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<?php
// $Id: database.mysqli.inc,v 1.54 2008/01/23 09:59:29 goba Exp $
/**
* @file
* Database interface code for MySQL database servers using the mysqli client libraries. mysqli is included in PHP 5 by default and allows developers to use the advanced features of MySQL 4.1.x, 5.0.x and beyond.
*/
// Maintainers of this file should consult:
// http://www.php.net/manual/en/ref.mysqli.php
/**
* @ingroup database
* @{
*/
// Include functions shared between mysql and mysqli.
require_once './includes/database.mysql-common.inc';
/**
* Report database status.
*/
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;
}
/**
* Returns the version of the database server currently in use.
*
* @return Database server version
*/
function db_version() {
global $active_db;
list($version) = explode('-', mysqli_get_server_info($active_db));
return $version;
}
/**
* Initialise a database connection.
*
* Note that mysqli does not support persistent connections.
*/
function db_connect($url) {
// Check if MySQLi support is present in PHP
if (!function_exists('mysqli_init') && !extension_loaded('mysqli')) {
_db_error_page('Unable to use the MySQLi database because the MySQLi extension for PHP is not installed. Check your <code>php.ini</code> to see how you can enable it.');
}
$url = parse_url($url);
// Decode url-encoded information in the db connection string
$url['user'] = urldecode($url['user']);
// Test if database url has a password.
$url['pass'] = isset($url['pass']) ? urldecode($url['pass']) : '';
$url['host'] = urldecode($url['host']);
$url['path'] = urldecode($url['path']);
if (!isset($url['port'])) {
$url['port'] = NULL;
}
$connection = mysqli_init();
@mysqli_real_connect($connection, $url['host'], $url['user'], $url['pass'], substr($url['path'], 1), $url['port'], NULL, MYSQLI_CLIENT_FOUND_ROWS);
if (mysqli_connect_errno() > 0) {
_db_error_page(mysqli_connect_error());
}
// Force UTF-8.
mysqli_query($connection, 'SET NAMES "utf8"');
return $connection;
}
/**
* Helper function for db_query().
*/
function _db_query($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;
}
$result = mysqli_query($active_db, $query);
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: '. $query .'<br />error:'. mysqli_error($active_db) .'</p>';
}
if (!mysqli_errno($active_db)) {
return $result;
}
else {
// Indicate to drupal_error_handler that this is a database error.
${DB_ERROR} = TRUE;
trigger_error(check_plain(mysqli_error($active_db) ."\nquery: ". $query), E_USER_WARNING);
return FALSE;
}
}
/**
* Fetch one result row from the previous query as an object.
*
* @param $result
* A database query result resource, as returned from db_query().
* @return
* An object representing the next row of the result, or FALSE. The attributes
* of this object are the table fields selected by the query.
*/
function db_fetch_object($result) {
if ($result) {
$object = mysqli_fetch_object($result);
return isset($object) ? $object : FALSE;
}
}
/**
* Fetch one result row from the previous query as an array.
*
* @param $result
* A database query result resource, as returned from db_query().
* @return
* An associative array representing the next row of the result, or FALSE.
* The keys of this object are the names of the table fields selected by the
* query, and the values are the field values for this result row.
*/
function db_fetch_array($result) {
if ($result) {
$array = mysqli_fetch_array($result, MYSQLI_ASSOC);
return isset($array) ? $array : FALSE;
}
}
/**
* Return an individual result field from the previous query.
*
* Only use this function if exactly one field is being selected; otherwise,
* use db_fetch_object() or db_fetch_array().
*
* @param $result
* A database query result resource, as returned from db_query().
* @return
* The resulting field or FALSE.
*/
function db_result($result) {
if ($result && mysqli_num_rows($result) > 0) {
// The mysqli_fetch_row function has an optional second parameter $row
// but that can't be used for compatibility with Oracle, DB2, etc.
$array = mysqli_fetch_row($result);
return $array[0];
}
return FALSE;
}
/**
* Determine whether the previous query caused an error.
*/
function db_error() {
global $active_db;
return mysqli_errno($active_db);
}
/**
* Determine the number of rows changed by the preceding query.
*/
function db_affected_rows() {
global $active_db; /* mysqli connection resource */
return mysqli_affected_rows($active_db);
}
/**
* Runs a limited-range query in the active database.
*
* Use this as a substitute for db_query() when a subset of the query is to be
* returned.
* User-supplied arguments to the query should be passed in as separate parameters
* so that they can be properly escaped to avoid SQL injection attacks.
*
* @param $query
* A string containing an SQL query.
* @param ...
* A variable number of arguments which are substituted into the query
* using printf() syntax. The query arguments can be enclosed in one
* array instead.
* Valid %-modifiers are: %s, %d, %f, %b (binary data, do not enclose
* in '') and %%.
*
* NOTE: using this syntax will cast NULL and FALSE values to decimal 0,
* and TRUE values to decimal 1.
*
* @param $from
* The first result row to return.
* @param $count
* The maximum number of result rows to return.
* @return
* A database query result resource, or FALSE if the query was not executed
* correctly.
*/
function db_query_range($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);
}
/**
* Runs a SELECT query and stores its results in a temporary table.
*
* Use this as a substitute for db_query() when the results need to stored
* in a temporary table. Temporary tables exist for the duration of the page
* request.
* User-supplied arguments to the query should be passed in as separate parameters
* so that they can be properly escaped to avoid SQL injection attacks.
*
* Note that if you need to know how many results were returned, you should do
* a SELECT COUNT(*) on the temporary table afterwards. db_affected_rows() does
* not give consistent result across different database types in this case.
*
* @param $query
* A string containing a normal SELECT SQL query.
* @param ...
* A variable number of arguments which are substituted into the query
* using printf() syntax. The query arguments can be enclosed in one
* array instead.
* Valid %-modifiers are: %s, %d, %f, %b (binary data, do not enclose
* in '') and %%.
*
* NOTE: using this syntax will cast NULL and FALSE values to decimal 0,
* and TRUE values to decimal 1.
*
* @param $table
* The name of the temporary table to select into. This name will not be
* prefixed as there is no risk of collision.
* @return
* A database query result resource, or FALSE if the query was not executed
* correctly.
*/
function db_query_temporary($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);
}
/**
* Returns a properly formatted Binary Large Object value.
*
* @param $data
* Data to encode.
* @return
* Encoded data.
*/
function db_encode_blob($data) {
global $active_db;
return "'". mysqli_real_escape_string($active_db, $data) ."'";
}
/**
* Returns text from a Binary Large OBject value.
*
* @param $data
* Data to decode.
* @return
* Decoded data.
*/
function db_decode_blob($data) {
return $data;
}
/**
* Prepare user input for use in a database query, preventing SQL injection attacks.
*/
function db_escape_string($text) {
global $active_db;
return mysqli_real_escape_string($active_db, $text);
}
/**
* Lock a table.
*/
function db_lock_table($table) {
db_query('LOCK TABLES {'. db_escape_table($table) .'} WRITE');
}
/**
* Unlock all locked tables.
*/
function db_unlock_tables() {
db_query('UNLOCK TABLES');
}
/**
* Check if a table exists.
*/
function db_table_exists($table) {
return (bool) db_fetch_object(db_query("SHOW TABLES LIKE '{". db_escape_table($table) ."}'"));
}
/**
* Check if a column exists in the given table.
*/
function db_column_exists($table, $column) {
return (bool) db_fetch_object(db_query("SHOW COLUMNS FROM {". db_escape_table($table) ."} LIKE '". db_escape_table($column) ."'"));
}
/**
* Wraps the given table.field entry with a DISTINCT(). The wrapper is added to
* the SELECT list entry of the given query and the resulting query is returned.
* This function only applies the wrapper if a DISTINCT doesn't already exist in
* the query.
*
* @param $table Table containing the field to set as DISTINCT
* @param $field Field to set as DISTINCT
* @param $query Query to apply the wrapper to
* @return SQL query with the DISTINCT wrapper surrounding the given table.field.
*/
function db_distinct_field($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);
}
/**
* @} End of "ingroup database".
*/
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