Knex Cheatsheet

Posted : admin On 1/29/2022
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Is it possible to do multiple orderBy() columns?

The orderBy() chainable only takes a single column key and a sort value, but how can I order by multiple columns?

You can call .orderBy multiple times to order by multiple columns:

multiple columns in .orderBy() · Issue #2874 · knex/knex · GitHub, orderBy() when setting order with multiple columns. For now, I should write code like .select() .from('table') .orderBy('a') .orderBy('b', The same goes for orderBy(['a','b','c'], ['asc', 'desc', 'desc'])—it is not clear which of the two arrays is the column names and which is the direction (although, arguably, the same could be said for the regular orderBy(column, direction) syntax as well, so …

The original answer is technically correct, and useful, but my intention was to find a way to programatically apply the orderBy() function multiple times, here is the actual solution I went with for reference:

Knex offers a modify function which allows the queryBuilder to be operated on directly. An array iterator then calls orderBy() multiple times.

support multiple columns in `.orderBy()` · Issue #2881 · knex/knex , types/knex.d.ts. src/query/builder.js Adds a `order by` with multiple columns to the query. -2472,6 +2472,60 @@ describe('QueryBuilder', function() {. );. });. Knex.js is a 'batteries included' SQL query builder for Postgres, MSSQL, MySQL, MariaDB, SQLite3, Oracle, and Amazon Redshift designed to be flexible, portable, and fun to use. It features both traditional node style callbacks as well as a promise interface for cleaner async flow control, a stream interface, full featured query and schema

You can use the following solution to solve your problem:

Knex.js multiple orderBy() columns, Is it possible to do multiple orderBy() columns? knex .select() .table('products') .​orderBy('id', 'asc'). The orderBy() chainable only takes a single LINQ includes five sorting operators: OrderBy, OrderByDescending, ThenBy, ThenByDescending and Reverse. LINQ query syntax does not support OrderByDescending, ThenBy, ThenByDescending and Reverse. It only supports 'Order By' clause with 'ascending' and 'descending' sorting direction. LINQ query syntax supports multiple sorting fields seperated

Knex

Knex.js, Knex.js is a 'batteries included' SQL query builder for Postgres, MSSQL, MySQL var knex = require('knex')({ client: 'postgres', connection: async () => { const for sqlite3 (due to issues with utilizing multiple connections on a single file). example snake_case -> camelCase conversion for returned columns with this hook. DZone > Java Zone > How to order by multiple columns using Lambas and LINQ in C# Dec. 24, 11 · Java Zone · News. Join the DZone community and get the full member experience. Today, I was

[knex] orderBy multiple field sorting in knex.js, [knex] orderBy multiple field sorting in knex.js, Programmer Sought, the best column: 'age', order: 'desc' } ]) //Equivalent to: select * from `users` order by Is it possible to use multiple fields in the order by odata filter on a SharePoint get items action? i.e. if I want to sort by Title Field, then Date Field as an example: Title asc and Date asc What is the correct way to structure that - it appears to be differen than the filter query sytax.

Knex cheatsheet, One-page guide to Knex: usage, examples, and more. Knex is an SQL query builder for Node.js.This guide targets v0.13.0. In order to sort the dataframe in pyspark we will be using orderBy() function. orderBy() Function in pyspark sorts the dataframe in by single column and multiple column. It also sorts the dataframe in pyspark by descending order or ascending order.

Knex Cheatsheet
Comments
  • I'm not sure there's a special function for that, but you can do a orderByRaw and write whatever you need
  • @VsevolodGoloviznin I was hoping I wouldn't have to do that, but it's my last resort.
  • Thanks, but is there any way to apply that programatically? for an unknown number of orderBy fields?
  • Just iterate over the list of columns and call orderBy for each. I'll save the basic JS as an exercise for you :)
  • I think the original answer was working as you intended too. For instance: let query = knex .select() .table('products'); _.each(sortArray, function(sort) { query.orderBy(sort.field, sort.direction); });

Hot Questions

Project Structure⌗

Cheatsheet

Here’s the project structure for my application. Adjust to your needs.I used the Express application generator to scaffold the program.

Dockerfile & docker-compose⌗

The Dockerfile must have the Postgres connection string as a build argument.

See Docker ARG, ENV and .env - a Complete Guide for more information on ARG, ENV and Docker.

Example excerpt from Dockerfile:

Knex

Example docker-compose.yml:

Install Knex.js & Postgres⌗

We also use docker-compose.yaml to create a container for the Postgres database. Let’s call the service db:

The database folder is located inside the node application: node_app/db.
Here’s the Dockerfile for the Postgres database:

create.sql spins up the databases for development, testing, production:

The Postgres connection string inside the docker-compose.yaml reflects this:

Knex Cheatsheet

Your Node application must have Knex.js and the postgres driver.

For example:

Knex Cheat Sheet

Initialization⌗

Initialize knex:

Now we can adjust the configuration to our needs:

Migrations⌗

up and down functions:You’ll find a new file inside the migrations folder.

Run migrations:

Seeds⌗

For example:

This will create new folders called seeds/development and seeds/test which you can modify.

In my repository, the files are node_app/seeds/development/show-seed.js and node_app/seeds/tet/show-seed.js

Then run docker-compose exec node_app seed:run --env development (and --env test).

Glue Everything Together⌗

Knex Mysql

Create knex.js inside the database folder (node_app/db/knex.js):

Example GitHub Repository⌗

Cannot Find Module Knex

See GitHub.

Knex Query Builder

Further Reading⌗