node-red-contrib-alasql/node-red-contrib-alasql.js

Node-RED wrapper for AlaSQL database and XLSX import/export

module.exports = function(RED) {
	var alasql = require('alasql');

	function AlasqlNodeIn(config) {
		RED.nodes.createNode(this, config);
		var node = this;
		node.query = config.query;
		node.on('input', function(msg) {
			var sql = this.query || msg.query || msg.topic || 'SELECT * FROM ?';
			var bind = Array.isArray(msg.payload) ? msg.payload : [msg.payload];
			alasql
				.promise(sql, bind)
				.then(function(res) {
					msg.payload = res;
					node.status({fill: 'green', shape: 'dot', text: ' Records: ' + msg.payload.length});
					node.send(msg);
				})
				.catch((err) => {
					node.error(err, msg);
				});
		});
		this.on('close', () => {
			node.status({});
		});
	}

	RED.nodes.registerType('alasql', AlasqlNodeIn);
};