org.dromara.hutool.db.handler.row.EntityRowHandler Maven / Gradle / Ivy
/*
* Copyright (c) 2013-2024 Hutool Team and hutool.cn
*
* 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.dromara.hutool.db.handler.row;
import org.dromara.hutool.db.Entity;
import org.dromara.hutool.db.handler.ResultSetUtil;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
/**
* 将{@link ResultSet}结果中的某行处理为{@link Entity}对象
*
* @author looly
*/
public class EntityRowHandler extends AbsRowHandler {
private final boolean caseInsensitive;
private final boolean withMetaInfo;
/**
* 构造
*
* @param meta {@link ResultSetMetaData}
* @param caseInsensitive 是否大小写不敏感
* @param withMetaInfo 是否包含表名、字段名等元信息
* @throws SQLException SQL异常
*/
public EntityRowHandler(final ResultSetMetaData meta, final boolean caseInsensitive, final boolean withMetaInfo) throws SQLException {
super(meta);
this.caseInsensitive = caseInsensitive;
this.withMetaInfo = withMetaInfo;
}
@Override
public Entity handle(final ResultSet rs) throws SQLException {
final Entity entity = new Entity(null, caseInsensitive);
return fillEntity(entity, rs);
}
/**
* 处理单条数据
*
* @param Entity及其子对象
* @param row Entity对象
* @param rs 数据集
* @return 每一行的Entity
* @throws SQLException SQL执行异常
* @since 3.3.1
*/
private T fillEntity(final T row, final ResultSet rs) throws SQLException {
int type;
String columnLabel;
for (int i = 1; i <= columnCount; i++) {
type = meta.getColumnType(i);
columnLabel = meta.getColumnLabel(i);
if("rownum_".equalsIgnoreCase(columnLabel)){
// issue#2618@Github
// 分页时会查出rownum字段，此处忽略掉读取
continue;
}
row.put(columnLabel, ResultSetUtil.getColumnValue(rs, i, type, null));
}
if (withMetaInfo) {
try {
row.setTableName(meta.getTableName(1));
} catch (final SQLException ignore) {
//issue#I2AGLU@Gitee
// Hive等NoSQL中无表的概念，此处报错，跳过。
}
row.setFieldNames(row.keySet());
}
return row;
}
}