Mysql query check the blob column type in where clause

问题

I found out that CONVERT(object USING utf8) is for converting blob to text, but it doesn't seem efficient in the where clause, like this:

Select * 
from Page 
where CONVERT(Page.page_title USING utf8) = 'AccessibleComputing'

Is this the only way and the correct way? because it is taking too much time. Or should I convert 'AccessibleComputing' to binary in a way and then put it there?

回答1:

I tried this and it worked:

Select * from Page where Page.page_title = 'AccessibleComputing'

I think after all it doesn't need any conversion.

回答2:

Do these work?

Select *, CAST(Page.page_title AS CHAR(10000) CHARACTER SET utf8) AS Tmp
from Page
where Tmp = 'AccessibleComputing'

OR

Select *, CONVERT(Page.page_title USING utf8) AS Tmp
from Page
where Tmp = 'AccessibleComputing'

来源：https://stackoverflow.com/questions/28903599/mysql-query-check-the-blob-column-type-in-where-clause