database

To replace database engine on all tables for the given database. this script will prepare all the command that need to be run.

SET @DATABASE_NAME = '_database_that_you_like_to_change_';

SELECT  CONCAT('ALTER TABLE `', table_name, '` ENGINE=InnoDB;') AS sql_statements
FROM    information_schema.tables AS tb
WHERE   table_schema = @DATABASE_NAME
AND     `ENGINE` = 'MyISAM'
AND     `TABLE_TYPE` = 'BASE TABLE'
ORDER BY table_name DESC;

Just copy result and run as SQL script