node.js crud HY010 error

index.js

const db = require('/QOpenSys/QIBM/ProdData/OPS/Node6/os400/db2i/lib/db2a')
const body_parser = require('body-parser')
const express = require('express')
const app = express()

const dbconn = new db.dbconn()
dbconn.conn("*LOCAL")
const stmt = new db.dbstmt(dbconn)
 
const schema = 'NODELIB'
 

app.set('views', __dirname + '/views')
app.set('view engine', 'pug')

app.use(body_parser.urlencoded({ extended: true }))

app.get('/', function(req, res) {
 res.render('index', { title: 'Hey', message: 'Hey Jade!'})
})

app.get('/customers', function(req, res)
{
    let stmt = db.dbstmt(dbconn)
	stmt.exec(`Select LSTNAM, CUSNUM from ${schema}.CUSTOMER`, function(results, err)
	{
	  res.render('customers/index', { title: 'Customers', results: results})
	  stmt.close()
	})
})

app.get('/customers/new', function(req, res) {
 console.log('i got to /customers/new:'  ) 
 res.render('customers/new', {result: {}, form_action: '/customers/create'})
 })
 
app.post('/customers/create', function(req, res) {
  let stmt = new db.dbstmt(dbconn)
  console.log('now im going to insert data:'  ) 
  var sql = 
      `INSERT INTO ${schema}.CUSTOMER (CUSNUM,LSTNAM,INIT,STREET) VALUES (${req.body.CUSNUM}, '${req.body.LSTNAM}', '${req.body.INIT}', '${req.body.STREET}')`
  stmt.exec(sql, function(result, err){
    res.redirect('/customers')
  stmt.close()
    })
   })

app.get('/customers/:id', function(req, res) {
  let stmt = new db.dbstmt(dbconn)
  var sql = `SELECT * FROM ${schema}.CUSTOMER WHERE CUSNUM=${req.params.id}`
  stmt.exec(sql, function(result, err) {
    res.render('customers/show', { title: 'Customer', result: result[0]})
  stmt.close()
  })
})

app.get('/customers/:id/edit', function(req,res){
  var sql = `SELECT * FROM ${schema}.CUSTOMER WHERE CUSNUM=${req.params.id}`
  stmt.exec(sql, function(result, err) {
    res.render('customers/edit', 
    { title: 'Customer', 
      result: result[0],
      form_action: `/customers/${req.params.id}/update`
      }
      )
      })
      })
      
app.post('/customers/:id/update', function(req, res) {
console.log('I made it to the update function')
  var sql = 
    `UPDATE ${schema}.CUSTOMER SET CUSNUM=${req.body.CUSNUM},LSTNAM='${req.body.LSTNAM}',INIT='${req.body.INIT}',STREET='${req.body.STREET}' WHERE CUSNUM=${req.body.CUSNUM}`
  stmt.exec(sql, function(result, err){
  console.log(err)
    res.redirect('/customers')
  })
})

app.get('/customers/:id/delete', function(req, res) {
  var sql = `DELETE FROM ${schema}.CUSTOMER WHERE CUSNUM=${req.params.id}`
  stmt.exec(sql, function(results, err){
    res.redirect('/customers')  
  })
})      
var port = process.env.PORT || 8018
app.listen(port, function() 
{
	console.log('Running on port %d', port)