Mybatis Select Count(*)的返回值类型介绍
目录
- Select Count(*)的返回值类型
- 返回Count(*)的整数值
Select Count(*)的返回值类型
<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
返回Count(*)的整数值
1、mybatis中resultType定义为"java.lang.Integer"
<select id="selectNums" resultType="java.lang.Integer"> select count(*) from tableName </select>
2、接口中返回值写成int,即可
int selectNums();
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