how do i loop from terminal without excessive password requests

问题

When running the following mysql code from a linux (CentOS 7) terminal, the following command appears to be asking for the password for EVERY table in the loop. There are 500+ tables. It is not reasonable for me to type in a password 500+ times. How can I fix the code below so that it only asks for the password a couple times?

mysql -u root -p -Nse 'show tables' DATABASE_NAME | while read table; do mysql -u root -p -e "SET FOREIGN_KEY_CHECKS = 0; truncate table $table" DATABASE_NAME; done;

EDIT:

Is there a way to do this without having to put the password in the command line logs?

回答1:

Put the password after the p (no space), say your password is PASSWORD

mysql -u root -pPASSWORD -Nse 'show tables' DATABASE_NAME | while read table; do mysql -u root -pPASSWORD -e "SET FOREIGN_KEY_CHECKS = 0; truncate table $table" DATABASE_NAME; done;

回答2:

Consider re-writing this, so that it only uses two database sessions. One to produce a list of statements to execute into a file, and second (single) to process the statements. There's potential for something to go wrong with the first query session, so I'd be careful to separate them into two tasks.

In the first session, suppress the formatting, and redirect stdout to a file

SELECT 'set foreign_key_checks = 0;' AS stmt

SELECT CONCAT('TRUNCATE TABLE `',t.table_schema,'`.`',table_name,'`;') AS stmt
  FROM information_schema.tables t
 WHERE t.table_schema = 'mydatabase'
 ORDER BY t.table_name ;

Verify that the file contains what you want.

Then (another useless use of cat) pipe the contents of that file into mysql

cat myfile | mysql -u me -p --database mydatabase

来源：https://stackoverflow.com/questions/27933828/how-do-i-loop-from-terminal-without-excessive-password-requests

标签

mysql

sql

Linux

terminal

CentOS