zoukankan      html  css  js  c++  java
  • 动态sql

    foreach:

    @Data
    public class Blog {
        private String id;
        private String title;
        private String author;
        private Date createTime;
        private int views;
    }
    <?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper
            PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.nbg.dao.BlogMapper">
    <!--collection:用于参数传递,可以是数组或者list,set等集合-->
    <!--open/close:配置的是用什么元素将循环变量包围起来-->
    <!--separator:循环变量的分隔符-->
    <!--index:当前元素在集合位置的下标,即:集合的索引,vs的下标从0开始-->
    <!--item:循环中的变量-->
      <select id="getBlogByForeach" parameterType="map" resultType="blog"> 
        select * from blog
        <where>
          <foreach collection="vs" open="views in (" close=")" separator="," item="v">
            #{v}
          </foreach>
        </where>
      </select>
    </mapper>
        @Test
        public void getBlogByForeach() {
            BlogMapper mapper = session.getMapper(BlogMapper.class);
            HashMap map = new HashMap();
            ArrayList<Integer> list = new ArrayList<Integer>();
            list.add(1);
            list.add(2);
            list.add(3);
            map.put("vs",list);
            for (Blog blogByForeach : mapper.getBlogByForeach(map)) {
                System.out.println(blogByForeach);
            }
            session.close();
        }
  • 相关阅读:
    python+django+uwsgi 搭建环境
    python系列-3 pyenv的使用
    生产消费者队列(TaskCompletionSource)的应用
    socket
    Redis 参考
    webform调用windows服务
    文件编码格式获取
    webform版部分视图与请求拦截
    asp.net 自定义节配置 (configSections下的section)
    组合配置草稿
  • 原文地址:https://www.cnblogs.com/NBG-SDL/p/14087892.html
Copyright © 2011-2022 走看看