Question

I have a PHP script search script that logs every query made in a MySQL database. Currently, if the same terms are searched more than once, a duplicate of the query will be added to the database. How can I make it so when a term is already in the database +1 is added to a column titled value?

My PHP code is:

<?php

$database=mysql_connect("localhost","username","password");
mysql_select_db("database",$database);

$query=$_GET['q'];

logQuery($query);
function logQuery($query){
$query="insert into queries (query) values ('$query')";
mysql_query($query);
}

?>

Answer 1

First, create a unique index on the query field using:

CREATE UNIQUE INDEX query_idx ON queries (query)

Then, alter your INSERT query to update the value field when a duplicate query is found (it will hit the query_idx index):

INSERT INTO queries (query) VALUES ('$query')
ON DUPLICATE KEY UPDATE value = value + 1

Take a look at the documentation for INSERT ... ON DUPLICATE KEY UPDATE for more details about this.

Also, don’t forget to use mysql_real_escape_string($query) instead of simply using $query, because if you don’t escape the string and the $query variable contains, for example, ' characters, it will corrupt your INSERT query.