how to grant MySQL privileges only to a specific row

问题

Imagine there is a student table
student(id,name,city)
I want to create a user A and grant permission only to update record where id=10.

CREATE USER A ;
GRANT UPDATE ON student TO A WHERE student.id=10;

I tried this and it does not work.

回答1:

No not a single row but a view that contains a single row which will, in turn, will update the actual real table.

This can be done via specific table view per student (yes it will be a messy DB structure). Grant access to the view for this user only alow select/updates only and the primary key will be non-updateable. The main table will update itself when the view is updated.

CREATE SCHEMA `example` ;

CREATE TABLE `example`.`student` (
      `id` INT NOT NULL,
      `name` VARCHAR(45) NULL,
      `email` VARCHAR(45) NULL,
      PRIMARY KEY (`id`));

INSERT INTO `example`.`student` (`id`, `name`, `email`) VALUES ('1', 'bob', 'bob@bob.com');


USE `example`;
CREATE 
     OR REPLACE SQL SECURITY DEFINER
VIEW `student_1` AS
    SELECT 
        `student`.`id` AS `id`,
        `student`.`name` AS `name`,
        `student`.`email` AS `email`
    FROM
        `student`
    WHERE
        (`student`.`id` = '1');

CREATE USER 'student_1_user'@'localhost' IDENTIFIED BY 'user_password';

    GRANT SELECT,UPDATE ON example.student_1 TO student_1_user@localhost IDENTIFIED BY 'user_password';

UPDATE example.student_1 SET email='newemail@bob.com'; // note no primary key needed or allowed

来源：https://stackoverflow.com/questions/60025159/how-to-grant-mysql-privileges-only-to-a-specific-row

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