[英]Select points within polygon mysql - No errors, no results-(What is wrong?)
[英]mysql query points within polygon - no results
我很確定我在這里犯了很多錯誤,但我不確定是什么......
表格(減去幾個字段):
CREATE TABLE IF NOT EXISTS `stuff` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`lat` decimal(12,7) NOT NULL,
`lon` decimal(12,7) NOT NULL,
`location` point NOT NULL,
UNIQUE KEY `id` (`id`),
KEY `distance` (`distance`),
KEY `lat` (`lat`),
KEY `lon` (`lon`),
SPATIAL KEY `location` (`location`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=5;
自動設置位置點的觸發器:
DROP TRIGGER IF EXISTS `stuff_insert_defaults`;
DELIMITER //
CREATE TRIGGER `stuff_insert_defaults` BEFORE INSERT ON `stuff`
FOR EACH ROW SET NEW.location = PointFromText(CONCAT('POINT(',NEW.lat,' ',NEW.lon,')'))
//
DELIMITER ;
DROP TRIGGER IF EXISTS `stuff_update_location`;
DELIMITER //
CREATE TRIGGER `stuff_update_location` BEFORE UPDATE ON `stuff`
FOR EACH ROW SET NEW.location = PointFromText(CONCAT('POINT(',NEW.lat,' ',NEW.lon,')'))
//
DELIMITER ;
一些樣本數據(科羅拉多州內4個隨機點):
/* 4 random points within the state of colorado */
INSERT INTO `stuff` (`id`, `distance`, `lat`, `lon`, `location`) VALUES
(1, 5.0000000, 40.2488450, -103.8003460, 0x000000000101000000f6622827da1f444001df6dde38f359c0),
(2, 5.0000000, 38.4849180, -107.8726700, 0x000000000101000000f19e03cb113e4340d28c45d3d9f75ac0),
(3, 5.0000000, 39.5040250, -105.3584800, 0x000000000101000000e6ae25e483c0434049111956f1565ac0),
(4, 5.0000000, 39.1904180, -106.8179680, 0x000000000101000000ed48f59d5f9843402b4b749659b45ac0);
科羅拉多州粗糙的外圍邊界:
NW corner: 41.000497 -109.050149
NE corner: 41.002380 -102.051881
SE corner: 36.993237 -102.041959
SW corner: 36.999037 -109.045220
應該返回我們插入的4條記錄的查詢:
SELECT *, AsText(location) FROM stuff
WHERE Contains(
GeomFromText('POLYGON((41.000497 -109.050149, 41.002380 -102.051881, 36.993237 -102.041959, 36.999037 -109.045220, 41.000497 -109.050149))'), location );
我要回來的......
nada...
zip...
nil...
nothing...
如類Polygon
(強調添加):
Polygon
斷言
Polygon
的邊界由一組LinearRing
對象(即簡單和封閉的LineString
對象)組成,構成其外部和內部邊界。
因此,您必須通過在起點處完成來關閉多邊形:
SELECT *, AsText(location) FROM stuff
WHERE Contains(
GeomFromText('POLYGON((41.000497 -109.050149, 41.002380 -102.051881, 36.993237 -102.041959, 36.999037 -109.045220, 41.000497 -109.050149))'), location );
在sqlfiddle上看到它。
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