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<?php
/**
* Lightweight abstraction layer for common simple database routines
*
* Standard: PSR-2
*
* @package SC\DUPX\DB
* @link http://www.php-fig.org/psr/psr-2/
*
*/
defined('ABSPATH') || defined('DUPXABSPATH') || exit;
class DUPX_DB
{
/**
* Modified version of https://developer.wordpress.org/reference/classes/wpdb/db_connect/
*
* @param string $host The server host name
* @param string $username The server DB user name
* @param string $password The server DB password
* @param string $dbname The server DB name
* @return mysqli Database connection handle
*/
public static function connect($host, $username, $password, $dbname = null)
{
$dbh = null;
try {
$port = null;
$socket = null;
$is_ipv6 = false;
$host_data = self::parseDBHost($host);
if ($host_data) {
list($host, $port, $socket, $is_ipv6) = $host_data;
}
/*
* If using the `mysqlnd` library, the IPv6 address needs to be
* enclosed in square brackets, whereas it doesn't while using the
* `libmysqlclient` library.
* @see https://bugs.php.net/bug.php?id=67563
*/
if ($is_ipv6 && extension_loaded('mysqlnd')) {
$host = "[$host]";
}
$dbh = @mysqli_connect($host, $username, $password, $dbname, $port, $socket);
if (!$dbh) {
DUPX_Log::info('DATABASE CONNECTION ERROR: '.mysqli_connect_error().'[ERRNO:'.mysqli_connect_errno().']');
} else {
if (method_exists($dbh, 'options')) {
$dbh->options(MYSQLI_OPT_LOCAL_INFILE, false);
}
}
}
catch (Exception $e) {
DUPX_Log::info('DATABASE CONNECTION EXCEPTION ERROR: '.$e->getMessage());
}
return $dbh;
}
/**
* Modified version of https://developer.wordpress.org/reference/classes/wpdb/parse_db_host/
*
* @param string $host The DB_HOST setting to parse
* @return array|bool Array containing the host, the port, the socket and whether it is an IPv6 address, in that order. If $host couldn't be parsed, returns false
*/
public static function parseDBHost($host)
{
$port = null;
$socket = null;
$is_ipv6 = false;
// First peel off the socket parameter from the right, if it exists.
$socket_pos = strpos($host, ':/');
if (false !== $socket_pos) {
$socket = substr($host, $socket_pos + 1);
$host = substr($host, 0, $socket_pos);
}
// We need to check for an IPv6 address first.
// An IPv6 address will always contain at least two colons.
if (substr_count($host, ':') > 1) {
$pattern = '#^(?:\[)?(?P<host>[0-9a-fA-F:]+)(?:\]:(?P<port>[\d]+))?#';
$is_ipv6 = true;
} else {
// We seem to be dealing with an IPv4 address.
$pattern = '#^(?P<host>[^:/]*)(?::(?P<port>[\d]+))?#';
}
$matches = array();
$result = preg_match($pattern, $host, $matches);
if (1 !== $result) {
// Couldn't parse the address, bail.
return false;
}
$host = '';
foreach (array('host', 'port') as $component) {
if (!empty($matches[$component])) {
$$component = $matches[$component];
}
}
return array($host, $port, $socket, $is_ipv6);
}
/**
* Count the tables in a given database
*
* @param obj $dbh A valid database link handle
* @param string $dbname Database to count tables in
*
* @return int The number of tables in the database
*/
public static function countTables($dbh, $dbname)
{
$res = mysqli_query($dbh, "SELECT COUNT(*) AS count FROM information_schema.tables WHERE table_schema = '".mysqli_real_escape_string($dbh, $dbname)."' ");
$row = mysqli_fetch_row($res);
return is_null($row) ? 0 : $row[0];
}
/**
* Returns the number of rows in a table
*
* @param obj $dbh A valid database link handle
* @param string $name A valid table name
*/
public static function countTableRows($dbh, $name)
{
$total = mysqli_query($dbh, "SELECT COUNT(*) FROM `".mysqli_real_escape_string($dbh, $name)."`");
if ($total) {
$total = @mysqli_fetch_array($total);
return $total[0];
} else {
return 0;
}
}
/**
* Drops the table given
*
* @param obj $dbh A valid database link handle
* @param string $name A valid table name to remove
*
* @return null
*/
public static function dropTable($dbh, $name)
{
self::queryNoReturn($dbh, "DROP TABLE IF EXISTS $name");
}
/**
* Validates if the $collations exist in the current database
*
* @param obj $dbh A valid database link handle
* @param array $collations An array of collation names to search on
*
* @return array Returns the original $collations array with the original names and a found status
* $status[name], $status[found]
*/
public static function getCollationStatus($dbh, $collations)
{
$localhost = array();
$status = array();
$query = "SHOW COLLATION";
if ($result = $dbh->query($query)) {
while ($row = $result->fetch_assoc()) {
$localhost[] = $row["Collation"];
}
if (DUPX_U::isTraversable($collations)) {
foreach ($collations as $key => $val) {
$status[$key]['name'] = $val;
$status[$key]['found'] = (in_array($val, $localhost)) ? 1 : 0;
}
}
}
$result->free();
return $status;
}
/**
* Returns the database names as an array
*
* @param obj $dbh A valid database link handle
* @param string $dbuser An optional dbuser name to search by
*
* @return array A list of all database names
*/
public static function getDatabases($dbh, $dbuser = '')
{
$sql = strlen($dbuser) ? "SHOW DATABASES LIKE '%".mysqli_real_escape_string($dbh, $dbuser)."%'" : 'SHOW DATABASES';
$query = @mysqli_query($dbh, $sql);
if ($query) {
while ($db = @mysqli_fetch_array($query)) {
$all_dbs[] = $db[0];
}
if (isset($all_dbs) && is_array($all_dbs)) {
return $all_dbs;
}
}
return array();
}
/**
* Returns the tables for a database as an array
*
* @param obj $dbh A valid database link handle
*
* @return array A list of all table names
*/
public static function getTables($dbh)
{
$query = @mysqli_query($dbh, 'SHOW TABLES');
if ($query) {
while ($table = @mysqli_fetch_array($query)) {
$all_tables[] = $table[0];
}
if (isset($all_tables) && is_array($all_tables)) {
return $all_tables;
}
}
return array();
}
/**
* Get the requested MySQL system variable
*
* @param obj $dbh A valid database link handle
* @param string $name The database variable name to lookup
*
* @return string the server variable to query for
*/
public static function getVariable($dbh, $name)
{
$result = @mysqli_query($dbh, "SHOW VARIABLES LIKE '".mysqli_real_escape_string($dbh, $name)."'");
$row = @mysqli_fetch_array($result);
@mysqli_free_result($result);
return isset($row[1]) ? $row[1] : null;
}
/**
* Gets the MySQL database version number
*
* @param obj $dbh A valid database link handle
* @param bool $full True: Gets the full version
* False: Gets only the numeric portion i.e. 5.5.6 or 10.1.2 (for MariaDB)
*
* @return false|string 0 on failure, version number on success
*/
public static function getVersion($dbh, $full = false)
{
if ($full) {
$version = self::getVariable($dbh, 'version');
} else {
$version = preg_replace('/[^0-9.].*/', '', self::getVariable($dbh, 'version'));
}
//Fall-back for servers that have restricted SQL for SHOW statement
//Note: For MariaDB this will report something like 5.5.5 when it is really 10.2.1.
//This mainly is due to mysqli_get_server_info method which gets the version comment
//and uses a regex vs getting just the int version of the value. So while the former
//code above is much more accurate it may fail in rare situations
if (empty($version)) {
$version = mysqli_get_server_info($dbh);
$version = preg_replace('/[^0-9.].*/', '', $version);
}
$version = is_null($version) ? null : $version;
return empty($version) ? 0 : $version;
}
/**
* Returns a more detailed string about the msyql server version
* For example on some systems the result is 5.5.5-10.1.21-MariaDB
* this format is helpful for providing the user a full overview
*
* @param conn $dbh Database connection handle
*
* @return string The full details of mysql
*/
public static function getInfo($dbh)
{
return mysqli_get_server_info($dbh);
}
/**
* Determine if a MySQL database supports a particular feature
*
* @param conn $dbh Database connection handle
* @param string $feature the feature to check for
* @return bool
*/
public static function hasAbility($dbh, $feature)
{
$version = self::getVersion($dbh);
switch (strtolower($feature)) {
case 'collation' :
case 'group_concat' :
case 'subqueries' :
return version_compare($version, '4.1', '>=');
case 'set_charset' :
return version_compare($version, '5.0.7', '>=');
}
return false;
}
/**
* Runs a query and returns the results as an array with the column names
*
* @param obj $dbh A valid database link handle
* @param string $sql The sql to run
*
* @return array The result of the query as an array with the column name as the key
*/
public static function queryColumnToArray($dbh, $sql, $column_index = 0)
{
$result_array = array();
$full_result_array = self::queryToArray($dbh, $sql);
for ($i = 0; $i < count($full_result_array); $i++) {
$result_array[] = $full_result_array[$i][$column_index];
}
return $result_array;
}
/**
* Runs a query with no result
*
* @param obj $dbh A valid database link handle
* @param string $sql The sql to run
*
* @return array The result of the query as an array
*/
public static function queryToArray($dbh, $sql)
{
$result = array();
DUPX_Log::info("calling mysqli query on $sql", DUPX_Log::LV_HARD_DEBUG);
$query_result = mysqli_query($dbh, $sql);
if ($query_result !== false) {
if (mysqli_num_rows($query_result) > 0) {
while ($row = mysqli_fetch_row($query_result)) {
$result[] = $row;
}
}
} else {
$error = mysqli_error($dbh);
throw new Exception("Error executing query {$sql}.<br/>{$error}");
}
return $result;
}
/**
* Runs a query with no result
*
* @param obj $dbh A valid database link handle
* @param string $sql The sql to run
*
* @return null
*/
public static function queryNoReturn($dbh, $sql)
{
$query_result = mysqli_query($dbh, $sql);
if ($query_result === false) {
$error = mysqli_error($dbh);
throw new Exception("Error executing query {$sql}.<br/>{$error}");
}
}
/**
* Renames an existing table
*
* @param obj $dbh A valid database link handle
* @param string $existing_name The current tables name
* @param string $new_name The new table name to replace the existing name
* @param string $delete_if_conflict Delete the table name if there is a conflict
*
* @return null
*/
public static function renameTable($dbh, $existing_name, $new_name, $delete_if_conflict = false)
{
if ($delete_if_conflict) {
if (self::tableExists($dbh, $new_name)) {
self::dropTable($dbh, $new_name);
}
}
self::queryNoReturn($dbh, "RENAME TABLE $existing_name TO $new_name");
}
/**
* Sets the MySQL connection's character set.
*
* @param resource $dbh The resource given by mysqli_connect
* @param string $charset The character set (optional)
* @param string $collate The collation (optional)
*/
public static function setCharset($dbh, $charset = null, $collate = null)
{
$charset = (!isset($charset) ) ? $GLOBALS['DBCHARSET_DEFAULT'] : $charset;
$collate = (!isset($collate) ) ? $GLOBALS['DBCOLLATE_DEFAULT'] : $collate;
if (self::hasAbility($dbh, 'collation') && !empty($charset)) {
if (function_exists('mysqli_set_charset') && self::hasAbility($dbh, 'set_charset')) {
if (($result = mysqli_set_charset($dbh, mysqli_real_escape_string($dbh, $charset))) === false) {
$errMsg = mysqli_error($dbh);
DUPX_Log::info('DATABASE ERROR: mysqli_set_charset '.DUPX_Log::varToString($charset).' MSG: '.$errMsg);
} else {
DUPX_Log::info('DATABASE: mysqli_set_charset '.DUPX_Log::varToString($charset), DUPX_Log::LV_DETAILED);
}
return $result;
} else {
$sql = " SET NAMES ".mysqli_real_escape_string($dbh, $charset);
if (!empty($collate)) {
$sql .= " COLLATE ".mysqli_real_escape_string($dbh, $collate);
}
if (($result = mysqli_query($dbh, $sql)) === false) {
$errMsg = mysqli_error($dbh);
DUPX_Log::info('DATABASE SQL ERROR: '.DUPX_Log::varToString($sql).' MSG: '.$errMsg);
} else {
DUPX_Log::info('DATABASE SQL: '.DUPX_Log::varToString($sql), DUPX_Log::LV_DETAILED);
}
return $result;
}
}
}
/**
* If cached_table_names is null re-query the database, otherwise use those for the list
*
* @param obj $dbh A valid database link handle
* @param string $table_name Name of table to check for
*
* @return bool Does the table name exist in the database
*/
public static function tableExists($dbh, $table_name, $cached_table_names = null)
{
if ($cached_table_names === null) {
// RSR TODO: retrieve full list of tables
$cached_table_names = self::queryColumnToArray($dbh, "SHOW TABLES");
}
return in_array($table_name, $cached_table_names);
}
/**
* mysqli_query wrapper with logging
*
* @param mysqli $link
* @param string $sql
* @return type
*/
public static function mysqli_query($link, $sql, $file = '', $line = '')
{
if (($result = mysqli_query($link, $sql)) === false) {
DUPX_Log::info('DB QUERY [ERROR]['.$file.':'.$line.'] SQL: '.DUPX_Log::varToString($sql)."\n\t MSG: ".mysqli_error($link));
} else {
DUPX_Log::info('DB QUERY ['.$file.':'.$line.']: '.DUPX_Log::varToString($sql), DUPX_Log::LV_HARD_DEBUG);
}
return $result;
}
}