<select id="queryAlarmStatisticalAnalysis4System" parameterType="AlarmMailSendLog"
resultType="java.lang.Integer">
select count(*) from mon_alarm_mail_send_log
where is_del = '0'
<if test="airport != null and airport != ''">
and airport = #{airport}
</if>
<if test="system != null and system != ''">
and system = #{system}
</if>
<if test="relateTable != null and relateTable != ''">
and relate_table = #{relateTable}
</if>
<if test="params.startTime != null and params.startTime != ''">
and send_time >= to_date(#{params.startTime},'yyyy-MM-dd HH24:mi:ss')
</if>
<if test="params.endTime != null and params.endTime != ''">
and send_time <= to_date(#{params.endTime},'yyyy-MM-dd HH24:mi:ss')
</if>
</select>
类似于select count(*)的语句的返回值为java.lang.Integer
