Hatim Hatim - 8 days ago 5
MySQL Question

How to Check if value exists in a MySQL database

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
is exists under the variable
city
or not.

If the answer is 'yes' I will do something.

If the answer is 'no', I will do something else.

Answer

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...
}
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