SpringBoot整合JDBC数据库操作第七弹-自定义RowMapper

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
   * 
  
   * 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 com.edurt.bean;
   
  import org.springframework.jdbc.core.RowMapper;
   
  import java.sql.ResultSet;
  import java.sql.SQLException;
   
  /**
   * ArticleRowMapper 
  
   * 描述 : ArticleRowMapper 
  
   * 作者 : qianmoQ 
  
   * 版本 : 1.0 
  
   * 创建时间 : 2018-03-28 下午2:27 
  
   * 联系作者 : qianmoQ
   */
  public class ArticleRowMapper implements RowMapper
   {
   
      @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
   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