Question

I have a table with structure: id(INT, PK), entryid(INT), date(INT), region(CHAR), location(ENUM), views(INT). All fields except id are non-unique.

How do I insert a record, so that if there is same entryid,date,region,location, then ignore, otherwise insert to table?

BTW, I am using mysql.

Answer 1

Yes, there’s a special version of the insert statement in mysql for this:

INSERT INTO table
VALUES (...)
ON DUPLICATE KEY UPDATE entryid = ?, etc -- this modifier will do the trick

Consult the mysql manual entry for this syntax for a full explanation

Edit:

This behaviour works on the primary key being identical. To make it work on multiple columns, you need a multi-column primary key, which you would define for your table like this:

create table mytable (
    entryid int,
    date int,
    region char,
    location enum ('a', 'b', 'c'),
    views int,
    primary key (entryid, date, region, location) -- list your key field like this
);