mybatis if-else写法

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mybaits 中没有else要用chose when otherwise 代替，其语法格式如下：

<choose>
    <when test="">
        //...
    </when>
    <otherwise>
        //...
    </otherwise>
</choose>

实例：

   <insert id="saveAlarmLogByBatch" parameterType="java.util.List">
        insert into alarm_log(`name`, scan_type, src_name, src_ip, src_mac, dst_name, dst_ip, dst_mac, port_range,
        `time`, alarm_id) values
        <foreach collection="alarmLogList" item="alarmLog" index="index" separator="," open="(" close=")">
            <choose>
                <when test="alarmLog.name != null">
                    #{alarmLog.name},
                </when>
                <otherwise>
                    '',
                </otherwise>
            </choose>
            <choose>
                <when test="alarmLog.scanType != null">
                    #{alarmLog.scanType},
                </when>
                <otherwise>
                    '',
                </otherwise>
            </choose>
            <choose>
                <when test="alarmLog.srcName != null">
                    #{alarmLog.srcName},
                </when>
                <otherwise>
                    '',
                </otherwise>
            </choose>
            <choose>
                <when test="alarmLog.srcIp != null">
                    #{alarmLog.srcIp},
                </when>
                <otherwise>
                    '',
                </otherwise>
            </choose>
            <choose>
                <when test="alarmLog.srcMac != null">
                    #{alarmLog.srcMac},
                </when>
                <otherwise>
                    '',
                </otherwise>
            </choose>
            <choose>
                <when test="alarmLog.dstName != null">
                    #{alarmLog.dstName},
                </when>
                <otherwise>
                    '',
                </otherwise>
            </choose>
            <choose>
                <when test="alarmLog.dstIp != null">
                    #{alarmLog.dstIp},
                </when>
                <otherwise>
                    '',
                </otherwise>
            </choose>
            <choose>
                <when test="alarmLog.dstMac != null">
                    #{alarmLog.dstMac},
                </when>
                <otherwise>
                    '',
                </otherwise>
            </choose>
            <choose>
                <when test="alarmLog.portRange != null">
                    #{alarmLog.portRange},
                </when>
                <otherwise>
                    '',
                </otherwise>
            </choose>
            <choose>
                <when test="alarmLog.time != null">
                    #{alarmLog.time},
                </when>
                <otherwise>
                    0,
                </otherwise>
            </choose>
            <choose>
                <when test="alarmLog.alarmId != null">
                    #{alarmLog.alarmId}
                </when>
                <otherwise>
                    0
                </otherwise>
            </choose>
        </foreach>
    </insert>