A better way to execute multiple MySQL commands using shell script - mysql

Question

I would like to write a *.sh script to execute multiple MySQL commands.
Currently, what I can do is something like the following
mysql -h$host -u$user -p$password -e "drop database $dbname;"
mysql -h$host -u$user -p$password -e "create database $dbname;"
mysql -h$host -u$user -p$password -e "another MySQL command"
...
Is there a way to avoid typing mysql -h$host -u$user -p$password -e every time I want to execute a MySQL command?

Answer 1

I think you can execute MySQL statements from a text file, for example
here is the cmds.txt file which contains MySQL commands:
select colA from TableA;
select colB from TableB;
select colC from TableC;
To execute them using shell script, type
mysql -h$host -u$user -p$password db_dbname < cmds.txt
This way, you separate your MySQL commands from your shell script.
You may want your script to display progress information to you. For this you can invoke mysql with "--verbose" option.
For more information, see https://dev.mysql.com/doc/refman/5.6/en/mysql-batch-commands.html

Answer 2

You can use a single multiquery:
mysql -h$host -u$user -p$password -e "drop database $dbname;create database $dbname;another MySQL command;"
Simply write all your queries seperated by ;. They will be run one after the other.

Answer 3

Note that you can also use a HERE doc to have the queries within the same script:
mysql -h$host -u$user -p$password db_dbname <<'EOF'
select colA from TableA;
select colB from TableB;
select colC from TableC;
EOF
Note that I've used 'EOF' rather than EOF in the first line in order to prevent the contents of the script to disable parameter substitution (especially the ` can be problematic)
Also note that there should not be any whitespace before the final EOF (except if you use <<- rather than << -- in that case leading tab characters are stripped):
mysql -h$host -u$user -p$password db_dbname <<- 'EOF'
↠select colA from TableA;
↠select colB from TableB;
↠select colC from TableC;
↠EOF
(Replace the ↠ with a tab character).
For more info on the HERE doc syntax, see the bash documentation.

Answer 4

There are several ways, in linux you have:
From the mysql cli:
mysql> source mycmds.sql
Using Pipes:
echo "SELECT ..; INSERT ..;" | mysql ...
Executing commands from a file using pipes or redirection:
cat file.sql | mysql ... OR mysql .. < file.sql

Answer 5

Different from other answers that reduce repetition, but
there are ways to reduce options(user, host ... -u, -p, -h ...) from each line command
2 ways i know.
1. use my.cnf file
you can store your user information in option files (e.g ~/.my.cnf or etc)
[client]
user=your_username
password=your_password
# database=database_name
then you can just run mysql command with one option -e and query
mysql -e "drop database $dbname;"
mysql -e "create database $dbname;"
mysql -e "another MySQL command"
2. use mysql_config_editor
you can save login informations with mysql_config_editor
mysql_config_editor set --login-path=mypath1 --host=localhost --user=root --password
then run command just with login-path option
mysql --login-path=mypath1 -e "drop database $dbname;"
mysql --login-path=mypath1 -e "create database $dbname;"
mysql --login-path=mypath1 -e "another MySQL command"