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  • 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>
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  • 原文地址:https://www.cnblogs.com/zhujiabin/p/5026481.html
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