Sequelize Get Where

Sequelize is an ORM (Object Relational Mapper) for Node.js that allows you to interact with databases using an ORM layer, which removes the need to write SQL code and provides a more intuitive and streamlined approach to database operations. This document will provide an introduction to the Sequelize method get where.

What is the Sequelize get where method?

The Sequelize get where method allows you to retrieve rows from a table based on a specific condition or set of conditions. This method is similar to the Sequelize find method, but with a few key differences.

The get where method takes two parameters: the first is an object that provides the conditions for the query, and the second is an options object that allows you to specify additional parameters such as the columns to retrieve, the order in which to retrieve them, and whether or not to include associated models.

Here's an example of how you can use the Sequelize get where method to retrieve all rows from a table where a specific condition is met:

const users = await UserModel.get({ where: { age: { [Op.gt]: 18 } } });

In this example, the code retrieves all the rows from the UserModel table where the age is greater than 18. The [Op.gt] operator specifies the "greater than" condition.

Additional Parameters

In addition to the where parameter, you can also specify additional parameters to customize your query. Here are some examples:

Columns To Retrieve

If you only want to retrieve certain columns from the rows that match your query, you can specify them in the "attributes" property of the options object:

const users = await UserModel.get({
  where: { age: { [Op.gt]: 18 } },
  attributes: ['id', 'name']
});

In this example, the code will only retrieve the id and name columns from the matching rows.

Order

You can specify the order in which to retrieve the rows using the "order" property of the options object:

const users = await UserModel.get({
  where: { age: { [Op.gt]: 18 } },
  order: [['name', 'ASC']]
});

In this example, the code retrieves the matching rows ordered by the name column in ascending order.

Include Associated Models

If your table is associated with other tables, you can include those associated models in the query results by specifying them in the "include" property of the options object:

const users = await UserModel.get({
  where: { age: { [Op.gt]: 18 } },
  include: [RoleModel]
});

In this example, the code retrieves the matching rows along with their associated RoleModel records.

Conclusion

The Sequelize get where method is a powerful tool that allows you to retrieve specific rows from a table using customizable conditions and additional parameters. By using this method, you can streamline your database operations and make your code more efficient and scalable.