2个不同主机之间的2个MySQL连接

Question

I have 2 connection database (MySQL) in different host like this:

//database 1
$dbhost='localhost';
$dbuser='user1'; 
$dbpass='pass1';
$dbname='dbname1';

//database 2
$dbhostams='192.168.16.3';
$dbuserams='user2';
$dbpassams='pass2';
$dbnameams='dbname2';  

function dbconnection($dbhost,$dbuser,$dbpass,$dbname){
    if(!mysql_connect($dbhost,$dbuser,$dbpass)){
        echo "Error occure on opening connection or database. Period.";
    }else{
        if(!mysql_select_db($dbname)){
            echo "Error occure on select databases !";
        }
    }
}
function dbconnectionams($dbhostams,$dbuserams,$dbpassams,$dbnameams){
    $cxn = mysql_connect($dbhostams,$dbuserams,$dbpassams,$dbnameams);
    if( $cxn === FALSE ) {  
        die('mysql connection error: '.mysql_error()); 
    }else{
        if( !mysql_select_db($dbnameams) ){
            echo "Error occure on select databases !";
        }
    }
}

when i use:

dbconnection($dbhost,$dbuser,$dbpass,$dbname);

at my page code, and use:

dbconnectionams($dbhostams,$dbuserams,$dbpassams,$dbnameams);

at another line of code in same page, error occured, like this:

Warning: Access denied for user: 'apache@localhost' (Using password: NO) in
/home/firman/html/fdrsimpeg/sdm-aam/include/dbclass.php on line 17

Warning: MySQL Connection Failed: Access denied for user: 'apache@localhost'
(Using password: NO) in /home/firman/html/fdrsimpeg/sdm-aam/include/dbclass.php
on line 17

mysql connection error:

what must i do to solve this problem?

Answer 1

You need to pass true as fourth parameter to the mysql_connect function.

$database1 = mysql_connect($host1, $user1, $pass1); 
$database2 = mysql_connect($host2, $user2, $pass2, true); 

mysql_select_db('database1', $database1);
mysql_select_db('database2', $database2);

And to query your database use this:

mysql_query('SELECT * FROM table', $database1);
mysql_query('SELECT * FROM table', $database2);

Check this answer here on Stackoverflow.... link

Answer 2

First of all, change the variable names, it will be easier for you to read the code ... Second, the problem seems to be with the connection, as it is detecting that the username is "apache". Check the variables names in the functions ... change them and try again.

//database 1
$dbhost='localhost';
$dbuser='user1'; 
$dbpass='pass1';
$dbname='dbname1';

//database 2
$dbhostams='192.168.16.3';
$dbuserams='user2';
$dbpassams='pass2';
$dbnameams='dbname2';  

function dbconnection($_dbhost,$_dbuser,$_dbpass,$_dbname){
    if(!mysql_connect($_dbhost,$_dbuser,$_dbpass)){
        echo "Error occure on opening connection or database. Period.";
    }else{
        if(!mysql_select_db($_dbname)){
            echo "Error occure on select databases !";
        }
    }
}
function dbconnectionams($_dbhostams,$_dbuserams,$_dbpassams,$_dbnameams){
    $cxn = mysql_connect($_dbhostams,$_dbuserams,$_dbpassams,$_dbnameams);
    if( $cxn === FALSE ) {  
        die('mysql connection error: '.mysql_error()); 
    }else{
        if( !mysql_select_db($dbnameams) ){
            echo "Error occure on select databases !";
        }
    }
}

Answer 3

Your global variables ( $dbhost , $dbuser , etc.) are not within the scope of your function calls; for example, if those function calls take place within another function, you will need to declare the variables within the function with the global keyword in order to access them (otherwise PHP thinks you're referring to different variables of the same name that are local to the function):

function foo() {
  global $dbhost, $dbuser, $dbpass, $dbname;
  dbconnection($dbhost,$dbuser,$dbpass,$dbname);
}

Read more on PHP variable scope .

Answer 4

I didn't see anything obviously wrong, I tested your code as provided and both connections worked.

Check to see if mysql.default_user , mysql.default_host etc. is set within your php.ini