從MySQL幾何WKT數據中獲取geojson線串

Question

我試圖從這里使用真棒PHP-Database-GeoJSON庫獲取GeoJSON線串格式https://github.com/bmcbride/PHP-Database-GeoJSON但是現在沒有任何運氣

我成功地使用該庫從MySQL表調用簡單點，但是使用線和多邊形，故事有點不同。

首先，我創建了幾何字段表，如下所示：

-- phpMyAdmin SQL Dump
-- version 4.4.6
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Jan 20, 2016 at 10:12 PM
-- Server version: 5.6.24
-- PHP Version: 5.6.8

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;

--
-- Database: `web_gis`
--

-- --------------------------------------------------------

--
-- Table structure for table `wkt_linija`
--

DROP TABLE IF EXISTS `wkt_linija`;
CREATE TABLE IF NOT EXISTS `wkt_linija` (
  `id` int(11) NOT NULL,
  `oznaka` varchar(50) NOT NULL,
  `opis` varchar(200) NOT NULL,
  `sirina` varchar(200) NOT NULL,
  `podloga` varchar(200) NOT NULL,
  `mo` varchar(200) NOT NULL,
  `geometry` geometry NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

--
-- Dumping data for table `wkt_linija`
--

INSERT INTO `wkt_linija` (`id`, `oznaka`, `opis`, `Å¡irina`, `podloga`, `mo`, `geometry`) VALUES
(1, 'K-8', 'D206 - Vulica - Kraljevec - Horvati - Kordej - S1', '5 m', 'Asfalt-makadam', 'Kostel', '\0\0\0\0\0\0\0¿\0\0\0§5l¹r/@##LêG@eëŸëÑr/@,†‰©G@E¤úâèr/@*éöŠG@Ç4sùr/@õYd\rG@}VHÉs/@·-G@-©`›\Zs/@ÜdÏG@Bß%s/@}*†G@®ñ„/s/@óÅ,ÞG@Ùª³ã7s/@w!™cÿG@PÝAs/@zOöüG@‘t·ÀMs/@Ê.›ÖúG@W…_e]s/@w;yùG@e­‰tts/@š¢ýöG@Ñ„»”s/@S`ùåôG@±å¡´s/@»÷‡óG@ÉSÔÏs/@Ê5@DòG@Ê„Sñs/@<zòG@¥HÖHt/@Ï\n±ÏñG@8Wt/@«ôÚðG@Þôz(t/@äò=îG@׎¬/9t/@‚áoéG@•‡\0Kt/@ûq\0äG@kª†Xt/@n”TTßG@%-šmjt/@ÒÃ|‡ÛG@a =‰t/@\Zñ‡ÕG@‚~bÉt/@bnåÈG@’Oƒøt/@Ñ»oÙ¿G@r¶¡ãu/@F+BºG@ðèð9u/@õO‘¶G@õmeVu/@íójB´G@¬íæ_gu/@’''™²G@žº’îou/@›CØ°G@è1Bou/@Ž­G@8è’ju/@ýEŒªG@|¯Yu/@#H|L¦G@V8ÏHu/@ò†M¢G@¹¡_„0u/@ÑÞ„žG@ø*È>/u/@ä]*RžG@s«®\0\ru/@› ššG@Ãbát/@m«NÈ—G@[÷¾t/@)hNè“G@…!E‹t/@‘FÕŽG@[$ïtbt/@ŠuŠG@8#dJt/@c€ÌD‡G@윔Î.t/@žZ.†G@4/bt/@qx›\Z†G@¶´·¯òs/@iŒ¶&†G@×Í>¼Õs/@Ãís³†G@ÃW‡@µs/@RqÈG@B-Ä…¡s/@B^µŠG@Ò3©‘s/@9Tþ5‰G@å»Øáˆs/@†ÍÀ†G@£ã…s/@S»ÌƒG@j)jm†s/@(E瘀G@üÊqцs/@\0{\0zG@ÂÄas/@Ë/c¸wG@¬¹…÷‘s/@d1oLsG@’€Ms/@c¹pG@©Æ+̤s/@àv¬lG@} ±s/@°{§,hG@»Bi,¿s/@ÆÇúœcG@sbæ1Ïs/@JJ‹#`G@ø;·rÑs/@''>v¦_G@§`]Ös/@òc±]G@\Z¯žØs/@ZÂ`Ë\\G@/à/?Ýs/@µeòWG@ïú®ùës/@³¾â¿RG@®žéñs/@M.ö±NG@pÿ^òs/@ ÍaNG@<Éhýs/@rÙ–LG@¸*Bt t/@<ŸˆIG@Þù)t/@ËGò>DG@ûÄj(t/@A©ÂK@G@¡›ãÕ-t/@:íB=G@o,5t/@Ÿ²@;G@a¬t*Bt/@ ¤‘8G@!zKt/@L¬ž6G@lj}Ut/@Ы¼¹4G@}Ö¼\\wt/@›É¤û.G@JI&4œt/@ÖD¨(G@2Jæš±t/@‘&¡#G@âq^³±t/@8Ûe›#G@“º»MÇt/@ï  G@‘£ßt/@™(FÏG@ª8W÷t/@¿¼¹UG@íQñGu/@º3æGG@²Þ2Ýu/@_¶L¶G@âR€u/@j|æ’G@''‚Öau/@½-ÞùG@ö¹­)u/@óèP‡G@-x1Ju/@È3¤G@˜Ôî%u/@Û$ÍG@H‘ðu/@<˜G@UþBu/@=JPýG@¾ß"u/@K›tãúG@Oºw¤#u/@†‘ËÁúG@HO]N,u/@“;­GùG@eæß?u/@B_LöG@ÌvmÝVu/@áó×óG@˜§Ev[u/@¥2ÄðG@@TÏl_u/@â+qgíG@ɽ\Zeu/@[]a…çG@:ø )gu/@g-áG@é’du[u/@>6wMÞG@úmNƒUu/@­V¦óÙG@ˆøÆQu/@ÔKÿÕG@¥K?MQu/@–ÑKÒG@œu~Vu/@¹Ã[õÎG@­È­ø]u/@ ÛñoÌG@D¦Åhu/@ÙŠ˜,ÊG@¤DÕ£wu/@Yá¿ÈG@+\Z‰u/@a¦­ÇG@lV3\r¤u/@׬œ?ÆG@ €ì¸u/@R½JJÅG@3}qaÂu/@èjûÄG@¢U§½Èu/@Í-)ÂG@j(Íu/@è.P¿G@`ûfåÑu/@ÂÁ¸F»G@þ¨²Öu/@œ™? ¸G@–Çû’Þu/@‰Œû]¶G@ÏÀéu/@3%´G@LhÝ]üu/@ß6$±G@]‘ó  v/@ ©Zð®G@0s+v/@¥Éæ¬G@¤]¶v/@ŽòרG@˜.ôæ\Zv/@®÷—Š¤G@h v/@"á\0M—G@Ðitv/@ׄ½’G@ðüv/@Ý5­BŽG@µ3 \nv/@é¨þ‹G@ZTLv/@øP{‰ˆG@r;$P÷u/@ÏV’>„G@ëàrYëu/@˜wÒ9G@à°y!Ýu/@ðÿMy~G@ÐfÃu/@g"òázG@3H¹Œ­u/@kU¸HwG@䉽;šu/@‰ôó™rG@ÿQJu/@ÜâroG@¶‰Š)‰u/@F>#klG@PC´ú€u/@û]ŸªhG@ˆÚzu/@0EóLfG@Á¼©pu/@òÔ¦UdG@€]"X[u/@\0³''0bG@gÖæˆMu/@Ç>\\`G@Ð\n|–Fu/@!¤……^G@''Ú9ôDu/@×Oi\\G@íµ PFu/@DmÅ^YG@¨®ÍHu/@¡žîUG@_¶WéJu/@Ål RG@£y¯OMu/@e¡ÆMG@™3¯äKu/@FpmHG@,šlAHu/@bä;‰DG@^J+îCu/@¾äPBG@æˆO\\=u/@y^ßþ?G@Î2¿.u/@‘šþ=G@œ—7Ru/@Óœ79G@˜¡q‹u/@+ê©ñ4G@ÖŒ„u/@³ì%–1G@÷fáÔ  u/@%ó\Z|.G@|´zºu/@&í“´+G@"¬+u/@OÉó\\)G@Þ_µ™u/@lW™%G@#§G[)u/@õŽ(''G@$t/“4u/@EIroG@q/;^>u/@l”ÂG@¤¿²¯Lu/@³ê‰G@ß|Smau/@^GnG@Ê  »Çuu/@ÃÖ¤ÃG@”1î‡u/@èÐ…\ZG@7úHd•u/@/U€G@>bo¿¡u/@¢ôeöG@uß®u/@&\nP-\0G@ï‹}r·u/@Tñ-ºüG@sU~ø¹u/@œ^Ì6úG@²eóºu/@걓\n÷G@~‹W)¸u/@bÍôG@Y0ø±u/@Üa*ÔòG@ug#k¨u/@müñG@INñ®šu/@i(q‹ñG@7ŸVˆu/@Š"ÈðG@Vÿ•ru/@MðFwïG@Éúeäbu/@i¶ÖíG@Fà;Uu/@ZÛ:ÐëG@ˆ+ìOu/@‘D4éG@t.Mu/@z 6æG@ä€3sHu/@èY;ãG@ÒŸng>u/@x9„9àG@"‚ƒX1u/@3òïÝG@JT2u/@ïv\n–ÛG@7¯u/@%F\0ØG@—ÍH0ôt/@‰œìÄÔG@');

--
-- Indexes for dumped tables
--

--
-- Indexes for table `wkt_linija`
--
ALTER TABLE `wkt_linija`
  ADD PRIMARY KEY (`id`);

--
-- AUTO_INCREMENT for dumped tables
--

--
-- AUTO_INCREMENT for table `wkt_linija`
--
ALTER TABLE `wkt_linija`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT,AUTO_INCREMENT=2;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

這是圖片。 我不知道為什么，但是當我導出表格時，我在幾何行中得到了奇怪的符號，就像這樣的“/ @‰œìÄÔG@”。 是否因為我在創建幾何場時選擇了GeomFromText函數？

真正的問題是這個。 當我使用這段代碼從MySQL提取數據並轉換為GeoJSON時：

<?php

include_once('geoPHP/geoPHP.inc');

$conn = new PDO('mysql:host=localhost;dbname=web_gis;charset=utf8','neven','gis',array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'));

$sql = 'SELECT *, geometry AS wkt FROM wkt_linija';

$rs = $conn->query($sql);
if (!$rs) {
    echo 'An SQL error occured.\n';
    exit;
}

$geojson = array(
   'type'      => 'FeatureCollection',
   'features'  => array()
);

while ($row = $rs->fetch(PDO::FETCH_ASSOC)) {
    $properties = $row;

    unset($properties['wkt']);
    unset($properties['geometry']);
    $feature = array(
         'type' => 'LineString',
         'geometry' => json_decode(($row['wkt'])),
         'properties' => $properties
    );

    array_push($geojson['features'], $feature);
}
header('Content-type: application/json');
echo json_encode($geojson, JSON_NUMERIC_CHECK);
$conn = NULL;
?>

幾何字段被忽略，我得到沒有任何幾何的結果，如下所示：

{"type":"FeatureCollection","features":[{"type":"LineString","geometry":null,"properties":{"id":1,"oznaka":"K-8","opis":"D206 - Vulica - Kraljevec - Horvati - Kordej - S1","sirina":"5 m","podloga":"Asfalt-makadam","mo":"Kostel"}}]}

如果我沒有弄錯的話應該得到這樣的東西：

{"type": "FeatureCollection","features": [
{ "type": "Feature", "properties": { "OBJECTID": 857, "OZNAKA": "K-8", "OPIS": "D206 - Vulica - Kraljevec - Horvati - Kordej - S1", "�IRINA": "5", "PODLOGE": "Asfalt-makadam", "DULJINA": 2.714530, "SHAPE_Leng": 2714.529879, "JLS": "Pregrada", "MO": "Kostel" }, "geometry": { "type": "LineString", "coordinates": [ [ 15.724070907944066, 46.188443457771676 ], [ 15.724257815619874, 46.188344185018963 ], [ 15.724433034034641, 46.188218470155633 ], [ 15.72455940264949, 46.188111948013024 ], [ 15.724699297027877, 46.187990209886379 ], [ 15.724812369870586, 46.187860416649634 ], [ 15.72489216542548, 46.187729597634622 ], [ 15.72497191850638, 46.187587520467694 ], [ 15.725035777742436, 46.18748135544859 ], [ 15.725105549827283, 46.187407292181923 ], [ 15.725202581781817, 46.187342477581822 ], [ 15.725321929846059, 46.187288459964229 ], [ 15.725497857862772, 46.187225059863707 ], [ 15.725739143267136, 46.18716120411468 ], [ 15.725983191502424, 46.187106791868665 ], [ 15.726194987431329, 46.187080890038104 ], [ 15.726450533317252, 46.187073593715894 ], [ 15.726602817685782, 46.187066995092771 ], [ 15.726732946011916, 46.187037820050442 ], [ 15.726868107327785, 46.186958068465223 ], [ 15.726998796285825, 46.18681143294458 ], [ 15.72713472037392, 46.186645560888834 ], [ 15.727237900023473, 46.186502972887737 ], [ 15.727374482221942, 46.186387000961659 ], [ 15.727609563629075, 46.186189834001382 ], [ 15.72809649660417, 46.185818387861914 ], [ 15.728458503155057, 46.185542277867746 ], [ 15.728743661394422, 46.185371657495338 ], [ 15.728957680163198, 46.185259021798828 ], [ 15.729172360784085, 46.185188581679405 ], [ 15.72930431074095, 46.185137873121803 ], [ 15.729369597827198, 46.185060721013734 ], [ 15.729363091545522, 46.184984028820601 ], [ 15.729328718981932, 46.184892184228353 ], [ 15.729199870961573, 46.184762535747971 ], [ 15.729071126927163, 46.184640592675251 ], [ 15.728885780977054, 46.184525116727102 ], [ 15.728876077589561, 46.184519072234053 ], [ 15.728614827463138, 46.184405640049697 ], [ 15.728282035417173, 46.184319532788187 ], [ 15.728019456787038, 46.184201277050597 ], [ 15.727625044660053, 46.184046453459025 ], [ 15.727313665573254, 46.183902676002639 ], [ 15.72713005952758, 46.183815574507001 ], [ 15.726919608727677, 46.183782381293177 ], [ 15.726687496419437, 46.183780027306859 ], [ 15.726460925269162, 46.183781470427512 ], [ 15.72624004618312, 46.183798247915114 ], [ 15.725992218514767, 46.183861189085874 ], [ 15.725841694066393, 46.183920515406967 ], [ 15.725715865521043, 46.183874844726638 ], [ 15.725653703409941, 46.18379975520206 ], [ 15.725630852584601, 46.18370970853416 ], [ 15.725634974679185, 46.183611977505564 ], [ 15.725637955799805, 46.183427810892681 ], [ 15.725685548243181, 46.183341072493555 ], [ 15.725723013948333, 46.183206133168625 ], [ 15.725809501193257, 46.183107700844715 ], [ 15.725866680473091, 46.183003917087035 ], [ 15.725960645833988, 46.182866651324161 ], [ 15.726067912911608, 46.182727453662253 ], [ 15.726190146802059, 46.182621424687184 ], [ 15.726207337253058, 46.182606513725027 ], [ 15.726244838952267, 46.182546780957537 ], [ 15.726262053423898, 46.182519361730286 ], [ 15.726297354311184, 46.182371391634128 ], [ 15.726409723863496, 46.182212815966885 ], [ 15.726455021424353, 46.182089085774898 ], [ 15.726458519588704, 46.1820795299138 ], [ 15.726542714259828, 46.182008813530857 ], [ 15.726634629323016, 46.181917731008497 ], [ 15.726792632784449, 46.181770199109074 ], [ 15.726870857759003, 46.181649656342877 ], [ 15.726912197145625, 46.181557050493623 ], [ 15.72696727853892, 46.181495749681858 ], [ 15.727067305319169, 46.181413846381595 ], [ 15.727138343041192, 46.181354299035405 ], [ 15.727214739777891, 46.181296555637914 ], [ 15.727473161746497, 46.181121306860597 ], [ 15.727754239724749, 46.180928261966685 ], [ 15.727917519198943, 46.180774825857164 ], [ 15.727918248442567, 46.180774140104802 ], [ 15.728083066145052, 46.180681243365932 ], [ 15.728268727778216, 46.180597218758699 ], [ 15.728449559847867, 46.180521693889652 ], [ 15.728548286636363, 46.180459010508869 ], [ 15.728575622997003, 46.180441653687687 ], [ 15.728626260838556, 46.180345881025303 ], [ 15.728632981715306, 46.180266602979351 ], [ 15.728631308037603, 46.180130877024475 ], [ 15.728609388865232, 46.180042767469388 ], [ 15.72863119640742, 46.179925578113505 ], [ 15.728675382393831, 46.179736203157688 ], [ 15.728754103415818, 46.179605518578782 ], [ 15.728781671000469, 46.179531509339164 ], [ 15.728787555327612, 46.17952749671808 ], [ 15.728853653803199, 46.179482421480451 ], [ 15.729002926254177, 46.179391428482766 ], [ 15.729178351986228, 46.179316475034064 ], [ 15.729213424685256, 46.17922260735417 ], [ 15.729243660267571, 46.179119997271997 ], [ 15.729286990802217, 46.178940460721343 ], [ 15.729302693271269, 46.178746820197198 ], [ 15.729213398482402, 46.178659136971405 ], [ 15.729168036769796, 46.178526359767922 ], [ 15.729134552992278, 46.178405644044375 ], [ 15.72913590810442, 46.178292729463621 ], [ 15.729175521649999, 46.178190870100885 ], [ 15.729232569898466, 46.178113930791596 ], [ 15.729312949540265, 46.178044867023068 ], [ 15.729428405555446, 46.177993744555984 ], [ 15.729561627668394, 46.177968698730346 ], [ 15.729767239109798, 46.177925063611546 ], [ 15.729926481857566, 46.177895819181359 ], [ 15.729998631576199, 46.177859065783025 ], [ 15.730047156025481, 46.177800306667997 ], [ 15.730080843602126, 46.177713416007506 ], [ 15.730117005177533, 46.177590217793764 ], [ 15.730153622997474, 46.177509337477403 ], [ 15.730213731036013, 46.177440402819293 ], [ 15.730294124893048, 46.177372576295973 ], [ 15.730441029813072, 46.177280928037128 ], [ 15.730544656814056, 46.177213711041304 ], [ 15.730607373995639, 46.177126634301466 ], [ 15.730649660998102, 46.177027590548377 ], [ 15.730673997218489, 46.176896404459839 ], [ 15.730686159036875, 46.176492333821685 ], [ 15.730678213040187, 46.176331131495026 ], [ 15.730644702457511, 46.17621644456424 ], [ 15.730591136985689, 46.176118015618904 ], [ 15.730532059952845, 46.176041779721288 ], [ 15.730402473852994, 46.175910779432904 ], [ 15.730311198495164, 46.175818660514039 ], [ 15.730202718834732, 46.175734675489252 ], [ 15.730003845739928, 46.175625079374008 ], [ 15.729839704148707, 46.175515260702774 ], [ 15.729692332160035, 46.175372356528051 ], [ 15.729618528196623, 46.175276053085071 ], [ 15.729562090073937, 46.175183670242902 ], [ 15.729499659065965, 46.175069167915318 ], [ 15.72944644429414, 46.1749969661563 ], [ 15.729370166749847, 46.174936968289231 ], [ 15.729212526507354, 46.174871463188538 ], [ 15.729107168367774, 46.174815683654337 ], [ 15.729054167405963, 46.17475956941076 ], [ 15.729041702329665, 46.17469517134213 ], [ 15.72905208551216, 46.174602362060369 ], [ 15.729071071151182, 46.174497439541717 ], [ 15.729087154347495, 46.174396528594606 ], [ 15.72910546319037, 46.174248531959883 ], [ 15.729094644915493, 46.17408531172007 ], [ 15.729066891200169, 46.17396655487461 ], [ 15.729033892425999, 46.173890151499549 ], [ 15.728983769139131, 46.173827990595733 ], [ 15.728872275277265, 46.173739313429117 ], [ 15.728754586492691, 46.173621131114167 ], [ 15.72865710985279, 46.173490722623988 ], [ 15.72860349855311, 46.173388260381579 ], [ 15.728590633883398, 46.173293603095125 ], [ 15.728612735251083, 46.173208782415074 ], [ 15.728646626318611, 46.173137301479635 ], [ 15.728726199522438, 46.173007798074508 ], [ 15.728831150528611, 46.172825712970656 ], [ 15.728916739981351, 46.172712260059178 ], [ 15.72899145576932, 46.172630617446742 ], [ 15.729100695199868, 46.172549311964211 ], [ 15.729258934441928, 46.172437431420562 ], [ 15.729414216596428, 46.172325568664313 ], [ 15.729546276642203, 46.172213855113853 ], [ 15.729655393513083, 46.172107398664927 ], [ 15.729749662729883, 46.171995925696379 ], [ 15.729846939429743, 46.171880401689393 ], [ 15.729915216279521, 46.171775124009088 ], [ 15.729934468671422, 46.171698426999882 ], [ 15.729941946170445, 46.171601602665604 ], [ 15.729920665680535, 46.17153322935043 ], [ 15.729873420226953, 46.171473046011414 ], [ 15.729800556251329, 46.171447282199416 ], [ 15.7296957654536, 46.171433859112604 ], [ 15.729553262542693, 46.171410576691585 ], [ 15.729389846247617, 46.171370420110726 ], [ 15.729270112465558, 46.171320761745136 ], [ 15.729164786156741, 46.171258953798954 ], [ 15.729123053626395, 46.17117657711163 ], [ 15.729104461899636, 46.171087984683425 ], [ 15.729068374669119, 46.170993474941326 ], [ 15.728991729978507, 46.170905294001329 ], [ 15.728892103245986, 46.170835384142627 ], [ 15.728746006764606, 46.170763735875759 ], [ 15.728573253271504, 46.170655965932646 ], [ 15.728425511252494, 46.170555701764052 ] ] } }
]
}

我不知道我錯過了什么。 它是.php代碼塊中的東西，還是我創建表並在創建幾何字段時選擇了錯誤的函數時失敗了，真的不知道。

感謝您對問題的任何幫助或建設性批評。

UPDATE

即使在上面提到的.php文件中包含這段代碼（從這里復制https://github.com/phayes/geoPHP）

<?php
include_once('geoPHP/geoPHP.inc');

function wkt_to_json($wkt) {
  $geom = geoPHP::load($wkt,'wkt');
  return $geom->out('json');
}
...

我注意到了

注意：未定義的偏移量：第23行的C：\\ xampp \\ htdocs \\ PHP-GEOJSON \\ MySQL_LINIJA \\ geoPHP \\ lib \\ adapters \\ WKT.class.php中的1

和

致命錯誤

致命錯誤：在第16行的C：\\ xampp \\ htdocs \\ PHP-GEOJSON \\ MySQL_LINIJA \\ line.php中調用null上的成員函數out（）

Answer 1

我簡單的解決方法是使用MySQL將POINT和LINESTRING幾何轉換為GeoJSON。 在我的例子中，單個表存儲了點和線串幾何，但是對於單部分多邊形和多點，這可以很容易地擴展：

SELECT
  IF(LENGTH(AsText(network_objects.geometry)) = 0,
   'null',
  IF(LOCATE('POINT',AsText(network_objects.geometry)),
  CONCAT('{"type": "Point", "coordinates":',
    REPLACE(
        REPLACE(
            REPLACE(
                AsText(network_objects.geometry), ' ', ','
            ),
            'POINT(', '['
        ), ')', ']'
    ),'}'
  ),

  IF(LOCATE('LINESTRING', AsText(network_objects.geometry)),
    CONCAT('{"type": "LineString", "coordinates":',
    REPLACE(
        REPLACE(
            REPLACE(
                REPLACE(
                    AsText(network_objects.geometry), ',' ,'],['
                ),
                ' ',','
            ),
            'LINESTRING(', '[['
        ),')',']]'
    ),'}'),
    'null'
  )
    )
) as geometry_type_string
FROM geometry_table;

這將輸出“幾何”的值： - GeoJSON對象的屬性

{"type": "LineString", "coordinates":[[15.42324565,60.38242968],[15.42307974,60.38252172]]}

Answer 2

在一些幫助下（公平地說他們真的很有幫助）我終於明白了。

所以這里是交易。 在幾何字段（MySQL）中，我使用了GeomFromText函數，對於VALUE使用的格式如下：

'LINESTRING(15.710658104182732 46.20239760250581,15.710776991330624 46.202150210442475,15.710822931962284 46.20192080948476,15.710831682524589 46.20165203949391,15.710829367910724 46.201478170096806,15.710778748807499 46.201345541255364,15.710749581923572 46.20098083884202,15.710768970490234 46.200904345256404,15.710812698319572 46.200819215538004,15.710877059895306 46.2007537567,15.710904378497835 46.20066024293927,15.710912159473589 46.20039950452849,15.710894434522887 46.20028929894646,15.710844620624444 46.20021889590132,15.710754497671333 46.20018268546197,15.710619472746819 46.200141098973376,15.710468078447006 46.20009395676996,15.710300020035252 46.20001863058078,15.71013294549417 46.200019670809,15.710063999207861 46.20004555880265,15.709954779718144 46.20010846583362,15.709825367334812 46.200185643990416,15.709740155452225 46.20021445995833,15.7095978600008 46.20024080222257,15.709435298637604 46.20027575661596,15.709362166147757 46.20029318215561,15.709321746574172 46.200318892298654,15.70924501465025 46.2003731121604,15.709176908852976 46.20046404855626,15.70912593824907 46.2006199379506,15.709082098558873 46.200696581456555,15.709041746284855 46.20072794679033,15.708980768498824 46.20073963902233,15.708833996835912 46.20073489545015,15.70867866945619 46.200699088541356,15.708441515485225 46.200638334448556,15.70831071551633 46.200608030417,15.708025541089574 46.20061546014786,15.707936251453559 46.200644298279066,15.707786277558592 46.20070745795111,15.707623895583048 46.200756550625464,15.707461001390076 46.20076604727856,15.707318051223131 46.20074147497647,15.707207479007135 46.20069973463324,15.707066607106702 46.20060074856272,15.70664318279083 46.20030616960038,15.705882062458974 46.19972242368199,15.70511493399327 46.19906980655475,15.704648034594763 46.1987219944351,15.70450919728616 46.19858019598824,15.704291928591257 46.19833188738757,15.704161428771785 46.198172204352296,15.703537141003846 46.19756976517491,15.703216667780048 46.197286427418,15.702992669467902 46.197180815640245,15.702837928060974 46.19713421658259,15.702717672096156 46.19710523755276,15.70259748698871 46.19708220158732,15.701539642071204 46.19672612421737,15.701342168546992 46.19668573136494,15.701050429965196 46.19663997213334,15.700655562790246 46.196565125734026,15.700286457978665 46.19649606343836,15.700088834888449 46.196443782082085,15.699934103148394 46.196397179030086,15.699769973735597 46.1962852481137,15.699587967151555 46.19611398852277,15.699336247021442 46.19584804901749,15.699059302528688 46.19561793070997,15.698759082297304 46.195383057970396,15.698344688297988 46.195118114465565,15.698137525323025 46.19498861375236,15.698007207286828 46.1948408097566,15.697833392097015 46.19463977545958,15.697738075051644 46.19455119870973,15.697513417413118 46.19439208391872,15.696752249589233 46.19379044428983,15.696406296846584 46.19351913197643,15.69616377139154 46.19330068008819,15.695964208560289 46.19309385821015,15.695790263799942 46.19288093427891,15.695446508778891 46.192414313313975)',4326

似乎MySQL表中的數據存儲在WKB中，但不知何故，當我查看它時，它會自動轉換為WKT！？

我真的不確定為什么會這樣或如何發生但是從MySQL表中提取數據並轉換為GeoJSON我使用geoPHP庫和這些代碼行：

// library downloaded from here https://github.com/phayes/geoPHP
include_once('../geoPHP/geoPHP.inc');

// function for calling wkb_to_json processor
function wkb_to_json($wkb) {
    $geom = geoPHP::load($wkb,'wkb');
    return $geom->out('json');
}

// checking if databasestring is UTF8 
$conn = new PDO('mysql:host=localhost;dbname=web_gis;charset=utf8','neven','gis',array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'));

// using  AsBinary on geometry field
// Converts a value in internal geometry format to its WKB representation and returns the binary result
$sql = 'SELECT *, AsBinary(geometry) AS wkb FROM wkt_line';

$rs = $conn->query($sql);
if (!$rs) {
    echo 'An SQL error occured.\n';
    exit;
}

$geojson = array(
   'type'      => 'FeatureCollection',
   'features'  => array()
);

while ($row = $rs->fetch(PDO::FETCH_ASSOC)) {
    $properties = $row;

    unset($properties['wkb']);
    unset($properties['geometry']);
    $feature = array(
         'type' => 'Feature',//outer feature
         'geometry' => json_decode(wkb_to_json($row['wkb'])),
         'properties' => $properties
    );

    array_push($geojson['features'], $feature);
}

header('Content-type: application/json');
echo json_encode($geojson, JSON_NUMERIC_CHECK);
$conn = NULL;

它奏效了！ 請享用...