Generate code from your SQL schema and queries for type safety and development speed.
Last updated 2 months ago by uladkasach .
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Generate code from your SQL schema and queries for type safety and development speed.

Generates type definitions and query functions with a single command!

oclif Version Codecov Downloads/week License

Table of Contents


The goal of sql-code-generator is to use the SQL you've already defined in order to speed up development and eliminate errors. This is done by extracting type definitions from sql and exposing those type definitions in code, automatically generating the interface that bridges your sql and your primary development language.

This includes:

  • generating type definitions from SQL resources (e.g., tables, views, functions, procedures)
  • generating type definitions from SQL queries (e.g., select * from table)
  • generating typed functions that execute SQL queries from SQL queries (e.g., const sqlQueryFindAllUsersByName = async ({ input: InputType }): Promise<OutputType>)

This enables:

  • controlling and mastering database logic fully in SQL
  • strictly bound types between sql and typescript for compile time error checking
  • strongly typed, auto-generated database query functions for speed, consistency, and encoding of best practices
  • autocompletion and explore-ability of sql resources in your IDE

Inspired by graphql-code-generator


1. Save the package as a dev dependency

npm install --save-dev sql-code-generator

2. Define a config yml

This file will define the sql language to extract type definitions from, where your sql resources and sql queries are, and where to output the generated types and query functions. By default, the generator looks for a file named codegen.sql.yml in your projects root.

For example:

language: mysql
dialect: 5.7
resources: # where to find your tables, functions, views, procedures
  - "schema/**/*.sql"
queries: # where to find your queries
  - "src/dao/**/*.ts"
  - "!src/**/*.test.ts"
  - "!src/**/*.test.integration.ts"
generates: # where to output the generated code
  types: src/dao/generated/types.ts
  queryFunctions: src/dao/generated/queryFunctions.ts

3. Test it out!

  $ npx sql-code-generator version
  $ npx sql-code-generator generate



Resources should be defined in .sql files. We'll extract both the name and the type from the create definition automatically. For example:

CREATE TABLE `image` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `uuid` char(36) COLLATE utf8mb4_bin NOT NULL,
  `created_at` datetime(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6),
  `url` varchar(190) COLLATE utf8mb4_bin NOT NULL,
  `caption` varchar(190) COLLATE utf8mb4_bin DEFAULT NULL,
  `credit` varchar(190) COLLATE utf8mb4_bin,
  `alt_text` varchar(190) COLLATE utf8mb4_bin,
  PRIMARY KEY (`id`),
  UNIQUE KEY `image_ux1` (`url`,`caption`,`credit`,`alt_text`)

The above definition would generate the following typescript type definitions:

// types for table 'image'
export interface SqlTableImage {
  id: number;
  uuid: string;
  created_at: Date;
  url: string;
  caption: string | null;
  credit: string | null;
  alt_text: string | null;


Queries can be defined in .ts or .sql files. If in a .ts file, this file should contain a named export called sql exporting the sql of your query. We'll extract the name of the query from a specially formatted comment in your sql, e.g.: -- query_name = find_images_by_url would resolve a query name of find_images_by_url. For example:

export const sql = `
-- query_name = find_images_by_url
FROM image i
WHERE i.url = :url

The above definition would generate the following typescript type definitions:

// types for query 'find_images_by_url'
export interface SqlQueryFindImagesByUrlInput {
  url: SqlTableImage['url'];
export interface SqlQueryFindImagesByUrlOutput {
  uuid: SqlTableImage['uuid'];
  url: SqlTableImage['url'];
  caption: SqlTableImage['caption'];
  credit: SqlTableImage['credit'];
  alt_text: SqlTableImage['alt_text'];

And that same definition would also generate the following typescript query function:

import { mysql as prepare } from 'yesql';
import { sql as sqlQueryFindImagesByUrlSql } from '../../dao/user/findAllByName';
import { SqlQueryFindImagesByUrlInput, SqlQueryFindImagesByUrlOutput } from './types';

// typedefs common to each query function
export type DatabaseExecuteCommand = (args: { sql: string; values: any[] }) => Promise<any[]>;
export type LogMethod = (message: string, metadata: any) => void;

// client method for query 'find_images_by_url'
export const sqlQueryFindImagesByUrl = async ({
}: {
  dbExecute: DatabaseExecuteCommand;
  logDebug: LogMethod;
  input: SqlQueryFindImagesByUrlInput;
}): Promise<SqlQueryFindImagesByUrlOutput[]> => {
  // 1. define the query with yesql
  const { sql: preparedSql, values: preparedValues } = prepare(sqlQueryFindImagesByUrlSql)(input);

  // 2. log that we're running the request
  logDebug('sqlQueryFindImagesByUrl.input', { input });

  // 3. execute the query
  const output = await dbExecute({ sql: preparedSql, values: preparedValues });

  // 4. log that we've executed the request
  logDebug('sqlQueryFindImagesByUrl.output', { output });

  // 5. return the output
  return output;


sql-code-generator generate

generate typescript code by parsing sql definitions for types and usage

  $ sql-code-generator generate

  -c, --config=config  (required) [default: codegen.sql.yml] path to config yml
  -h, --help           show CLI help

See code: dist/contract/commands/generate.ts

sql-code-generator help [COMMAND]

display help for sql-code-generator

  $ sql-code-generator help [COMMAND]

  COMMAND  command to show help for

  --all  see all commands in CLI

See code: @oclif/plugin-help


Team work makes the dream work! Please create a ticket for any features you think are missing and, if willing and able, draft a PR for the feature :)

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