GraphQL 面试题与答案
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问题 1. Explain the concept of persisted queries in GraphQL.
Persisted queries involve storing the query on the server and sending a reference (hash) instead of the full query in client requests. This can reduce the payload size and enhance security by preventing injection attacks.
问题 2. What is the purpose of the `alias` feature in GraphQL queries?
The `alias` feature in GraphQL allows clients to rename the result of a field in the response. It is useful when multiple fields in a query have the same name or when clients want to provide a different name for clarity.
问题 3. How does GraphQL handle errors in queries and mutations?
GraphQL responses include an 'errors' field that contains an array of error objects if any errors occur during the execution of the query or mutation. This allows clients to handle errors gracefully.
问题 4. Explain the concept of batching in GraphQL.
Batching in GraphQL involves combining multiple queries or mutations into a single request to the server. This helps in reducing the number of network requests and improving the overall efficiency of data fetching.
问题 5. What is GraphQL?
GraphQL is a query language for APIs and a runtime environment for executing those queries with existing data. It allows clients to request only the data they need and nothing more.
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