variable database name

Question

Is there any way in MySQL to put the name of the database into a variable? For example, when I have a database called \'db1\', can I do something like this:

Answer 1

With considerable effort, yes.

SET @db = 'db1';
SET @q = CONCAT('SELECT * FROM ', @db, '.mycol');
PREPARE stmt FROM @q;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;