How to use React Query database plugin for data validation and formatting?

How to use the React Query database plugin for data validation and formatting?

Introduction:
In modern web development, data validation and formatting are very important links. React Query is a popular database plugin that provides powerful data management and state management capabilities. In this article, we'll explore how to use React Query for data validation and formatting to ensure data accuracy and consistency.

1. Data verification
Data verification refers to verifying the legality of input data. Legitimate data can ensure the normal operation of the system and prevent malicious attacks and the introduction of erroneous data. React Query provides a simple and flexible way to perform data validation using the query's validation function.

1. Create a validation function for the query
   First, we need to create a validation function to validate the input of the query. This function should receive input data as parameters and return a Boolean value indicating whether the input data is legal. The following is an example validation function:

const validateData = (data) => {
  if (!data) {
    return false;
  }
  // 在此处添加其他的验证逻辑...
  return true;
};

2. Using validation functions in queries
   Next, when creating the query, we can pass the validation function as a configuration option of the query enter. The query will call the validation function before making the request. If the validation function returns false, the query will be terminated and an error will be returned. The following is an example of using the validation function:

const fetchData = async (data) => {
  // 发起请求前先进行数据验证
  const isValid = validateData(data);
  if (!isValid) {
    throw new Error("Invalid data");
  }
  // 发起实际的请求...
};

const ExampleComponent = () => {
  const query = useQuery("data", fetchData);
  // 其他组件逻辑...
};

In the above example, if the validation function returns false, an error will be thrown, the query will be terminated, and the data will not be requested.

2. Data Formatting
Data formatting refers to converting input data into a specified format to meet the needs of front-end components. React Query also provides an easy way to format data using query conversion functions.

1. Create query conversion function
   We can create a conversion function to format the data returned by the query. This function receives the query's return data as a parameter and returns a converted formatted data. The following is an example conversion function:

const formatData = (data) => {
  // 在此处对返回的数据进行格式化...
  return formattedData;
};

2. Using conversion functions in queries
   When creating a query, the conversion function can be passed in as a configuration option of the query. The query will call the conversion function to format the data after the data is returned. The following is an example of using the conversion function:

const fetchData = async () => {
  // 发起实际的请求...
  const response = await api.fetchData();
  return response.data;
};

const ExampleComponent = () => {
  const query = useQuery("data", fetchData, {
    select: formatData,
  });
  // 其他组件逻辑...
};

In the above example, after the query obtains the data, the conversion function will be called to format the data.

Summary:
Using React Query for data validation and formatting is very simple and flexible. By using the query's validation and transformation functions, we can easily validate and format the data to ensure data accuracy and consistency. I hope this article was helpful when using React Query for data management.

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