How to use the DataTypes function from sequelize

sequelize.DataTypes is an object that contains all the built-in data types that can be used in a Sequelize model definition.

How does sequelize.DataTypes work?

sequelize.DataTypes is an object that contains all the built-in data types that can be used in a Sequelize model definition. These data types are used to define the schema of a database table and to create columns with specific data types.

The sequelize.DataTypes object provides a simple way to define data types for Sequelize models. It includes data types such as STRING, INTEGER, FLOAT, BOOLEAN, DATE, JSON, ENUM, ARRAY, and more. When defining a Sequelize model, you can specify the data type of each column by accessing the relevant data type from the sequelize.DataTypes object.

For example, to define a column named name with a STRING data type, you would use:

javascriptCopy code
const { DataTypes } = require('sequelize');

const User = sequelize.define('User', {
  name: {
    type: DataTypes.STRING
  }
});

In this example, we're requiring the DataTypes object from the sequelize package, and using it to define the name column with a STRING data type. Sequelize will then use this information to create a VARCHAR column in the database.

In addition to the built-in data types provided by sequelize.DataTypes, you can also define custom data types by extending existing data types or by creating entirely new ones using the sequelize.define method.

Overall, sequelize.DataTypes is a convenient and powerful way to define the schema of a database table with Sequelize.

Ai Example

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const { Sequelize, DataTypes } = require("sequelize");

const sequelize = new Sequelize("database", "username", "password", {
  dialect: "sqlite",
  storage: "./database.sqlite",
});

const User = sequelize.define("User", {
  name: {
    type: DataTypes.STRING,
    allowNull: false,
  },
  email: {
    type: DataTypes.STRING,
    allowNull: false,
    unique: true,
  },
  age: {
    type: DataTypes.INTEGER,
    allowNull: true,
  },
  is_admin: {
    type: DataTypes.BOOLEAN,
    allowNull: false,
    defaultValue: false,
  },
});

(async () => {
  await sequelize.sync({ force: true });
  console.log("User model synced successfully");
})();

In this example, we're requiring Sequelize and DataTypes from the sequelize package. We're then creating a new sequelize instance, and using it to define a User model with four columns: name, email, age, and is_admin. For each column, we're specifying the data type by accessing it from the DataTypes object provided by Sequelize. We're also setting various options such as allowNull, unique, and defaultValue to define the column constraints. Finally, we're using the sequelize.sync method to synchronize the model with the database, and logging a success message when the sync is complete. By using sequelize.DataTypes, we've defined the schema of a database table with Sequelize. We've used the various data types provided by sequelize.DataTypes to specify the data type of each column, and set various constraints to ensure the integrity of the data. We've also used the sequelize.sync method to create the table in the database.