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<?php declare(strict_types=1); |
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require_once(CONFIG . 'SmrMySqlSecrets.inc'); |
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abstract class MySqlDatabase { |
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// add configuration static members via traits |
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use SmrMySqlSecrets; |
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protected static $dbConn; |
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protected static $selectedDbName; |
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protected $dbResult = null; |
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protected $dbRecord = null; |
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public function __construct($dbName) { |
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if (!self::$dbConn) { |
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// Set the mysqli driver to raise exceptions on errors |
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if (!mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT)) { |
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$this->error('Failed to enable mysqli error reporting'); |
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} |
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self::$dbConn = new mysqli(self::$host, self::$user, self::$password, |
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$dbName, self::$port, self::$socket); |
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self::$selectedDbName = $dbName; |
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// Default server charset should be set correctly. Using the default |
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// avoids the additional query involved in `set_charset`. |
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$charset = self::$dbConn->character_set_name(); |
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if ($charset != 'utf8') { |
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$this->error('Unexpected charset: ' . $charset); |
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} |
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} |
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// Do we need to switch databases (e.g. for compatability db access)? |
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if (self::$selectedDbName != $dbName) { |
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self::$dbConn->select_db($dbName); |
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self::$selectedDbName = $dbName; |
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} |
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} |
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/** |
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* Returns the size of the selected database in bytes. |
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*/ |
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public function getDbBytes() { |
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$query = 'SELECT SUM(data_length + index_length) as db_bytes FROM information_schema.tables WHERE table_schema=' . $this->escapeString(self::$selectedDbName); |
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$result = self::$dbConn->query($query); |
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return (int)$result->fetch_assoc()['db_bytes']; |
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} |
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// This should not be needed except perhaps by persistent connections |
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public function close() { |
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if (self::$dbConn) { |
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self::$dbConn->close(); |
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self::$dbConn = false; |
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} |
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} |
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public function query($query) { |
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$this->dbResult = self::$dbConn->query($query); |
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} |
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/** |
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* Use to populate this instance with the next record of the active query. |
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*/ |
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public function nextRecord() : bool { |
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if (!$this->dbResult) { |
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$this->error('No resource to get record from.'); |
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} |
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if ($this->dbRecord = $this->dbResult->fetch_assoc()) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Use instead of nextRecord when exactly one record is expected from the |
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* active query. |
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*/ |
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public function requireRecord() : void { |
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if (!$this->nextRecord() || $this->getNumRows() != 1) { |
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$this->error('One record required, but found ' . $this->getNumRows()); |
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} |
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} |
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public function hasField($name) { |
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return isset($this->dbRecord[$name]); |
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} |
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public function getField($name) { |
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return $this->dbRecord[$name]; |
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} |
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public function getBoolean($name) { |
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if ($this->dbRecord[$name] == 'TRUE') { |
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return true; |
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} |
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// if($this->dbRecord[$name] == 'FALSE') |
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return false; |
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// throw new Exception('Field is not a boolean'); |
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} |
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public function getInt($name) { |
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return (int)$this->dbRecord[$name]; |
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} |
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public function getFloat($name) { |
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return (float)$this->dbRecord[$name]; |
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} |
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// WARNING: In the past, Microtime was stored in the database incorrectly. |
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// For backwards compatibility, set $pad_msec=true to try to guess at the |
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// intended value. This is not safe if the Microtime length is wrong for an |
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// unrelated reason! |
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public function getMicrotime($name, $pad_msec = false) { |
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$data = $this->dbRecord[$name]; |
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$sec = substr($data, 0, 10); |
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$msec = substr($data, 10); |
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if (strlen($msec) != 6) { |
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if ($pad_msec) { |
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$msec = str_pad($msec, 6, '0', STR_PAD_LEFT); |
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} else { |
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throw new Exception('Field is not an escaped microtime (' . $data . ')'); |
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} |
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} |
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return "$sec.$msec"; |
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} |
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public function getObject($name, $compressed = false) { |
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$object = $this->getField($name); |
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if ($compressed === true) { |
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$object = gzuncompress($object); |
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} |
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return unserialize($object); |
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} |
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public function getRow() { |
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return $this->dbRecord; |
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} |
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public function lockTable($table) { |
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self::$dbConn->query('LOCK TABLES ' . $table . ' WRITE'); |
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} |
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public function unlock() { |
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self::$dbConn->query('UNLOCK TABLES'); |
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} |
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public function getNumRows() { |
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return $this->dbResult->num_rows; |
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} |
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public function getChangedRows() { |
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return self::$dbConn->affected_rows; |
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} |
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public function getInsertID() { |
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return self::$dbConn->insert_id; |
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} |
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protected function error($err) { |
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throw new Exception($err); |
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} |
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public function escape($escape, $autoQuotes = true, $quotes = true) { |
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if (is_bool($escape)) { |
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if ($autoQuotes) { |
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return $this->escapeBoolean($escape); |
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} else { |
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return $this->escapeBoolean($escape, $quotes); |
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} |
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} |
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if (is_numeric($escape)) { |
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return $this->escapeNumber($escape); |
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} |
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if (is_string($escape)) { |
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if ($autoQuotes) { |
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return $this->escapeString($escape); |
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} else { |
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return $this->escapeString($escape, $quotes); |
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} |
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} |
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if (is_array($escape)) { |
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return $this->escapeArray($escape, $autoQuotes, $quotes); |
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} |
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if (is_object($escape)) { |
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if ($autoQuotes) { |
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return $this->escapeObject($escape); |
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} else { |
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return $this->escapeObject($escape, $quotes); |
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} |
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} |
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} |
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public function escapeString($string, $quotes = true, $nullable = false) { |
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if ($nullable === true && ($string === null || $string === '')) { |
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return 'NULL'; |
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} |
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if ($string === true) { |
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$string = 'TRUE'; |
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} elseif ($string === false) { |
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$string = 'FALSE'; |
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} |
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if (is_array($string)) { |
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$escapedString = ''; |
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foreach ($string as $value) { |
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$escapedString .= $this->escapeString($value, $quotes) . ','; |
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} |
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return substr($escapedString, 0, -1); |
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} |
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if ($quotes) { |
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return '\'' . self::$dbConn->real_escape_string($string) . '\''; |
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} |
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return self::$dbConn->real_escape_string($string); |
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} |
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public function escapeBinary($binary) { |
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return '0x' . bin2hex($binary); |
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} |
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public function escapeArray(array $array, $autoQuotes = true, $quotes = true, $implodeString = ',', $escapeIndividually = true) { |
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$string = ''; |
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if ($escapeIndividually) { |
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foreach ($array as $value) { |
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if (is_array($value)) { |
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$string .= $this->escapeArray($value, $autoQuotes, $quotes, $implodeString, $escapeIndividually) . $implodeString; |
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} else { |
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$string .= $this->escape($value, $autoQuotes, $quotes) . $implodeString; |
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} |
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} |
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$string = substr($string, 0, -1); |
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} else { |
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$string = $this->escape(implode($implodeString, $array), $autoQuotes, $quotes); |
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} |
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return $string; |
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} |
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public function escapeNumber($num) { |
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// Numbers need not be quoted in MySQL queries, so if we know $num is |
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// numeric, we can simply return its value (no quoting or escaping). |
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if (is_numeric($num)) { |
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return $num; |
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} else { |
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throw new Exception('Not a number! (' . $num . ')'); |
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} |
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} |
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public function escapeMicrotime($microtime, $quotes = false) { |
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$sec_str = sprintf('%010d', $microtime); |
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$usec_str = sprintf('%06d', fmod($microtime, 1) * 1E6); |
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return $this->escapeString($sec_str . $usec_str, $quotes); |
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} |
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public function escapeBoolean($bool, $quotes = true) { |
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if ($bool === true) { |
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return $this->escapeString('TRUE', $quotes); |
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} elseif ($bool === false) { |
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return $this->escapeString('FALSE', $quotes); |
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} else { |
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throw new Exception('Not a boolean: ' . $bool); |
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} |
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} |
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public function escapeObject($object, $compress = false, $quotes = true, $nullable = false) { |
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if ($compress === true) { |
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return $this->escapeBinary(gzcompress(serialize($object))); |
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} |
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return $this->escapeString(serialize($object), $quotes, $nullable); |
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} |
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} |
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