/SQL/Mysql loop through databases and execute query

Mysql loop through databases and execute query

delimiter //
DROP PROCEDURE IF EXISTS create_procedures//
CREATE PROCEDURE create_procedures()
BEGIN
    DECLARE done INT DEFAULT 0;
    DECLARE db VARCHAR(255);
    DECLARE appDBs CURSOR FOR SELECT schema_name FROM information_schema.schemata WHERE schema_name LIKE 'application_%';
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

    SET @procName = "simpleproc"; -- Change this to your proc name

    SET @output = "delimiter //";

    OPEN appDBs;
    REPEAT
        FETCH appDBs INTO db;
        IF NOT done THEN
            -- Replace this procedure declaration with your procedure.
            -- Make sure to keep the ',db,' syntax there.
            -- You should really only have to change the parameters
            -- and the stuff between the BEGIN and END clauses.
            SET @output = CONCAT(@output,'
    DROP PROCEDURE IF EXISTS ',db,'.',@procName,'//
    CREATE PROCEDURE ',db,'.',@procName,'()
        BEGIN
            SELECT 1;
        END//');

        END IF;
    UNTIL done END REPEAT;

    CLOSE appDBs;

    SET @output = CONCAT(@output,'\ndelimiter ;');

    SELECT @output AS procs;
END//
delimiter ;

Source: stackoverflow.com

Similar codes

0 vote260 views1 answer
Create table with timestamp mysql youtube
SQL
1 vote182 views1 answer
Store select query result in variable sql server
SQL
0 vote204 views3 answers
Duplicate row mysql
SQL
0 vote193 views1 answer
Why we have to set the password for my sql server
SQL
0 vote205 views1 answer
Oracle execute immediate quotes
SQL
0 vote191 views1 answer
Sql add calculated column
SQL
0 vote188 views1 answer
T-sql update table variale
SQL
11 votes197 views3 answers
Python sqlite3 create table if not exists
SQL
0 vote204 views1 answer
ERROR: column "hourly_visitors.hour" must appear in the GROUP BY clause or be used in an aggregate function
SQL
4 votes157 views2 answers
Select todays data postgres query
SQL