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<?php /** * File containing the ezcDbHandler class. * * @package Database * @version 1.4.7 * @copyright Copyright (C) 2005-2010 eZ Systems AS. All rights reserved. * @license http://ez.no/licenses/new_bsd New BSD License / /* * Defines interface for all the database drivers implementations. * * ezcDbHandler provides some functionality that is not present in PDO. * - handling of offset/limit in a datbase independent way * - correct recursive handling of transactions * * @version 1.4.7 * @package Database * @mainclass / abstract class ezcDbHandler extends PDO { /* * Stores the transaction nesting level. * * @var int / protected $transactionNestingLevel = 0; /* * This flag is set to true when an SQL query has failed. * In this case the transaction should be rolled back. * * @var bool / protected $transactionErrorFlag = false; /* * Characters to quote identifiers with. Should be overwritten in handler * implementation, if different for a specific handler. In some cases the * quoting start and end characters differ (e.g. ODBC), but mostly they are * the same. * * @var string / protected $identifierQuoteChars = array( "start" => '"', "end" => '"', ); /* * Constructs a handler object. * * note: Remember to always call this constructor from constructor of a derived class! * * @see PDO::__construct() * @param array $dbParams Misc database connection parameters. * @param string $dsn Data Source Name, generated by constructor * of a derived class. / public function __construct( $dbParams, $dsn ) { $user = null; $pass = null; $driverOptions = null; foreach ( $dbParams as $key => $val ) { switch ( $key ) { case 'user': case 'username': $user = $val; break; case 'pass': case 'password': $pass = $val; break; case 'driver-opts': $driverOptions = $val; break; } } parent::__construct( $dsn, $user, $pass, $driverOptions ); $this->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION ); $this->setAttribute( PDO::ATTR_CASE, PDO::CASE_LOWER ); } /* * Returns the name of the handler. * * Returns handler name * (e.g. 'mysql', 'pgsql', 'oracle', etc.) * * This method can be used to choose more optimal query * for the given Database. * * note This is commented out because it breaks with PHP 5.2. * * @return string / // abstract static public function getName(); /* * Returns true if the given $feature is supported by the handler. * * Derived classes should override this method to report * the features they support. * * @apichange Never implemented properly, no good use (See #10937) * @ignore * @param string $feature * @return bool / static public function hasFeature( $feature ) { return false; } /* * Begins a transaction. * * This method executes a begin transaction query unless a * transaction has already been started (transaction nesting level > 0 ) * * Each call to beginTransaction() must have a corresponding commit() or * rollback() call. * * @see commit() * @see rollback() * @return bool / #[ReturnTypeWillChange] public function beginTransaction() { $retval = true; if ( $this->transactionNestingLevel == 0 ) { $retval = parent::beginTransaction(); } // else NOP $this->transactionNestingLevel++; return $retval; } /* * Commits a transaction. * * If this this call to commit corresponds to the outermost call to * beginTransaction() and all queries within this transaction were * successful, a commit query is executed. If one of the queries returned * with an error, a rollback query is executed instead. * * This method returns true if the transaction was successful. If the * transaction failed and rollback was called, false is returned. * * @see beginTransaction() * @see rollback() * @return bool / #[ReturnTypeWillChange] public function commit() { if ( $this->transactionNestingLevel <= 0 ) { $this->transactionNestingLevel = 0; throw new ezcDbTransactionException( "commit() called before beginTransaction()." ); } $retval = true; if ( $this->transactionNestingLevel == 1 ) { if ( $this->transactionErrorFlag ) { parent::rollback(); $this->transactionErrorFlag = false; // reset error flag $retval = false; } else { parent::commit(); } } // else NOP $this->transactionNestingLevel--; return $retval; } /* * Rollback a transaction. * * If this this call to rollback corresponds to the outermost call to * beginTransaction(), a rollback query is executed. If this is an inner * transaction (nesting level > 1) the error flag is set, leaving the * rollback to the outermost transaction. * * This method always returns true. * * @see beginTransaction() * @see commit() * @return bool / #[ReturnTypeWillChange] public function rollback() { if ( $this->transactionNestingLevel <= 0 ) { $this->transactionNestingLevel = 0; throw new ezcDbTransactionException( "rollback() called without previous beginTransaction()." ); } if ( $this->transactionNestingLevel == 1 ) { parent::rollback(); $this->transactionErrorFlag = false; // reset error flag } else { // set the error flag, so that if there is outermost commit // then ROLLBACK will be done instead of COMMIT $this->transactionErrorFlag = true; } $this->transactionNestingLevel--; return true; } /* * Returns a new ezcQuerySelect derived object for the correct database type. * * @return ezcQuerySelect / public function createSelectQuery() { return new ezcQuerySelect( $this ); } /* * Returns a new ezcQueryUpdate derived object for the correct database type. * * @return ezcQueryUpdate / public function createUpdateQuery() { return new ezcQueryUpdate( $this ); } /* * Returns a new ezcQueryInsert derived object for the correct database type. * * @return ezcQueryInsert / public function createInsertQuery() { return new ezcQueryInsert( $this ); } /* * Returns a new ezcQueryDelete derived object for the correct database type. * * @return ezcQueryDelete / public function createDeleteQuery() { return new ezcQueryDelete( $this ); } /* * Returns a new ezcQueryExpression derived object for the correct database type. * * @return ezcQueryExpression / public function createExpression() { return new ezcQueryExpression( $this ); } /* * Returns a new ezcUtilities derived object for the correct database type. * * @return ezcDbUtilities / public function createUtilities() { return new ezcDbUtilities( $this ); } /* * Returns the quoted version of an identifier to be used in an SQL query. * This method takes a given identifier and quotes it, so it can safely be * used in SQL queries. * * @param string $identifier The identifier to quote. * @return string The quoted identifier. */ public function quoteIdentifier( $identifier ) { if ( sizeof( $this->identifierQuoteChars ) === 2 ) { $identifier = $this->identifierQuoteChars["start"] . str_replace( $this->identifierQuoteChars["end"], $this->identifierQuoteChars["end"].$this->identifierQuoteChars["end"], $identifier ) . $this->identifierQuoteChars["end"]; } return $identifier; } } ?>

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