无法与mysql连接

Question

I have 2 connection string in 2 file connect.php connect to 2 mysql database on 2 server.

File dbconnect1:

<?php
$conn = mysql_connect('sv1','root','123456') or dir("No connect");
mysql_select_db('db1')or dir("not connect database");
mysql_query("SET charactor_set_results=utf8",$conn);
mysql_query("SET NAMES 'utf8'");
?>

File dbconnect2:

<?php
$conn = mysql_connect('sv1','root','123456') or dir("No connect");
mysql_select_db('db2')or dir("not connect database");
mysql_query("SET charactor_set_results=utf8",$conn);
mysql_query("SET NAMES 'utf8'");
?>

When I include in file php and exercute query it not show result. One of 2 connection string not work. Why?

Answer 1

I think it is because you use the same variable $conn for both DB connections. Replace it with $conn2 for example in the dbconnect2.php file. At the moment your first connection get overwritten by the second connection. This is because you do them one after another.

Plus you have to put TRUE for the fourth paramether in mysql_connect() function in order to start a new connection to the same DB server. http://php.net/manual/en/function.mysql-connect.php

File dbconnect2:

<?php
$conn2 = mysql_connect('sv1','root','123456', TRUE) or die("No connect");
mysql_select_db('db2', $conn2)or die("not connect database");
mysql_query("SET charactor_set_results=utf8", $conn2);
mysql_query("SET NAMES 'utf8'", $conn2);
?>

Plus you have to point which MySQL connection you want to use in mysql_select_db() function(s) and mysql_query() function(s).

Answer 2

You have to change the second db connection variable say $conn2 and also use the connection statement as follows:

$conn2 = mysql_connect('sv1','root','123456', TRUE) or die("No connect");

Where the 4th parameter has to pass as TRUE.

Reference: http://php.net/manual/en/function.mysql-connect.php