NodeJs如何将变量传递给导出函数

Question

I have NodeJs restful api made by tutorial. And in my endpoint I want to pass export function. For example:

// main.js
REST_ROUTER.prototype.handleRoutes = function(router, connection, md5) {
    router.get("/create", function(req, res) {
        var query = ... 
        connection.query(query,function(err, row) {...}
    });
}

But I want to do it like this:

// main.js
var example = require('./example.js');

REST_ROUTER.prototype.handleRoutes = function(router, connection, md5) {
    router.get("/create", example.create);
}

// example.js
exports.create = function(req, res) {
    var query = ... 
    connection.query(query,function(err, row) {...}
}

However, my connection is not available in example.js. How can I pass it?

Answer 1

Something like this might help:

// main.js
var example = require('./example.js');

REST_ROUTER.prototype.handleRoutes = function(router, connection, md5) {
    router.get("/create", example.create(connection));
}

// example.js
exports.create = function(connection) {
    return function(req, res) {
       var query = ... 
       connection.query(query,function(err, row) {...}
    }
}

Answer 2

Bind example to create example.create.bind(example,connections)

// main.js
var example = require('./example.js');

REST_ROUTER.prototype.handleRoutes = function(router, connection, md5) {
    router.get("/create", example.create.bind(example,connections));
}

// example.js
exports.create = function(connection, req, res) {
    var query = ... 
    connection.query(query,function(err, row) {...}
}