Simple Orm library for Deno based on deno_mysql

Deno Simple Orm

dso is a simple ORM Library based on deno_mysql

Example

import {
  BaseModel,
  Defaults,
  dso,
  Field,
  FieldType,
  CharsetType,
  Index,
  IndexType,
  Join,
  Model,
  Where
} from "https://deno.land/x/dso@v1.0.0/mod.ts";

// Define a database model
@Model("users")
class UserModel extends BaseModel {
  // Character set for whole table. UTF-8 is default and is not necessary to define.
  charset: CharsetType.utf8;

  // The ! operator is needed for primary key since it's never null 
  @Field({
    type: FieldType.INT,
    primary: true,
    length: 11,
    autoIncrement: true
  })
  id: number;

  @Field({ type: FieldType.STRING, length: 30 })
  name: string;

  @Field({ type: FieldType.STRING, length: 30 })
  password: string;

  // Charset can be explicitly defined for each column.
  @Field({ type: FieldType.STRING, length: 60, charset: CharsetType.utf8mb4 })
  namespace: string;

  // Index can be created [index/unique/spatial/fulltext] for each field
  @Field({ type: FieldType.STRING, length: 30, unique: true })
  email: string;

  // Multi column index can be defined by decorated @Index
  @Index({ type: IndexType.UNIQUE, columns: ["username","namespace"] })
  public myUniqueIndex!: Index;
}

const userModel = dso.define(UserModel);

async function main() {
  // The database must be created before linking
  await dso.connect({
    hostname: "127.0.0.1",
    port: 3306,
    username: "root",
    password: "",
    db: "dbname"
  });

  /*  
    When installing or initializing a database,
    you can use dso.sync to synchronize the database model to the database.
    Use false as the parameter if you want to sync only newly added models,
    Use true as the parameter if you want to sync the whole defined models
    to the database tables.

    == WARNING! ==
    Using true as the parameter will reset your whole database! Use with caution.
  */
  await dso.sync(false);

  // You can add records using insert method
  const insertId = await userModel.insert({
    name: "user1",
    password: "password"
  });

  // You can use the Model.findById method to get a record
  const user = await userModel.findById(1);

  // You can use Where clause too to get a record. For more information on
  // clauses such as join, order, etc. please consult:
  // https://github.com/manyuanrong/sql-builder

  // findOne + Where
  const userWhere = await userModel.findOne(Where.from({ name: "user1" }));

  // findAll + Where
  const userAll = await userModel.findAll(Where.from({ name: "user1" }));

  // findAll + expr like
  const userLike = await userModel.findAll(Where.expr("name like 'user%'"));

  console.log("Found user by id:", user);
  console.log("Found user by where eq clause:", userWhere);
  console.log("All users by where eq clause:", userAll);
  console.log("All users by where like clause:", userLike);
  console.log("User has these columns in index:", user.myUniqueIndex.columns);
}
main();

Running

Since this library needs to use Typescript Decorators and other features, a custom tsconfig.json needs to be added. Example config file can be found here, or just copy the contents below and create a new tsconfig.json file in your root directory.

tsconfig.json

{
  "compilerOptions": {
    "allowJs": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "module": "esnext",
    "isolatedModules": false
  }
}

To run, use:

deno run --allow-net -c tsconfig.json main.ts

where main.ts is your Typescript file for Deno.

Top Level API

dso.showQueryLog

Set whether query debugging information is displayed

dso.showQueryLog = true;

dso.connect

You need to use this method to link to the database before you can manipulate the database

await dso.connect({
  hostname: "127.0.0.1", // database hostname
  port: 3306, // database port
  username: "root", // database username
  password: "", // database password
  db: "dbname" // database name. (tips: The database must be created before linking)
});

dso.define()

Add an annotated Model instance and return the instance.

@Model("users")
class UserModel extends BaseModel {
  @Field({
    type: FieldType.INT,
    primary: true,
    length: 11,
    autoIncrement: true
  })
  id!: number;

  @Field({ type: FieldType.STRING, length: 30 })
  name?: string;

  @Field({ type: FieldType.STRING, length: 30 })
  password: string;

  @Field({ 
    type: FieldType.STRING, 
    unique: true, 
    length: 20})
  phoneNumber?: string;
}
}

export default const userModel = dso.define(UserModel);

// userModel.findById(...)
// userModel.findAll(...)
// userModel.findOne(...)
// userModel.insert(...)
// userModel.update(...)
// userModel.delete(...)

dso.sync

When installing or initializing a database, you can use sync to synchronize the database model to the database.

// If set to FORCE, tables will be deleted before they are created,
// otherwise only new models will be synchronized.
const force = true; // force
await dso.sync(force);

dso.transaction(processor: (transaction: Transaction) => Promise): Promise

Create and start a transaction.

New Model instances must be obtained through getModel(Model). Otherwise, it will not be controlled by transactions.

const result = await dso.transaction<boolean>(async trans => {
  const userModel = trans.getModel(UserModel);
  const topicModel = trans.getModel(TopicModel);

  userId = await userModel.insert({ nickName: "foo", password: "bar", phoneNumber: "08135539123" });
  topicId = await topicModel.insert({ title: "zoo", userId });
  return true;
});

Top Level Types

FieldType

• DATE
• INT
• TEXT
• STRING
• BOOLEAN

Field

Field type describes the following properties of a field

key	type	default value	desc
type	one of the FieldTypes	null	types of database fields
length	number	unfixed	field length
primary	boolean	false	database primary key?
default	any	null	default values for fields
autoIncrement	boolean	false	identify auto-increment fields. It can only be used for INT types
notNull	boolean	false	identity fields can not be null
autoUpdate	boolean	false	updated automatically according to the current timestamp. It can only be used for DATE types
unique	boolean	false	database unique index?
spatial	boolean	false	database spatial index?
fullText	boolean	false	database fullText index?
index	boolean	false	database non unique index?

Index

Following types of an index are available

key	multi column
index	true
unique	true
spatial	false
fulltext	true

Character sets

list of valid character sets is based on https://dev.mysql.com/doc/refman/8.0/en/charset-charsets.html

Download Details:

Author: manyuanrong

Source Code: https://github.com/manyuanrong/dso

#deno #node #nodejs #javascript