The Elgg database. More...

Public Member Functions
	__construct (DbConfig $config, QueryCache $query_cache)
	Constructor. More...

	resetConnections (DbConfig $config)
	Reset the connections with new credentials. More...

	closeConnections ()
	Close all database connections. More...

	getConnection (string $type)
	Gets (if required, also creates) a DB connection. More...

	setupConnections ()
	Establish database connections. More...

	connect (string $type= 'readwrite')
	Establish a connection to the database server. More...

	getData (QueryBuilder $query, $callback=null)
	Retrieve rows from the database. More...

	getDataRow (QueryBuilder $query, $callback=null)
	Retrieve a single row from the database. More...

	insertData (QueryBuilder $query)
	Insert a row into the database. More...

	updateData (QueryBuilder $query, bool $get_num_rows=false)
	Update the database. More...

	deleteData (QueryBuilder $query)
	Delete data from the database. More...

	trackQuery (QueryBuilder $query, callable $callback)
	Tracks the query count and timers for a given query. More...

	registerDelayedQuery (QueryBuilder $query, $callback=null)
	Queue a query for execution upon shutdown. More...

	executeDelayedQueries ()
	Trigger all queries that were registered as "delayed" queries. More...

	enableQueryCache ()
	Enable the query cache. More...

	disableQueryCache ()
	Disable the query cache. More...

	getQueryCount ()
	Get the number of queries made to the database. More...

	getServerVersion (string $type=DbConfig::READ_WRITE)
	Get the server version number. More...

	isMariaDB (string $type=DbConfig::READ_WRITE)
	Is the database MariaDB. More...

	__get ($name)
	Handle magic property reads. More...

	__set ($name, $value)
	Handle magic property writes. More...

Public Attributes
const	DELAYED_QUERY = 'q'

const	DELAYED_HANDLER = 'h'

Protected Member Functions
	fingerprintCallback ($callback)
	Get a string that uniquely identifies a callback during the current request. More...

	getResults (QueryBuilder $query, $callback=null, bool $single=false)
	Handles queries that return results, running the results through a an optional callback function. More...

	executeQuery (QueryBuilder $query)
	Execute a query. More...

Protected Attributes
	$query_cache

	$delayed_queries = []

Detailed Description

The Elgg database.

Definition at line 25 of file Database.php.

Constructor & Destructor Documentation

Elgg\Database::__construct	(	DbConfig	$config,
		QueryCache	$query_cache
	)

Constructor.

Parameters

DbConfig	$config	DB configuration
QueryCache	$query_cache	Query Cache

Definition at line 75 of file Database.php.

Member Function Documentation

Elgg\Database::__get ( $name )

Handle magic property reads.

Parameters

string $name Property name

Returns: mixed

Exceptions

RuntimeException

Definition at line 583 of file Database.php.

Elgg\Database::__set	(	$name,
		$value
	)

Handle magic property writes.

Parameters

string	$name	Property name
mixed	$value	Value

Returns: void

Exceptions

RuntimeException

Definition at line 600 of file Database.php.

Elgg\Database::closeConnections ( )

Close all database connections.

Note: this is only meant to be used in the PHPUnit test suites

Returns: void

Since: 4.1

Definition at line 105 of file Database.php.

Elgg\Database::connect ( string $type = 'readwrite' )

Establish a connection to the database server.

Connect to the database server and use the Elgg database for a particular database link

Parameters

string $type The type of database connection. "read", "write", or "readwrite".

Returns: void

Exceptions

DatabaseException

Definition at line 159 of file Database.php.

Elgg\Database::deleteData ( QueryBuilder $query )

Delete data from the database.

Note: Altering the DB invalidates all queries in query cache.

Parameters

QueryBuilder $query The SQL query to run

Returns: int The number of affected rows

Definition at line 284 of file Database.php.

Elgg\Database::disableQueryCache ( )

Disable the query cache.

This is useful for special scripts that pull large amounts of data back in single queries.

Returns: void

Definition at line 520 of file Database.php.

Elgg\Database::enableQueryCache ( )

Enable the query cache.

This does not take precedence over the setting.

Returns: void

Definition at line 508 of file Database.php.

Elgg\Database::executeDelayedQueries ( )

Trigger all queries that were registered as "delayed" queries.

This is called by the system automatically on shutdown.

Returns: void

Definition at line 480 of file Database.php.

Elgg\Database::executeQuery ( QueryBuilder $query )

protected

Execute a query.

$query is executed via Connection::query. If there is an SQL error, a DatabaseException is thrown.

Parameters

QueryBuilder $query The query

Returns: Result|int The result of the query

Exceptions

DatabaseException

Definition at line 400 of file Database.php.

Elgg\Database::fingerprintCallback ( $callback )

protected

Get a string that uniquely identifies a callback during the current request.

This is used to cache queries whose results were transformed by the callback. If the callback involves object method calls of the same class, different instances will return different values.

Parameters

callable $callback The callable value to fingerprint

Returns: string A string that is unique for each callable passed in

Since: 1.9.4

Definition at line 307 of file Database.php.

Elgg\Database::getConnection ( string $type )

Gets (if required, also creates) a DB connection.

Parameters

string $type The type of link we want: "read", "write" or "readwrite".

Returns: Connection

Definition at line 120 of file Database.php.

Elgg\Database::getData	(	QueryBuilder	$query,
			$callback = `null`
	)

Retrieve rows from the database.

Queries are executed with Elgg\Database::executeQuery()andresultsareretrievedwith@link\PDO::fetchObject().Ifacallbackfunction$callbackisdefined,eachrowwillbepassedasasingleargumentto$callback.Ifnocallbackfunctionisdefined,theentireresultsetisreturnedasanarray.@paramQueryBuilder$queryThequerybeingpassed.@paramcallable$callbackOptionally,thenameofafunctiontocallbacktooneachrow@returnarrayAnarrayofdatabaseresultobjectsorcallbackfunctionresults.Ifthequeryreturnednothing,anemptyarray.

Definition at line 207 of file Database.php.

Elgg\Database::getDataRow	(	QueryBuilder	$query,
			$callback = `null`
	)

Retrieve a single row from the database.

Similar to Elgg\Database::getData()butreturnsonlythefirstrowmatched.Ifacallbackfunction$callbackisspecified,therowwillbepassedastheonlyargumentto$callback.@paramQueryBuilder$queryThequerytoexecute.@paramcallable$callbackAcallbackfunctiontoapplytotherow@returnmixedAsingledatabaseresultobjectortheresultofthecallbackfunction.

Definition at line 223 of file Database.php.

Elgg\Database::getQueryCount ( )

Get the number of queries made to the database.

Returns: int

Definition at line 529 of file Database.php.

Elgg\Database::getResults	(	QueryBuilder	$query,
			$callback = `null`,
		bool	$single = `false`
	)

protected

Handles queries that return results, running the results through a an optional callback function.

This is for R queries (from CRUD).

Parameters

QueryBuilder	$query	The select query to execute
callable	$callback	An optional callback function to run on each row
bool	$single	Return only a single result?

Returns: array| An array of database result objects or callback function results. If the query returned nothing, an empty array.

Exceptions

RuntimeException

Definition at line 340 of file Database.php.

Elgg\Database::getServerVersion ( string $type = DbConfig::READ_WRITE )

Get the server version number.

Parameters

string $type Connection type (Config constants, e.g. Config::READ_WRITE)

Returns: string Empty if version cannot be determined

Definition at line 540 of file Database.php.

Elgg\Database::insertData ( QueryBuilder $query )

Insert a row into the database.

Note: Altering the DB invalidates all queries in the query cache.

Parameters

QueryBuilder $query The query to execute.

Returns: int The database id of the inserted row if a AUTO_INCREMENT field is defined, 0 if not

Definition at line 236 of file Database.php.

Elgg\Database::isMariaDB ( string $type = DbConfig::READ_WRITE )

Is the database MariaDB.

Parameters

string $type Connection type (Config constants, e.g. Config::READ_WRITE)

Returns: bool if MariaDB is detected

Definition at line 564 of file Database.php.

Elgg\Database::registerDelayedQuery	(	QueryBuilder	$query,
			$callback = `null`
	)

Queue a query for execution upon shutdown.

You can specify a callback if you care about the result. This function will always be passed a .

Parameters

QueryBuilder	$query	The query to execute
callable	$callback	A callback function to pass the results array to

Returns: void

Definition at line 467 of file Database.php.

Elgg\Database::resetConnections ( DbConfig $config )

Reset the connections with new credentials.

Parameters

DbConfig $config DB config

Returns: void

Definition at line 88 of file Database.php.

Elgg\Database::setupConnections ( )

Establish database connections.

If the configuration has been set up for multiple read/write databases, set those links up separately; otherwise just create the one database link.

Returns: void

Definition at line 140 of file Database.php.

Elgg\Database::trackQuery	(	QueryBuilder	$query,
		callable	$callback
	)

Tracks the query count and timers for a given query.

Parameters

QueryBuilder	$query	The query
callable	$callback	Callback to execyte during query execution

Returns: mixed

Definition at line 429 of file Database.php.

Elgg\Database::updateData	(	QueryBuilder	$query,
		bool	$get_num_rows = `false`
	)

Update the database.

Note: Altering the DB invalidates all queries in the query cache.

Parameters

QueryBuilder	$query	The query to run.
bool	$get_num_rows	Return the number of rows affected (default: false).

Returns: bool|int

Definition at line 259 of file Database.php.

Member Data Documentation

Elgg\Database::$delayed_queries = []

protected

Definition at line 62 of file Database.php.

Elgg\Database::$query_cache

protected

Definition at line 53 of file Database.php.

const Elgg\Database::DELAYED_HANDLER = 'h'

Definition at line 31 of file Database.php.

const Elgg\Database::DELAYED_QUERY = 'q'

Definition at line 30 of file Database.php.

The documentation for this class was generated from the following file:

engine/classes/Elgg/Database.php

Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation