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backup mysql db like webAdmin

I would like to create a php function to export the structure and data from my mySQL db   and save it as file.sql.

I will then add this function to my list of scheduled tasks

I am using the following to connect to the db:
	function dbConnect()
	{
		$mysql_local = ""; 
		$mysql_db = ""; 
		$db_user = ""; 
		$db_user_pass = "";		
		if(!isset($oConn))
		{
			$oConn = @mysql_pconnect($mysql_local,$db_user,$db_user_pass) or die ("Could not connect to local server");
			mysql_select_db($mysql_db) or die ("Unable to select database");				
		}
	}

	function dbDisconnect()
	{
		if(isset($oConn))
		{
			mysql_close ($oConn);
		}		
	}

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prowebinteractiveinc
Asked:
prowebinteractiveinc
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1 Solution
 
tailoreddigitalCommented:
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prowebinteractiveincAuthor Commented:
Im getting this error..
There was a warning during the export of dbName to ~/chooseFilenameForBackup.sql

Im looking for it to do exactly what webAdmin does, accept, it writes the contents to a file in a folder on the server.
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Ray PaseurCommented:
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prowebinteractiveincAuthor Commented:
it looks complicated !
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Ray PaseurCommented:
It's not complicated when compared to rebuilding a data base that wasn't backed up!
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prowebinteractiveincAuthor Commented:
Hi Ray. I found the code below on the page of the link you sent me. I see that it connects through root, and takes a copy of all the databases, what if I want just one particular database and dont have root access, but just need my db anyways and to save it to a folder with in the root of the website im working on. can I not just connect to it like I connect to it now to do the mysqldump ? what can I modify in the code below to do exactly what I need ?

Thanks
    $username = "root";
    $password = "password";
    $backup_dir = "/mnt/backup";
    $dump = "/usr/bin/mysqldump";
    $grep = "/bin/grep";
    $gzip = "/bin/gzip";

        // This should not need changing from here

    function sql_dict($sql){
        $x = mysql_query($sql);
        if ($x) return mysql_fetch_assoc($x);
    }
    
    function cleanup($dir){
        $d = dir($dir);
        echo "Path: " . $d->path . "\n";
        while (false !== ($entry = $d->read())) {
            if ($entry=="." or $entry=="..") continue;
            $e = str_replace(".sql.gz","",$entry);
            $x = sql_dict("describe $e");
            if (!$x) {
                print "Removing old backup file [$entry]\n";
                unlink("$dir/$entry");
            }
        }
        $d->close();
    }

    function crc32_file($filename)
    {
          global $gzip;
        $x = exec("$gzip --list --verbose $filename");
        $x = explode(" ",$x);
        return $x[1];
    }

    if (mysql_connect("localhost",$username,$password)) print "Connected.\n";
    else die("Failed to connect to database."); 
    $dbs = mysql_query("show databases");
    if ($dbs) while ($db = mysql_fetch_array($dbs, MYSQL_ASSOC)) {
        $db = $db['Database'];
        if ($db=="information_schema") continue;
        if (mysql_select_db($db)) print "Selected [$db]\n";
        else die("Failed to select db [$db]");
        foreach (array("schema","data") as $pass){
            $sql = mysql_query("show tables");
            $day = date("l");
            if ($pass=="schema") $dir = "/$backup_dir/$db/schema";
            else $dir =  "/$backup_dir/$db/$day";
            if (!file_exists($dir)) system("mkdir -p $dir");
            if (!file_exists($dir)) die("Couldn't Create $dir");
            if ($pass=="data"){
                $latest = "/$backup_dir/$db/latest";
                unlink($latest);
                system("/bin/ln -s \"$dir\" \"$latest\"");
            }            
            cleanup($dir);
            if ($sql) while ($s = mysql_fetch_assoc($sql)) {
                if (!isset($s["Tables_in_{$db}"])) {
                    print "no result";
                    print_r($sql);
                    die();
                }
                $t = $s["Tables_in_{$db}"];
                if (
                 $pass=="schema" ) $data = "--no-data";
                 else $data = "--lock-tables";
                 $tab = $t;
                 $lim = 30;
                 if (strlen($tab)>$lim) $tab = substr($tab,0,$lim-3)."...";
                 while (strlen($tab)<30) $tab .= " ";
                print "BACKUP: $pass : $day : $db : $tab : ";
                if ($pass=="data"){
                    print "Check : ";
                    $check = sql_dict("check table $t");
                    $check = $check['Msg_text'];
                    print "$check : ";
                    if ($check != "OK") {
                        print "Repair";
                        $repair = sql_dict("repair table $t");
                        $repair = $repair['Msg_text'];
                        print " : $repair : ";
                    }
                    if ($day=="Sunday"){
                        // optimize
                        print "Optimize : ";
                        $type = sql_dict("show table status like '$t'");
                        $type = $type['Engine'];
                        if ($type=="MyISAM") sql("optimize table $t");
                        if ($type=="InnoDB") sql("alter table $t engine='InnoDB'");
                    }
                }
                if (isset($argv[1])){
                    print "Skipping dump\n";
                } else {
                    $temp = "/tmp/backup.$t.sql.gz";
                    $out  = "$dir/$t.sql.gz";
                    print "Dump : ";
                    $cmd = "$dump -u$username -p$password $data --quick --add-drop-table $db $t | $grep -v 'Dump completed' | $gzip -n > $temp";
                    system($cmd);
                    print "CRC32 : ";
                    if (!file_exists($out)){
                        print "Saving  : ";
                        $cmd = "/bin/mv $temp $out";
                        system($cmd);
                    } else {
                        $md5  = crc32_file($temp);
                        $nmd5 = crc32_file($out);
                        if ($md5!=$nmd5) {
                            print "Saving  : ";
                            $cmd = "/bin/mv $temp $out";
                            system($cmd);
                        } else {
                            print "Skipped : ";
                            unlink($temp);
                        }
                    }
                    $size = filesize($out);
                    print "[$size]\n";
                }
            }
        }
    }
?>

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Ray PaseurCommented:
I don't know.  You would have to go through the code line-by-line.  I would probably look for the part where it finds all of the data bases, and then right after that part I would override the list of data bases with the name of the data base that I want.
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prowebinteractiveincAuthor Commented:
ok, well I have no permissions to the file now. Im going to to use chown but how can I dynamically get my username if I use exec('whoami'); it gives me apache
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Ray PaseurCommented:
Maybe a different approach.  Do you have phpMyAdmin installed?
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prowebinteractiveincAuthor Commented:
yes I have it installed.
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Ray PaseurCommented:
You can use phpMyAdmin to do backups. I've never tried to automate any processes with it, but there may be some hope ;-)

I can show you a script that will back up a single table.  If you can give it a list of tables (or call it repeatedly passing a single table each time) that might be a workable option.
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prowebinteractiveincAuthor Commented:
OK.  in php my admin when you go to export you can choose to export structure and/or data
then you choose the compression. if no compression is chosen, then it shows the export in a large textarea - this is what im looking for in the end. Im want to save all the tables and data in an uncompresed file. im also having issues with permissions now. as you can see on line 3  the directories are being made. how do I chown and / or chmod for all the parent directories
if ($pass=="schema") $dir = "/$backup_dir/$db/schema";
else $dir =  "/$backup_dir/$db/$day";
if (!file_exists($dir)) system("mkdir -p $dir");
if(!chmod($dir, 0777)){ print "Permissions change error."; };

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Thanks
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prowebinteractiveincAuthor Commented:
Ray_Paseur for future reference. the follwing line of code is all that is needed to do what I needed.
exec("mysqldump --user=" . $db_user . " --password=" . $db_user_pass . " --host=" . $mysql_host . " " . $mysql_db . " > " . $dir);

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Thanks for your assistance.
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