/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 vote158 views2 answers
Plsql function that return a table
SQL
3 votes157 views2 answers
Get current year sql
SQL
0 vote143 views1 answer
Postgresql add not null and not empty constraint
SQL
0 vote172 views1 answer
Get from database the most recent data limit by 5
SQL
0 vote148 views1 answer
Sql developer search all packages for text
SQL
0 vote222 views1 answer
Run docker container with database as rds metabase
SQL
0 vote187 views1 answer
Create table as select sql server error
SQL
0 vote188 views1 answer
How to find sql server name
SQL
0 vote144 views1 answer
Sqldf change user
SQL
0 vote152 views2 answers
Sql select inside select
SQL