What is queries object in react query?

 

The queries object is a configuration object that can be used to control how queries are executed and cached. It has the following properties:

staleTime: The amount of time in milliseconds after data is considered stale. If the data is stale, the query will be refetched.

cacheTime: The amount of time in milliseconds that data is kept in the cache. If the data is older than the cache time, it will be removed from the cache.

refetchInterval: The amount of time in milliseconds between refetches. If the refetch interval is set, the query will be refetched automatically at that interval, regardless of whether the data is stale.

retry: The number of times the query will be retried if it fails.

staleTime

The staleTime property is useful for controlling how often queries are refetched. If you have a query that returns data that changes frequently, you may want to set a low staleTime value so that the data is always fresh. For example, if you have a query that returns the latest news headlines, you may want to set a staleTime value of 1 minute so that the data is never more than 1 minute old.

If you have a query that returns data that changes less frequently, you can set a higher staleTime value to save on bandwidth and improve performance. For example, if you have a query that returns the list of all products in your store, you may want to set a staleTime value of 1 hour so that the data is only refetched if it has changed in the last hour.

cacheTime

The cacheTime property is useful for controlling how long data is kept in the cache. If you have a query that returns data that is used frequently, you may want to set a high cacheTime value so that the data is always available in the cache. For example, if you have a query that returns the user's profile data, you may want to set a cacheTime value of 1 hour so that the data is never more than 1 hour old.

If you have a query that returns data that is not used frequently, you can set a lower cacheTime value to save on memory. For example, if you have a query that returns the list of all products in your store, you may want to set a cacheTime value of 10 minutes so that the data is only kept in the cache for 10 minutes before it is removed.

refetchInterval

The refetchInterval property is useful for automatically refetching queries at regular intervals. This can be useful for queries that return data that changes frequently, such as news feeds or social media feeds. For example, you may want to set a refetchInterval value of 5 minutes for a query that returns the latest news headlines so that the data is always fresh.

retry

The retry property is useful for preventing errors from causing your application to crash. If you have a query that is likely to fail occasionally, such as a query that accesses a remote database, you can set a retry value so that the query will be retried if it fails. For example, you may want to set a retry value of 3 for a query that accesses a remote database so that the query will be retried 3 times if it fails.

How to choose the right values for the queries options

The best values for the queries options will depend on the specific needs of your application. For example, if you have a query that returns data that is used frequently and changes frequently, you may want to set a low staleTime value, a high cacheTime value, and a short refetchInterval value. If you have a query that returns data that is not used frequently and changes infrequently, you may want to set a high staleTime value, a low cacheTime value, and no refetchInterval value.

Summary

The queries object provides a number of options for controlling how queries are executed and cached. By carefully choosing the values for these options, you can improve the performance, reliability, and efficiency of your application.

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