MSSQL - TypeError: _this.driver.Connection is not a constructor

Either there’s something going on, or the error message isn’t helpful. 😃

My connection works with the base mssql, but not with Knex. Sample code to reproduce (run with babel-node):

import mssql from 'mssql';
import knex from 'knex';

require('dotenv').config();

const test = async () => {
  try {
    await mssql.connect(process.env.DATABASE_URL);
    const result = await mssql.query`select 1 as dbIsUp`;
    console.log(result.recordset);
    mssql.close();
  } catch (err) {
    console.log(err);
  }
};
test();

const db = knex({
  client: 'mssql',
  connection: process.env.DATABASE_URL,
  debug: true,
});

db.raw('select 1 as dbIsUp').then((values) => {
  // there is a valid connection in the pool
  console.log(values);
}).catch((err) => {
  console.log(err);
});

Expected Result: Connects without errors, OR error message that helps troubleshoot issue Actual Result:

  knex:pool INFO pool mssql:mssql:client0 - dispense() clients=1 available=0 +0ms
TypeError: _this.driver.Connection is not a constructor
    at /mnt/c/Users/Terry/Projects/gohealth/node_modules/knex/lib/dialects/mssql/index.js:135:24
    at Promise._execute (/mnt/c/Users/Terry/Projects/gohealth/node_modules/bluebird/js/release/debuggability.js:300:9)
    at Promise._resolveFromExecutor (/mnt/c/Users/Terry/Projects/gohealth/node_modules/bluebird/js/release/promise.js:483:18)
    at new Promise (/mnt/c/Users/Terry/Projects/gohealth/node_modules/bluebird/js/release/promise.js:79:10)
    at Client_MSSQL.acquireRawConnection (/mnt/c/Users/Terry/Projects/gohealth/node_modules/knex/lib/dialects/mssql/index.js:134:12)
    at Object.create (/mnt/c/Users/Terry/Projects/gohealth/node_modules/knex/lib/client.js:239:16)
    at Pool._createResource (/mnt/c/Users/Terry/Projects/gohealth/node_modules/generic-pool/lib/generic-pool.js:354:17)
    at Pool._ensureMinimum (/mnt/c/Users/Terry/Projects/gohealth/node_modules/generic-pool/lib/generic-pool.js:408:12)
    at new Pool (/mnt/c/Users/Terry/Projects/gohealth/node_modules/generic-pool/lib/generic-pool.js:157:8)
    at Client_MSSQL.initializePool (/mnt/c/Users/Terry/Projects/gohealth/node_modules/knex/lib/client.js:269:17)
    at Client_MSSQL.Client (/mnt/c/Users/Terry/Projects/gohealth/node_modules/knex/lib/client.js:116:12)
    at new Client_MSSQL (/mnt/c/Users/Terry/Projects/gohealth/node_modules/knex/lib/dialects/mssql/index.js:93:20)
    at Knex (/mnt/c/Users/Terry/Projects/gohealth/node_modules/knex/lib/index.js:60:34)
    at Object.<anonymous> (/mnt/c/Users/Terry/Projects/gohealth/scratch.js:18:12)
    at Module._compile (module.js:571:32)
    at loader (/mnt/c/Users/Terry/Projects/gohealth/node_modules/babel-register/lib/node.js:144:5)
  knex:pool INFO pool mssql:mssql:client0 - dispense() clients=0 available=0 +54ms
  knex:pool INFO pool mssql:mssql:client0 - dispense() clients=0 available=0 +1ms
  knex:pool INFO pool mssql:mssql:client0 - dispense() clients=0 available=0 +0ms
[ { dbIsUp: 1 } ]

[jordanhenderson]

Still getting this issue on 0.13.0. Unhandled rejection TypeError: _this.driver.Connection is not a constructor at node_modules/knex/lib/dialects/mssql/index.js:135:24 “dependencies”: { “knex”: “^0.13.0” },

It looks like this fix has not been included in a release yet.

[elhigu]

There are no schedules, but I’ll make the release before christmas. Maybe this month, maybe some other.