How to import data into mysql database in geojson
This article is about how to import the data into the mysql database in geojson. The editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.
Use nodejs to import geojson spatial layer data into mysql database.
Specific implementation code: / / reference the class libraries of fs, mysql and Geojson2Wkt
Var fs = require ("fs")
Var mysql = require ('mysql')
/ / Geojson2Wkt is to convert the coordinates in geojson into wkt.
Var Geojson2wkt = require ('Geojson2Wkt')
/ / set the connection information for mysql
Var connection = mysql.createConnection ({
Host: 'localhost'
User: 'root'
Password: '123456'
Database: 'databasename'
});
/ / Open database connection
Connection.connect ()
Var sql = []
Fs.readFile ('geojson layer file', {
Encoding: "utf-8"
}, (err, data) = > {
Let jsonobj = JSON.parse (data)
Var arr = jsonobj.features
Var brr = []
Var crr = []
Var drr = []
Var data = []
Var k = 0
Var sqla
/ / convert geojson coordinates to wkt form
For (var I = 0; I < arr.length; iTunes +) {
Brr [I] = arr [I].
Drr [I] = ARR [I] .properties
Crr [I] = Geojson2wkt.convert (brr [I])
}
For (var j in drr [0]) {
Kicking +
Data [k] = j
}
/ / get the space type of geojson data. Mysql needs to set fields according to different space types.
Var tdata = arr [0] .geometry.type
Tdata = tdata.toLowerCase ()
/ / create sql statements for mysql data tables
Sqla = "CREATE TABLE IF NOT EXISTS `tablename` (`" + data [1] + "`tablename`,`" + data [2] + "`VARCHAR (100) NOT NULL, `" + data [3] + "`VARCHAR (100) NOT NULL,`" + data [4] + "`VARCHAR (100) NOT NULL, `" + data [5] + "`VARCHAR (100) NOT NULL, `geometry`" + tdata + "NOT NULL)"
Connection.query (sqla)
/ / concatenate sql statements to cycle through the data written to the layer
For (var t = 0; t < arr.length; tasking +) {
Sql [t] =
"insert into tablename (" + data [1] + "," + data [2] + "," + data [3] + "," + data [4] + "," + data [5] + ", geometry) values ('" + drr [t] [data [1]]) + ",'" + drr [t] [data [2]] + "," + "'" + drr [t] [data [3]] + ",'" + drr [t] [data [4]] + "' "+"'"+ drr [t] [data [5]] +"'"+", GeomFromText ('"+ crr [t] +"') "
Connection.query (SQL [t])
}
});
The above is how to import the data into the mysql database in geojson. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.
