C:/drupal/includes/database.mysql.inc

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<?php
// $Id: database.mysql.inc,v 1.91 2008/04/14 17:48:33 dries Exp $

// Include functions shared between mysql and mysqli.
require_once './includes/database.mysql-common.inc';

function db_status_report($phase) {
  $t = get_t();

  $version = db_version();

  $form['mysql'] = array(
    'title' => $t('MySQL database'),
    'value' => ($phase == 'runtime') ? l($version, 'admin/reports/status/sql') : $version,
  );

  if (version_compare($version, DRUPAL_MINIMUM_MYSQL) < 0) {
    $form['mysql']['severity'] = REQUIREMENT_ERROR;
    $form['mysql']['description'] = $t('Your MySQL Server is too old. Drupal requires at least MySQL %version.', array('%version' => DRUPAL_MINIMUM_MYSQL));
  }

  return $form;
}

function db_version() {
  list($version) = explode('-', mysql_get_server_info());
  return $version;
}

function db_connect(a>) {
  a> = parse_url(a>);

  // Check if MySQL support is present in PHP
  if (!function_exists('mysql_connect')) {
    _db_error_page('Unable to use the MySQL database because the MySQL extension for PHP is not installed. Check your <code>php.ini</code> to see how you can enable it.');
  }

  // Decode url-encoded information in the db connection string
  a>['user'] = urldecode(a>['user']);
  // Test if database url has a password.
  a>['pass'] = isset(a>['pass']) ? urldecode(a>['pass']) : '';
  a>['host'] = urldecode(a>['host']);
  a>['path'] = urldecode(a>['path']);

  // Allow for non-standard MySQL port.
  if (isset(a>['port'])) {
    a>['host'] = a>['host'] . ':' . a>['port'];
  }

  // - TRUE makes mysql_connect() always open a new link, even if
  //   mysql_connect() was called before with the same parameters.
  //   This is important if you are using two databases on the same
  //   server.
  // - 2 means CLIENT_FOUND_ROWS: return the number of found
  //   (matched) rows, not the number of affected rows.
  $connection = @mysql_connect(a>['host'], a>['user'], a>['pass'], TRUE, 2);
  if (!$connection || !mysql_select_db(substr(a>['path'], 1))) {
    // Show error screen otherwise
    _db_error_page(mysql_error());
  }
  // Require ANSI mode to improve SQL portability.
  mysql_query("SET SESSION sql_mode='ANSI'", $connection);
  // Force UTF-8.
  mysql_query('SET NAMES "utf8"', $connection);
  return $connection;
}

function _db_query($query, $debug = 0) {
  global $active_db, $queries, $user;

  if (variable_get('dev_query', 0)) {
    list($usec, $sec) = explode(' ', microtime());
    $timer = (float)$usec + (float)$sec;
    // If devel.module query logging is enabled, prepend a comment with the username and calling function
    // to the SQL string. This is useful when running mysql's SHOW PROCESSLIST to learn what exact
    // code is issueing the slow query.
    $bt = debug_backtrace();
    // t() may not be available yet so we don't wrap 'Anonymous'.
    $name = $user->uid ? $user->name : variable_get('anonymous', 'Anonymous');
    // str_replace() to prevent SQL injection via username or anonymous name.
    $name = str_replace(array('*', '/'), '', $name);
    $query = '/* ' . $name . ' : ' . $bt[2]['function'] . ' */ ' . $query;
  }

  $result = mysql_query($query, $active_db);

  if (variable_get('dev_query', 0)) {
    $query = $bt[2]['function'] . "\n" . $query;
    list($usec, $sec) = explode(' ', microtime());
    $stop = (float)$usec + (float)$sec;
    $diff = $stop - $timer;
    $queries[] = array($query, $diff);
  }

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

  if (!mysql_errno($active_db)) {
    return $result;
  }
  else {
    // Indicate to drupal_error_handler that this is a database error.
    ${DB_ERROR} = TRUE;
    trigger_error(check_plain(mysql_error($active_db) . "\nquery: " . $query), E_USER_WARNING);
    return FALSE;
  }
}

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_result($result) {
  if ($result && mysql_num_rows($result) > 0) {
    // The mysql_fetch_row function has an optional second parameter $row
    // but that can't be used for compatibility with Oracle, DB2, etc.
    $array = mysql_fetch_row($result);
    return $array[0];
  }
  return FALSE;
}

function db_error() {
  global $active_db;
  return mysql_errno($active_db);
}

function db_affected_rows() {
  global $active_db;
  return mysql_affected_rows($active_db);
}

function db_query_range($query) {
  $args = func_get_args();
  $count = array_pop($args);
  $from = array_pop($args);
  array_shift($args);

  $query = db_prefix_tables($query);
  if (isset($args[0]) and is_array($args[0])) { // 'All arguments in one array' syntax
    $args = $args[0];
  }
  _db_query_callback($args, TRUE);
  $query = preg_replace_callback(DB_QUERY_REGEXP, '_db_query_callback', $query);
  $query .= ' LIMIT ' . (int)$from . ', ' . (int)$count;
  return _db_query($query);
}

function db_query_temporary($query) {
  $args = func_get_args();
  $tablename = array_pop($args);
  array_shift($args);

  $query = preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE ' . $tablename . ' Engine=HEAP SELECT', db_prefix_tables($query));
  if (isset($args[0]) and is_array($args[0])) { // 'All arguments in one array' syntax
    $args = $args[0];
  }
  _db_query_callback($args, TRUE);
  $query = preg_replace_callback(DB_QUERY_REGEXP, '_db_query_callback', $query);
  return _db_query($query);
}

function db_encode_blob($data) {
  global $active_db;
  return "'" . mysql_real_escape_string($data, $active_db) . "'";
}

function db_decode_blob($data) {
  return $data;
}

function db_escape_string($text) {
  global $active_db;
  return mysql_real_escape_string($text, $active_db);
}

function db_lock_table($table) {
  db_query('LOCK TABLES {' . db_escape_table($table) . '} WRITE');
}

function db_unlock_tables() {
  db_query('UNLOCK TABLES');
}

function db_table_exists($table) {
  return (bool) db_fetch_object(db_query("SHOW TABLES LIKE '{" . db_escape_table($table) . "}'"));
}

function db_column_exists($table, $column) {
  return (bool) db_fetch_object(db_query("SHOW COLUMNS FROM {" . db_escape_table($table) . "} LIKE '" . db_escape_table($column) . "'"));
}

function db_distinct_field($table, $field, $query) {
  $field_to_select = 'DISTINCT(' . $table . '.' . $field . ')';
  // (?<!text) is a negative look-behind (no need to rewrite queries that already use DISTINCT).
  return preg_replace('/(SELECT.*)(?:' . $table . '\.|\s)(?<!DISTINCT\()(?<!DISTINCT\(' . $table . '\.)' . $field . '(.*FROM )/AUsi', '\1 ' . $field_to_select . '\2', $query);
}

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