How do I pass a variable to a mysql script?

Question

I know that with mysql you can write SQL statements into a .sql file and run the file from the mysql command line like this:

mysql> source script.sql 

How do I pass a variable to the script? For example, if I want to run a script that retrieves all the employees in a department, I want to be able to pass in the number of the department as a variable.

I am not trying to run queries through a shell script. There are simple queries I run from the mysql command line. I'm tired of retyping them all the time, and writing a shell script for them would be overkill.

Answer 1

Like this:

set @department := 'Engineering'; 

Then, reference @department wherever you need to in script.sql:

update employee set salary = salary + 10000 where department = @department; 

Answer 2

    #!/bin/bash      #verify the passed params     echo 1 cmd arg : $1     echo 2 cmd arg : $2      export db=$1     export tbl=$2      #set the params ... Note the quotes ( needed for non-numeric values )     mysql -uroot -pMySecretPaassword \     -e "set @db='${db}';set @tbl='${tbl}';source run.sql ;" ;      #usage: bash run.sh my_db my_table     #     #eof file: run.sh      --file:run.sql      SET @query = CONCAT('Select * FROM ', @db , '.' , @tbl ) ;     SELECT 'RUNNING THE FOLLOWING query : ' , @query ;     PREPARE stmt FROM @query;     EXECUTE stmt;     DEALLOCATE PREPARE stmt;      --eof file: run.sql 

you can re-use the whole concept from from the following project