sql-lint

NOTE: This project is maintained but it's sporadic when it's worked on. I have my fingers in about 304583409 pies and they're not all software related. Please keep raising issues/bug reports

sql-lint will do sanity checks on your queries as well as bring errors back from the DB. If you worry about forgetting WHEREs on a DELETE or borking your data with unexpected characters, then sql-lint is for you.

A complete list of the checks it does is below.

Installation

npm i -g sql-lint
# or
yarn global add sql-lint

Or download a binary

Usage

sql-lint works on files, directories and stdin.

# Will lint all .sql files recursively from the current directory
sql-lint .

# Lints the create-person.sql file
sql-lint create-person.sql

# Lints stdin
echo 'DELETE FROM person;' | sql-lint

Programmatic Access

npm i sql-lint
# or
yarn add sql-lint

import sqlLint from 'sql-lint'

// using async/await

const errors = await sqlLint({
  sql: 'SELECT my_column FROM my_table',
})

// or using promise

sqlLint({ sql: 'SELECT my_column FROM my_table' }).then(errors => {
  for (const error of errors) {
    // do something
  }
})

Parameters

sql-lint accepts an object using the following interface as its only argument

{
  sql: string
  host?: string
  user?: string
  port?: number
  driver?: string
  prefix?: string
  password?: string
  verbosity?: number
}

Notes on some of the parameters

sql: can have multiple queries separated by ;

host: if host is not provided sql-lint will only perform checks that do not require a connection

driver: defaults to mysql

port: if port is not provided it will use the default port for the driver you are using

Output

sql-lint returns an array of objects with the following shape

{
  line: number
  error: string
  source: string
  additionalInformation: string
}

Editor Integration

If your editor supports external tools, then it supports sql-lint. Below is the list that have direct support for sql-lint either through plugins or configuration.

(Neo)Vim

(Neo)Vim can be configured to use sql-lint on .sql files.

Ale ships with sql-lint support out the box.

If you do not want to use a plugin, a much more lightweight solution is to run the following in an .sql file:

:!sql-lint %

VSCode

Inline SQL extension uses sql-lint to provide diagnostics for sql strings and optionally .sql files.

Checks

sql-lint comes with its own suite of checks. It also returns any errors from the SQL server you have connected to. Generally you'll find that the errors from sql-lint are more informative than those from the server. That said, you will still want errors from the server as it covers more cases and will catch things that sql-lint does not.

unmatched-parentheses

Shown when a query has an unbalanced amount of parentheses.

test/test-files//test.sql:16 [sql-lint: unmatched-parentheses] Unmatched parentheses.

missing-where

Shown when a DELETE statement is missing a WHERE clause.

test/test-files/test.sql:20 [sql-lint: missing-where] DELETE statement missing WHERE clause.

invalid-drop-option

Shown when an invalid option is given to the DROP statement.

test/test-files/test.sql:22 [sql-lint: invalid-drop-option] Option 'thing' is not a valid option, must be one of '["database","event","function","index","logfile","procedure","schema","server","table","view","tablespace","trigger"]'.

invalid-create-option

Shown when an invalid option is given to the CREATE statement.

:24 [sql-lint: invalid-create-option] Option 'test' is not a valid option, must be one of '["algorithm","database","definer","event","function","index","or","procedure","server","table","tablespace","temporary","trigger","user","unique","view"]'.

invalid-truncate-option

Shown when an invalid option is given to the TRUNCATE statement.

test/test-files/test.sql:26 [sql-lint: invalid-truncate-option] Option 'something' is not a valid option, must be one of '["table"]'.

invalid-alter-option

Shown when an invalid option is given to the ALTER statement.

test/test-files/test.sql:28 [sql-lint: invalid-alter-option] Option 'mlady' is not a valid option, must be one of '["column","online","offline","ignore","database","event","function","procedure","server","table","tablespace","view"]'.

odd-code-point

Shown when there are unsupported/unusual* code points in your code.

*This check came about whilst working Microsoft Excel. Microsoft likes to add a lot of zany characters which can subtly break your data without you realising.

test/test-files//test.sql:30 [sql-lint: odd-code-point] Unexpected code point.

invalid-limit-quantifier

Shown when you specify something other than a number to the LIMIT statement.

test/test-files//test.sql:32 [sql-lint: invalid-limit-quantifier] Argument 'test' is not a valid quantifier for LIMIT clause.

hungarian-notation

Shown when the string sp_ or tbl_ is present in the query.

test/test-files/test.sql:34 [sql-lint: hungarian-notation] Hungarian notation present in query

trailing-whitespace

Shown when a query has trailing whitespace.

test/test-files/test.sql:34 [sql-lint: trailing-whitespace] Trailing whitespace

Read more

To find out more, read the documentation