Postgresql backup and restore php script

[ivan valadares <ivan.valadares@xxxxxxxxxxx>]

<?php
// scrypt for backup and restore postgres database


function dl_file($file){
  if (!is_file($file)) { die("<b>404 File not found!</b>"); }
  $len = filesize($file);
  $filename = basename($file);
  $file_extension = strtolower(substr(strrchr($filename,"."),1));
  $ctype="application/force-download";
  header("Pragma: public");
  header("Expires: 0");
  header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
  header("Cache-Control: public");
  header("Content-Description: File Transfer");
  header("Content-Type: $ctype");
  $header="Content-Disposition: attachment; filename=".$filename.";";
  header($header );
  header("Content-Transfer-Encoding: binary");
  header("Content-Length: ".$len);
  @readfile($file);
  exit;
}



$action  = $_POST["actionButton"];
$ficheiro=$_FILES["path"]["name"];
switch ($action) {
   case "Import":
     $dbname = "teste"; //database name
     $dbconn = pg_pconnect("host=localhost port=5432 dbname=$dbname 
user=postgres password=rularv"); //connectionstring
     if (!$dbconn) {
       echo "Can't connect.\n";
       exit;
     }
     $back = fopen($ficheiro,"r");
     $contents = fread($back, filesize($ficheiro));
     $res = pg_query(utf8_encode($contents));
     echo "Upload Ok";
     fclose($back);
 break;
 case "Export":
 $dbname = "MiradouroTest"; //database name
 $dbconn = pg_pconnect("host=localhost port=5432 dbname=$dbname 
user=postgres password=rularv"); //connectionstring
 if (!$dbconn) {
   echo "Can't connect.\n";
 exit;
 }
 $back = fopen("$dbname.sql","w");
 $res = pg_query(" select relname as tablename
                   from pg_class where relkind in ('r')
                   and relname not like 'pg_%' and relname not like 
'sql_%' order by tablename");
 $str="";
 while($row = pg_fetch_row($res))
 {
   $table = $row[0];
   $str .= "\n--\n";
   $str .= "-- Estrutura da tabela '$table'";
   $str .= "\n--\n";
   $str .= "\nDROP TABLE $table CASCADE;";
   $str .= "\nCREATE TABLE $table (";
   $res2 = pg_query("
   SELECT  attnum,attname , typname , atttypmod-4 , attnotnull 
,atthasdef ,adsrc AS def
   FROM pg_attribute, pg_class, pg_type, pg_attrdef WHERE 
pg_class.oid=attrelid
   AND pg_type.oid=atttypid AND attnum>0 AND pg_class.oid=adrelid AND 
adnum=attnum
   AND atthasdef='t' AND lower(relname)='$table' UNION
   SELECT attnum,attname , typname , atttypmod-4 , attnotnull , 
atthasdef ,'' AS def
   FROM pg_attribute, pg_class, pg_type WHERE pg_class.oid=attrelid
   AND pg_type.oid=atttypid AND attnum>0 AND atthasdef='f' AND 
lower(relname)='$table' ");                                             
   while($r = pg_fetch_row($res2))
   {
   $str .= "\n" . $r[1]. " " . $r[2];
    if ($r[2]=="varchar")
   {
   $str .= "(".$r[3] .")";
   }
   if ($r[4]=="t")
   {
   $str .= " NOT NULL";
   }
   if ($r[5]=="t")
   {
   $str .= " DEFAULT ".$r[6];
   }
   $str .= ",";
   }
   $str=rtrim($str, ",");  
   $str .= "\n);\n";
   $str .= "\n--\n";
   $str .= "-- Creating data for '$table'";
   $str .= "\n--\n\n";

   
   $res3 = pg_query("SELECT * FROM $table");
   while($r = pg_fetch_row($res3))
   {
     $sql = "INSERT INTO $table VALUES ('";
     $sql .= utf8_decode(implode("','",$r));
     $sql .= "');";
     $str = str_replace("''","NULL",$str);
     $str .= $sql;  
     $str .= "\n";
   }
   
    $res1 = pg_query("SELECT pg_index.indisprimary,
           pg_catalog.pg_get_indexdef(pg_index.indexrelid)
       FROM pg_catalog.pg_class c, pg_catalog.pg_class c2,
           pg_catalog.pg_index AS pg_index
       WHERE c.relname = '$table'
           AND c.oid = pg_index.indrelid
           AND pg_index.indexrelid = c2.oid
           AND pg_index.indisprimary");
   while($r = pg_fetch_row($res1))
   {
   $str .= "\n\n--\n";
   $str .= "-- Creating index for '$table'";
   $str .= "\n--\n\n";
   $t = str_replace("CREATE UNIQUE INDEX", "", $r[1]);
   $t = str_replace("USING btree", "|", $t);
   // Next Line Can be improved!!!
   $t = str_replace("ON", "|", $t);
   $Temparray = explode("|", $t);
   $str .= "ALTER TABLE ONLY ". $Temparray[1] . " ADD CONSTRAINT " . 
$Temparray[0] . " PRIMARY KEY " . $Temparray[2] .";\n";
   }   
 }
 $res = pg_query(" SELECT
 cl.relname AS tabela,ct.conname,
  pg_get_constraintdef(ct.oid)
  FROM pg_catalog.pg_attribute a
  JOIN pg_catalog.pg_class cl ON (a.attrelid = cl.oid AND cl.relkind = 'r')
  JOIN pg_catalog.pg_namespace n ON (n.oid = cl.relnamespace)
  JOIN pg_catalog.pg_constraint ct ON (a.attrelid = ct.conrelid AND
  ct.confrelid != 0 AND ct.conkey[1] = a.attnum)
  JOIN pg_catalog.pg_class clf ON (ct.confrelid = clf.oid AND 
clf.relkind = 'r')
  JOIN pg_catalog.pg_namespace nf ON (nf.oid = clf.relnamespace)
  JOIN pg_catalog.pg_attribute af ON (af.attrelid = ct.confrelid AND
  af.attnum = ct.confkey[1]) order by cl.relname ");
 while($row = pg_fetch_row($res))
 {
   $str .= "\n\n--\n";
   $str .= "-- Creating relacionships for '".$row[0]."'";
   $str .= "\n--\n\n";
   $str .= "ALTER TABLE ONLY ".$row[0] . " ADD CONSTRAINT " . $row[1] . 
" " . $row[2] . ";";
 }       
 fwrite($back,$str);
 fclose($back);
 dl_file("$dbname.sql");
 break;
}

?>

<html>
<head>
</head>
<body>
<form id="dataForm" name="dataForm" method="post" 
enctype="multipart/form-data" action="">
   <input type="file" name="path" id="path" style="width:300px"/>
   <input type="submit" value="Import" name="actionButton" 
id="actionButton" >
   <input type="submit" value="Export" name="actionButton" 
id="actionButton" >
</form>
</body>
</html>