MySQL-Ignoring query to other database solution

Linux command line successfully logs in to mysql and executes the command to report Ignoring query to other database.

[mysql@bjdev01 ~]$ mysql -Uroot -p
Enter password: 
mysql> select now();

Ignoring query to other database

mysql> exit
Bye

Log out and log in again, normal.

[mysql@bjdev01 ~]$ mysql -uroot -pEnter password:
mysql> select now();
+---------------------+
| 
now()               |
+---------------------+
| 2014-01-27 10:29:47 |
+---------------------+
1 row in set (0.00 sec)

Compare the two login commands:
First login: mysql -Uroot -p
Second login: mysql -uroot -p

It was found that one of the parameters used is an uppercase U and the other is a lowercase u, and the two parameters are The meaning is different.

Checked the help of mysql and found that lowercase u and uppercase U represent different meanings

[mysql@bjdev01 ~]$ mysql --help| egrep 'user|safe-updates'
  -u, --user=name     User for login if not current user.
  -U, --safe-updates  Only allow UPDATE and DELETE that uses keys.
  -U, --i-am-a-dummy  Synonym for option --safe-updates, -U.
  --select-limit=#    Automatic limit for SELECT when using --safe-updates.
                      --safe-updates.
user                              (No default value)
safe-updates                      FALSE

If you add -U to log in to mysql, you must add conditions to the update and deletion of data. .

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