db.js

+const mysql = require('mysql');
+const cnf = require('/cnf.js').AWSMYSQL
+
+const pool = mysql.createPool({
+    connectionLimit : cnf.connectionLimit,
+    host            : cnf.host,
+    user            : cnf.user,
+    password        : cnf.password,
+    database        : cnf.database
+});
+
+exports.getLngLat = (fail, done) => {
+    pool.getConnection((err, conn) => {
+        if(err) {
+            return fail(err);
+        }
+        let sql = 'SELECT * FROM test';
+        conn.query(sql, (err, rows) => {
+            if(err) {
+                return fail(err);
+            }
+            conn.release();
+            done(rows);
+        });
+    });
+}