+<?php

+/**

+*

+* @package dbal

+* @version $Id$

+* @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);

+

+/**

+* MSSQL Database Abstraction Layer

+* Minimum Requirement is DB2 8.2.2

+* @package dbal

+*/

+class dbal_db2 extends dbal

+{

+ var $multi_insert = true;

+ var $last_query_text = '';

+

+ // can't truncate a table

+ var $truncate = false;

+

+ /**

+ * 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;

+

+ $this->db_connect_id = ($this->persistency) ? @db2_pconnect($this->dbname, $this->user, $sqlpassword, array('autocommit' => DB2_AUTOCOMMIT_ON, 'DB2_ATTR_CASE' => DB2_CASE_LOWER)) : @db2_connect($this->dbname, $this->user, $sqlpassword, array('autocommit' => DB2_AUTOCOMMIT_ON, 'DB2_ATTR_CASE' => DB2_CASE_LOWER));

+

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

+ }

+

+ /**

+ * Version information about used database

+ */

+ function sql_server_info()

+ {

+ $info = db2_server_info($this->db_connect_id);

+ return $info->DBMS_VER;

+ }

+

+ /**

+ * SQL Transaction

+ * @access private

+ */

+ function _sql_transaction($status = 'begin')

+ {

+ switch ($status)

+ {

+ case 'begin':

+ return @db2_autocommit($this->db_connect_id, DB2_AUTOCOMMIT_OFF);

+ break;

+

+ case 'commit':

+ $result = @db2_commit($this->db_connect_id);

+ @db2_autocommit($this->db_connect_id, DB2_AUTOCOMMIT_ON);

+ return $result;

+ break;

+

+ case 'rollback':

+ $result = @db2_rollback($this->db_connect_id);

+ @db2_autocommit($this->db_connect_id, DB2_AUTOCOMMIT_ON);

+ return $result;

+ break;

+ }

+

+ return true;

+ }

+

+ /**

+ * 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)

+ {

+ $array = array();

+ if (strlen($query) > 32740)

+ {

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

+ {

+ if (strlen($regs[3]) > 32740)

+ {

+ 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) > 32742) // check to see if this thing is greater than the max + 'x2

+ {

+ $inserts[$key] = '?';

+ $array[] = str_replace("''", "'", substr($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][3]) > 32740)

+ {

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

+ $where = $data[0][4];

+ preg_match_all('/(\\w++) = (\'(?:[^\']++|\'\')*+\'|\\d++)/', $data[0][3], $temp, PREG_SET_ORDER);

+ unset($data);

+

+ $cols = array();

+ foreach ($temp as $value)

+ {

+ if (!empty($value[2]) && $value[2][0] === "'" && strlen($value[2]) > 32742) // check to see if this thing is greater than the max + 'x2

+ {

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

+ $cols[] = $value[1] . '=?';

+ }

+ else

+ {

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

+ }

+ }

+

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

+ unset($cols);

+ }

+ }

+ }

+

+ if (sizeof($array))

+ {

+ if (($this->query_result = @db2_prepare($this->db_connect_id, $query)) === false)

+ {

+ $this->sql_error($query);

+ }

+

+ if (!@db2_execute($this->query_result, $array))

+ {

+ $this->sql_error($query);

+ }

+ }

+ else

+ {

+ if (($this->query_result = @db2_exec($this->db_connect_id, $query)) === false)

+ {

+ $this->sql_error($query);

+ }

+ }

+

+ 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) ? $this->query_result : false;

+ }

+

+ /**

+ * Build LIMIT query

+ */

+ function sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)

+ {

+ if ($query != '')

+ {

+ $this->query_result = false;

+

+ if ($total && $offset == 0)

+ {

+ return $this->sql_query($query . ' fetch first ' . $total . ' rows only', $cache_ttl);

+ }

+

+

+ // Seek by $offset rows

+ if ($offset)

+ {

+ $limit_sql = 'SELECT a2.*

+ FROM (

+ SELECT ROW_NUMBER() OVER() AS rownum, a1.*

+ FROM (

+ ' . $query . '

+ ) a1

+ ) a2

+ WHERE a2.rownum BETWEEN ' . ($offset + 1) . ' AND ' . ($offset + $total);

+ return $this->sql_query($limit_sql, $cache_ttl);

+ }

+ }

+ else

+ {

+ return false;

+ }

+ }

+

+ /**

+ * Return number of affected rows

+ */

+ function sql_affectedrows()

+ {

+ return ($this->db_connect_id) ? @db2_num_rows($this->db_connect_id) : 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)

+ {

+ return false;

+ }

+

+ $row = @db2_fetch_assoc($query_id);

+

+ return $row;

+ }

+

+ /**

+ * Seek to given row number

+ * rownum is zero-based

+ */

+ function sql_rowseek($rownum, $query_id = false)

+ {

+ 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;

+ }

+

+ $this->sql_freeresult($query_id);

+ $query_id = $this->sql_query($this->last_query_text);

+

+ if ($query_id === false)

+ {

+ return false;

+ }

+

+ // 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()

+ {

+ $result_id = @db2_exec($this->db_connect_id, 'VALUES IDENTITY_VAL_LOCAL()');

+ if ($result_id)

+ {

+ if ($row = @db2_fetch_assoc($result_id))

+ {

+ @db2_free_result($result_id);

+ return (int) $row[1];

+ }

+ @db2_free_result($result_id);

+ }

+

+ 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($this->open_queries[$query_id]))

+ {

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

+ return @db2_free_result($query_id);

+ }

+

+ return false;

+ }

+

+ /**

+ * Escape string used in sql query

+ */

+ function sql_escape($msg)

+ {

+ return str_replace("'", "''", $msg);

+ }

+

+ /**

+ * Expose a DBMS specific function

+ */

+ function sql_function($type, $col)

+ {

+ switch ($type)

+ {

+ case 'length_varchar':

+ return 'LENGTH(' . $col . ')';

+ break;

+

+ case 'length_text':

+ return 'LENGTH(' . $col . ')';

+ break;

+ }

+ }

+

+ /**

+ * Build LIKE expression

+ * @access private

+ */

+ function _sql_like_expression($expression)

+ {

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

+ }

+

+ /**

+ * return sql error array

+ * @access private

+ */

+ function _sql_error()

+ {

+ $error = array(

+ 'message' => @db2_stmt_errormsg(),

+ 'code' => @db2_stmt_error()

+ );

+ return $error;

+ }

+

+ /**

+ * Build db-specific query data

+ * @access private

+ */

+ function _sql_custom_build($stage, $data)

+ {

+ return $data;

+ }

+

+ /**

+ * Close sql connection

+ * @access private

+ */

+ function _sql_close()

+ {

+ return @db2_close($this->db_connect_id);

+ }

+

+ /**

+ * Build db-specific report

+ * @access private

+ */

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

+ {

+ switch ($mode)

+ {

+ case 'start':

+

+ $html_table = false;

+ @db2_exec($this->db_connect_id, 'DELETE FROM EXPLAIN_INSTANCE');

+ @db2_exec($this->db_connect_id, 'EXPLAIN PLAN FOR ' . $query);

+

+ // Get the data from the plan

+ $sql = "SELECT O.Operator_ID, S2.Target_ID, O.Operator_Type, S.Object_Name, CAST(O.Total_Cost AS INTEGER) Cost

+ FROM EXPLAIN_OPERATOR O

+ LEFT OUTER JOIN EXPLAIN_STREAM S2 ON O.Operator_ID = S2.Source_ID

+ LEFT OUTER JOIN EXPLAIN_STREAM S ON O.Operator_ID = S.Target_ID AND O.Explain_Time = S.Explain_Time AND S.Object_Name IS NOT NULL

+ ORDER BY O.Explain_Time ASC, Operator_ID ASC";

+ $query_id = @db2_exec($this->db_connect_id, $sql);

+

+ if ($query_id)

+ {

+ while ($row = @db2_fetch_assoc($query_id))

+ {

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

+ }

+

+ @db2_free_result($query_id);

+ }

+

+ if ($html_table)

+ {

+ $this->html_hold .= '</table>';

+ }

+ break;

+

+ case 'fromcache':

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

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

+

+ $result = @db2_exec($this->db_connect_id, $query);

+ while ($void = @db2_fetch_assoc($result, IBASE_TEXT))

+ {

+ // Take the time spent on parsing rows into account

+ }

+ @db2_free_result($result);

+

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

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

+

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

+

+ break;

+ }

+ }

+}

+

+?> \ No newline at end of file