<Tuple>() {
@Override
public Tuple mapRow(ResultSet rs, int rowNum) throws SQLException {
TupleBuilder builder = TupleBuilder.tuple();
for (int i=1; i <= rs.getMetaData().getColumnCount(); i++) {
String name = JdbcUtils.lookupColumnName(rs.getMetaData(), i);
builder.put(name, JdbcUtils.getResultSetValue(rs, i, String.class));
}
return builder.build();
}
});
super.afterPropertiesSet();
}
}