typeorm caching queries time limit

What is TypeORM Caching Queries Time Limit?#

TypeORM is an object-relational mapping (ORM) library that allows you to work with databases using object-oriented programming. One of the features of TypeORM is query caching, which can improve the performance of your application by reducing the number of times you need to query the database. When you enable caching, TypeORM will store the result of a query in cache memory and return it instead of querying the database again.

The caching mechanism has a time limit, which determines how long the result of a query will be stored in cache memory. If you request the same data after the time limit has expired, TypeORM will query the database again and store the new result in cache memory.

How to Set TypeORM Caching Queries Time Limit?#

You can set the time limit for TypeORM caching queries by using the cache option in the query builder or repository methods. For example:

const userRepository = getRepository(User);
const users = await userRepository
  .createQueryBuilder('user')
  .where({ firstName: 'John' })
  .cache(60000) // set cache time limit to 60 seconds
  .getMany();
  

In this example, we set the cache time limit to 60 seconds (1 minute) using the cache method. If we request the same data within 60 seconds, TypeORM will return the cached result instead of querying the database again.

You can also set a default time limit for all cached queries by using the cacheTimeMs option in the TypeORM configuration. For example:

const connection = await createConnection({
  type: 'mysql',
  host: 'localhost',
  port: 3306,
  username: 'root',
  password: 'password',
  database: 'mydatabase',
  cache: {
    type: 'redis',
    options: {
      host: 'localhost',
      port: 6379,
    },
    cacheTimeMs: 60000, // set default cache time limit to 60 seconds
  },
});
  

In this example, we set the default cache time limit to 60 seconds using the cacheTimeMs option in the TypeORM configuration. This means that all cached queries will have a time limit of 60 seconds unless explicitly set otherwise using the cache method.

Conclusion#

TypeORM caching queries time limit is an important feature that can help improve the performance of your application. By setting an appropriate time limit, you can balance the benefits of caching with the need for up-to-date data. You can set the time limit for individual queries using the cache method, or set a default time limit for all queries using the cacheTimeMs option in the TypeORM configuration.