GIS開發:geojson資料匯入mysql資料庫
阿新 • • 發佈:2020-12-15
使用nodejs,實現將geojson空間圖層資料,匯入到mysql資料庫中。
具體的實現程式碼:
//引用fs、mysql和Geojson2Wkt的類庫
var fs = require("fs");
var mysql = require('mysql');
//Geojson2Wkt是將geojson中的座標轉換成wkt的形式
var Geojson2wkt = require('Geojson2Wkt');
//設定mysql的連線資訊
var connection = mysql.createConnection ({
host: 'localhost',
user: 'root',
password: '123456',
database: 'databasename'
});
//開啟資料庫連線
connection.connect();
var sql = [];
fs.readFile('geojson圖層檔案', {
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;
//將geojson座標轉換成wkt形式
for (var i = 0; i < arr.length; i++) {
brr[i] = arr[i].geometry;
drr[i] = arr[i].properties;
crr[i] = Geojson2wkt.convert(brr[i]);
}
for (var j in drr[0]) {
k++;
data[k] = j;
}
//獲得geojson資料的空間型別,mysql需要根據不同的空間型別設定欄位
var tdata = arr[0].geometry.type;
tdata = tdata.toLowerCase();
//建立mysql資料表的sql語句
sqla = "CREATE TABLE IF NOT EXISTS `tablename`( `" + data[1] + "` VARCHAR(100) NOT NULL, `" + 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);
//拼接sql語句,迴圈寫入到圖層中的資料
for (var t = 0; t < arr.length; t++) {
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]);
}
});
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