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<?php
/**
* Lightweight abstraction layer for common simple database routines
*
* Standard: PSR-2
* @link http://www.php-fig.org/psr/psr-2 Full Documentation
*
* @package SC\DUPX\DB
*
*/
class DUPX_DB
{
/**
* MySQL connection wrapper with support for port
*
* @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
* @param int $port The server DB port
*
* @return database connection handle
*/
public static function connect($host, $username, $password, $dbname = '', $port = null)
{
//sock connections
if ('sock' === substr($host, -4)) {
$url_parts = parse_url($host);
$dbh = @mysqli_connect('localhost', $username, $password, $dbname, null, $url_parts['path']);
} else {
$dbh = @mysqli_connect($host, $username, $password, $dbname, $port);
}
return $dbh;
}
/**
* 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 = '{$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 `$name`");
if ($total) {
$total = @mysqli_fetch_array($total);
return $total[0];
} else {
return 0;
}
}
/**
* 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 '{$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'));
}
$version = is_null($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 $dbh Database connection handle
*
* @return string The full details of mysql
*/
public static function getServerInfo($dbh)
{
return mysqli_get_server_info($dbh);
}
/**
* Get an array of all supported collation names
*
* @param conn $dbh Database connection handle
*
* @return array
*/
public static function getSupportedCollationsList($dbh)
{
$collations = array();
$query = "SHOW COLLATION";
if ($result = $dbh->query($query)) {
while ($row = $result->fetch_assoc()) {
$collations[] = $row["Collation"];
}
}
$result->free();
return $collations;
}
/**
* 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;
}
/**
* 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 $collate The collation (optional)
*
* @return bool True on success
*/
public static function setCharset($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')) {
return mysqli_set_charset($dbh, $charset);
} else {
$sql = " SET NAMES {$charset}";
if (!empty($collate)) $sql .= " COLLATE {$collate}";
return mysqli_query($dbh, $sql);
}
}
}
}
?>