小编Bak*_*aya的帖子
MySQL Recursive从父级获取所有子级
我有这种情况使用Mysql上的递归查询在一个表上找到lv 2和lv3子...
我正在使用的数据库结构:
id name parent
1 A 0
2 B 0
3 C 0
4 D 1
5 E 1
6 F 2
7 G 2
8 H 3
9 I 3
10 J 4
11 K 4
我期望的结果,当过滤数据时,id = 1,它将产生我期待的结果.
id name parent
4 D 1
5 E 1
10 J 4
11 K 4
或者这就是例证.
我一直在寻找各地,并阅读这个http://mikehillyer.com/articles/managing-hierarchical-data-in-mysql/,但我没有找到我正在寻找的结果..
任何帮助将不胜感激, 谢谢
7
推荐指数
推荐指数
3
解决办法
解决办法
2万
查看次数
查看次数
使用 Mapbox-GL.JS 沿路线设置多个点的动画
我在使用以下示例时遇到问题：
沿路线设置点动画
我想要实现的是在同一个地图容器中制作另一个点和路线。
到目前为止我尝试的是这个
mapboxgl.accessToken = 'pk.eyJ1IjoicGFwYWJ1Y2t0IiwiYSI6ImNqa2k3azQ1dzA1Zmgza3B1czIxOGhhaW4ifQ.h5OT3NaQf0vcxx3g1q1cXw';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v9',
center: [118.0148634, -2.548926],
zoom: 4.1
});
var route = {
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"geometry": {
"type": "LineString",
"coordinates": [
[117.66769409179686,3.2913401805277034],[117.75009155273438,3.2419820359767444],
[117.81188964843751,3.2008484073844365],[117.93273925781249,3.1514858749293237],
[118.048095703125,3.0637245031869744],[118.20190429687501,2.9649843693339677],
[118.35571289062499,2.855262784366583],[118.443603515625,2.789424777005989],
[118.597412109375,2.67419944615503],[118.817138671875,2.4656692707025543],
[118.93798828125,2.191238104506552],[118.97644042968749,1.9442068658308456],
[119.0643310546875,1.6477220517969353],[119.13574218749999,1.334718132769963],
[119.15222167968751,1.0051974541602744],[119.05334472656249,0.5987439850125229],
[118.9215087890625,0.29113644247137116],[118.8006591796875,-0.027465819260582135],
[118.597412109375,-0.5163504323777461],[118.27880859375001,-0.8953492997435784],
[118.16894531249999,-1.219390359762202],[117.83935546874999,-1.6641946615712557],
[117.7349853515625,-1.8618548574369598],[117.65258789062499,-2.0485136203038063],
[117.40539550781249,-2.67968661580376],[117.07580566406249,-3.2721456350750127],
[116.7572021484375,-3.8806964824972487],[116.44958496093749,-4.209464815163466],
[115.7574462890625,-4.335456463573485],[115.213623046875,-4.510714125698484],
[114.6533203125,-4.647604837557583],[114.1864013671875,-4.70235372255946],
[113.79089355468749,-4.7242520745232515],[113.4228515625,-4.8118385341739005],
[112.9669189453125,-4.8282597468669755],[112.28576660156249,-4.844680562025358],
[111.104736328125,-4.855627550617055],[110.7366943359375,-4.855627550617055],
[110.19287109375,-4.855627550617055],[109.60510253906249,-4.926778627933801],
[109.00634765625,-5.00339434502215],[108.4075927734375,-5.036226914872183],
[108.116455078125,-5.189423479732417],[107.5177001953125,-5.369928743247035],
[107.061767578125,-5.473831889192786],[106.76513671875,-5.544913134097361],
[106.44653320312499,-5.626919311742117],[106.248779296875,-5.747174076651375],
[106.1444091796875,-5.807291968003861],[106.02948188781738,-5.882003409958776]
]
}
},
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "LineString",
"coordinates": [
[-252.99316406250003,-5.932972207945653],[-252.92724609374997,-5.774501181937723],
[-252.872314453125,-5.697981985463135],[-252.8118896484375,-5.572249801113899], …2
推荐指数
推荐指数
1
解决办法
解决办法
2460
查看次数
查看次数