drupal/includes/database.mysql.inc

<?php

function db_connect($url) {
  $url = parse_url($url);

  mysql_pconnect($url["host"], $url["user"], $url["pass"]) or die(mysql_error());
  mysql_select_db(substr($url["path"], 1)) or die ("unable to select database");

  // NOTE: we are using a persistent connection!
}

function db_query($query) {
  $args = func_get_args();
  if (count($args) > 1) {
    $args = array_map("check_query", $args);
    $args[0] = $query;
    return _db_query(call_user_func_array("sprintf", $args));
  } else {
    return _db_query($query);
  }
}

// debug version
function db_queryd($query) {
  $args = func_get_args();
  if (count($args) > 1) {
    $args = array_map("check_query", $args);
    $args[0] = $query;
    return _db_query(call_user_func_array("sprintf", $args), 1);
  } else {
    return _db_query($query, 1);
  }
}

// private
function _db_query($query, $debug = 0) {
  global $queries;

  if (variable_get("dev_query", 0)) {
    $queries[] = $query;
  }

  $result = mysql_query($query);

  if ($debug) {
    print "<p>query: $query<br />error:". mysql_error() ."</p>";
  }

  if (!mysql_errno()) {
    return $result;
  } else {
    trigger_error(mysql_error() ."\nquery: ". htmlspecialchars($query), E_USER_ERROR);
  }
}

function db_fetch_object($result) {
  if ($result) {
    return mysql_fetch_object($result);
  }
}

function db_fetch_array($result) {
  if ($result) {
    return mysql_fetch_array($result, MYSQL_ASSOC);
  }
}

function db_num_rows($result) {
  if ($result) {
    return mysql_num_rows($result);
  }
}

function db_result($result, $row = 0) {
  if ($result && mysql_num_rows($result) > $row) {
    return mysql_result($result, $row);
  }
}

function db_error() {
  return mysql_errno();
}

?>