Public Key Retrieval is not allowed mysql怎么了

"Public Key Retrieval is not allowed" is a security feature in MySQL that prevents certain types of SQL injections. This error occurs when a user tries to retrieve a public key using the SQL command SELECT, but the server has disabled this feature to prevent unauthorized access to sensitive information. To resolve this issue, you can enable public key retrieval by modifying the MySQL configuration file or by granting the appropriate permissions to the user. However, it is recommended to use prepared statements and parameterized queries to avoid SQL injections instead of disabling this security feature.