mybatis条件语句中带数组参数的处理

<resultMap type="com.xxx.springmybatis.domain.User" id="UserResult">
  <id column="id" jdbcType="BIGINT" property="id"/>
  <result column="name" jdbcType="VARCHAR" property="name"/>
  <result column="email" jdbcType="VARCHAR" property="email"/>
</resultMap>

<select id="findByIds" resultMap="UserResult" parameterType="list">
     select * from users
     where id in
     <foreach collection="list" item="id" open="(" close=")" separator=",">
      #{id,jdbcType=BIGINT}
     </foreach>
</select>

package com.xxx.springmybatis.dao;
import java.util.List;
import com.xxx.springmybatis.domain.User;
public interface UserMapper {
    User getById(Integer id);
    User getByName(String name);
    void save(User user);    
    List<User> findByIds(List<Integer> ids);
}

public void batchDelete(@Param(value = "activityId") Integer activityId, @Param(value = "userIds") Integer[] userIds);

<insert id="batchDelete">
     delete from T_ACT_USERS where ACTIVITY_ID = #{activityId}
     and USER_ID in
     <foreach collection="userIds" item="item" index="index" open="(" separator="," close=")">
            #{item}
     </foreach>
</insert>