Saturday 27 June 2015

A few MySQL functions for PHP


MySQL: Connect 

/*--------------------------------------------------------




 * Function: DBconnect




 * Skapar en anslutning till databas och tabellen vi arbetar mot




 * 




 * Parameters: 




 * database - Används inte




 * 




 * Returns:




 * Pekare till databasen eller en textsträng med felmeddelande




 * 




 * Usage:




 * $sqlid = DBconnect("");




 *------------------------------------------------------ */




function DBconnect($database) {




 




 # Anslut till mySQL




 $sqlid=@mysql_connect(DB_DATABASE, DB_USER, DB_PASSWORD);




 if ($sqlid=="") {




  print("<em>Det gick inte att få kontakt med databasen '".DB_DATABASE."'.</em>");




  exit;




 }




 




 # Välj tabell att hantera




 $tabell=@mysql_select_db(DB_TABLE);




 if ($tabell=="") {




  print("<em>Tabellen '".DB_TABLE."' finns inte i databasen.</em>");




  exit;




 }




  return $sqlid;




 }
MySQL: Escape characters 

# ---------------------------------------------------------




#  Escapes characters to be MySQL ready




# ---------------------------------------------------------




function escape($string) {




 $sqlid = DBconnect("");




 if(get_magic_quotes_gpc()) $string = stripslashes($string);




 return mysql_real_escape_string($string);




}
MySQL: Insert 

/*--------------------------------------------------------




 * Function: sql_insert($table, $data)




 *  Creates an SQL query for inserting data into a table * 




 *




 * Parameters: 




 *  $table -




 *  $data -




 * 




 * Returns:




 *  Escaped SQL query ready to de executed




 * 




 * Usage:




 *  $table = DB_TABLE;




 *  $data['created']=$datum;




 *  $sql = sql_insert($table, $data);




 *  $result = mysql_query($sql);




 *  if (!$result) { print(mysql_error()); }




 *------------------------------------------------------ */




function sql_insert($table, $data) {




 $q = "INSERT INTO `".$table."` (";




 




 # Skapa variabler för fältnamn och värden




 foreach($data as $key=>$val) {




  if(strtolower($val)=='null') {




   $f.= "`$key`, ";




   $v.= "NULL, ";




  } elseif(strtolower($val)=='now()') {




   $f.= "`$key`, ";




   $v.= "NOW(), ";




  } else {




   $f.= "`$key`, ";




   $v.= "'".escape($val)."', ";




  }




    }




 




 # Ta bort sista ", "




 $f = rtrim($f, ', ');  $v = rtrim($v, ', ');




 




 # Skapa hela SQL-satsen




 $q = $q.$f.") VALUES (".$v.")";




 




 return $q;




}
MySQL: Update 

/*--------------------------------------------------------




 * Function: sql_update($table, $data, $where='1')




 * Creates an SQL query for updating data in a table




 * 




 * Parameters: 




 *  $table -




 *  $data -




 *  $where -




 * 




 * Returns:




 *  Escaped SQL query ready to de executed




 * 




 * Usage:




 *  $table = DB_TABLE;




 *  $data['uppdaterad']=$datum;




 *  $where = "id=$myid";




 *  $sql = sql_update($table, $data, $where);




 *  $result = mysql_query($sql);




 *  if (!$result) { print(mysql_error()); }




 *------------------------------------------------------ */




function sql_update($table, $data, $where='1') {




 $q="UPDATE `".$table."` SET ";




 




 foreach($data as $key=>$val) {




  if(strtolower($val)=='null') $q.= "`$key`=NULL, ";




  elseif(strtolower($val)=='now()') $q.= "`$key`=NOW(), ";




  elseif (is_numeric($value)) $q.= "`$key`=".intval($value).", ";




  else $q.= "`$key`='".escape($val)."', ";




 }




 




 # Ta bort sista ", "




 $q = rtrim($q, ', ') . ' WHERE '.$where.';';




 




 return $q;




}

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