mostlymatter/server/channels/db/migrations/mysql/000090_create_enums.down.sql

SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
        WHERE table_name = 'Channels'
        AND table_schema = DATABASE()
        AND column_name = 'Type'
        AND column_type != 'varchar(1)'
    ) > 0,
    'ALTER TABLE Channels MODIFY COLUMN Type varchar(1);',
    'SELECT 1'
));

PREPARE alterIfExists FROM @preparedStatement;
EXECUTE alterIfExists;
DEALLOCATE PREPARE alterIfExists;

SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
        WHERE table_name = 'Teams'
        AND table_schema = DATABASE()
        AND column_name = 'Type'
        AND column_type != 'varchar(255)'
    ) > 0,
    'ALTER TABLE Teams MODIFY COLUMN Type varchar(255);',
    'SELECT 1'
));

PREPARE alterIfExists FROM @preparedStatement;
EXECUTE alterIfExists;
DEALLOCATE PREPARE alterIfExists;

SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
        WHERE table_name = 'UploadSessions'
        AND table_schema = DATABASE()
        AND column_name = 'Type'
        AND column_type != 'varchar(32)'
    ) > 0,
    'ALTER TABLE UploadSessions MODIFY COLUMN Type varchar(32);',
    'SELECT 1'
));

PREPARE alterIfExists FROM @preparedStatement;
EXECUTE alterIfExists;
DEALLOCATE PREPARE alterIfExists;