Suppose I have this table:
id | name | city
------------------
1 | n1 | c1
2 | n2 | c2
3 | n3 | c3
4 | n4 | c4
I want to check if the value c7
exists under the variable city
or not.
If it does, I will do something.
If it doesn't, I will do something else.
preferred way, using MySQLi extension:
$mysqli = new mysqli(SERVER, DBUSER, DBPASS, DATABASE);
$result = $mysqli->query("SELECT id FROM mytable WHERE city = 'c7'");
if($result->num_rows == 0) {
// row not found, do stuff...
} else {
// do other stuff...
}
$mysqli->close();
deprecated:
$result = mysql_query("SELECT id FROM mytable WHERE city = 'c7'");
if(mysql_num_rows($result) == 0) {
// row not found, do stuff...
} else {
// do other stuff...
}