Tedious or Sequelize uses the wrong syntax for `findOne()`

Question

I am using Sequelize with Tedious to access SQL Server 2008.

When I do a sequelizeModel.findOne() I get this exception -

Unhandled

Answer 1

I have the same problem using sequelize v4.42.0 and SQL Server 2008 R2 (SP1). Inspecting the source code of SequelizeJS, I found in file lib/dialects/mssql/query-generator.js you have selectFromTableFragment function in line 821 of that version. In 826 line exists an if statement that verify the version number of SQL Server via the databaseVersion option, from the Sequelize options object.

// Handle SQL Server 2008 with TOP instead of LIMIT
if (semver.valid(this.sequelize.options.databaseVersion) && semver.lt(this.sequelize.options.databaseVersion, '11.0.0')) {

This option is not present in the docs from http://docs.sequelizejs.com, I searched for this option and did not found. In this option I setup my SQL Server version number ('10.50.2500' - Equivalent to 2008 R2 SP1) and this did works. The query now is created using SELECT TOP ... and not OFFSET AND FETCH NEXT.

I expect that helps other people that are having this issue like me.