/*
* Copyright 2014 mango.jfaster.org
*
* The Mango Project 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.jfaster.mango.mapper;
import org.jfaster.mango.type.TypeHandler;
import org.jfaster.mango.type.TypeHandlerRegistry;
import org.jfaster.mango.util.jdbc.ResultSetWrapper;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* 单列RowMapper
*
* @author ash
*/
public class SingleColumnRowMapper<T> implements RowMapper<T> {
private Class<T> mappedClass;
public SingleColumnRowMapper(Class<T> mappedClass) {
this.mappedClass = mappedClass;
}
@SuppressWarnings("unchecked")
public T mapRow(ResultSet rs, int rowNum) throws SQLException {
ResultSetWrapper rsw = new ResultSetWrapper(rs);
/**
* 在对oralce进行单列分页查询时会引入行号变量,导致单列变成双列,所以去掉下面的检测
*/
//if (rsw.getColumnCount() != 1) {
// throw new MappingException("incorrect column count, expected 1 but " + rsw.getColumnCount());
//}
int index = 1;
TypeHandler<?> typeHandler = TypeHandlerRegistry.getTypeHandler(mappedClass, rsw.getJdbcType(index));
Object value = typeHandler.getResult(rsw.getResultSet(), index);
return (T) value;
}
@Override
public Class<T> getMappedClass() {
return mappedClass;
}
}