Easily work with relational databases in Javascript and Typescript
Relational-schema is a utility package to generate a semantic, complete schema of a relational database (PostgreSQL, MySQL) in Javascript, JSON and other formats.
Works with MySQL and PostgreSQL. SQLite coming soon.
Full docs here
One of the key benefits of working with relational databases is the strict schema. Often in our applications we fail to take advantage of this, instead we rely on handwritten simplifications such as ORM models.
Relational-schema gives TS/JS developers a complete database schema including some nice additions (see below for specs).
The schema can be output in json, es6, typescript and commonJS to suit multiple use-cases.
This schema can be used for building better, more automated tooling for working with relational databases in JS.
Projects using Relational-schema
- Gybson - an auto generated, typesafe, flexible query client for working with relational databases in typescript.
npm install relational-schema
Create a config file relation-config.json
{
"host": "127.0.0.1",
"client": "mysql",
"port": 3306,
"user": "root",
"password": "secure",
"database": "mydb",
"outdir": "src/schemas",
"format": "json"
}relations introspect
The schema will be generated in outdir in the chosen format.
- columns (names, types, default values, nullability...)
- keys and constraints
- unique-ness
- Typescript type mappings
- table relations (including direction)
- human readable relation alias'
- soft-delete idenfication
- enums
{
"database": "tests",
"schema": "tests",
"generatedAt": "2021-04-21T08:41:31.747Z",
"tables": {
"teams": {
"primaryKey": {
"constraintName": "teams_pkey",
"constraintType": "PRIMARY KEY",
"columnNames": ["team_id"]
},
"keys": [{ "constraintName": "teams_pkey", "constraintType": "PRIMARY KEY", "columnNames": ["team_id"] }],
"uniqueKeyCombinations": [["team_id"]],
"relations": [
{
"toTable": "team_members",
"alias": "team_members",
"joins": [{ "fromColumn": "team_id", "toColumn": "team_id" }],
"type": "hasMany"
}
],
"columns": {
"team_id": {
"dbType": "int4",
"columnDefault": "nextval('teams_team_id_seq'::regclass)",
"nullable": false,
"columnName": "team_id",
"tsType": "number"
},
"name": {
"dbType": "varchar",
"columnDefault": null,
"nullable": false,
"columnName": "name",
"tsType": "string"
},
"deleted": {
"dbType": "bool",
"columnDefault": "false",
"nullable": true,
"columnName": "deleted",
"tsType": "boolean"
}
},
"softDelete": {
"dbType": "bool",
"columnDefault": "false",
"nullable": true,
"columnName": "deleted",
"tsType": "boolean"
},
"enums": {
"teams_subscription_level": {
"enumName": "teams_subscription_level",
"values": ["BRONZE", "GOLD", "SILVER"],
"columnName": ""
},
"teams_permissions": { "enumName": "teams_permissions", "values": ["ADMIN", "USER"], "columnName": "" }
}
},
"team_members": {
"primaryKey": {
"constraintName": "team_members_pkey",
"constraintType": "PRIMARY KEY",
"columnNames": ["team_id", "user_id"]
},
"keys": [
{
"constraintName": "team_members_member_post_id_foreign",
"constraintType": "FOREIGN KEY",
"columnNames": ["member_post_id"]
},
{
"constraintName": "team_members_pkey",
"constraintType": "PRIMARY KEY",
"columnNames": ["team_id", "user_id"]
},
{
"constraintName": "team_members_team_id_foreign",
"constraintType": "FOREIGN KEY",
"columnNames": ["team_id"]
},
{
"constraintName": "team_members_user_id_foreign",
"constraintType": "FOREIGN KEY",
"columnNames": ["user_id"]
}
],
"uniqueKeyCombinations": [["team_id", "user_id"]],
"relations": [
{
"toTable": "posts",
"alias": "member_post",
"joins": [{ "fromColumn": "member_post_id", "toColumn": "post_id" }],
"type": "belongsTo"
},
{
"toTable": "teams",
"alias": "team",
"joins": [{ "fromColumn": "team_id", "toColumn": "team_id" }],
"type": "belongsTo"
},
{
"toTable": "users",
"alias": "user",
"joins": [{ "fromColumn": "user_id", "toColumn": "user_id" }],
"type": "belongsTo"
},
{
"toTable": "team_members_positions",
"alias": "team_members_position",
"joins": [
{ "fromColumn": "team_id", "toColumn": "team_id" },
{ "fromColumn": "user_id", "toColumn": "user_id" }
],
"type": "hasOne"
}
],
"columns": {
"team_id": {
"dbType": "int4",
"columnDefault": null,
"nullable": false,
"columnName": "team_id",
"tsType": "number"
},
"user_id": {
"dbType": "int4",
"columnDefault": null,
"nullable": false,
"columnName": "user_id",
"tsType": "number"
},
"member_post_id": {
"dbType": "int4",
"columnDefault": null,
"nullable": true,
"columnName": "member_post_id",
"tsType": "number"
},
"deleted": {
"dbType": "bool",
"columnDefault": "false",
"nullable": true,
"columnName": "deleted",
"tsType": "boolean"
}
},
"softDelete": {
"dbType": "bool",
"columnDefault": "false",
"nullable": true,
"columnName": "deleted",
"tsType": "boolean"
},
"enums": {
"team_members_subscription_level": {
"enumName": "team_members_subscription_level",
"values": ["BRONZE", "GOLD", "SILVER"],
"columnName": ""
},
"team_members_permissions": {
"enumName": "team_members_permissions",
"values": ["ADMIN", "USER"],
"columnName": ""
}
}
},
"team_members_positions": {
"primaryKey": {
"constraintName": "team_members_positions_pkey",
"constraintType": "PRIMARY KEY",
"columnNames": ["team_id", "user_id"]
},
"keys": [
{
"constraintName": "team_members_positions_position_manager_unique",
"constraintType": "UNIQUE",
"columnNames": ["manager", "position"]
},
{
"constraintName": "team_members_positions_pkey",
"constraintType": "PRIMARY KEY",
"columnNames": ["team_id", "user_id"]
},
{
"constraintName": "team_members_positions_team_id_user_id_foreign",
"constraintType": "FOREIGN KEY",
"columnNames": ["team_id", "user_id"]
}
],
"uniqueKeyCombinations": [
["manager", "position"],
["team_id", "user_id"]
],
"relations": [
{
"toTable": "team_members",
"alias": "team_member",
"joins": [
{ "fromColumn": "team_id", "toColumn": "team_id" },
{ "fromColumn": "user_id", "toColumn": "user_id" }
],
"type": "hasOne"
}
],
"columns": {
"team_id": {
"dbType": "int4",
"columnDefault": null,
"nullable": false,
"columnName": "team_id",
"tsType": "number"
},
"user_id": {
"dbType": "int4",
"columnDefault": null,
"nullable": false,
"columnName": "user_id",
"tsType": "number"
},
"position": {
"dbType": "varchar",
"columnDefault": null,
"nullable": false,
"columnName": "position",
"tsType": "string"
},
"manager": {
"dbType": "varchar",
"columnDefault": null,
"nullable": false,
"columnName": "manager",
"tsType": "string"
},
"verified": {
"dbType": "bool",
"columnDefault": "false",
"nullable": true,
"columnName": "verified",
"tsType": "boolean"
}
},
"softDelete": null,
"enums": {
"team_members_positions_subscription_level": {
"enumName": "team_members_positions_subscription_level",
"values": ["BRONZE", "GOLD", "SILVER"],
"columnName": ""
},
"team_members_positions_permissions": {
"enumName": "team_members_positions_permissions",
"values": ["ADMIN", "USER"],
"columnName": ""
}
}
},
"users": {
"primaryKey": {
"constraintName": "users_pkey",
"constraintType": "PRIMARY KEY",
"columnNames": ["user_id"]
},
"keys": [
{
"constraintName": "users_best_friend_id_foreign",
"constraintType": "FOREIGN KEY",
"columnNames": ["best_friend_id"]
},
{ "constraintName": "users_email_unique", "constraintType": "UNIQUE", "columnNames": ["email"] },
{ "constraintName": "users_token_unique", "constraintType": "UNIQUE", "columnNames": ["token"] },
{ "constraintName": "users_pkey", "constraintType": "PRIMARY KEY", "columnNames": ["user_id"] }
],
"uniqueKeyCombinations": [["email"], ["token"], ["user_id"]],
"relations": [
{
"toTable": "users",
"alias": "best_friend",
"joins": [{ "fromColumn": "best_friend_id", "toColumn": "user_id" }],
"type": "belongsTo"
},
{
"toTable": "posts",
"alias": "author_posts",
"joins": [{ "fromColumn": "user_id", "toColumn": "author_id" }],
"type": "hasMany"
},
{
"toTable": "posts",
"alias": "co_author_posts",
"joins": [{ "fromColumn": "user_id", "toColumn": "co_author" }],
"type": "hasMany"
},
{
"toTable": "team_members",
"alias": "team_members",
"joins": [{ "fromColumn": "user_id", "toColumn": "user_id" }],
"type": "hasMany"
},
{
"toTable": "users",
"alias": "users",
"joins": [{ "fromColumn": "user_id", "toColumn": "best_friend_id" }],
"type": "hasMany"
}
],
"columns": {
"user_id": {
"dbType": "int4",
"columnDefault": "nextval('users_user_id_seq'::regclass)",
"nullable": false,
"columnName": "user_id",
"tsType": "number"
},
"best_friend_id": {
"dbType": "int4",
"columnDefault": null,
"nullable": true,
"columnName": "best_friend_id",
"tsType": "number"
},
"email": {
"dbType": "varchar",
"columnDefault": null,
"nullable": false,
"columnName": "email",
"tsType": "string"
},
"first_name": {
"dbType": "varchar",
"columnDefault": null,
"nullable": true,
"columnName": "first_name",
"tsType": "string"
},
"last_name": {
"dbType": "varchar",
"columnDefault": null,
"nullable": true,
"columnName": "last_name",
"tsType": "string"
},
"password": {
"dbType": "varchar",
"columnDefault": null,
"nullable": false,
"columnName": "password",
"tsType": "string"
},
"token": {
"dbType": "varchar",
"columnDefault": null,
"nullable": true,
"columnName": "token",
"tsType": "string"
},
"permissions": {
"dbType": "permissions",
"columnDefault": "'USER'::permissions",
"nullable": true,
"columnName": "permissions",
"tsType": "users_permissions"
},
"subscription_level": {
"dbType": "subscription_level",
"columnDefault": null,
"nullable": true,
"columnName": "subscription_level",
"tsType": "users_subscription_level"
},
"deleted_at": {
"dbType": "timestamptz",
"columnDefault": null,
"nullable": true,
"columnName": "deleted_at",
"tsType": "Date"
}
},
"softDelete": {
"dbType": "timestamptz",
"columnDefault": null,
"nullable": true,
"columnName": "deleted_at",
"tsType": "Date"
},
"enums": {
"users_subscription_level": {
"enumName": "users_subscription_level",
"values": ["BRONZE", "GOLD", "SILVER"],
"columnName": ""
},
"users_permissions": { "enumName": "users_permissions", "values": ["ADMIN", "USER"], "columnName": "" }
}
},
"posts": {
"primaryKey": {
"constraintName": "posts_pkey",
"constraintType": "PRIMARY KEY",
"columnNames": ["post_id"]
},
"keys": [
{
"constraintName": "posts_author_id_foreign",
"constraintType": "FOREIGN KEY",
"columnNames": ["author_id"]
},
{
"constraintName": "posts_co_author_foreign",
"constraintType": "FOREIGN KEY",
"columnNames": ["co_author"]
},
{ "constraintName": "posts_pkey", "constraintType": "PRIMARY KEY", "columnNames": ["post_id"] }
],
"uniqueKeyCombinations": [["post_id"]],
"relations": [
{
"toTable": "users",
"alias": "author_",
"joins": [{ "fromColumn": "author_id", "toColumn": "user_id" }],
"type": "belongsTo"
},
{
"toTable": "users",
"alias": "co_author_",
"joins": [{ "fromColumn": "co_author", "toColumn": "user_id" }],
"type": "belongsTo"
},
{
"toTable": "team_members",
"alias": "team_members",
"joins": [{ "fromColumn": "post_id", "toColumn": "member_post_id" }],
"type": "hasMany"
}
],
"columns": {
"post_id": {
"dbType": "int4",
"columnDefault": "nextval('posts_post_id_seq'::regclass)",
"nullable": false,
"columnName": "post_id",
"tsType": "number"
},
"author": {
"dbType": "varchar",
"columnDefault": null,
"nullable": false,
"columnName": "author",
"tsType": "string"
},
"author_id": {
"dbType": "int4",
"columnDefault": null,
"nullable": false,
"columnName": "author_id",
"tsType": "number"
},
"co_author": {
"dbType": "int4",
"columnDefault": null,
"nullable": true,
"columnName": "co_author",
"tsType": "number"
},
"message": {
"dbType": "varchar",
"columnDefault": null,
"nullable": false,
"columnName": "message",
"tsType": "string"
},
"rating_average": {
"dbType": "float4",
"columnDefault": "'0'::real",
"nullable": true,
"columnName": "rating_average",
"tsType": "number"
},
"created": {
"dbType": "timestamptz",
"columnDefault": "CURRENT_TIMESTAMP",
"nullable": true,
"columnName": "created",
"tsType": "Date"
},
"deleted": {
"dbType": "bool",
"columnDefault": "false",
"nullable": true,
"columnName": "deleted",
"tsType": "boolean"
}
},
"softDelete": {
"dbType": "bool",
"columnDefault": "false",
"nullable": true,
"columnName": "deleted",
"tsType": "boolean"
},
"enums": {
"posts_subscription_level": {
"enumName": "posts_subscription_level",
"values": ["BRONZE", "GOLD", "SILVER"],
"columnName": ""
},
"posts_permissions": { "enumName": "posts_permissions", "values": ["ADMIN", "USER"], "columnName": "" }
}
}
}
}Relational-schema is built on top of trusted open-source projects: