Oracle support

git-svn-id: file:///svn/phpbb/trunk@9288 89ea8834-ac86-4346-8a33-228a782c2dd0
This commit is contained in:
Meik Sievertsen 2009-01-21 17:06:38 +00:00
parent 10e5d8b3ed
commit 270fd1f5f8

View file

@ -16,232 +16,119 @@ if (!defined('IN_PHPBB'))
exit; exit;
} }
include_once(PHPBB_ROOT_PATH . 'includes/db/dbal.' . PHP_EXT);
/** /**
* Oracle Database Abstraction Layer * Oracle Database Abstraction Layer
* Minimum Requirement: 9.2+
* @package dbal * @package dbal
*/ */
class dbal_oracle extends dbal class phpbb_dbal_oracle extends phpbb_dbal
{ {
var $last_query_text = ''; /**
* @var string Database type. No distinction between versions or used extensions.
var $dbms_type = 'oracle'; */
public $dbms_type = 'oracle';
/** /**
* Connect to server * @var array Database type map, column layout information
*/ */
function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false) public $dbms_type_map = array(
'INT:' => 'number(%d)',
'BINT' => 'number(20)',
'UINT' => 'number(8)',
'UINT:' => 'number(%d)',
'TINT:' => 'number(%d)',
'USINT' => 'number(4)',
'BOOL' => 'number(1)',
'VCHAR' => 'varchar2(255)',
'VCHAR:' => 'varchar2(%d)',
'CHAR:' => 'char(%d)',
'XSTEXT' => 'varchar2(1000)',
'STEXT' => 'varchar2(3000)',
'TEXT' => 'clob',
'MTEXT' => 'clob',
'XSTEXT_UNI'=> 'varchar2(300)',
'STEXT_UNI' => 'varchar2(765)',
'TEXT_UNI' => 'clob',
'MTEXT_UNI' => 'clob',
'TIMESTAMP' => 'number(11)',
'DECIMAL' => 'number(5, 2)',
'DECIMAL:' => 'number(%d, 2)',
'PDECIMAL' => 'number(6, 3)',
'PDECIMAL:' => 'number(%d, 3)',
'VCHAR_UNI' => 'varchar2(255)',
'VCHAR_UNI:'=> array('varchar2(%d)', 'limit' => array('mult', 3, 765, 'clob')),
'VARBINARY' => 'raw(255)',
);
/**
* @var string Last query executed. We need this for sql_nextid()
*/
var $last_query_text = '';
/**
* Connect to server. See {@link phpbb_dbal::sql_connect() sql_connect()} for details.
*/
public function sql_connect($server, $user, $password, $database, $port = false, $persistency = false , $new_link = false)
{ {
$this->persistency = $persistency; $this->persistency = $persistency;
$this->user = $sqluser; $this->user = $user;
$this->server = $sqlserver . (($port) ? ':' . $port : ''); $this->server = $server . (($port) ? ':' . $port : '');
$this->dbname = $database; $this->dbname = $database;
$this->port = $port;
$connect = $database; $connect = $database;
// support for "easy connect naming" // support for "easy connect naming"
if ($sqlserver !== '' && $sqlserver !== '/') if ($server !== '' && $server !== '/')
{ {
if (substr($sqlserver, -1, 1) == '/') if (substr($server, -1, 1) == '/')
{ {
$sqlserver == substr($sqlserver, 0, -1); $server == substr($sqlserver, 0, -1);
} }
$connect = $sqlserver . (($port) ? ':' . $port : '') . '/' . $database; $connect = $server . (($port) ? ':' . $port : '') . '/' . $database;
} }
$this->db_connect_id = ($new_link) ? @oci_new_connect($this->user, $sqlpassword, $connect, 'AL32UTF8') : (($this->persistency) ? @oci_pconnect($this->user, $sqlpassword, $connect, 'AL32UTF8') : @oci_connect($this->user, $sqlpassword, $connect, 'AL32UTF8')); $this->db_connect_id = ($new_link) ? @oci_new_connect($this->user, $password, $connect, 'AL32UTF8') : (($this->persistency) ? @oci_pconnect($this->user, $password, $connect, 'AL32UTF8') : @oci_connect($this->user, $password, $connect, 'AL32UTF8'));
return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error(''); return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
} }
/** /**
* Version information about used database * Version information about used database. See {@link phpbb_dbal::sql_server_info() sql_server_info()} for details.
* @param bool $raw if true, only return the fetched sql_server_version
* @return string sql server version
*/ */
function sql_server_info($raw = false) public function sql_server_info($raw = false)
{ {
/* if (!phpbb::registered('acm') || ($this->sql_server_version = phpbb::$acm->get('#oracle_version')) === 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%\''); $sql = "SELECT value
FROM NLS_DATABASE_PARAMETERS
WHERE PARAMETER = 'NLS_RDBMS_VERSION'";
$result = @ociparse($this->db_connect_id, $sql);
@ociexecute($result, OCI_DEFAULT); @ociexecute($result, OCI_DEFAULT);
@ocicommit($this->db_connect_id); @ocicommit($this->db_connect_id);
$row = array(); $row = array();
@ocifetchinto($result, $row, OCI_ASSOC + OCI_RETURN_NULLS); @ocifetchinto($result, $row, OCI_ASSOC + OCI_RETURN_NULLS);
@ocifreestatement($result); @ocifreestatement($result);
$this->sql_server_version = trim($row['BANNER']);
$cache->put('oracle_version', $this->sql_server_version); $this->sql_server_version = (isset($row['VALUE'])) ? trim($row['VALUE']) : 0;
if (phpbb::registered('acm'))
{
phpbb::$acm->put('#oracle_version', $this->sql_server_version);
}
} }
*/
$this->sql_server_version = @ociserverversion($this->db_connect_id);
return $this->sql_server_version; return ($raw) ? $this->sql_server_version : @oci_server_version($this->db_connect_id);
} }
/** /**
* SQL Transaction * DB-specific base query method. See {@link phpbb_dbal::_sql_query() _sql_query()} for details.
* @access private
*/ */
function _sql_transaction($status = 'begin') protected function _sql_query($query)
{ {
switch ($status)
{
case 'begin':
return true;
break;
case 'commit':
return @oci_commit($this->db_connect_id);
break;
case 'rollback':
return @oci_rollback($this->db_connect_id);
break;
}
return true;
}
/**
* Oracle specific code to handle the fact that it does not compare columns properly
* @access private
*/
function _rewrite_col_compare($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->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; $in_transaction = false;
if (!$this->transaction) if (!$this->transaction)
{ {
@ -269,7 +156,8 @@ class dbal_oracle extends dbal
foreach ($inserts as $key => $value) foreach ($inserts as $key => $value)
{ {
if (!empty($value) && $value[0] === "'" && strlen($value) > 4002) // check to see if this thing is greater than the max + 'x2 // check to see if this thing is greater than the max + 'x2
if (!empty($value) && $value[0] === "'" && strlen($value) > 4002)
{ {
$inserts[$key] = ':' . strtoupper($cols[$key]); $inserts[$key] = ':' . strtoupper($cols[$key]);
$array[$inserts[$key]] = str_replace("''", "'", substr($value, 1, -1)); $array[$inserts[$key]] = str_replace("''", "'", substr($value, 1, -1));
@ -291,7 +179,8 @@ class dbal_oracle extends dbal
$cols = array(); $cols = array();
foreach ($temp as $value) foreach ($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 // check to see if this thing is greater than the max + 'x2
if (!empty($value[2]) && $value[2][0] === "'" && strlen($value[2]) > 4002)
{ {
$cols[] = $value[1] . '=:' . strtoupper($value[1]); $cols[] = $value[1] . '=:' . strtoupper($value[1]);
$array[$value[1]] = str_replace("''", "'", substr($value[2], 1, -1)); $array[$value[1]] = str_replace("''", "'", substr($value[2], 1, -1));
@ -331,96 +220,111 @@ class dbal_oracle extends dbal
break; break;
} }
$this->query_result = @oci_parse($this->db_connect_id, $query); $result = @oci_parse($this->db_connect_id, $query);
foreach ($array as $key => $value) if (!$result)
{
@oci_bind_by_name($this->query_result, $key, $array[$key], -1);
}
$success = @oci_execute($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 false;
} }
return $this->query_result; foreach ($array as $key => $value)
{
@oci_bind_by_name($result, $key, $array[$key], -1);
}
$success = @oci_execute($result, OCI_DEFAULT);
if (!$success)
{
return false;
}
if (!$in_transaction)
{
$this->sql_transaction('commit');
}
return $result;
} }
/** /**
* Build LIMIT query * Build LIMIT query and run it. See {@link phpbb_dbal::_sql_query_limit() _sql_query_limit()} for details.
*/ */
function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0) protected function _sql_query_limit($query, $total, $offset, $cache_ttl)
{ {
$this->query_result = false;
$query = 'SELECT * FROM (SELECT /*+ FIRST_ROWS */ rownum AS xrownum, a.* FROM (' . $query . ') a WHERE rownum <= ' . ($offset + $total) . ') WHERE xrownum >= ' . $offset; $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 $this->sql_query($query, $cache_ttl);
} }
/** /**
* Return number of affected rows * Close sql connection. See {@link phpbb_dbal::_sql_close() _sql_close()} for details.
*/ */
function sql_affectedrows() protected function _sql_close()
{
return @oci_close($this->db_connect_id);
}
/**
* SQL Transaction. See {@link phpbb_dbal::_sql_transaction() _sql_transaction()} for details.
*/
protected function _sql_transaction($status)
{
switch ($status)
{
case 'begin':
return true;
break;
case 'commit':
return @oci_commit($this->db_connect_id);
break;
case 'rollback':
return @oci_rollback($this->db_connect_id);
break;
}
return true;
}
/**
* Return number of affected rows. See {@link phpbb_dbal::sql_affectedrows() sql_affectedrows()} for details.
*/
public function sql_affectedrows()
{ {
return ($this->query_result) ? @oci_num_rows($this->query_result) : false; return ($this->query_result) ? @oci_num_rows($this->query_result) : false;
} }
/** /**
* Fetch current row * Get last inserted id after insert statement. See {@link phpbb_dbal::sql_nextid() sql_nextid()} for details.
*/ */
function sql_fetchrow($query_id = false) public function sql_nextid()
{ {
global $cache; if (!$this->query_result || !$this->last_query_text)
if ($query_id === false)
{ {
$query_id = $this->query_result; return false;
} }
if (isset($cache->sql_rowset[$query_id])) if (preg_match('#^INSERT[\t\n ]+INTO[\t\n ]+([a-z0-9\_\-]+)#is', $this->last_query_text, $tablename))
{ {
return $cache->sql_fetchrow($query_id); $query = 'SELECT ' . $tablename[1] . '_seq.currval FROM DUAL';
$stmt = @oci_parse($this->db_connect_id, $query);
@oci_execute($stmt, OCI_DEFAULT);
$temp_array = @oci_fetch_array($stmt, OCI_ASSOC + OCI_RETURN_NULLS);
@oci_free_statement($stmt);
return (isset($temp_array['CURRVAL'])) ? $temp_array['CURRVAL'] : false;
} }
if ($query_id !== false) return false;
}
/**
* Fetch current row. See {@link phpbb_dbal::_sql_fetchrow() _sql_fetchrow()} for details.
*/
protected function _sql_fetchrow($query_id)
{ {
$row = array();
$row = @oci_fetch_array($query_id, OCI_ASSOC + OCI_RETURN_NULLS); $row = @oci_fetch_array($query_id, OCI_ASSOC + OCI_RETURN_NULLS);
if (!$row) if (!$row)
@ -449,79 +353,34 @@ class dbal_oracle extends dbal
return $result_row; return $result_row;
} }
return false;
}
/** /**
* Get last inserted id after insert statement * Free query result. See {@link phpbb_dbal::_sql_freeresult() _sql_freeresult()} for details.
*/ */
function sql_nextid() protected function _sql_freeresult($query_id)
{ {
$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';
$stmt = @oci_parse($this->db_connect_id, $query);
@oci_execute($stmt, OCI_DEFAULT);
$temp_array = @oci_fetch_array($stmt, OCI_ASSOC + OCI_RETURN_NULLS);
@oci_free_statement($stmt);
if ($temp_array)
{
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) $query_id]);
return @oci_free_statement($query_id); return @oci_free_statement($query_id);
} }
return false; /**
* Correctly adjust LIKE expression for special characters. See {@link phpbb_dbal::_sql_like_expression() _sql_like_expression()} for details.
*/
protected function _sql_like_expression($expression)
{
return $expression . " ESCAPE '\\'";
} }
/** /**
* Escape string used in sql query * Escape string used in sql query. See {@link phpbb_dbal::sql_escape() sql_escape()} for details.
*/ */
function sql_escape($msg) public function sql_escape($msg)
{ {
return str_replace(array("'", "\0"), array("''", ''), $msg); return str_replace(array("'", "\0"), array("''", ''), $msg);
} }
/** /**
* Expose a DBMS specific function * Expose a DBMS specific function. See {@link phpbb_dbal::sql_function() sql_function()} for details.
*/ */
function sql_function($type, $col) public function sql_function($type, $col)
{ {
switch ($type) switch ($type)
{ {
@ -535,7 +394,9 @@ class dbal_oracle extends dbal
} }
} }
function sql_handle_data($type, $table, $data, $where = '') /**
* Handle data by using prepared statements. See {@link phpbb_dbal::sql_handle_data() sql_handle_data()} for details.
public function sql_handle_data($type, $table, $data, $where = '')
{ {
if ($type === 'INSERT') if ($type === 'INSERT')
{ {
@ -567,73 +428,55 @@ class dbal_oracle extends dbal
oci_execute($stmt); oci_execute($stmt);
} }
*/
/** /**
* Build LIKE expression * Build DB-specific query bits. See {@link phpbb_dbal::_sql_custom_build() _sql_custom_build()} for details.
* @access private
*/ */
function _sql_like_expression($expression) protected function _sql_custom_build($stage, $data)
{
return $expression . " ESCAPE '\\'";
}
function _sql_custom_build($stage, $data)
{ {
return $data; return $data;
} }
/** /**
* return sql error array * return sql error array. See {@link phpbb_dbal::_sql_error() _sql_error()} for details.
* @access private
*/ */
function _sql_error() protected function _sql_error()
{ {
$error = @oci_error(); $error = @oci_error();
$error = (!$error) ? @oci_error($this->query_result) : $error; $error = (empty($error)) ? @oci_error($this->query_result) : $error;
$error = (!$error) ? @oci_error($this->db_connect_id) : $error; $error = (empty($error)) ? @oci_error($this->db_connect_id) : $error;
if ($error) if (empty($error))
{ {
$this->last_error_result = $error; $error = array(
} 'message' => '',
else 'code' => '',
{ );
$error = (isset($this->last_error_result) && $this->last_error_result) ? $this->last_error_result : array();
} }
return $error; return $error;
} }
/** /**
* Close sql connection * Run DB-specific code to build SQL Report to explain queries, show statistics and runtime information. See {@link phpbb_dbal::_sql_report() _sql_report()} for details.
* @access private
*/ */
function _sql_close() protected function _sql_report($mode, $query = '')
{
return @oci_close($this->db_connect_id);
}
/**
* Build db-specific report
* @access private
*/
function _sql_report($mode, $query = '')
{ {
switch ($mode) switch ($mode)
{ {
case 'start': case 'start':
$html_table = false; $html_table = false;
// Grab a plan table, any will do // Grab a plan table, any will do
$sql = "SELECT table_name $sql = "SELECT table_name
FROM USER_TABLES FROM USER_TABLES
WHERE table_name LIKE '%PLAN_TABLE%'"; WHERE table_name LIKE '%PLAN_TABLE%'";
$stmt = oci_parse($this->db_connect_id, $sql); $stmt = @oci_parse($this->db_connect_id, $sql);
oci_execute($stmt); @oci_execute($stmt);
$result = array(); $result = array();
if ($result = oci_fetch_array($stmt, OCI_ASSOC + OCI_RETURN_NULLS)) if ($result = @oci_fetch_array($stmt, OCI_ASSOC + OCI_RETURN_NULLS))
{ {
$table = $result['TABLE_NAME']; $table = $result['TABLE_NAME'];
@ -641,17 +484,17 @@ class dbal_oracle extends dbal
$statement_id = substr(md5($query), 0, 30); $statement_id = substr(md5($query), 0, 30);
// Remove any stale plans // Remove any stale plans
$stmt2 = oci_parse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'"); $stmt2 = @oci_parse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'");
oci_execute($stmt2); @oci_execute($stmt2);
oci_free_statement($stmt2); @oci_free_statement($stmt2);
// Explain the plan // Explain the plan
$sql = "EXPLAIN PLAN $sql = "EXPLAIN PLAN
SET STATEMENT_ID = '$statement_id' SET STATEMENT_ID = '$statement_id'
FOR $query"; FOR $query";
$stmt2 = ociparse($this->db_connect_id, $sql); $stmt2 = @ociparse($this->db_connect_id, $sql);
oci_execute($stmt2); @oci_execute($stmt2);
oci_free_statement($stmt2); @oci_free_statement($stmt2);
// Get the data from the plan // Get the data from the plan
$sql = "SELECT operation, options, object_name, object_type, cardinality, cost $sql = "SELECT operation, options, object_name, object_type, cardinality, cost
@ -659,24 +502,23 @@ class dbal_oracle extends dbal
START WITH id = 0 AND statement_id = '$statement_id' START WITH id = 0 AND statement_id = '$statement_id'
CONNECT BY PRIOR id = parent_id CONNECT BY PRIOR id = parent_id
AND statement_id = '$statement_id'"; AND statement_id = '$statement_id'";
$stmt2 = oci_parse($this->db_connect_id, $sql); $stmt2 = @oci_parse($this->db_connect_id, $sql);
oci_execute($stmt2); @oci_execute($stmt2);
$row = array(); $row = array();
while ($row = oci_fetch_array($stmt2, OCI_ASSOC + OCI_RETURN_NULLS)) while ($row = @oci_fetch_array($stmt2, OCI_ASSOC + OCI_RETURN_NULLS))
{ {
$html_table = $this->sql_report('add_select_row', $query, $html_table, $row); $html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
} }
@oci_free_statement($stmt2);
oci_free_statement($stmt2);
// Remove the plan we just made, we delete them on request anyway // Remove the plan we just made, we delete them on request anyway
$stmt2 = oci_parse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'"); $stmt2 = @oci_parse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'");
oci_execute($stmt2); @oci_execute($stmt2);
oci_free_statement($stmt2); @oci_free_statement($stmt2);
} }
oci_free_statement($stmt); @oci_free_statement($stmt);
if ($html_table) if ($html_table)
{ {
@ -707,6 +549,116 @@ class dbal_oracle extends dbal
break; break;
} }
} }
/**
* Oracle specific code to handle the fact that it does not compare columns properly
* @access private
*/
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
*/
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;
}
} }
?> ?>