Building Secure RESTful APIs with NestJS: A Practical Guide/

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Implement the Read, Update, and Delete Operations

Implement the Read, Update, and Delete Operations

Explore how to perform the read, update, and delete operations for a MySQL database.

We'll cover the following...

CRUD operations

In the previous lesson, we implemented a create operation for the address table. In this lesson, we’ll complete the CRUD operations by implementing the read, update, and delete operations.

Read

First, we update the getById service method to use addressRepository to read data from the database.

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  // address.service.ts
  async getById(id: number) {
    return await this.addressRepository.findOne({
      where: {id,}
    });
  }

  • Line 2: This line uses the async keyword to indicate that the call to addressRepository is asynchronous. The await keyword is used to pause execution until the current task is complete and allows the program to continue with other tasks. Asynchronous tasks are suitable for operations that take some time to complete, including database queries, API calls, or file system operations. By using async/await, we allow the rest of the application to remain responsive while waiting for asynchronous tasks to complete.

  • Lines 3–5: These lines use ...