how avoid dublicate data to mysql

Question

I write the code to scrap car info(title, make, model, transmission, year, price) data from ebay.com and save in the mysql, I want if all row\'s(title, make, model, ...) item\'s

Answer 1

One option uses not exists:

insert into car_info (title, maker, model, transmission, year, price) 
select v.*
from (select %s title, %s maker, %s model, %s transmission, %s year, %s price) v
where not exists (
    select 1
    from car_info c
    where 
        (c.title, c.maker, c.model, c.transmission, c.year, c.price)
         = (v.title, v.maker, v.model, v.transmission, v.year, v.price)
);

But it would be simpler to create a unique key on all columns of the table, like:

create unique index idx_car_info_uniq
    on car_info(title, maker, model, transmission, year, price); 

This prevents any process from inserting duplicates in the table. You can elegantly ignore the erros that would otherwise have been raised with the on duplicate key syntax:

insert into car_info (title, maker, model, transmission, year, price) 
values (%s, %s, %s, %s, %s, %s)
on duplicate key update title = values(title);