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SpringBoot整合JDBC数据库操作-7:自定义RowMapper

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2024-02-07 / 0 评论 / 0 点赞 / 14 阅读 / 2425 字 / 正在检测是否收录...
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上篇文章我们讲到了怎么对数据的查询操作,每次查询数据都会在返回中构建一个匿名类去封装返回结果,这样的话导致我们有大量的冗余代码,这并不是我们想要的结果,这篇文章主要讲解一下对数据结果的封装,也就是自定义RowMapper返回结果体.

在bean目录下创建ArticleRowMapper类文件

/**
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 com.edurt.bean;

import org.springframework.jdbc.core.RowMapper;

import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * ArticleRowMapper <br/>
 * 描述 : ArticleRowMapper <br/>
 * 作者 : qianmoQ <br/>
 * 版本 : 1.0 <br/>
 * 创建时间 : 2018-03-28 下午2:27 <br/>
 * 联系作者 : <a href="mailTo:shichengoooo@163.com">qianmoQ</a>
 */
public class ArticleRowMapper implements RowMapper<Article> {

    @Override
    public Article mapRow(ResultSet resultSet, int i) throws SQLException {
        Article article = new Article();
        article.setId(resultSet.getInt("id"));
        article.setTitle(resultSet.getString("title"));
        article.setDescription(resultSet.getString("description"));
        return article;
    }

}

修改ArticleRepository类文件, 替换rowmapper为自定义的类

/**
 * 查询所有数据
 */
public List<Article> findAll() {
    String sql = "SELECT id, title, description FROM article";
    return jdbcTemplate.query(sql, new ArticleRowMapper());
}

/**
 * 查询单条数据
 */
public Article findById(Integer id) {
    String sql = "SELECT id, title, description FROM article WHERE id = ?";
    return jdbcTemplate.queryForObject(sql, new ArticleRowMapper());
}

使用RestAPI测试工具测试api接口可用性

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