Class Connection

Represents a connection with a database server.

Namespace: Cake\Database

Property Summary

$_config protected

array

Contains the configuration params for this connection.
$_driver protected

Cake\Database\Driver

Driver object, responsible for creating the real connection and provide specific SQL dialect.
$_logQueries protected

bool

Whether to log queries generated during this connection.
$_logger protected

Cake\Database\Log\QueryLogger|null

Logger object instance.
$_schemaCollection protected

Cake\Database\Schema\Collection|null

The schema collection object
$_transactionLevel protected

int

Contains how many nested transactions have been started.
$_transactionStarted protected

bool

Whether a transaction is active in this connection.
$_useSavePoints protected

bool

Whether this connection can and should use savepoints for nested transactions.
$nestedTransactionRollbackException protected

Cake\Database\Exception\NestedTransactionRollbackException|null

NestedTransactionRollbackException object instance, will be stored if the rollback method is called in some nested transaction.

Method Summary

__construct() public

Constructor.
__debugInfo() public

Returns an array that can be used to describe the internal state of this object.
__destruct() public

Destructor
_newLogger() protected

Returns a new statement object that will log the activity for the passed original statement instance.
begin() public

Starts a new transaction.
cacheMetadata() public

Enables or disables metadata caching for this connection
cast() public

Converts a give value to a suitable database value based on type and return relevant internal statement type
commit() public

Commits current transaction.
compileQuery() public

Compiles a Query object into a SQL string according to the dialect for this connection's driver
config() public

Get the configuration data used to create the connection.
configName() public

Get the configuration name for this connection.
connect() public

Connects to the configured database.
createSavePoint() public

Creates a new save point for nested transactions.
delete() public

Executes a DELETE statement on the specified table.
disableConstraints() public

Run an operation with constraints disabled.
disableForeignKeys() public

Run driver specific SQL to disable foreign key checks.
disableQueryLogging() public

Disable query logging
disableSavePoints() public

Disables the usage of savepoints.
disconnect() public

Disconnects from database server.
driver() public deprecated

Sets the driver instance. If a string is passed it will be treated as a class name and will be instantiated.
enableForeignKeys() public

Run driver specific SQL to enable foreign key checks.
enableQueryLogging() public

Enable/disable query logging
enableSavePoints() public

Enables/disables the usage of savepoints, enables only if driver the allows it.
execute() public

Executes a query using $params for interpolating values and $types as a hint for each those params.
getDisconnectRetry() public

Get the retry wrapper object that is allows recovery from server disconnects while performing certain database actions, such as executing a query.
getDriver() public

Gets the driver instance.
getLogger() public

Gets the logger object
getSchemaCollection() public

Gets a Schema\Collection object for this connection.
inTransaction() public

Checks if a transaction is running.
insert() public

Executes an INSERT query on the specified table.
isConnected() public

Returns whether connection to database server was already established.
isQueryLoggingEnabled() public

Check if query logging is enabled.
isSavePointsEnabled() public

Returns whether this connection is using savepoints for nested transactions
log() public

Logs a Query string using the configured logger object.
logQueries() public deprecated

Enables or disables query logging for this connection.
logger() public deprecated

Sets the logger object instance. When called with no arguments it returns the currently setup logger instance.
matchTypes() public

Matches columns to corresponding types
newQuery() public

Create a new Query instance for this connection.
prepare() public

Prepares a SQL statement to be executed.
query() public

Executes a SQL statement and returns the Statement object as result.
quote() public

Quotes value to be used safely in database query.
quoteIdentifier() public

Quotes a database identifier (a column name, table name, etc..) to be used safely in queries without the risk of using reserved words.
releaseSavePoint() public

Releases a save point by its name.
rollback() public

Rollback current transaction.
rollbackSavepoint() public

Rollback a save point by its name.
run() public

Executes the provided query after compiling it for the specific driver dialect and returns the executed Statement object.
schemaCollection() public deprecated

Gets or sets a Schema\Collection object for this connection.
setDriver() public

Sets the driver instance. If a string is passed it will be treated as a class name and will be instantiated.
setLogger() public

Sets a logger
setSchemaCollection() public

Sets a Schema\Collection object for this connection.
supportsDynamicConstraints() public

Returns whether the driver supports adding or dropping constraints to already created tables.
supportsQuoting() public

Checks if the driver supports quoting.
transactional() public

Executes a callable function inside a transaction, if any exception occurs while executing the passed callable, the transaction will be rolled back If the result of the callable function is false, the transaction will also be rolled back. Otherwise the transaction is committed after executing the callback.
update() public

Executes an UPDATE statement on the specified table.
useSavePoints() public deprecated

Returns whether this connection is using savepoints for nested transactions If a boolean is passed as argument it will enable/disable the usage of savepoints only if driver the allows it.
wasNestedTransactionRolledback() protected

Returns whether some nested transaction has been already rolled back.

Method Detail

__construct() ¶ public

__construct(array $config)

Constructor.

Parameters

array $config: configuration for connecting to database

__debugInfo() ¶ public

__debugInfo(): array

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

Returns

array

__destruct() ¶ public

__destruct()

Destructor

Disconnects the driver to release the connection.

_newLogger() ¶ protected

_newLogger(Cake\Database\StatementInterface $statement): Cake\Database\Log\LoggingStatement

Returns a new statement object that will log the activity for the passed original statement instance.

Parameters

Cake\Database\StatementInterface $statement: the instance to be decorated

Returns

Cake\Database\Log\LoggingStatement

begin() ¶ public

begin(): void

Starts a new transaction.

Returns

void

cacheMetadata() ¶ public

cacheMetadata(bool|string $cache): void

Enables or disables metadata caching for this connection

Changing this setting will not modify existing schema collections objects.

Parameters

bool|string $cache: Either boolean false to disable metadata caching, or true to use _cake_model_ or the name of the cache config to use.

Returns

void

cast() ¶ public

cast(mixed $value, Cake\Database\Type|string $type): array

Converts a give value to a suitable database value based on type and return relevant internal statement type

Parameters

mixed $value: The value to cast
Cake\Database\Type|string $type: The type name or type instance to use.

Returns

array

commit() ¶ public

commit(): bool

Commits current transaction.

Returns

bool

compileQuery() ¶ public

compileQuery(Cake\Database\Query $query, Cake\Database\ValueBinder $generator): string

Compiles a Query object into a SQL string according to the dialect for this connection's driver

Parameters

Cake\Database\Query $query: The query to be compiled
Cake\Database\ValueBinder $generator: The placeholder generator to use

Returns

string

config() ¶ public

config(): array

Get the configuration data used to create the connection.

Returns

array

configName() ¶ public

configName(): string

Get the configuration name for this connection.

Returns

string

connect() ¶ public

connect(): bool

Connects to the configured database.

Returns

bool

Throws

Cake\Database\Exception\MissingConnectionException
if credentials are invalid.

createSavePoint() ¶ public

createSavePoint(string|int $name): void

Creates a new save point for nested transactions.

Parameters

string|int $name: The save point name.

Returns

void

delete() ¶ public

delete(string $table, array $conditions = [], array $types = []): Cake\Database\StatementInterface

Executes a DELETE statement on the specified table.

Parameters

string $table: the table to delete rows from
array $conditions optional: conditions to be set for delete statement
array $types optional: list of associative array containing the types to be used for casting

Returns

Cake\Database\StatementInterface

disableConstraints() ¶ public

disableConstraints(callable $operation): mixed

Run an operation with constraints disabled.

Example:

$connection->disableConstraints(function ($connection) {
  $connection->newQuery()->delete('users')->execute();
});

Parameters

callable $operation

Returns

mixed

disableForeignKeys() ¶ public

disableForeignKeys(): void

Run driver specific SQL to disable foreign key checks.

Returns

void

disableQueryLogging() ¶ public

disableQueryLogging(): $this

Disable query logging

Returns

$this

disableSavePoints() ¶ public

disableSavePoints(): $this

Disables the usage of savepoints.

Returns

$this

disconnect() ¶ public

disconnect(): void

Disconnects from database server.

Returns

void

driver() ¶ public

driver(Cake\Database\Driver|string|null $driver = null, array $config = []): Cake\Database\Driver

Sets the driver instance. If a string is passed it will be treated as a class name and will be instantiated.

If no params are passed it will return the current driver instance.

Parameters

Cake\Database\Driver|string|null $driver optional: The driver instance to use.
array $config optional: Either config for a new driver or null.

Returns

Cake\Database\Driver

Throws

Cake\Database\Exception\MissingDriverException
When a driver class is missing.
Cake\Database\Exception\MissingExtensionException
When a driver's PHP extension is missing.

enableForeignKeys() ¶ public

enableForeignKeys(): void

Run driver specific SQL to enable foreign key checks.

Returns

void

enableQueryLogging() ¶ public

enableQueryLogging(mixed $value): $this

Enable/disable query logging

Parameters

$value: Enable/disable query logging

Returns

$this

enableSavePoints() ¶ public

enableSavePoints(bool $enable): $this

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

If you are trying to enable this feature, make sure you check the return value of this function to verify it was enabled successfully.

Example:

$connection->enableSavePoints(true) Returns true if drivers supports save points, false otherwise $connection->enableSavePoints(false) Disables usage of savepoints and returns false

Parameters

bool $enable: Whether or not save points should be used.

Returns

$this

execute() ¶ public

execute(mixed $query, array $params = [], array $types = []): Cake\Database\StatementInterface

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

Parameters

$query: SQL to be executed and interpolated with $params
array $params optional: list or associative array of params to be interpolated in $query as values
array $types optional: list or associative array of types to be used for casting values in query

Returns

Cake\Database\StatementInterface

getDisconnectRetry() ¶ public

getDisconnectRetry(): Cake\Core\Retry\CommandRetry

Get the retry wrapper object that is allows recovery from server disconnects while performing certain database actions, such as executing a query.

Returns

Cake\Core\Retry\CommandRetry

getDriver() ¶ public

getDriver(): Cake\Database\Driver

Gets the driver instance.

Returns

Cake\Database\Driver

getLogger() ¶ public

getLogger(): Cake\Database\Log\QueryLogger

Gets the logger object

Returns

Cake\Database\Log\QueryLogger

getSchemaCollection() ¶ public

getSchemaCollection(): Cake\Database\Schema\Collection

Gets a Schema\Collection object for this connection.

Returns

Cake\Database\Schema\Collection

inTransaction() ¶ public

inTransaction(): bool

Checks if a transaction is running.

Returns

bool

insert() ¶ public

insert(string $table, array $data, array $types = []): Cake\Database\StatementInterface

Executes an INSERT query on the specified table.

Parameters

string $table: the table to insert values in
array $data: values to be inserted
array $types optional: list of associative array containing the types to be used for casting

Returns

Cake\Database\StatementInterface

isConnected() ¶ public

isConnected(): bool

Returns whether connection to database server was already established.

Returns

bool

isQueryLoggingEnabled() ¶ public

isQueryLoggingEnabled(): bool

Check if query logging is enabled.

Returns

bool

isSavePointsEnabled() ¶ public

isSavePointsEnabled(): bool

Returns whether this connection is using savepoints for nested transactions

Returns

bool

log() ¶ public

log(string $sql): void

Logs a Query string using the configured logger object.

Parameters

string $sql: string to be logged

Returns

void

logQueries() ¶ public

logQueries(bool|null $enable = null): bool

Enables or disables query logging for this connection.

Parameters

bool|null $enable optional

Returns

bool

logger() ¶ public

logger(object|null $instance = null): object

Sets the logger object instance. When called with no arguments it returns the currently setup logger instance.

Parameters

object|null $instance optional

Returns

object

matchTypes() ¶ public

matchTypes(array $columns, array $types): array

Matches columns to corresponding types

Both $columns and $types should either be numeric based or string key based at the same time.

Parameters

array $columns: list or associative array of columns and parameters to be bound with types
array $types: list or associative array of types

Returns

array

newQuery() ¶ public

newQuery(): Cake\Database\Query

Create a new Query instance for this connection.

Returns

Cake\Database\Query

prepare() ¶ public

prepare(mixed $sql): Cake\Database\StatementInterface

Prepares a SQL statement to be executed.

Parameters

$sql: The SQL to convert into a prepared statement.

Returns

Cake\Database\StatementInterface

query() ¶ public

query(string $sql): Cake\Database\StatementInterface

Executes a SQL statement and returns the Statement object as result.

Parameters

string $sql: The SQL query to execute.

Returns

Cake\Database\StatementInterface

quote() ¶ public

quote(mixed $value, mixed $type = null): string

Quotes value to be used safely in database query.

Parameters

$value: The value to quote.
$type optional: Type to be used for determining kind of quoting to perform

Returns

string

quoteIdentifier() ¶ public

quoteIdentifier(string $identifier): string

Quotes a database identifier (a column name, table name, etc..) to be used safely in queries without the risk of using reserved words.

Parameters

string $identifier: The identifier to quote.

Returns

string

releaseSavePoint() ¶ public

releaseSavePoint(string|int $name): void

Releases a save point by its name.

Parameters

string|int $name: The save point name.

Returns

void

rollback() ¶ public

rollback(bool|null $toBeginning = null): bool

Rollback current transaction.

Parameters

bool|null $toBeginning optional: Whether or not the transaction should be rolled back to the beginning of it. Defaults to false if using savepoints, or true if not.

Returns

bool

rollbackSavepoint() ¶ public

rollbackSavepoint(string|int $name): void

Rollback a save point by its name.

Parameters

string|int $name: The save point name.

Returns

void

run() ¶ public

run(Cake\Database\Query $query): Cake\Database\StatementInterface

Executes the provided query after compiling it for the specific driver dialect and returns the executed Statement object.

Parameters

Cake\Database\Query $query: The query to be executed

Returns

Cake\Database\StatementInterface

schemaCollection() ¶ public

schemaCollection(Cake\Database\Schema\Collection|null $collection = null): Cake\Database\Schema\Collection

Gets or sets a Schema\Collection object for this connection.

Parameters

Cake\Database\Schema\Collection|null $collection optional: The schema collection object

Returns

Cake\Database\Schema\Collection

setDriver() ¶ public

setDriver(Cake\Database\Driver|string $driver, array $config = []): $this

Sets the driver instance. If a string is passed it will be treated as a class name and will be instantiated.

Parameters

Cake\Database\Driver|string $driver: The driver instance to use.
array $config optional: Config for a new driver.

Returns

$this

Throws

Cake\Database\Exception\MissingDriverException
When a driver class is missing.
Cake\Database\Exception\MissingExtensionException
When a driver's PHP extension is missing.

setLogger() ¶ public

setLogger(mixed $logger): $this

Sets a logger

Parameters

$logger: Logger object

Returns

$this

setSchemaCollection() ¶ public

setSchemaCollection(Cake\Database\Schema\Collection $collection): $this

Sets a Schema\Collection object for this connection.

Parameters

Cake\Database\Schema\Collection $collection: The schema collection object

Returns

$this

supportsDynamicConstraints() ¶ public

supportsDynamicConstraints(): bool

Returns whether the driver supports adding or dropping constraints to already created tables.

Returns

bool

supportsQuoting() ¶ public

supportsQuoting(): bool

Checks if the driver supports quoting.

Returns

bool

transactional() ¶ public

transactional(callable $transaction): mixed

Executes a callable function inside a transaction, if any exception occurs while executing the passed callable, the transaction will be rolled back If the result of the callable function is false, the transaction will also be rolled back. Otherwise the transaction is committed after executing the callback.

Example:

$connection->transactional(function ($connection) {
  $connection->newQuery()->delete('users')->execute();
});

Parameters

callable $transaction

Returns

mixed

update() ¶ public

update(string $table, array $data, array $conditions = [], array $types = []): Cake\Database\StatementInterface

Executes an UPDATE statement on the specified table.

Parameters

string $table: the table to update rows from
array $data: values to be updated
array $conditions optional: conditions to be set for update statement
array $types optional: list of associative array containing the types to be used for casting

Returns

Cake\Database\StatementInterface

useSavePoints() ¶ public

useSavePoints(bool|null $enable = null): bool

Returns whether this connection is using savepoints for nested transactions If a boolean is passed as argument it will enable/disable the usage of savepoints only if driver the allows it.

If you are trying to enable this feature, make sure you check the return value of this function to verify it was enabled successfully.

Example:

$connection->useSavePoints(true) Returns true if drivers supports save points, false otherwise $connection->useSavePoints(false) Disables usage of savepoints and returns false $connection->useSavePoints() Returns current status

Parameters

bool|null $enable optional: Whether or not save points should be used.

Returns

bool

wasNestedTransactionRolledback() ¶ protected

wasNestedTransactionRolledback(): bool

Returns whether some nested transaction has been already rolled back.

Returns

bool

Property Detail

`$_config` ¶ protected

Contains the configuration params for this connection.

Type

array

`$_driver` ¶ protected

Driver object, responsible for creating the real connection and provide specific SQL dialect.

Type

Cake\Database\Driver

`$_logQueries` ¶ protected

Whether to log queries generated during this connection.

Type

bool

`$_logger` ¶ protected

Logger object instance.

Type

Cake\Database\Log\QueryLogger|null

`$_schemaCollection` ¶ protected

The schema collection object

Type

Cake\Database\Schema\Collection|null

`$_transactionLevel` ¶ protected

Contains how many nested transactions have been started.

Type

int

`$_transactionStarted` ¶ protected

Whether a transaction is active in this connection.

Type

bool

`$_useSavePoints` ¶ protected

Whether this connection can and should use savepoints for nested transactions.

Type

bool

`$nestedTransactionRollbackException` ¶ protected

NestedTransactionRollbackException object instance, will be stored if the rollback method is called in some nested transaction.

Type

Cake\Database\Exception\NestedTransactionRollbackException|null

Namespaces

Class Connection

Property Summary

Method Summary

__construct() public

__debugInfo() public

__destruct() public

_newLogger() protected

begin() public

cacheMetadata() public

cast() public

commit() public

compileQuery() public

config() public

configName() public

connect() public

createSavePoint() public

delete() public

disableConstraints() public

disableForeignKeys() public

disableQueryLogging() public

disableSavePoints() public

disconnect() public

driver() public deprecated

enableForeignKeys() public

enableQueryLogging() public

enableSavePoints() public

execute() public

getDisconnectRetry() public

getDriver() public

getLogger() public

getSchemaCollection() public

inTransaction() public

insert() public

isConnected() public

isQueryLoggingEnabled() public

isSavePointsEnabled() public

log() public

logQueries() public deprecated

logger() public deprecated

matchTypes() public

newQuery() public

prepare() public

query() public

quote() public

quoteIdentifier() public

releaseSavePoint() public

rollback() public

rollbackSavepoint() public

run() public

schemaCollection() public deprecated

setDriver() public

setLogger() public

setSchemaCollection() public

supportsDynamicConstraints() public

supportsQuoting() public

transactional() public

update() public

useSavePoints() public deprecated

wasNestedTransactionRolledback() protected

Method Detail

__construct() ¶ public

Parameters

__debugInfo() ¶ public

Returns

__destruct() ¶ public

_newLogger() ¶ protected

Parameters

Returns

begin() ¶ public

Returns

cacheMetadata() ¶ public

Parameters

Returns

cast() ¶ public

Parameters

Returns

commit() ¶ public

Returns

compileQuery() ¶ public