database/Connection.php at 5.x · cakephp/database · GitHub

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<?php

declare(strict_types=1);

/**

* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)

* Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)

* Licensed under The MIT License

* For full copyright and license information, please see the LICENSE.txt

* Redistributions of files must retain the above copyright notice.

* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)

* @link https://cakephp.org CakePHP(tm) Project

* @since 3.0.0

* @license https://opensource.org/licenses/mit-license.php MIT License

namespace Cake\Database;

use Cake\Cache\Cache;

use Cake\Core\App;

use Cake\Core\Exception\CakeException;

use Cake\Core\Retry\CommandRetry;

use Cake\Database\Exception\MissingDriverException;

use Cake\Database\Exception\MissingExtensionException;

use Cake\Database\Exception\NestedTransactionRollbackException;

use Cake\Database\Query\DeleteQuery;

use Cake\Database\Query\InsertQuery;

use Cake\Database\Query\QueryFactory;

use Cake\Database\Query\SelectQuery;

use Cake\Database\Query\UpdateQuery;

use Cake\Database\Retry\ReconnectStrategy;

use Cake\Database\Schema\CachedCollection;

use Cake\Database\Schema\Collection as SchemaCollection;

use Cake\Database\Schema\CollectionInterface as SchemaCollectionInterface;

use Cake\Datasource\ConnectionInterface;

use Cake\Event\EventDispatcherInterface;

use Cake\Event\EventDispatcherTrait;

use Cake\Log\Log;

use Closure;

use Psr\SimpleCache\CacheInterface;

use Throwable;

use function Cake\Core\env;

/**

* Represents a connection with a database server.

* ### Events

* - `Connection.afterCommit` Fired after the outermost transaction commits.

* Listeners receive the connection as the event subject. Not fired on

* rollback or for nested commits.

class Connection implements ConnectionInterface, EventDispatcherInterface

{

use EventDispatcherTrait;

/**

* Contains the configuration params for this connection.

* @var array<string, mixed>

protected array $_config;

/**

* @var \Cake\Database\Driver

protected Driver $readDriver;

/**

* @var \Cake\Database\Driver

protected Driver $writeDriver;

/**

* Contains how many nested transactions have been started.

* @var int

protected int $_transactionLevel = 0;

/**

* Whether a transaction is active in this connection.

* @var bool

protected bool $_transactionStarted = false;

/**

* Whether this connection can and should use savepoints for nested

* transactions.

* @var bool

protected bool $_useSavePoints = false;

/**

* Cacher object instance.

* @var \Psr\SimpleCache\CacheInterface|null

protected ?CacheInterface $cacher = null;

/**

* The schema collection object

* @var \Cake\Database\Schema\CollectionInterface|null

protected ?SchemaCollectionInterface $_schemaCollection = null;

/**

* NestedTransactionRollbackException object instance, will be stored if

* the rollback method is called in some nested transaction.

* @var \Cake\Database\Exception\NestedTransactionRollbackException|null

protected ?NestedTransactionRollbackException $nestedTransactionRollbackException = null;

/**

* Callbacks to execute after the outermost transaction commits.

* @var array<\Closure>

protected array $afterCommitCallbacks = [];

protected QueryFactory $queryFactory;

/**

* Constructor.

* ### Available options:

* - `driver` Sort name or FQCN for driver.

* - `log` Boolean indicating whether to use query logging.

* - `name` Connection name.

* - `cacheMetaData` Boolean indicating whether metadata (datasource schemas) should be cached.

* If set to a string it will be used as the name of cache config to use.

* - `cacheKeyPrefix` Custom prefix to use when generation cache keys. Defaults to connection name.

* @param array<string, mixed> $config Configuration array.

* @throws \Cake\Database\Exception\MissingDriverException when the driver class cannot be found

* @throws \Cake\Database\Exception\MissingExtensionException when the database extension is not enabled

public function __construct(array $config)

{

$this->_config = $config;

[self::ROLE_READ => $this->readDriver, self::ROLE_WRITE => $this->writeDriver] = $this->createDrivers($config);

}

/**

* Creates read and write drivers.

* @param array<string, mixed> $config Connection config

* @return array{self::ROLE_READ: \Cake\Database\Driver, self::ROLE_WRITE: \Cake\Database\Driver}

protected function createDrivers(array $config): array

{

$driver = $config['driver'] ?? '';

if (!is_string($driver)) {

assert($driver instanceof Driver);

if (!$driver->enabled()) {

throw new MissingExtensionException(['driver' => $driver::class, 'name' => $this->configName()]);

}

// Legacy support for setting instance instead of driver class

return [self::ROLE_READ => $driver, self::ROLE_WRITE => $driver];

}

/** @var class-string<\Cake\Database\Driver>|null $driverClass */

$driverClass = App::className($driver, 'Database/Driver');

if ($driverClass === null) {

throw new MissingDriverException(['driver' => $driver, 'connection' => $this->configName()]);

}

$sharedConfig = array_diff_key($config, array_flip([

'className',

'driver',

'cacheMetaData',

'cacheKeyPrefix',

'read',

'write',

]));

$writeConfig = ($config['write'] ?? []) + $sharedConfig;

$readConfig = ($config['read'] ?? []) + $sharedConfig;

if (array_key_exists('write', $config) || array_key_exists('read', $config)) {

$readDriver = new $driverClass(['_role' => self::ROLE_READ] + $readConfig);

$writeDriver = new $driverClass(['_role' => self::ROLE_WRITE] + $writeConfig);

} else {

$readDriver = new $driverClass(['_role' => self::ROLE_WRITE] + $writeConfig);

$writeDriver = $readDriver;

}

if (!$writeDriver->enabled()) {

throw new MissingExtensionException(['driver' => $writeDriver::class, 'name' => $this->configName()]);

}

return [self::ROLE_READ => $readDriver, self::ROLE_WRITE => $writeDriver];

}

/**

* Destructor

* Disconnects the driver to release the connection.

public function __destruct()

{

if ($this->_transactionStarted && class_exists(Log::class)) {

$message = 'The connection is going to be closed but there is an active transaction.';

$requestUrl = env('REQUEST_URI');

if ($requestUrl) {

$message .= "\nRequest URL: " . $requestUrl;

}

$clientIp = env('REMOTE_ADDR');

if ($clientIp) {

$message .= "\nClient IP: " . $clientIp;

}

Log::warning($message);

}

/**

* @inheritDoc

public function config(): array

{

return $this->_config;

}

/**

* @inheritDoc

public function configName(): string

{

return $this->_config['name'] ?? '';

}

/**

* Returns the connection role: read or write.

* @return string

public function role(): string

{

return preg_match('/:read$/', $this->configName()) === 1 ? static::ROLE_READ : static::ROLE_WRITE;

}

/**

* Get the retry wrapper object that is allows recovery from server disconnects

* while performing certain database actions, such as executing a query.

* @return \Cake\Core\Retry\CommandRetry The retry wrapper

public function getDisconnectRetry(): CommandRetry

{

return new CommandRetry(new ReconnectStrategy($this));

}

/**

* Gets the role-specific driver instance.

* @param string $role Connection role ('read' or 'write')

* @return \Cake\Database\Driver

public function getDriver(string $role = self::ROLE_WRITE): Driver

{

assert($role === self::ROLE_READ || $role === self::ROLE_WRITE);

return $role === self::ROLE_READ ? $this->getReadDriver() : $this->getWriteDriver();

}

/**

* Gets the read-role driver instance.

* @return \Cake\Database\Driver

public function getReadDriver(): Driver

{

return $this->readDriver;

}

/**

* Gets the write-role driver instance.

* @return \Cake\Database\Driver

public function getWriteDriver(): Driver

{

return $this->writeDriver;

}

/**

* Executes a query using $params for interpolating values and $types as a hint for each

* those params.

* @param string $sql SQL to be executed and interpolated with $params

* @param array $params list or associative array of params to be interpolated in $sql as values

* @param array $types list or associative array of types to be used for casting values in query

* @return \Cake\Database\StatementInterface executed statement

public function execute(string $sql, array $params = [], array $types = []): StatementInterface

{

return $this->getDisconnectRetry()->run(fn() => $this->getWriteDriver()->execute($sql, $params, $types));

}

/**

* Executes the provided query after compiling it for the specific driver

* dialect and returns the executed Statement object.

* @param \Cake\Database\Query $query The query to be executed

* @return \Cake\Database\StatementInterface executed statement

public function run(Query $query): StatementInterface

{

return $this->getDisconnectRetry()->run(fn() => $this->getDriver($query->getConnectionRole())->run($query));

}

/**

* Get query factory instance.

* @return \Cake\Database\Query\QueryFactory

public function queryFactory(): QueryFactory

{

return $this->queryFactory ??= new QueryFactory($this);

}

/**

* Create a new SelectQuery instance for this connection.

* @param array|string $table The table or list of tables to query.

* @param array<string, string> $types Associative array containing the types to be used for casting.

* @return \Cake\Database\Query\SelectQuery<mixed>

public function selectQuery(

array|string $table = [],

array $types = [],

): SelectQuery {

return $this->queryFactory()->select($fields, $table, $types);

}

/**

* Create a new InsertQuery instance for this connection.

* @param string|null $table The table to insert rows into.

* @param array $values Associative array of column => value to be inserted.

* @param array<int|string, string> $types Associative array containing the types to be used for casting.

* @return \Cake\Database\Query\InsertQuery

public function insertQuery(?string $table = null, array $values = [], array $types = []): InsertQuery

{

return $this->queryFactory()->insert($table, $values, $types);

}

/**

* Create a new UpdateQuery instance for this connection.

* @param \Cake\Database\ExpressionInterface|string|null $table The table to update rows of.

* @param array $values Values to be updated.

* @param array $conditions Conditions to be set for the update statement.

* @param array<string, string> $types Associative array containing the types to be used for casting.

* @return \Cake\Database\Query\UpdateQuery

public function updateQuery(

ExpressionInterface|string|null $table = null,

array $values = [],

array $conditions = [],

array $types = [],

): UpdateQuery {

return $this->queryFactory()->update($table, $values, $conditions, $types);

}

/**

* Create a new DeleteQuery instance for this connection.

* @param string|null $table The table to delete rows from.

* @param array $conditions Conditions to be set for the delete statement.

* @param array<string, string> $types Associative array containing the types to be used for casting.

* @return \Cake\Database\Query\DeleteQuery

public function deleteQuery(?string $table = null, array $conditions = [], array $types = []): DeleteQuery

{

return $this->queryFactory()->delete($table, $conditions, $types);

}

/**

* Sets a Schema\Collection object for this connection.

* @param \Cake\Database\Schema\CollectionInterface $collection The schema collection object

* @return $this

public function setSchemaCollection(SchemaCollectionInterface $collection)

{

$this->_schemaCollection = $collection;

return $this;

}

/**

* Gets a Schema\Collection object for this connection.

* @return \Cake\Database\Schema\CollectionInterface

public function getSchemaCollection(): SchemaCollectionInterface

{

if ($this->_schemaCollection !== null) {

return $this->_schemaCollection;

}

if (!empty($this->_config['cacheMetadata'])) {

return $this->_schemaCollection = new CachedCollection(

new SchemaCollection($this),

empty($this->_config['cacheKeyPrefix']) ? $this->configName() : $this->_config['cacheKeyPrefix'],

$this->getCacher(),

);

}

return $this->_schemaCollection = new SchemaCollection($this);

}

/**

* Executes an INSERT query on the specified table.

* @param string $table the table to insert values in

* @param array $values values to be inserted

* @param array<string, string> $types Array containing the types to be used for casting

* @return \Cake\Database\StatementInterface

public function insert(string $table, array $values, array $types = []): StatementInterface

{

return $this->insertQuery($table, $values, $types)->execute();

}

/**

* Executes an UPDATE statement on the specified table.

* @param string $table the table to update rows from

* @param array $values values to be updated

* @param array $conditions conditions to be set for update statement

* @param array<string, string> $types list of associative array containing the types to be used for casting

* @return \Cake\Database\StatementInterface

public function update(string $table, array $values, array $conditions = [], array $types = []): StatementInterface

{

return $this->updateQuery($table, $values, $conditions, $types)->execute();

}

/**

* Executes a DELETE statement on the specified table.

* @param string $table the table to delete rows from

* @param array $conditions conditions to be set for delete statement

* @param array<string, string> $types list of associative array containing the types to be used for casting

* @return \Cake\Database\StatementInterface

public function delete(string $table, array $conditions = [], array $types = []): StatementInterface

{

return $this->deleteQuery($table, $conditions, $types)->execute();

}

/**

* Starts a new transaction.

* @return void

public function begin(): void

{

if (!$this->_transactionStarted) {

$this->getDisconnectRetry()->run(function (): void {

$this->getWriteDriver()->beginTransaction();

});

$this->_transactionLevel = 0;

$this->_transactionStarted = true;

$this->nestedTransactionRollbackException = null;

return;

}

$this->_transactionLevel++;

if ($this->isSavePointsEnabled()) {

$this->createSavePoint((string)$this->_transactionLevel);

}

/**

* Register a callback to run after the outermost transaction commits.

* If no transaction is active, the callback executes immediately.

* Callbacks are discarded on rollback.

* @param \Closure $callback Callback to execute after commit.

* @return void

public function afterCommit(Closure $callback): void

{

if (!$this->_transactionStarted) {

$callback();

return;

}

$this->afterCommitCallbacks[] = $callback;

}

/**

* Commits current transaction.

* @return bool true on success, false otherwise

* @throws \Cake\Database\Exception\NestedTransactionRollbackException when a nested transaction was rolled back

public function commit(): bool

{

if (!$this->_transactionStarted) {

return false;

}

if ($this->_transactionLevel === 0) {

if ($this->wasNestedTransactionRolledback()) {

$e = $this->nestedTransactionRollbackException;

assert($e !== null);

$this->nestedTransactionRollbackException = null;

throw $e;

}

$this->_transactionStarted = false;

$this->nestedTransactionRollbackException = null;

$result = $this->getWriteDriver()->commitTransaction();

$callbacks = $this->afterCommitCallbacks;

$this->afterCommitCallbacks = [];

foreach ($callbacks as $cb) {

$cb();

}

$this->dispatchEvent('Connection.afterCommit');

return $result;

}

if ($this->isSavePointsEnabled()) {

$this->releaseSavePoint((string)$this->_transactionLevel);

}

$this->_transactionLevel--;

return true;

}

/**

* Rollback current transaction.

* @param bool|null $toBeginning Whether the transaction should be rolled back to the

* beginning of it. Defaults to false if using savepoints, or true if not.

* @return bool

public function rollback(?bool $toBeginning = null): bool

{

if (!$this->_transactionStarted) {

return false;

}

$useSavePoint = $this->isSavePointsEnabled();

$toBeginning ??= !$useSavePoint;

if ($this->_transactionLevel === 0 || $toBeginning) {

$this->_transactionLevel = 0;

$this->_transactionStarted = false;

$this->nestedTransactionRollbackException = null;

$this->afterCommitCallbacks = [];

$this->getWriteDriver()->rollbackTransaction();

return true;

}

$savePoint = $this->_transactionLevel--;

if ($useSavePoint) {

$this->rollbackSavepoint($savePoint);

} else {

$this->nestedTransactionRollbackException ??= new NestedTransactionRollbackException();

}

return true;

}

/**

* Enables/disables the usage of savepoints, enables only if the driver allows it.

* If you are trying to enable this feature, make sure you check

* `isSavePointsEnabled()` to verify that savepoints were enabled successfully.

* @param bool $enable Whether save points should be used.

* @return $this

public function enableSavePoints(bool $enable = true)

{

if ($enable === false) {

$this->_useSavePoints = false;

} else {

$this->_useSavePoints = $this->getWriteDriver()->supports(DriverFeatureEnum::SAVEPOINT);

}

return $this;

}

/**

* Disables the usage of savepoints.

* @return $this

public function disableSavePoints()

{

$this->_useSavePoints = false;

return $this;

}

/**

* Returns whether this connection is using savepoints for nested transactions

* @return bool true if enabled, false otherwise

public function isSavePointsEnabled(): bool

{

return $this->_useSavePoints;

}

/**

* Creates a new save point for nested transactions.

* @param string|int $name Save point name or id

* @return void

public function createSavePoint(string|int $name): void

{

$this->execute($this->getWriteDriver()->savePointSQL($name));

}

/**

* Releases a save point by its name.

* @param string|int $name Save point name or id

* @return void

public function releaseSavePoint(string|int $name): void

{

$sql = $this->getWriteDriver()->releaseSavePointSQL($name);

if ($sql) {

$this->execute($sql);

}

/**

* Rollback a save point by its name.

* @param string|int $name Save point name or id

* @return void

public function rollbackSavepoint(string|int $name): void

{

$this->execute($this->getWriteDriver()->rollbackSavePointSQL($name));

}

/**

* Run driver specific SQL to disable foreign key checks.

* @return void

public function disableForeignKeys(): void

{

$this->getDisconnectRetry()->run(function (): void {

$this->execute($this->getWriteDriver()->disableForeignKeySQL());

});

}

/**

* Run driver specific SQL to enable foreign key checks.

* @return void

public function enableForeignKeys(): void

{

$this->getDisconnectRetry()->run(function (): void {

$this->execute($this->getWriteDriver()->enableForeignKeySQL());

});

}

/**

* Executes a callback inside a transaction, if any exception occurs

* while executing the passed callback, the transaction will be rolled back

* If the result of the callback is `false`, the transaction will

* also be rolled back. Otherwise the transaction is committed after executing

* the callback.

* The callback will receive the connection instance as its first argument.

* ### Example:

* ```

* $connection->transactional(function ($connection) {

* $connection->deleteQuery('users')->execute();

* });

* ```

* @param \Closure $callback The callback to execute within a transaction.

* @return mixed The return value of the callback.

* @throws \Exception Will re-throw any exception raised in $callback after

* rolling back the transaction.

public function transactional(Closure $callback): mixed

{

$this->begin();

try {

$result = $callback($this);

} catch (Throwable $e) {

$this->rollback(false);

throw $e;

}

if ($result === false) {

$this->rollback(false);

return false;

}

try {

$this->commit();

} catch (NestedTransactionRollbackException $e) {

$this->rollback(false);

throw $e;

}

return $result;

}

/**

* Returns whether some nested transaction has been already rolled back.

* @return bool

protected function wasNestedTransactionRolledback(): bool

{

return $this->nestedTransactionRollbackException instanceof NestedTransactionRollbackException;

}

/**

* Run an operation with constraints disabled.

* Constraints should be re-enabled after the callback succeeds/fails.

* ### Example:

* ```

* $connection->disableConstraints(function ($connection) {

* $connection->insertQuery('users')->execute();

* });

* ```

* @param \Closure $callback Callback to run with constraints disabled

* @return mixed The return value of the callback.

* @throws \Exception Will re-throw any exception raised in $callback after

* rolling back the transaction.

public function disableConstraints(Closure $callback): mixed

{

return $this->getDisconnectRetry()->run(function () use ($callback) {

$this->disableForeignKeys();

try {

$result = $callback($this);

} finally {

$this->enableForeignKeys();

}

return $result;

});

}

/**

* Checks if a transaction is running.

* @return bool True if a transaction is running else false.

public function inTransaction(): bool

{

return $this->_transactionStarted;

}

/**

* Enables or disables metadata caching for this connection

* Changing this setting will not modify existing schema collections objects.

* @param string|bool $cache Either boolean false to disable metadata caching, or

* true to use `_cake_model_` or the name of the cache config to use.

* @return void

public function cacheMetadata(string|bool $cache): void

{

$this->_schemaCollection = null;

$this->_config['cacheMetadata'] = $cache;

if (is_string($cache)) {

$this->cacher = null;

}

/**

* @inheritDoc

public function setCacher(CacheInterface $cacher)

{

$this->cacher = $cacher;

return $this;

}

/**

* @inheritDoc

public function getCacher(): CacheInterface

{

if ($this->cacher !== null) {

return $this->cacher;

}

$configName = $this->_config['cacheMetadata'] ?? '_cake_model_';

if (!is_string($configName)) {

$configName = '_cake_model_';

}

if (!class_exists(Cache::class)) {

throw new CakeException(

'To use caching you must either set a cacher using Connection::setCacher()' .

' or require the cakephp/cache package in your composer config.',

);

}

return $this->cacher = Cache::pool($configName);

}

/**

* Returns an array that can be used to describe the internal state of this

* object.

* @return array<string, mixed>

public function __debugInfo(): array

{

$secrets = [

'password' => '*****',

'username' => '*****',

'host' => '*****',

'database' => '*****',

'port' => '*****',

];

$replace = array_intersect_key($secrets, $this->_config);

$config = $replace + $this->_config;

if (isset($config['read'])) {

$config['read'] = array_intersect_key($secrets, $config['read']) + $config['read'];

}

if (isset($config['write'])) {

$config['write'] = array_intersect_key($secrets, $config['write']) + $config['write'];

}

return [

'config' => $config,

'readDriver' => $this->readDriver,

'writeDriver' => $this->writeDriver,

'transactionLevel' => $this->_transactionLevel,

'transactionStarted' => $this->_transactionStarted,

'useSavePoints' => $this->_useSavePoints,

];

}

database/Connection.php at 5.x · cakephp/database · GitHub

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