create proc usong flyway example

Example: create proc usong flyway example

DELIMITER $$

DROP PROCEDURE IF EXISTS upgrade_database_1_0_to_2_0 $$

CREATE PROCEDURE upgrade_database_1_0_to_2_0()

BEGIN

-- rename a table safely

IF NOT EXISTS( (SELECT * FROM information_schema.COLUMNS WHERE TABLE_SCHEMA=DATABASE()

AND TABLE_NAME='my_old_table_name') ) THEN

RENAME TABLE

my_old_table_name TO my_new_table_name,

END IF;

-- add a column safely

IF NOT EXISTS( (SELECT * FROM information_schema.COLUMNS WHERE TABLE_SCHEMA=DATABASE()

AND COLUMN_NAME='my_additional_column' AND TABLE_NAME='my_table_name') ) THEN

ALTER TABLE my_table_name ADD my_additional_column varchar(2048) NOT NULL DEFAULT '';

END IF;

END $$

CALL upgrade_database_1_0_to_2_0() $$

DELIMITER ;