/**

*

* @package dbal

* @version $Id: oracle.php 9175 2008-12-05 11:18:59Z acydburn $

* @copyright (c) 2005 phpBB Group

* @license http://opensource.org/licenses/gpl-license.php GNU Public License

*

*/

/**

* @ignore

*/

if (!defined('IN_PHPBB'))

{

	exit;

}

include_once($phpbb_root_path . 'includes/db/dbal.' . $phpEx);

/**

* Oracle Database Abstraction Layer

* @package dbal

*/

class dbal_oracle extends dbal

{

	var $last_query_text = '';

	/**

	* Connect to server

	*/

	function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)

	{

		$this->persistency = $persistency;

		$this->user = $sqluser;

		$this->server = $sqlserver . (($port) ? ':' . $port : '');

		$this->dbname = $database;

		$connect = $database;

		// support for "easy connect naming"

		if ($sqlserver !== '' && $sqlserver !== '/')

		{

			if (substr($sqlserver, -1, 1) == '/')

			{

				$sqlserver == substr($sqlserver, 0, -1);

			}

			$connect = $sqlserver . (($port) ? ':' . $port : '') . '/' . $database;

		}

		$this->db_connect_id = ($new_link) ? @ocinlogon($this->user, $sqlpassword, $connect, 'UTF8') : (($this->persistency) ? @ociplogon($this->user, $sqlpassword, $connect, 'UTF8') : @ocilogon($this->user, $sqlpassword, $connect, 'UTF8'));

		return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');

	}

	/**

	* Version information about used database

	* @param bool $raw if true, only return the fetched sql_server_version

	* @return string sql server version

	*/

	function sql_server_info($raw = false)

	{

/*

		global $cache;

		if (empty($cache) || ($this->sql_server_version = $cache->get('oracle_version')) === false)

		{

			$result = @ociparse($this->db_connect_id, 'SELECT * FROM v$version WHERE banner LIKE \'Oracle%\'');

			@ociexecute($result, OCI_DEFAULT);

			@ocicommit($this->db_connect_id);

			$row = array();

			@ocifetchinto($result, $row, OCI_ASSOC + OCI_RETURN_NULLS);

			@ocifreestatement($result);

			$this->sql_server_version = trim($row['BANNER']);

			$cache->put('oracle_version', $this->sql_server_version);

		}

*/

		$this->sql_server_version = @ociserverversion($this->db_connect_id);

		return $this->sql_server_version;

	}

	/**

	* SQL Transaction

	* @access private

	*/

	function _sql_transaction($status = 'begin')

	{

		switch ($status)

		{

			case 'begin':

				return true;

			break;

			case 'commit':

				return @ocicommit($this->db_connect_id);

			break;

			case 'rollback':

				return @ocirollback($this->db_connect_id);

			break;

		}

		return true;

	}

	/**

	* Oracle specific code to handle the fact that it does not compare columns properly

	* @access private

	*/

	function _rewrite_col_compare($args)

	{

		if (sizeof($args) == 4)

		{

			if ($args[2] == '=')

			{

				return '(' . $args[0] . ' OR (' . $args[1] . ' is NULL AND ' . $args[3] . ' is NULL))';

			}

			else if ($args[2] == '<>')

			{

				// really just a fancy way of saying foo <> bar or (foo is NULL XOR bar is NULL) but SQL has no XOR :P

				return '(' . $args[0] . ' OR ((' . $args[1] . ' is NULL AND ' . $args[3] . ' is NOT NULL) OR (' . $args[1] . ' is NOT NULL AND ' . $args[3] . ' is NULL)))';

			}

		}

		else

		{

			return $this->_rewrite_where($args[0]);

		}

	}

	/**

	* Oracle specific code to handle it's lack of sanity

	* @access private

	*/

	function _rewrite_where($where_clause)

	{

		preg_match_all('/\s*(AND|OR)?\s*([\w_.]++)\s*(?:(=|<[=>]?|>=?)\s*((?>\'(?>[^\']++|\'\')*+\'|[\d-.]+))|((NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]+,? ?)*+\)))/', $where_clause, $result, PREG_SET_ORDER);

		$out = '';

		foreach ($result as $val)

		{

			if (!isset($val[5]))

			{

				if ($val[4] !== "''")

				{

					$out .= $val[0];

				}

				else

				{

					$out .= ' ' . $val[1] . ' ' . $val[2];

					if ($val[3] == '=')

					{

						$out .= ' is NULL';

					}

					else if ($val[3] == '<>')

					{

						$out .= ' is NOT NULL';

					}

				}

			}

			else

			{

				$in_clause = array();

				$sub_exp = substr($val[5], strpos($val[5], '(') + 1, -1);

				$extra = false;

				preg_match_all('/\'(?>[^\']++|\'\')*+\'|[\d-.]++/', $sub_exp, $sub_vals, PREG_PATTERN_ORDER);

				$i = 0;

				foreach ($sub_vals[0] as $sub_val)

				{

					// two things:

					// 1) This determines if an empty string was in the IN clausing, making us turn it into a NULL comparison

					// 2) This fixes the 1000 list limit that Oracle has (ORA-01795)

					if ($sub_val !== "''")

					{

						$in_clause[(int) $i++/1000][] = $sub_val;

					}

					else

					{

						$extra = true;

					}

				}

				if (!$extra && $i < 1000)

				{

					$out .= $val[0];

				}

				else

				{

					$out .= ' ' . $val[1] . '(';

					$in_array = array();

					// constuct each IN() clause

					foreach ($in_clause as $in_values)

					{

						$in_array[] = $val[2] . ' ' . (isset($val[6]) ? $val[6] : '') . 'IN(' . implode(', ', $in_values) . ')';

					}

					// Join the IN() clauses against a few ORs (IN is just a nicer OR anyway)

					$out .= implode(' OR ', $in_array);

					// handle the empty string case

					if ($extra)

					{

						$out .= ' OR ' . $val[2] . ' is ' . (isset($val[6]) ? $val[6] : '') . 'NULL';

					}

					$out .= ')';

					unset($in_array, $in_clause);

				}

			}

		}

		return $out;

	}

	/**

	* Base query method

	*

	* @param	string	$query		Contains the SQL query which shall be executed

	* @param	int		$cache_ttl	Either 0 to avoid caching or the time in seconds which the result shall be kept in cache

	* @return	mixed				When casted to bool the returned value returns true on success and false on failure

	*

	* @access	public

	*/

	function sql_query($query = '', $cache_ttl = 0)

	{

		if ($query != '')

		{

			global $cache;

			// EXPLAIN only in extra debug mode

			if (defined('DEBUG_EXTRA'))

			{

				$this->sql_report('start', $query);

			}

			$this->last_query_text = $query;

			$this->query_result = ($cache_ttl && method_exists($cache, 'sql_load')) ? $cache->sql_load($query) : false;

			$this->sql_add_num_queries($this->query_result);

			if ($this->query_result === false)

			{

				$in_transaction = false;

				if (!$this->transaction)

				{

					$this->sql_transaction('begin');

				}

				else

				{

					$in_transaction = true;

				}

				$array = array();

				// We overcome Oracle's 4000 char limit by binding vars

				if (strlen($query) > 4000)

				{

					if (preg_match('/^(INSERT INTO[^(]++)\\(([^()]+)\\) VALUES[^(]++\\((.*?)\\)$/s', $query, $regs))

					{

						if (strlen($regs[3]) > 4000)

						{

							$cols = explode(', ', $regs[2]);

							preg_match_all('/\'(?:[^\']++|\'\')*+\'|[\d-.]+/', $regs[3], $vals, PREG_PATTERN_ORDER);

							$inserts = $vals[0];

							unset($vals);

							foreach ($inserts as $key => $value)

							{

								if (!empty($value) && $value[0] === "'" && strlen($value) > 4002) // check to see if this thing is greater than the max + 'x2

								{

									$inserts[$key] = ':' . strtoupper($cols[$key]);

									$array[$inserts[$key]] = str_replace("''", "'", substr($value, 1, -1));

								}

							}

							$query = $regs[1] . '(' . $regs[2] . ') VALUES (' . implode(', ', $inserts) . ')';

						}

					}

					else if (preg_match_all('/^(UPDATE [\\w_]++\\s+SET )([\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+)(?:,\\s*[\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+))*+)\\s+(WHERE.*)$/s', $query, $data, PREG_SET_ORDER))

					{

						if (strlen($data[0][2]) > 4000)

						{

							$update = $data[0][1];

							$where = $data[0][3];

							preg_match_all('/([\\w_]++)\\s*=\\s*(\'(?:[^\']++|\'\')*+\'|[\d-.]++)/', $data[0][2], $temp, PREG_SET_ORDER);

							unset($data);

							$cols = array();

							foreach ($temp as $value)

							{

								if (!empty($value[2]) && $value[2][0] === "'" && strlen($value[2]) > 4002) // check to see if this thing is greater than the max + 'x2

								{

									$cols[] = $value[1] . '=:' . strtoupper($value[1]);

									$array[$value[1]] = str_replace("''", "'", substr($value[2], 1, -1));

								}

								else

								{

									$cols[] = $value[1] . '=' . $value[2];

								}

							}

							$query = $update . implode(', ', $cols) . ' ' . $where;

							unset($cols);

						}

					}

				}

				switch (substr($query, 0, 6))

				{

					case 'DELETE':

						if (preg_match('/^(DELETE FROM [\w_]++ WHERE)((?:\s*(?:AND|OR)?\s*[\w_]+\s*(?:(?:=|<>)\s*(?>\'(?>[^\']++|\'\')*+\'|[\d-.]+)|(?:NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]+,? ?)*+\)))*+)$/', $query, $regs))

						{

							$query = $regs[1] . $this->_rewrite_where($regs[2]);

							unset($regs);

						}

					break;

					case 'UPDATE':

						if (preg_match('/^(UPDATE [\\w_]++\\s+SET [\\w_]+\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]++|:\w++)(?:, [\\w_]+\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]++|:\w++))*+\\s+WHERE)(.*)$/s',  $query, $regs))

						{

							$query = $regs[1] . $this->_rewrite_where($regs[2]);

							unset($regs);

						}

					break;

					case 'SELECT':

						$query = preg_replace_callback('/([\w_.]++)\s*(?:(=|<>)\s*(?>\'(?>[^\']++|\'\')*+\'|[\d-.]++|([\w_.]++))|(?:NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]++,? ?)*+\))/', array($this, '_rewrite_col_compare'), $query);

					break;

				}

				$this->query_result = @ociparse($this->db_connect_id, $query);

				foreach ($array as $key => $value)

				{

					@ocibindbyname($this->query_result, $key, $array[$key], -1);

				}

				$success = @ociexecute($this->query_result, OCI_DEFAULT);

				if (!$success)

				{

					$this->sql_error($query);

					$this->query_result = false;

				}

				else

				{

					if (!$in_transaction)

					{

						$this->sql_transaction('commit');

					}

				}

				if (defined('DEBUG_EXTRA'))

				{

					$this->sql_report('stop', $query);

				}

				if ($cache_ttl && method_exists($cache, 'sql_save'))

				{

					$this->open_queries[(int) $this->query_result] = $this->query_result;

					$cache->sql_save($query, $this->query_result, $cache_ttl);

				}

				else if (strpos($query, 'SELECT') === 0 && $this->query_result)

				{

					$this->open_queries[(int) $this->query_result] = $this->query_result;

				}

			}

			else if (defined('DEBUG_EXTRA'))

			{

				$this->sql_report('fromcache', $query);

			}

		}

		else

		{

			return false;

		}

		return $this->query_result;

	}

	/**

	* Build LIMIT query

	*/

	function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)

	{

		$this->query_result = false;

		$query = 'SELECT * FROM (SELECT /*+ FIRST_ROWS */ rownum AS xrownum, a.* FROM (' . $query . ') a WHERE rownum <= ' . ($offset + $total) . ') WHERE xrownum >= ' . $offset;

		return $this->sql_query($query, $cache_ttl);

	}

	/**

	* Return number of affected rows

	*/

	function sql_affectedrows()

	{

		return ($this->query_result) ? @ocirowcount($this->query_result) : false;

	}

	/**

	* Fetch current row

	*/

	function sql_fetchrow($query_id = false)

	{

		global $cache;

		if ($query_id === false)

		{

			$query_id = $this->query_result;

		}

		if (isset($cache->sql_rowset[$query_id]))

		{

			return $cache->sql_fetchrow($query_id);

		}

		if ($query_id !== false)

		{

			$row = array();

			$result = @ocifetchinto($query_id, $row, OCI_ASSOC + OCI_RETURN_NULLS);

			if (!$result || !$row)

			{

				return false;

			}

			$result_row = array();

			foreach ($row as $key => $value)

			{

				// Oracle treats empty strings as null

				if (is_null($value))

				{

					$value = '';

				}

				// OCI->CLOB?

				if (is_object($value))

				{

					$value = $value->load();

				}

				$result_row[strtolower($key)] = $value;

			}

			return $result_row;

		}

		return false;

	}

	/**

	* Seek to given row number

	* rownum is zero-based

	*/

	function sql_rowseek($rownum, &$query_id)

	{

		global $cache;

		if ($query_id === false)

		{

			$query_id = $this->query_result;

		}

		if (isset($cache->sql_rowset[$query_id]))

		{

			return $cache->sql_rowseek($rownum, $query_id);

		}

		if ($query_id === false)

		{

			return false;

		}

		// Reset internal pointer

		@ociexecute($query_id, OCI_DEFAULT);

		// We do not fetch the row for rownum == 0 because then the next resultset would be the second row

		for ($i = 0; $i < $rownum; $i++)

		{

			if (!$this->sql_fetchrow($query_id))

			{

				return false;

			}

		}

		return true;

	}

	/**

	* Get last inserted id after insert statement

	*/

	function sql_nextid()

	{

		$query_id = $this->query_result;

		if ($query_id !== false && $this->last_query_text != '')

		{

			if (preg_match('#^INSERT[\t\n ]+INTO[\t\n ]+([a-z0-9\_\-]+)#is', $this->last_query_text, $tablename))

			{

				$query = 'SELECT ' . $tablename[1] . '_seq.currval FROM DUAL';

				$stmt = @ociparse($this->db_connect_id, $query);

				@ociexecute($stmt, OCI_DEFAULT);

				$temp_result = @ocifetchinto($stmt, $temp_array, OCI_ASSOC + OCI_RETURN_NULLS);

				@ocifreestatement($stmt);

				if ($temp_result)

				{

					return $temp_array['CURRVAL'];

				}

				else

				{

					return false;

				}

			}

		}

		return false;

	}

	/**

	* Free sql result

	*/

	function sql_freeresult($query_id = false)

	{

		global $cache;

		if ($query_id === false)

		{

			$query_id = $this->query_result;

		}

		if (isset($cache->sql_rowset[$query_id]))

		{

			return $cache->sql_freeresult($query_id);

		}

		if (isset($this->open_queries[(int) $query_id]))

		{

			unset($this->open_queries[(int) $query_id]);

			return @ocifreestatement($query_id);

		}

		return false;

	}

	/**

	* Escape string used in sql query

	*/

	function sql_escape($msg)

	{

		return str_replace(array("'", "\0"), array("''", ''), $msg);

	}

	/**

	* Build LIKE expression

	* @access private

	*/

	function _sql_like_expression($expression)

	{

		return $expression . " ESCAPE '\\'";

	}

	function _sql_custom_build($stage, $data)

	{

		return $data;

	}

	/**

	* return sql error array

	* @access private

	*/

	function _sql_error()

	{

		$error = @ocierror();

		$error = (!$error) ? @ocierror($this->query_result) : $error;

		$error = (!$error) ? @ocierror($this->db_connect_id) : $error;

		if ($error)

		{

			$this->last_error_result = $error;

		}

		else

		{

			$error = (isset($this->last_error_result) && $this->last_error_result) ? $this->last_error_result : array();

		}

		return $error;

	}

	/**

	* Close sql connection

	* @access private

	*/

	function _sql_close()

	{

		return @ocilogoff($this->db_connect_id);

	}

	/**

	* Build db-specific report

	* @access private

	*/

	function _sql_report($mode, $query = '')

	{

		switch ($mode)

		{

			case 'start':

				$html_table = false;

				// Grab a plan table, any will do

				$sql = "SELECT table_name

					FROM USER_TABLES

					WHERE table_name LIKE '%PLAN_TABLE%'";

				$stmt = ociparse($this->db_connect_id, $sql);

				ociexecute($stmt);

				$result = array();

				if (ocifetchinto($stmt, $result, OCI_ASSOC + OCI_RETURN_NULLS))

				{

					$table = $result['TABLE_NAME'];

					// This is the statement_id that will allow us to track the plan

					$statement_id = substr(md5($query), 0, 30);

					// Remove any stale plans

					$stmt2 = ociparse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'");

					ociexecute($stmt2);

					ocifreestatement($stmt2);

					// Explain the plan

					$sql = "EXPLAIN PLAN

						SET STATEMENT_ID = '$statement_id'

						FOR $query";

					$stmt2 = ociparse($this->db_connect_id, $sql);

					ociexecute($stmt2);

					ocifreestatement($stmt2);

					// Get the data from the plan

					$sql = "SELECT operation, options, object_name, object_type, cardinality, cost

						FROM plan_table

						START WITH id = 0 AND statement_id = '$statement_id'

						CONNECT BY PRIOR id = parent_id

							AND statement_id = '$statement_id'";

					$stmt2 = ociparse($this->db_connect_id, $sql);

					ociexecute($stmt2);

					$row = array();

					while (ocifetchinto($stmt2, $row, OCI_ASSOC + OCI_RETURN_NULLS))

					{

						$html_table = $this->sql_report('add_select_row', $query, $html_table, $row);

					}

					ocifreestatement($stmt2);

					// Remove the plan we just made, we delete them on request anyway

					$stmt2 = ociparse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'");

					ociexecute($stmt2);

					ocifreestatement($stmt2);

				}

				ocifreestatement($stmt);

				if ($html_table)

				{

					$this->html_hold .= '';

				}

			break;

			case 'fromcache':

				$endtime = explode(' ', microtime());

				$endtime = $endtime[0] + $endtime[1];

				$result = @ociparse($this->db_connect_id, $query);

				$success = @ociexecute($result, OCI_DEFAULT);

				$row = array();

				while (@ocifetchinto($result, $row, OCI_ASSOC + OCI_RETURN_NULLS))

				{

					// Take the time spent on parsing rows into account

				}

				@ocifreestatement($result);

				$splittime = explode(' ', microtime());

				$splittime = $splittime[0] + $splittime[1];

				$this->sql_report('record_fromcache', $query, $endtime, $splittime);

			break;

		}

	}

}

?>