php语句：MySQL指定分区表跨分区根据时间条件快速查询记录的封装函数

项目需求：

传感器大数据量数据表，按照日期自动分区，现根据时间筛选条件进行跨分区查询数据。

表分区查询语句语法

mysql表分区查询记录

SELECT * FROM t PARTITION(p0, p1);

时间筛选格式

$fromTime 2021-01-07 00:32:00
$toTime 2021-01-06 15:32:00

封装函数

/*获取查询分区名称
*$pre，分区前缀；
 * $fromTime，起始时间;
 * $toTime,结束时间,默认当前时间;
 * */
function getPart($pre, $fromTime, $toTime)
{
	//防止结束时间为空;
	if ($toTime == "") {
		$toTime = date("Y-m-d");
	}

	//转为标准时间格式2021-01-06;
	$t1 = date("Y-m-d", strtotime($fromTime));
	$t2 = date("Y-m-d", strtotime($toTime));

	//判断两个日期之差;
	$diff = (strtotime($t2) - strtotime($t1)) / 86400;

	//返回拼接分区名称;
	if ($diff == "0") {
		return $pre . date('Ymd', strtotime($fromTime));
	}

	if ($diff == "1") {
		$p1 = $pre . date('Ymd', strtotime($fromTime));
		$p2 = $pre . date('Ymd', strtotime($toTime));
		return $p1 . "," . $p2;
	}

	if ($diff == "2") {
		$p1 = $pre . date('Ymd', strtotime($fromTime));
		$p2 = $pre . date('Ymd', strtotime("+1 day", strtotime($fromTime)));
		$p3 = $pre . date('Ymd', strtotime($toTime));
		return $p1 . "," . $p2 . "," . $p3;
	}
}
echo(getPart('jk_data', '2021-01-03 11:00:00', '2021-01-05 14:05:04'));
//jk_data20210103,jk_data20210104,jk_data20210105

Done!