MyBatis xml foreach循环语句

package com.youkeda.comment.dao;
import com.youkeda.comment.dataobject.UserDO;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import java.time.LocalDateTime;
import java.util.List;
//fhadmin.cn
@Mapper
public interface UserDAO {
    int batchAdd(@Param("list") List<UserDO> userDOs);
}

<insert id="batchAdd" parameterType="java.util.List" useGeneratedKeys="true" keyProperty="id">
    INSERT INTO user (user_name, pwd, nick_name,avatar,gmt_created,gmt_modified)
    VALUES
    <foreach collection="list" item="it" index="index" separator =",">
        (#{it.userName}, #{it.pwd}, #{it.nickName}, #{it.avatar},now(),now())
    </foreach >
</insert>

package com.youkeda.comment.dao;
import com.youkeda.comment.dataobject.UserDO;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import java.time.LocalDateTime;
import java.util.List;
//fhadmin.cn
@Mapper
public interface UserDAO {
    List<UserDO> findByIds(@Param("ids") List<Long> ids);
}

<select id="findByIds" resultMap="userResultMap">
    select * from user
    <where>
        id in
        <foreach item="item" index="index" collection="ids"
                    open="(" separator="," close=")">
            #{item}
        </foreach>
    </where>
</select>

select * from user where id in (?,?,?)