MySQL CREATE USER mit einer Variablen?

Question

Ich möchte, dies zu tun:

#Variables 
SET @username="jdoe", @password="secret"; 

# Insert a new MySQL User 
CREATE USER @username@'localhost' IDENTIFIED BY @password;GRANT USAGE ON *.* TO @username@'localhost' IDENTIFIED BY @password WITH MAX_QUERIES_PER_HOUR 120 MAX_CONNECTIONS_PER_HOUR 60 MAX_UPDATES_PER_HOUR 60 MAX_USER_CONNECTIONS 2; 

aber erhalten:

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '@username@'localhost' IDENTIFIED BY @password' at line 2 

Wie verwende ich eine Variable in der CREATE USER-Anweisung?

Answer 1

können Sie verwenden dynamic SQL als:

SET @query1 = CONCAT(' 
     CREATE USER "',@username,'"@"localhost" IDENTIFIED BY "',@password,'" ' 
     ); 
PREPARE stmt FROM @query1; EXECUTE stmt; DEALLOCATE PREPARE stmt; 

SET @query1 = CONCAT(' 
    GRANT USAGE ON *.* TO "',@username,'"@"localhost" IDENTIFIED BY "',@password,'" WITH 
      MAX_QUERIES_PER_HOUR 120 MAX_CONNECTIONS_PER_HOUR 60 MAX_UPDATES_PER_HOUR 60 
      MAX_USER_CONNECTIONS 2' 
     ); 
PREPARE stmt FROM @query1; EXECUTE stmt; DEALLOCATE PREPARE stmt;