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<?php
namespace DDDBL;
/**
* @returns (PDO) - reference to PDO object
* @returns (boolean) false, if there is no connection to the database
*
* if there is a connection to the database,
* the PDO object is returned otherwise false
*
**/
function getDB() {
if(!isConnected())
return false;
$objDB = getDBDataObject();
return $objDB->get('PDO');
}
/**
* @returns (boolean) true, if connection exists or is established
* @returns (boolean) false, if connection could not be established
*
* if no connection to the database exists, establishe one.
*
**/
function connect() {
if(isConnected())
return true;
$objDB = getDBDataObject();
try {
$objPDO = new \PDO($objDB->get('CONNECTION'),
$objDB->get('USER'),
$objDB->get('PASS'));
} catch (\Exception $objException) {
return false;
}
$objDB->update(array('PDO' => $objPDO));
return true;
}
/**
* disconnect from the database
*
**/
function disconnect() {
$objDB = getDBDataObject();
$objPDO = $objDB->get('PDO');
$objPDO = null;
$objDB->delete('PDO');
}
/**
* check if a connection to the database is established
*
**/
function isConnected() {
$objDB = getDBDataObject();
if(!$objDB->exists('PDO'))
return false;
return true;
}
/**
* @returns (boolean) true, if transaction started
* @returns (boolean) false, if transaction could not be started
* @returns (boolean) false, if no connection to database exists
*
* start a transaction
*
**/
function startTransaction() {
return mapMethod('beginTransaction');
}
/**
* @returns (boolean) true, if there is an active transaction
* @returns (boolean) false, if there is no active transaction
* @returns (boolean) false, if no connection to database exists
*
* check if there is an active transaction
*
**/
function inTransaction() {
return mapMethod('inTransaction');
}
/**
* @returns (boolean) true, if rollback was successfull
* @returns (boolean) false, if rollback was not successfull
* @returns (boolean) false, if no connection to database exists
*
* perform a rollback of the active transaction
*
**/
function rollback() {
return mapMethod('rollback');
}
/**
* @returns (boolean) true, if commit was successfull
* @returns (boolean) false, if commit was not successfull
* @returns (boolean) false, if no connection to database exists
*
* commit the active transaction
*
**/
function commit() {
return mapMethod('commit');
}
/**
* @returns (array) - list of error-information
*
* get information about an error
*
**/
function getErrorInfo() {
return mapMethod('errorInfo');
}
/**
* change the active database-connection. all db-functions
* are performed at the new connection.
*
* ATTENTION: the old connection is *not* closed!
*
**/
function changeDB($strIdentifier) {
$objDataObjectPool = new DataObjectPool('Database-Definition');
$objNewDB = $objDataObjectPool->get($strIdentifier);
$objDataObjectPool->delete('DEFAULT');
$objDataObjectPool->add('DEFAULT', $objNewDB->getAll());
}
/**
* @returns (DataObject) - reference to the DataObject of default connection
*
* returns the DataObject of the default connection.
*
**/
function getDBDataObject() {
$objDataObjectPool = new DataObjectPool('Database-Definition');
return $objDataObjectPool->get('DEFAULT');
}
/**
* @throws UnexpectedParameterTypeException - if the given parameter is not a string
*
* @returns (boolean) false, if no connection is established
*
* check if a connection to the database is established. if so,
* the given parameter is used, as method to call at the
* PDO object. the result of the call is returned
*
**/
function mapMethod($strMethod) {
if(!is_string($strMethod))
throw new UnexpectedParameterTypeException('string', $strMethod);
if(!isConnected())
return false;
$objDB = getDBDataObject();
$objPDO = $objDB->get('PDO');
return $objPDO->$strMethod();
}