PHP - Establish Multiple Mysql Db Connections

Ok I'm trying to insert multiple rows by using a while loop but having problems. At the same time, need to open a new mysql connection while running the insert query, close it then open the previous mysql connection.

I managed to insert multiple queries before using a loop, but for this time, the loop does not work? 
I think it is because I am opening another connection... yh that would make sense actually?

Here is the code:


$users = safe_query("SELECT * FROM ".PREFIX."user");
       while($dp=mysql_fetch_array($users)) { 
          
   $username = $dp['username'];
 $nickname = $dp['nickname'];
 $pwd1 = $dp['password']; 
 $mail = $dp['email'];
 $ip_add = $dp['ip'];
 $wsID = $dp['userID'];
 $registerdate = $dp['registerdate'];
 $birthday = $dp['birthday'];
 $avatar = $dp['avatar'];
 $icq = $dp['icq']; 
 $hp = $dp['homepage'];
 
echo $username." = 1 username only? :(";
      

// ----- Forum Bridge user insert -----

$result = safe_query("SELECT * FROM `".PREFIX."forum`");
$ds=mysql_fetch_array($result);
$forum_prefix = $ds['prefix'];
define(PREFIX_FORUM, $forum_prefix);
define(FORUMREG_DEBUG, 0);

$con = mysql_connect($ds['host'], $ds['user'], $ds['password']) or system_error('ERROR: Can not connect to MySQL-Server');
$condb = mysql_select_db($ds['db'], $con) or system_error('ERROR: Can not connect to database "'.$ds['db'].'"');
                
include('../_phpbb_func.php');
$phpbbpass = phpbb_hash($pwd1);
$phpbbmailhash = phpbb_email_hash($mail);
$phpbbsalt = unique_id();

safe_query("INSERT INTO `".PREFIX_FORUM."users` (`username`, `username_clean`, `user_password`, `user_pass_convert`, `user_email`, `user_email_hash`, `group_id`, `user_type`, `user_regdate`, `user_passchg`, `user_lastvisit`, `user_lastmark`, `user_new`, `user_options`, `user_form_salt`, `user_ip`, `wsID`, `user_birthday`, `user_avatar`, `user_icq`, `user_website`) VALUES ('$username', '$username', '$phpbbpass', '0', '$mail', '$phpbbmailhash', '2', '0', '$registerdate', '$registerdate', '$registerdate', '$registerdate', '1', '230271', '$phpbbsalt', '$ip_add', '$wsID', '$birthday', '$avatar', '$icq', '$hp')");
if (FORUMREG_DEBUG == '1') {
echo "<p><b>-- DEBUG -- : User added: ".mysql_affected_rows($con)."<br />";
       echo "<br />-- DEBUG -- : Query used: ".end($_mysql_querys)."</b></p><br />";
      
       $result = safe_query("SELECT user_id from ".PREFIX_FORUM."users WHERE username = '$username'");
       $phpbbid = mysql_fetch_row($result);
safe_query("INSERT INTO `".PREFIX_FORUM."user_group` (`group_id`, `user_id`, `group_leader`, `user_pending`) VALUES ('2', '$phpbbid[0]', '0', '0')");
safe_query("INSERT INTO `".PREFIX_FORUM."user_group` (`group_id`, `user_id`, `group_leader`, `user_pending`) VALUES ('7', '$phpbbid[0]', '0', '0')");
mysql_close($con);
}

         include('../_mysql.php');        
         mysql_connect($host, $user, $pwd) or system_error('ERROR: Can not connect to MySQL-Server');
mysql_select_db($db) or system_error('ERROR: Can not connect to database "'.$db.'"');
       
       }



So I need to be able to insert these rows using the while loop.. how can I do this?

I really appreciate any help.

Hi All

 

I have not really played around with PHP in ages so I am having a hard time trying to figure out the best way to proceed. Anyhow... what I need to get done is to take a singleton pattern core database class that has a extended driver based class (ie; the type of database server the connection is connecting to), and build a new class that dynamically handles as many driver based connections that are called using a single instance. As a side note, I tried PDO but it only supports a single driver per class instance, and then each of those connections cannot not have their on set of properties that relate to each connection. Anyway, I was thinking that the best way to handle all the driver specific connections, is to hand out a 'unique hash reference' that points to an array of connection objects and the object properties. then when the client runs any sql function they pass the 'unique hash reference'  which the class then returns the object and it properties that will be used by the class to call up the driver specific sql function that was requested by the client. So what do you all thing about that....

 

TIA

stephanieT

 

PS...

 

I reason i need this is because I need to update up 25 different databases based on data stored on all the databases and  not all of the database servers are of the same type, (ie; MSSQL, Oracle, MySQL, MariaDB, berkeley DB, postgres, sqlite2,3, etc, etc)!

Edited January 16, 2019 by StephanieT

On my new site on average every page that loads opens  9 MySql connections and runs 14 MySql Queries, And as I use Ajax to dynamically update the pages, so this repeats every 60 seconds per page.

Is this too many connections?
I am not having any problems at the moment but the site is getting more busy, and I don't want the site to start running slow, or the MySql server to crash.

Any comment would be much appreciated.

   

Hi, I am quite new to using php classes so it maybe something simple here, however I am trying to establish to connection to two different databases using one PHP class; The problem is that this will work for one but when I create a new connection they will both fail.   

<?php
putenv("TZ=Europe/London");
 
// start database connection
$funky_db = new Database('xxxx', 'xxxx', 'xxxx', 'xxxx');
 
// start database connection
$funky_cc = new Database('xxxx', 'xxxx', 'xxxx', 'xxxx');
 
class Database {
 
    private $host;
    private $user;
    private $pass;
    private $name;
    private $link;
    private $error;
    private $errno;
    private $query;
 
    function __construct($host, $user, $pass, $name = "", $conn = 1) {
        $this -> host = $host;
        $this -> user = $user;
        $this -> pass = $pass;
        if (!empty($name)) $this -> name = $name;      
        if ($conn == 1) $this -> connect();
    }
 
    function __destruct() {
        @mysql_close($this->link);
    }
 
    public function connect() {
        if ($this -> link = mysql_connect($this -> host, $this -> user, $this -> pass, TRUE)) {
            if (!empty($this -> name)) {
                if (!mysql_select_db($this -> name)) $this -> exception("Could not connect to the database!");
            }
        } else {
            $this -> exception("Could not create database connection!");
        }
    }
 
    public function close() {
        @mysql_close($this->link);
    }
 
    public function query($sql) {
        if ($this->query = @mysql_query($sql)) {
            return $this->query;
        } else {
            $this->exception("Could not query database!".$this->name);
            return false;
        }
    }
 
    public function num_rows($qid) {
        if (empty($qid)) {         
            $this->exception("Could not get number of rows because no query id was supplied!");
            return false;
        } else {
            return mysql_num_rows($qid);
        }
    }
 
    public function fetch_array($qid) {
        if (empty($qid)) {
            $this->exception("Could not fetch array because no query id was supplied!");
            return false;
        } else {
            $data = mysql_fetch_array($qid);
        }
        return $data;
    }
 
    public function fetch_array_assoc($qid) {
        if (empty($qid)) {
            $this->exception("Could not fetch array assoc because no query id was supplied!");
            return false;
        } else {
            $data = mysql_fetch_array($qid, MYSQL_ASSOC);
        }
        return $data;
    }
 
public function fetch_object($qid) {
        if (empty($qid)) {
            $this->exception("Could not fetch object assoc because no query id was supplied!");
            return false;
        } else {
            $data = mysql_fetch_object($qid);
        }
        return $data;
    }
 
    public function fetch_all_array($sql, $assoc = true) {
        $data = array();
        if ($qid = $this->query($sql)) {
            if ($assoc) {
                while ($row = $this->fetch_array_assoc($qid)) {
                    $data[] = $row;
                }
            } else {
                while ($row = $this->fetch_array($qid)) {
                    $data[] = $row;
                }
            }
        } else {
            return false;
        }
        return $data;
    }
 
    public function last_id() {
        if ($id = mysql_insert_id()) {
            return $id;
        } else {
            return false;
        }
    }
 
    private function exception($message) {
        if ($this->link) {
            $this->error = mysql_error($this->link);
            $this->errno = mysql_errno($this->link);
        } else {
            $this->error = mysql_error();
            $this->errno = mysql_errno();
        }
        if (PHP_SAPI !== 'cli') {
        ?>
 
            <div class="alert-bad">
                <div>
                    Database Error
                </div>
                <div>
                    Message: <?php echo $message; ?>
                </div>
                <?php if (strlen($this->error) > 0): ?>
                    <div>
                        <?php echo $this->error; ?>
                    </div>
                <?php endif; ?>
                <div>
                    Script: <?php echo @$_SERVER['REQUEST_URI']; ?>
                </div>
                <?php if (strlen(@$_SERVER['HTTP_REFERER']) > 0): ?>
                    <div>
                        <?php echo @$_SERVER['HTTP_REFERER']; ?>
                    </div>
                <?php endif; ?>
            </div>
        <?php
        } else {
                    echo "MYSQL ERROR: " . ((isset($this->error) && !empty($this->error)) ? $this->error:'') . "\n";
        };
    }
 
}
?>

I've looked every where, probably googled every variation of my question I could come up with and I've tried all of the suggestions...  I'm trying to connect to two different DBs in two different locations ($local and $remote) and only the second one works.  Here is a sample of my code ("..." = hidden):

//-------------Local DB Connection:
    $local = mysql_connect("localhost","root","...");
    if (!$local)
    {
        die('Could not connect: ' . mysql_error());
    }
    $sel1 = mysql_select_db("new", $local);
//-------------Remote DB Connection:
    $remote = mysql_connect("...","...","...",true);
    if (!$remote)
    {
        die('Could not connect: ' . mysql_error());
    }
    $table = "...";

//---------function selecting from local:
    function fncGrabNemsis($ele,$val){
        mysql_select_db("new", $local);
        $result = mysql_query("SELECT * FROM new.tblvalues
        WHERE fldelement='$ele' AND fldcode='$val'",$local);
        $tmprow = mysql_fetch_array($result);
        return (isset($tmprow['fldvariable'])?$tmprow['fldvariable']:$val);
    }

//----------Select run from Remote:
        mysql_select_db("ImdxTest", $remote);
        $result = mysql_query("SELECT * FROM ImdxTest.$table WHERE ClientID = ... AND IncidentNum = '$fldINCID'", $remote) or die(mysql_error());
        $row = mysql_fetch_array($result);

I've tried moving the mysql_select_db() function calls everywhere you can think of and just about everything else...  What happens is, I get php errors saying that $local is not defined or that the mysql function that are trying to use the $local connection are expecting parameters to be resources!?  I know for a fact that both connections work because individually they both work.  Only the second connection ($remote) works...  Thanks a lot for any suggestions!