mybatis forEach使用

1.集合的使用

<select id="getCitysByKeys" resultMap="city" parameterType="ArrayList">
        SELECT id,code,name,province FROM bbs_city
        WHERE
        id in
        <foreach collection="list" separator="," item="id" open="(" close=")">
            #{id}
        </foreach>
 </select>

对应方法：

public List<City> getCitysByKeys(List<Integer> idList);