Deploying to hundreds of mysql databases [duplicate] - mysql

Question

Is there any way to easily create a stored procedure on multiple MySQL databases at once? All the databases are on the same MySQL install.

Answer 1

Installing in all schemas
To get a list of the schemas, use show databases;. Combine this with -- use:
use schemaA;
-- use schemaB;
-- use schemaC;
create procedure ...
Manually iterate through the schemas, removing and uncommenting use clauses as you move on, checking that everything works out. In MySQL Workbench, Ctrl+Shift+Enter is your friend.
Installing routines in a subset of schemas
Normally you don't want to install the stored routine in all schemas on a server, but only in a subset --- often defined by the set of schemas which already have some specific stored routine installed. Then, as discussed on SO, you can use a query like this to get the names of the relevant schemas:
SELECT ROUTINE_SCHEMA FROM `information_schema`.`ROUTINES` where specific_name = 'MyRoutine';
Verification
After deploying routines, to verify the existence of them, you can use a query like this:
SELECT distinct
r1.ROUTINE_SCHEMA,
case when r2.specific_name is not null then '' else '####' end as RoutineName1,
case when r3.specific_name is not null then '' else '####' end as RoutineName2,
case when r4.specific_name is not null then '' else '####' end as RoutineName3
FROM
`information_schema`.`ROUTINES` as r1
LEFT JOIN (select * from `information_schema`.`ROUTINES` where specific_name = 'RoutineName1') as r2 on r1.routine_schema = r2.routine_schema
LEFT JOIN (select * from `information_schema`.`ROUTINES` where specific_name = 'RoutineName2') as r3 on r1.routine_schema = r3.routine_schema
LEFT JOIN (select * from `information_schema`.`ROUTINES` where specific_name = 'RoutineName3') as r4 on r1.routine_schema = r4.routine_schema
where
r1.specific_name = 'FilteringRoutineName';
This query will check whether RoutineName1, RoutineName2 and RoutineName3 exist in the database schemas on your server which have the routine FilteringRoutineName. If a routine is missing, it will be marked with ####.
Of course, this only checks for routine existence. To verify their implementation, you may need a database diff tool (such as MySQL Compare or similar).

Answer 2

Assuming you are using Linux, a simple BASH loop with an array of schema names will let you do this.
Save your procedure definition to a file (e.g. myproc.sql), then use the file as input to mysql in the loop. If you put your sign-in details in ~/.my.cnf you can also avoid having to put usernames and passwords on the cmdline.
for i in dbname1 dbname2 dbname3; do mysql ${i} < myproc.sql; done;

Answer 3

I would recommend doing a copy-paste and create the stored procedure in each database schema if they need to be available to that schema only. Otherwise I would follow the recommendation from 'Kelly Vista' and just refer to the stored procedure located in one of the schema's.