在原文的基础上,我新增了sql语句,方便大家理解
mysql距离计算,单位m,以及排序
lon 经度 lat 纬度
一般地图上显示的坐标顺序为,纬度在前(范围-90~90),经度在后(范围-180~180)
首先新建一张表,里面包含经纬度
SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for customer -- ---------------------------- DROP TABLE IF EXISTS `customer`; CREATE TABLE `customer` ( `id` int(11) unsigned NOT NULL auto_increment COMMENT \'自增主键\', `name` varchar(50) NOT NULL COMMENT \'名称\', `lon` double(9,6) NOT NULL COMMENT \'经度\', `lat` double(8,6) NOT NULL COMMENT \'纬度\', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8 COMMENT=\'商户表\'; -- ---------------------------- -- Records of customer -- ---------------------------- INSERT INTO `customer` VALUES (\'1\', \'天津市区\', \'117.315575\', \'39.133462\'); INSERT INTO `customer` VALUES (\'2\', \'北京市区\', \'116.407999\', \'39.894073\'); INSERT INTO `customer` VALUES (\'3\', \'保定\', \'115.557124\', \'38.853490\'); INSERT INTO `customer` VALUES (\'4\', \'石家庄\', \'114.646458\', \'38.072369\'); INSERT INTO `customer` VALUES (\'5\', \'昌平区1\', \'116.367180\', \'40.009561\'); INSERT INTO `customer` VALUES (\'6\', \'海淀区2\', \'116.313425\', \'39.973078\'); INSERT INTO `customer` VALUES (\'7\', \'海淀区1\', \'116.329236\', \'39.987231\');
然后我们开始用mysql自带的函数,计算customer表中,每个地方具体。
传入参数 纬度 40.0497810000 经度 116.3424590000
/*传入的参数为 纬度 纬度 经度 ASC升序由近至远 DESC 降序 由远到近 */ SELECT *, ROUND( 6378.138 * 2 * ASIN( SQRT( POW( SIN( ( 40.0497810000 * PI() / 180 - lat * PI() / 180 ) / 2 ), 2 ) + COS(40.0497810000 * PI() / 180) * COS(lat * PI() / 180) * POW( SIN( ( 116.3424590000 * PI() / 180 - lon * PI() / 180 ) / 2 ), 2 ) ) ) * 1000 ) AS juli FROM customer ORDER BY juli ASC
至此,我们就能清楚的查看到纬度 40.0497810000 经度 116.3424590000 距离customer表中的每个地区的距离(单位 m)