java开发之SQL语句中DATE_FORMAT函数举例详解

DATE_FORMAT(date, format)

SELECT DATE_FORMAT(NOW(), '%Y-%m-%d');

常见的格式化选项有：

%Y 年份，四位数
%y 年份，两位数
%m 月份，两位数
%d 日期，两位数
%H 小时，24小时制，两位数
%h 小时，12小时制，两位数
%i 分钟，两位数
%s 秒，两位数
%p AM/PM

@Data
public class AITimeDatePlay {

	@DateTimeFormat(
			pattern = "yyyy-MM-dd HH:mm:ss"
	)
	@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
	private Date testTime;
}

List<EmployeeInfo> queryInfomationByTime(AITimeDatePlay dto);

<select id="queryInfomationByTime" resultType="com.bonade.hrm.foundation.model.EmployeeInfo">
        select *
        from employee_info ei
        where date_format(ei.initiation_time,'%Y-%m-%d') = DATE_FORMAT(#{testTime},'%Y-%m-%d')
    </select>

select date_format(ei.initiation_time,'%Y-%m-%d') as bigTime
        from employee_info ei
        where date_format(ei.initiation_time,'%Y-%m-%d') = DATE_FORMAT(#{testTime},'%Y-%m-%d')

select date_format(ei.initiation_time,'%Y-%m') as bigTime
        from employee_info ei
        where date_format(ei.initiation_time,'%Y-%m') = DATE_FORMAT(#{testTime},'%Y-%m')

select date_format(ei.initiation_time,'%Y-%m') as bigTime
        from employee_info ei
        where (
            ((DATE_FORMAT( ei.initiation_time, '%Y-%m' )) BETWEEN  #{startTime} AND #{endTime})
            OR (( DATE_FORMAT( ei.leave_time, '%Y-%m' )) BETWEEN  #{startTime} AND #{endTime})
            )

select date_format(ei.initiation_time,'%Y-%m') as bigTime
        from employee_info ei
        where (
            ((DATE_FORMAT( ei.initiation_time, '%Y-%m' )) BETWEEN  DATE_FORMAT(#{startTime},'%Y-%m') AND DATE_FORMAT(#{endTime},'%Y-%m'))
            OR (( DATE_FORMAT( ei.leave_time, '%Y-%m' )) BETWEEN  DATE_FORMAT(#{startTime},'%Y-%m') AND DATE_FORMAT(#{endTime},'%Y-%m'))
            )

SimpleDateFormat date = new SimpleDateFormat("yyyy年MM月dd日");
        Date date1 = new Date();

        Date date2 = date.parse("2020年1月1日");
        System.out.println((date1.getTime()-date2.getTime())/1000/3600/24+"天");