Question

I’m trying to make the statement that inserts or updates the record depending on its presence in the table. If the record in the “drug_name_pl” field is present, it will increase its “vote_sum” value by 1.
The problem is that the statement creates evey time the a record while trying to update already existing field.

Here is the table structure:

               Field            Type       Null Key Default Extra
                id              int(11)    NO   PRI NULL    auto_increment
                drug_name_pl    varchar(11)NO   MUL NULL      
                vote_sum        int(11)    NO       NULL

And the query:

$query = "INSERT INTO lek_podstawowe(drug_name_pl) VALUES ('$drug_name_pl') 
ON DUPLICATE KEY UPDATE vote_sum=vote_sum+1"; 

Answer 1

you need to add unique key on drug_name_pl

something like:

CREATE UNIQUE INDEX drug_name_pl_unique ON table_name (drug_name_pl)

do not forget to change table_name to the real name of your table. Please also make sure you escape $drug_name_pl properly to protect application form sql injection