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