在MySQL的多列中替换相同字符

Question

I want to run this basic replace on columns field01 through field39 without requiring 39 queries:

UPDATE leads
    SET field01 = REPLACE(field01, ' ', '+')
     WHERE field40 = 'in_process';

If it is easier to run with PHP, that would be fine.

Answer 1

You can set multiple columns within a single query:

UPDATE leads
    SET field01 = REPLACE(field01, ' ', '+'),
        field02 = REPLACE(field02, ' ', '+'),
        . . .
        field39 = REPLACE(field39, ' ', '+')
    WHERE field40 = 'in_process';

Typing out the code is cumbersome, You can generate the code using a spreadsheet.

I should not that having dozens of columns that contain similar information is often a sign of bad database design. There is a good chance that you need a junction table, with one row per lead and field value.