Azure 上的 SQL Server 连接到 REST API Express.js/Node.js [TypeError: req.sql is not a function]

Question

Hi im having an issue connecting to Azure SQL Server with express4-tedious. I am trying to make an app in react-native with Node/Express server (REST API) but after express4-tedios setup in express this error came up: req.sql is not a function

TypeError: req.sql is not a function

this is my app.js on server Folder

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var cors = require("cors");
var tediousExpress = require('express4-tedious');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var testAPIRouter = require("./routes/testAPI");

var app = express();

app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(cors());
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use("/testAPI", testAPIRouter);

app.use(function (req, res, next) {
  req.sql = tediousExpress(req, 
    {
    "server"  : "something.database.windows.net",
    "userName": "something",
    "password": "something",
    "options": { "encrypt": true, "database": "something" }
    }
    );
  next();
});

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;

and this is my testAPI.js where I am running req.sql() function

var express = require("express");
var router = express.Router();

router.get('/', function (req, res) {

  req.sql("select * from Persons for json path")
      .into(res);

});

module.exports = router;

I really appreciate anybody's help. :)

Answer 1

Thats because you are defining the middleware after the routes. You must first define this middleware. And the, call the routes to be defined.

Eg:

app.use(function (req, res, next) {
  req.sql = tediousExpress(req, 
    {
    "server"  : "something.database.windows.net",
    "userName": "something",
    "password": "something",
    "options": { "encrypt": true, "database": "something" }
    }
    );
  next();
});

app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use("/testAPI", testAPIRouter);