mybatis sql in 查询

mybatis官方学习文档:http://www.mybatis.org/core/getting-started.html

本文转自:http://www.blogjava.net/xmatthew/archive/2011/08/31/355879.html

1. 当查询的参数只有一个时 
  findByIds(List<Long> ids)
 1.1 如果参数的类型是List, 则在使用时,collection属性要必须指定为 list

<select id="findByIdsMap" resultMap="BaseResultMap">
 Select
 <include refid="Base_Column_List" />
 from jria where ID in
 <foreach item="item" index="index" collection="list" open="(" separator="," close=")">
  #{item}
 </foreach>
</select>

 findByIds(Long[] ids)
 1.2 如果参数的类型是Array,则在使用时,collection属性要必须指定为 array

 <select id="findByIdsMap" resultMap="BaseResultMap">
 select
 <include refid="Base_Column_List" />
 from tabs where ID in
 <foreach item="item" index="index" collection="array" open="(" separator="," close=")">
  #{item}
 </foreach>
 </select>

2. 当查询的参数有多个时,例如 findByIds(String name, Long[] ids)
 这种情况需要特别注意,在传参数时,一定要改用Map方式, 这样在collection属性可以指定名称
         下面是一个示例
         Map<String, Object> params = new HashMap<String, Object>(2);
         params.put("name", name);
         params.put("ids", ids);
        mapper.findByIdsMap(params);

<select id="findByIdsMap" resultMap="BaseResultMap">
 select
 <include refid="Base_Column_List" />
 from tabs where ID in
 <foreach item="item" index="index" collection="ids" open="(" separator="," close=")">
  #{item}
 </foreach>
</select>
原文地址:https://www.cnblogs.com/zhujiabin/p/5026481.html