Replace a word in BLOB text by MySQL

In some cases it is needed to save texts BLOB. In my case, for whatever reason Drupal 7 developers choose to use a blob for all TEXT columns - this is out of developer's control.

To convert a blob to text, use the MySql convert function. Then you have to save it into the database and convert it again to blob - but this is handled automatically by MySQL. So the following query would do the trick:

UPDATE tcountriesnew 
SET slogen = replace(CONVERT(slogen USING utf8), 'bananas', 'apples')
WHERE slogen LIKE '%bananas%';

On MySQL 5.5, This resolved my issue completely.

Also, configure your PhpMyAdmin to show Blob data

Depends what you mean by "replace"; using replace to show modified text in select:

select replace(slogen, 'bananas', 'apples') from tcountriesnew where slogen like '%bananas%';

Or update data in a table:

update tcountriesnew set slogen=replace(slogen, 'bananas', 'apples') where slogen like '%bananas%';

BTW. Why are you using blob for text? You should use text type for textual data and blob for binary data.