dsn)) { $this->dsn = 'oci:dbname='; // Oracle has a slightly different PDO DSN format (Easy Connect), // which also supports pre-defined DSNs. if (empty($this->hostname) && empty($this->port)) { $this->dsn .= $this->database; } else { $this->dsn .= '//'.(empty($this->hostname) ? '127.0.0.1' : $this->hostname) .(empty($this->port) ? '' : ':'.$this->port).'/'; empty($this->database) OR $this->dsn .= $this->database; } empty($this->char_set) OR $this->dsn .= ';charset='.$this->char_set; } elseif ( ! empty($this->char_set) && strpos($this->dsn, 'charset=', 4) === FALSE) { $this->dsn .= ';charset='.$this->char_set; } } // -------------------------------------------------------------------- /** * Show table query * * Generates a platform-specific query string so that the table names can be fetched * * @param bool * @return string */ protected function _list_tables($prefix_limit = FALSE) { $sql = 'SELECT "TABLE_NAME" FROM "ALL_TABLES"'; if ($prefix_limit === TRUE && $this->dbprefix !== '') { return $sql.' WHERE "TABLE_NAME" LIKE \''.$this->escape_like_str($this->dbprefix)."%' " .sprintf($this->_like_escape_str, $this->_like_escape_chr); } return $sql; } // -------------------------------------------------------------------- /** * Show column query * * Generates a platform-specific query string so that the column names can be fetched * * @param string the table name * @return string */ protected function _list_columns($table = '') { return 'SELECT "COLUMN_NAME" FROM "all_tab_columns" WHERE "TABLE_NAME" = '.$this->escape($table); } // -------------------------------------------------------------------- /** * Field data query * * Generates a platform-specific query so that the column data can be retrieved * * @param string the table name * @return string */ protected function _field_data($table) { return 'SELECT * FROM '.$this->protect_identifiers($table).' WHERE rownum = 1'; } // -------------------------------------------------------------------- /** * From Tables * * This function implicitly groups FROM tables so there is no confusion * about operator precedence in harmony with SQL standards * * @param array * @return string */ protected function _from_tables($tables) { return is_array($tables) ? implode(', ', $tables) : $tables; } // -------------------------------------------------------------------- /** * Insert_batch statement * * @param string the table name * @param array the insert keys * @param array the insert values * @return string */ protected function _insert_batch($table, $keys, $values) { $keys = implode(', ', $keys); $sql = "INSERT ALL\n"; for ($i = 0, $c = count($values); $i < $c; $i++) { $sql .= ' INTO '.$table.' ('.$keys.') VALUES '.$values[$i]."\n"; } return $sql.'SELECT * FROM dual'; } // -------------------------------------------------------------------- /** * Delete statement * * Generates a platform-specific delete string from the supplied data * * @param string the table name * @param array the where clause * @param array the like clause * @param string the limit clause * @return string */ protected function _delete($table, $where = array(), $like = array(), $limit = FALSE) { $conditions = array(); empty($where) OR $conditions[] = implode(' ', $where); empty($like) OR $conditions[] = implode(' ', $like); empty($limit) OR $conditions[] = 'rownum <= '.$limit; return 'DELETE FROM '.$table.(count($conditions) > 0 ? ' WHERE '.implode(' AND ', $conditions) : ''); } // -------------------------------------------------------------------- /** * Limit string * * Generates a platform-specific LIMIT clause * * @param string the sql query string * @param int the number of rows to limit the query to * @param int the offset value * @return string */ protected function _limit($sql, $limit, $offset) { return 'SELECT * FROM (SELECT inner_query.*, rownum rnum FROM ('.$sql.') inner_query WHERE rownum < '.($offset + $limit + 1).')' .($offset ? ' WHERE rnum >= '.($offset + 1): ''); } } /* End of file pdo_oci_driver.php */ /* Location: ./system/database/drivers/pdo/subdrivers/pdo_oci_driver.php */