Database::error() - Code Metrics - Inspection of "Merge pull request #1038 from hemberger/remove-glo..." - smrealms/smr - Measure and Improve Code Quality continuously with Scrutinizer

Failed Conditions

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by Dan

created 2021-04-11 23:38 UTC

Database::error() A

↳ Parent: Database

Complexity

Conditions	1
Paths	1

Size

Total Lines	2
Code Lines	1

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
eloc	1
nc	1
nop	1
dl	0
loc	2
rs	10
c	0
b	0
f	0

<?php declare(strict_types=1);

namespace Smr;

use mysqli;
use mysqli_result;
use RuntimeException;
use Smr\Container\DiContainer;
use Smr\DatabaseProperties;

class Database {
	private mysqli $dbConn;
	private DatabaseProperties $dbProperties;
	private string $selectedDbName;
	private bool|mysqli_result $dbResult;
	private ?array $dbRecord;

	public static function getInstance(): self {
		return DiContainer::make(self::class);
	}

	/**
	 * Reconnects to the MySQL database, and replaces the managed mysqli instance
	 * in the dependency injection container for future retrievals.
	 * @throws \DI\DependencyException
	 * @throws \DI\NotFoundException
	 */
	private static function reconnectMysql(): mysqli {
		$newMysqli = DiContainer::make(mysqli::class);
		DiContainer::getContainer()->set(mysqli::class, $newMysqli);
		return $newMysqli;
	}

	public static function mysqliFactory(DatabaseProperties $dbProperties): mysqli {
		if (!mysqli_report(MYSQLI_REPORT_ERROR|MYSQLI_REPORT_STRICT)) {
			throw new RuntimeException('Failed to enable mysqli error reporting');
		}
		$mysql = new mysqli(
			$dbProperties->getHost(),
			$dbProperties->getUser(),
			$dbProperties->getPassword(),
			$dbProperties->getDatabaseName());
		$charset = $mysql->character_set_name();
		if ($charset != 'utf8') {
			throw new RuntimeException('Unexpected charset: ' . $charset);
		}
		return $mysql;
	}

	/**
	 * Database constructor.
	 * Not intended to be constructed by hand. If you need an instance of Database,
	 * use Database::getInstance();
	 * @param ?mysqli $dbConn The mysqli instance (null if reconnect needed)
	 * @param DatabaseProperties $dbProperties The properties object that was used to construct the mysqli instance
	 */
	public function __construct(?mysqli $dbConn, DatabaseProperties $dbProperties) {
		if (is_null($dbConn)) {
			$dbConn = self::reconnectMysql();
		}
		$this->dbConn = $dbConn;
		$this->dbProperties = $dbProperties;
		$this->selectedDbName = $dbProperties->getDatabaseName();
	}

	/**
	 * This method will switch the connection to the specified database.
	 * Useful for switching back and forth between historical, and live databases.
	 *
	 * @param string $databaseName The name of the database to switch to
	 */
	public function switchDatabases(string $databaseName) {
		$this->dbConn->select_db($databaseName);
		$this->selectedDbName = $databaseName;
	}

	/**
	 * Switch back to the configured live database
	 */
	public function switchDatabaseToLive() {
		$this->switchDatabases($this->dbProperties->getDatabaseName());
	}

	/**
	 * Returns the size of the selected database in bytes.
	 */
	public function getDbBytes() {
		$query = 'SELECT SUM(data_length + index_length) as db_bytes FROM information_schema.tables WHERE table_schema=' . $this->escapeString($this->selectedDbName);
		$result = $this->dbConn->query($query);
		return (int)$result->fetch_assoc()['db_bytes'];
	}

	/**
	 * This should not be needed except perhaps by persistent connections
	 *
	 * Closes the connection to the MySQL database. After closing this connection,
	 * this instance is no longer valid, and will subsequently throw exceptions when
	 * attempting to perform database operations.
	 *
	 * You must call Database::getInstance() again to retrieve a valid instance that
	 * is reconnected to the database.
	 *
	 * @return bool Whether the underlying connection was closed by this call.
	 */
	public function close() : bool {
		if (!isset($this->dbConn)) {
			// Connection is already closed; nothing to do.
			return false;
		}
		$this->dbConn->close();
		unset($this->dbConn);
		// Set the mysqli instance in the dependency injection container to
		// null so that the Database constructor will reconnect the next time
		// it is called.
		DiContainer::getContainer()->set(mysqli::class, null);
		return true;
	}

	public function query($query) {
		$this->dbResult = $this->dbConn->query($query);
	}

	/**
	 * Use to populate this instance with the next record of the active query.
	 */
	public function nextRecord(): bool {
		if (empty($this->dbResult)) {
			$this->error('No resource to get record from.');
		}
		if ($this->dbRecord = $this->dbResult->fetch_assoc()) {
			return true;
		}
		return false;
	}

	/**
	 * Use instead of nextRecord when exactly one record is expected from the
	 * active query.
	 */
	public function requireRecord(): void {
		if (!$this->nextRecord() || $this->getNumRows() != 1) {
			$this->error('One record required, but found ' . $this->getNumRows());
		}
	}

	public function hasField($name) {
		return isset($this->dbRecord[$name]);
	}

	public function getField($name) {
		return $this->dbRecord[$name];
	}

	public function getBoolean(string $name) : bool {
		if ($this->dbRecord[$name] === 'TRUE') {
			return true;
		} elseif ($this->dbRecord[$name] === 'FALSE') {
			return false;
		}
		$this->error('Field is not a boolean: ' . $name);
	}

	public function getInt($name) {
		return (int)$this->dbRecord[$name];
	}

	public function getFloat($name) {
		return (float)$this->dbRecord[$name];
	}

	public function getMicrotime(string $name) : string {
		// All digits of precision are stored in a MySQL bigint
		$data = $this->dbRecord[$name];
		return sprintf('%f', $data / 1E6);
	}

	public function getObject($name, $compressed = false, $nullable = false) {
		$object = $this->getField($name);
		if ($nullable === true && $object === null) {
			return null;
		}
		if ($compressed === true) {
			$object = gzuncompress($object);
		}
		return unserialize($object);
	}

	public function getRow() {
		return $this->dbRecord;
	}

	public function lockTable($table) {
		$this->dbConn->query('LOCK TABLES ' . $table . ' WRITE');
	}

	public function unlock() {
		$this->dbConn->query('UNLOCK TABLES');
	}

	public function getNumRows() {
		return $this->dbResult->num_rows;
	}

	public function getChangedRows() {
		return $this->dbConn->affected_rows;
	}

	public function getInsertID() {
		return $this->dbConn->insert_id;
	}

	protected function error($err) {
		throw new RuntimeException($err);
	}

	public function escape($escape) {
		if (is_bool($escape)) {
			return $this->escapeBoolean($escape);
		}
		if (is_numeric($escape)) {
			return $this->escapeNumber($escape);
		}
		if (is_string($escape)) {
			return $this->escapeString($escape);
		}
		if (is_array($escape)) {
			return $this->escapeArray($escape);
		}
		if (is_object($escape)) {
			return $this->escapeObject($escape);
		}
	}

	public function escapeString(?string $string, bool $nullable = false) : string {
		if ($nullable === true && ($string === null || $string === '')) {
			return 'NULL';
		}
		return '\'' . $this->dbConn->real_escape_string($string) . '\'';
	}

	public function escapeBinary($binary) {
		return '0x' . bin2hex($binary);
	}

	/**
	 * Warning: If escaping a nested array, use escapeIndividually=true,
	 * but beware that the escaped array is flattened!
	 */
	public function escapeArray(array $array, string $delimiter = ',', bool $escapeIndividually = true) : string {
		if ($escapeIndividually) {
			$string = join($delimiter, array_map(function($item) { return $this->escape($item); }, $array));
		} else {
			$string = $this->escape(join($delimiter, $array));
		}
		return $string;
	}

	public function escapeNumber($num) {
		// Numbers need not be quoted in MySQL queries, so if we know $num is
		// numeric, we can simply return its value (no quoting or escaping).
		if (is_numeric($num)) {
			return $num;
		} else {
			$this->error('Not a number! (' . $num . ')');
		}
	}

	public function escapeMicrotime(float $microtime) : string {
		// Retain all digits of precision for storing in a MySQL bigint
		return sprintf('%d', $microtime * 1E6);
	}

	public function escapeBoolean(bool $bool) : string {
		// We store booleans as an enum
		if ($bool) {
			return '\'TRUE\'';
		} else {
			return '\'FALSE\'';
		}
	}

	public function escapeObject($object, bool $compress = false, bool $nullable = false) : string {
		if ($nullable === true && $object === null) {
			return 'NULL';
		}
		if ($compress === true) {
			return $this->escapeBinary(gzcompress(serialize($object)));
		}
		return $this->escapeString(serialize($object));
	}
}


1			<?php declare(strict_types=1);
2
3			namespace Smr;
4
5			use mysqli;
6			use mysqli_result;
7			use RuntimeException;
8			use Smr\Container\DiContainer;
9			use Smr\DatabaseProperties;
10
11			class Database {
12			private mysqli $dbConn;
13			private DatabaseProperties $dbProperties;
14			private string $selectedDbName;
15			private bool\|mysqli_result $dbResult;
16			private ?array $dbRecord;
17
18			public static function getInstance(): self {
19			return DiContainer::make(self::class);
20			}
21
22			/**
23			* Reconnects to the MySQL database, and replaces the managed mysqli instance
24			* in the dependency injection container for future retrievals.
25			* @throws \DI\DependencyException
26			* @throws \DI\NotFoundException
27			*/
28			private static function reconnectMysql(): mysqli {
29			$newMysqli = DiContainer::make(mysqli::class);
30			DiContainer::getContainer()->set(mysqli::class, $newMysqli);
31			return $newMysqli;
32			}
33
34			public static function mysqliFactory(DatabaseProperties $dbProperties): mysqli {
35			if (!mysqli_report(MYSQLI_REPORT_ERROR\|MYSQLI_REPORT_STRICT)) {
36			throw new RuntimeException('Failed to enable mysqli error reporting');
37			}
38			$mysql = new mysqli(
39			$dbProperties->getHost(),
40			$dbProperties->getUser(),
41			$dbProperties->getPassword(),
42			$dbProperties->getDatabaseName());
43			$charset = $mysql->character_set_name();
44			if ($charset != 'utf8') {
45			throw new RuntimeException('Unexpected charset: ' . $charset);
46			}
47			return $mysql;
48			}
49
50			/**
51			* Database constructor.
52			* Not intended to be constructed by hand. If you need an instance of Database,
53			* use Database::getInstance();
54			* @param ?mysqli $dbConn The mysqli instance (null if reconnect needed)
55			* @param DatabaseProperties $dbProperties The properties object that was used to construct the mysqli instance
56			*/
57			public function __construct(?mysqli $dbConn, DatabaseProperties $dbProperties) {
58			if (is_null($dbConn)) {
59			$dbConn = self::reconnectMysql();
60			}
61			$this->dbConn = $dbConn;
62			$this->dbProperties = $dbProperties;
63			$this->selectedDbName = $dbProperties->getDatabaseName();
64			}
65
66			/**
67			* This method will switch the connection to the specified database.
68			* Useful for switching back and forth between historical, and live databases.
69			*
70			* @param string $databaseName The name of the database to switch to
71			*/
72			public function switchDatabases(string $databaseName) {
73			$this->dbConn->select_db($databaseName);
74			$this->selectedDbName = $databaseName;
75			}
76
77			/**
78			* Switch back to the configured live database
79			*/
80			public function switchDatabaseToLive() {
81			$this->switchDatabases($this->dbProperties->getDatabaseName());
82			}
83
84			/**
85			* Returns the size of the selected database in bytes.
86			*/
87			public function getDbBytes() {
88			$query = 'SELECT SUM(data_length + index_length) as db_bytes FROM information_schema.tables WHERE table_schema=' . $this->escapeString($this->selectedDbName);
89			$result = $this->dbConn->query($query);
90			return (int)$result->fetch_assoc()['db_bytes'];
91			}
92
93			/**
94			* This should not be needed except perhaps by persistent connections
95			*
96			* Closes the connection to the MySQL database. After closing this connection,
97			* this instance is no longer valid, and will subsequently throw exceptions when
98			* attempting to perform database operations.
99			*
100			* You must call Database::getInstance() again to retrieve a valid instance that
101			* is reconnected to the database.
102			*
103			* @return bool Whether the underlying connection was closed by this call.
104			*/
105			public function close() : bool {
106			if (!isset($this->dbConn)) {
107			// Connection is already closed; nothing to do.
108			return false;
109			}
110			$this->dbConn->close();
111			unset($this->dbConn);
112			// Set the mysqli instance in the dependency injection container to
113			// null so that the Database constructor will reconnect the next time
114			// it is called.
115			DiContainer::getContainer()->set(mysqli::class, null);
116			return true;
117			}
118
119			public function query($query) {
120			$this->dbResult = $this->dbConn->query($query);
121			}
122
123			/**
124			* Use to populate this instance with the next record of the active query.
125			*/
126			public function nextRecord(): bool {
127			if (empty($this->dbResult)) {
128			$this->error('No resource to get record from.');
129			}
130			if ($this->dbRecord = $this->dbResult->fetch_assoc()) {
131			return true;
132			}
133			return false;
134			}
135
136			/**
137			* Use instead of nextRecord when exactly one record is expected from the
138			* active query.
139			*/
140			public function requireRecord(): void {
141			if (!$this->nextRecord() \|\| $this->getNumRows() != 1) {
142			$this->error('One record required, but found ' . $this->getNumRows());
143			}
144			}
145
146			public function hasField($name) {
147			return isset($this->dbRecord[$name]);
148			}
149
150			public function getField($name) {
151			return $this->dbRecord[$name];
152			}
153
154			public function getBoolean(string $name) : bool {
155			if ($this->dbRecord[$name] === 'TRUE') {
156			return true;
157			} elseif ($this->dbRecord[$name] === 'FALSE') {
158			return false;
159			}
160			$this->error('Field is not a boolean: ' . $name);
161			}
162
163			public function getInt($name) {
164			return (int)$this->dbRecord[$name];
165			}
166
167			public function getFloat($name) {
168			return (float)$this->dbRecord[$name];
169			}
170
171			public function getMicrotime(string $name) : string {
172			// All digits of precision are stored in a MySQL bigint
173			$data = $this->dbRecord[$name];
174			return sprintf('%f', $data / 1E6);
175			}
176
177			public function getObject($name, $compressed = false, $nullable = false) {
178			$object = $this->getField($name);
179			if ($nullable === true && $object === null) {
180			return null;
181			}
182			if ($compressed === true) {
183			$object = gzuncompress($object);
184			}
185			return unserialize($object);
186			}
187
188			public function getRow() {
189			return $this->dbRecord;
190			}
191
192			public function lockTable($table) {
193			$this->dbConn->query('LOCK TABLES ' . $table . ' WRITE');
194			}
195
196			public function unlock() {
197			$this->dbConn->query('UNLOCK TABLES');
198			}
199
200			public function getNumRows() {
201			return $this->dbResult->num_rows;
202			}
203
204			public function getChangedRows() {
205			return $this->dbConn->affected_rows;
206			}
207
208			public function getInsertID() {
209			return $this->dbConn->insert_id;
210			}
211
212			protected function error($err) {
213			throw new RuntimeException($err);
214			}
215
216			public function escape($escape) {
217			if (is_bool($escape)) {
218			return $this->escapeBoolean($escape);
219			}
220			if (is_numeric($escape)) {
221			return $this->escapeNumber($escape);
222			}
223			if (is_string($escape)) {
224			return $this->escapeString($escape);
225			}
226			if (is_array($escape)) {
227			return $this->escapeArray($escape);
228			}
229			if (is_object($escape)) {
230			return $this->escapeObject($escape);
231			}
232			}
233
234			public function escapeString(?string $string, bool $nullable = false) : string {
235			if ($nullable === true && ($string === null \|\| $string === '')) {
236			return 'NULL';
237			}
238			return '\'' . $this->dbConn->real_escape_string($string) . '\'';
239			}
240
241			public function escapeBinary($binary) {
242			return '0x' . bin2hex($binary);
243			}
244
245			/**
246			* Warning: If escaping a nested array, use escapeIndividually=true,
247			* but beware that the escaped array is flattened!
248			*/
249			public function escapeArray(array $array, string $delimiter = ',', bool $escapeIndividually = true) : string {
250			if ($escapeIndividually) {
251			$string = join($delimiter, array_map(function($item) { return $this->escape($item); }, $array));
252			} else {
253			$string = $this->escape(join($delimiter, $array));
254			}
255			return $string;
256			}
257
258			public function escapeNumber($num) {
259			// Numbers need not be quoted in MySQL queries, so if we know $num is
260			// numeric, we can simply return its value (no quoting or escaping).
261			if (is_numeric($num)) {
262			return $num;
263			} else {
264			$this->error('Not a number! (' . $num . ')');
265			}
266			}
267
268			public function escapeMicrotime(float $microtime) : string {
269			// Retain all digits of precision for storing in a MySQL bigint
270			return sprintf('%d', $microtime * 1E6);
271			}
272
273			public function escapeBoolean(bool $bool) : string {
274			// We store booleans as an enum
275			if ($bool) {
276			return '\'TRUE\'';
277			} else {
278			return '\'FALSE\'';
279			}
280			}
281
282			public function escapeObject($object, bool $compress = false, bool $nullable = false) : string {
283			if ($nullable === true && $object === null) {
284			return 'NULL';
285			}
286			if ($compress === true) {
287			return $this->escapeBinary(gzcompress(serialize($object)));
288			}
289			return $this->escapeString(serialize($object));
290			}
291			}
292

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Database::error() A

Complexity

Size

Duplication

Importance

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