diff options
Diffstat (limited to 'phpBB/phpbb/db/driver/oracle.php')
| -rw-r--r-- | phpBB/phpbb/db/driver/oracle.php | 803 |
1 files changed, 803 insertions, 0 deletions
diff --git a/phpBB/phpbb/db/driver/oracle.php b/phpBB/phpbb/db/driver/oracle.php new file mode 100644 index 0000000000..e21e07055d --- /dev/null +++ b/phpBB/phpbb/db/driver/oracle.php @@ -0,0 +1,803 @@ +<?php +/** +* +* @package dbal +* @copyright (c) 2005 phpBB Group +* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2 +* +*/ + +/** +* @ignore +*/ +if (!defined('IN_PHPBB')) +{ + exit; +} + +/** +* Oracle Database Abstraction Layer +* @package dbal +*/ +class phpbb_db_driver_oracle extends phpbb_db_driver +{ + var $last_query_text = ''; + var $connect_error = ''; + + /** + * Connect to server + */ + function sql_connect($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 : '') . '/' . $database; + } + + if ($new_link) + { + if (!function_exists('ocinlogon')) + { + $this->connect_error = 'ocinlogon function does not exist, is oci extension installed?'; + return $this->sql_error(''); + } + $this->db_connect_id = @ocinlogon($this->user, $sqlpassword, $connect, 'UTF8'); + } + else if ($this->persistency) + { + if (!function_exists('ociplogon')) + { + $this->connect_error = 'ociplogon function does not exist, is oci extension installed?'; + return $this->sql_error(''); + } + $this->db_connect_id = @ociplogon($this->user, $sqlpassword, $connect, 'UTF8'); + } + else + { + if (!function_exists('ocilogon')) + { + $this->connect_error = 'ocilogon function does not exist, is oci extension installed?'; + return $this->sql_error(''); + } + $this->db_connect_id = @ocilogon($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 + * @param bool $use_cache forced to false for Oracle + * @return string sql server version + */ + function sql_server_info($raw = false, $use_cache = true) + { + /** + * force $use_cache false. I didn't research why the caching code below is commented out + * but I assume its because the Oracle extension provides a direct method to access it + * without a query. + */ + + $use_cache = 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*(?:(=|<[=>]?|>=?|LIKE)\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')) + { + $this->sql_report('start', $query); + } + + $this->last_query_text = $query; + $this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($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[^(]++\\((.*?)\\)$/sU', $query, $regs)) + { + if (strlen($regs[3]) > 4000) + { + $cols = explode(', ', $regs[2]); + + preg_match_all('/\'(?:[^\']++|\'\')*+\'|[\d-.]+/', $regs[3], $vals, PREG_PATTERN_ORDER); + +/* The code inside this comment block breaks clob handling, but does allow the + database restore script to work. If you want to allow no posts longer than 4KB + and/or need the db restore script, uncomment this. + + + if (sizeof($cols) !== sizeof($vals)) + { + // Try to replace some common data we know is from our restore script or from other sources + $regs[3] = str_replace("'||chr(47)||'", '/', $regs[3]); + $_vals = explode(', ', $regs[3]); + + $vals = array(); + $is_in_val = false; + $i = 0; + $string = ''; + + foreach ($_vals as $value) + { + if (strpos($value, "'") === false && !$is_in_val) + { + $vals[$i++] = $value; + continue; + } + + if (substr($value, -1) === "'") + { + $vals[$i] = $string . (($is_in_val) ? ', ' : '') . $value; + $string = ''; + $is_in_val = false; + + if ($vals[$i][0] !== "'") + { + $vals[$i] = "''" . $vals[$i]; + } + $i++; + continue; + } + else + { + $string .= (($is_in_val) ? ', ' : '') . $value; + $is_in_val = true; + } + } + + if ($string) + { + // New value if cols != value + $vals[(sizeof($cols) !== sizeof($vals)) ? $i : $i - 1] .= $string; + } + + $vals = array(0 => $vals); + } +*/ + + $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')) + { + $this->sql_report('stop', $query); + } + + if ($cache && $cache_ttl) + { + $this->open_queries[(int) $this->query_result] = $this->query_result; + $this->query_result = $cache->sql_save($this, $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')) + { + $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 = $this->query_result; + } + + if ($cache && $cache->sql_exists($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 = $this->query_result; + } + + if ($cache && $cache->sql_exists($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 = $this->query_result; + } + + if ($cache && $cache->sql_exists($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 $data; + } + + function _sql_bit_and($column_name, $bit, $compare = '') + { + return 'BITAND(' . $column_name . ', ' . (1 << $bit) . ')' . (($compare) ? ' ' . $compare : ''); + } + + function _sql_bit_or($column_name, $bit, $compare = '') + { + return 'BITOR(' . $column_name . ', ' . (1 << $bit) . ')' . (($compare) ? ' ' . $compare : ''); + } + + /** + * return sql error array + * @access private + */ + function _sql_error() + { + if (function_exists('ocierror')) + { + $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(); + } + } + else + { + $error = array( + 'message' => $this->connect_error, + 'code' => '', + ); + } + + 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 .= '</table>'; + } + + 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; + } + } +} |