/
pgsql.php
1584 lines (1470 loc) · 57 KB
/
pgsql.php
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<?php
// vim: set et ts=4 sw=4 fdm=marker:
// +----------------------------------------------------------------------+
// | PHP versions 4 and 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2008 Manuel Lemos, Tomas V.V.Cox, |
// | Stig. S. Bakken, Lukas Smith |
// | All rights reserved. |
// +----------------------------------------------------------------------+
// | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB |
// | API as well as database abstraction for PHP applications. |
// | This LICENSE is in the BSD license style. |
// | |
// | Redistribution and use in source and binary forms, with or without |
// | modification, are permitted provided that the following conditions |
// | are met: |
// | |
// | Redistributions of source code must retain the above copyright |
// | notice, this list of conditions and the following disclaimer. |
// | |
// | Redistributions in binary form must reproduce the above copyright |
// | notice, this list of conditions and the following disclaimer in the |
// | documentation and/or other materials provided with the distribution. |
// | |
// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, |
// | Lukas Smith nor the names of his contributors may be used to endorse |
// | or promote products derived from this software without specific prior|
// | written permission. |
// | |
// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
// | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
// | OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
// | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
// | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
// | POSSIBILITY OF SUCH DAMAGE. |
// +----------------------------------------------------------------------+
// | Author: Paul Cooper <pgc@ucecom.com> |
// +----------------------------------------------------------------------+
//
// $Id$
/**
* MDB2 PostGreSQL driver
*
* @package MDB2
* @category Database
* @author Paul Cooper <pgc@ucecom.com>
*/
class MDB2_Driver_pgsql extends MDB2_Driver_Common
{
// {{{ properties
var $string_quoting = array('start' => "'", 'end' => "'", 'escape' => "'", 'escape_pattern' => '\\');
var $identifier_quoting = array('start' => '"', 'end' => '"', 'escape' => '"');
// }}}
// {{{ constructor
/**
* Constructor
*/
function __construct()
{
parent::__construct();
$this->phptype = 'pgsql';
$this->dbsyntax = 'pgsql';
$this->supported['sequences'] = true;
$this->supported['indexes'] = true;
$this->supported['affected_rows'] = true;
$this->supported['summary_functions'] = true;
$this->supported['order_by_text'] = true;
$this->supported['transactions'] = true;
$this->supported['savepoints'] = true;
$this->supported['current_id'] = true;
$this->supported['limit_queries'] = true;
$this->supported['LOBs'] = true;
$this->supported['replace'] = 'emulated';
$this->supported['sub_selects'] = true;
$this->supported['triggers'] = true;
$this->supported['auto_increment'] = 'emulated';
$this->supported['primary_key'] = true;
$this->supported['result_introspection'] = true;
$this->supported['prepared_statements'] = true;
$this->supported['identifier_quoting'] = true;
$this->supported['pattern_escaping'] = true;
$this->supported['new_link'] = true;
$this->options['DBA_username'] = false;
$this->options['DBA_password'] = false;
$this->options['multi_query'] = false;
$this->options['disable_smart_seqname'] = true;
$this->options['max_identifiers_length'] = 63;
}
// }}}
// {{{ errorInfo()
/**
* This method is used to collect information about an error
*
* @param integer $error
* @return array
* @access public
*/
function errorInfo($error = null)
{
// Fall back to MDB2_ERROR if there was no mapping.
$error_code = MDB2_ERROR;
$native_msg = '';
if (is_resource($error)) {
$native_msg = @pg_result_error($error);
} elseif ($this->connection) {
$native_msg = @pg_last_error($this->connection);
if (!$native_msg && @pg_connection_status($this->connection) === PGSQL_CONNECTION_BAD) {
$native_msg = 'Database connection has been lost.';
$error_code = MDB2_ERROR_CONNECT_FAILED;
}
} else {
$native_msg = @pg_last_error();
}
static $error_regexps;
if (empty($error_regexps)) {
$error_regexps = array(
'/column .* (of relation .*)?does not exist/i'
=> MDB2_ERROR_NOSUCHFIELD,
'/(relation|sequence|table).*does not exist|class .* not found/i'
=> MDB2_ERROR_NOSUCHTABLE,
'/database .* does not exist/'
=> MDB2_ERROR_NOT_FOUND,
'/constraint .* does not exist/'
=> MDB2_ERROR_NOT_FOUND,
'/index .* does not exist/'
=> MDB2_ERROR_NOT_FOUND,
'/database .* already exists/i'
=> MDB2_ERROR_ALREADY_EXISTS,
'/relation .* already exists/i'
=> MDB2_ERROR_ALREADY_EXISTS,
'/(divide|division) by zero$/i'
=> MDB2_ERROR_DIVZERO,
'/pg_atoi: error in .*: can\'t parse /i'
=> MDB2_ERROR_INVALID_NUMBER,
'/invalid input syntax for( type)? (integer|numeric)/i'
=> MDB2_ERROR_INVALID_NUMBER,
'/value .* is out of range for type \w*int/i'
=> MDB2_ERROR_INVALID_NUMBER,
'/integer out of range/i'
=> MDB2_ERROR_INVALID_NUMBER,
'/value too long for type character/i'
=> MDB2_ERROR_INVALID,
'/attribute .* not found|relation .* does not have attribute/i'
=> MDB2_ERROR_NOSUCHFIELD,
'/column .* specified in USING clause does not exist in (left|right) table/i'
=> MDB2_ERROR_NOSUCHFIELD,
'/parser: parse error at or near/i'
=> MDB2_ERROR_SYNTAX,
'/syntax error at/'
=> MDB2_ERROR_SYNTAX,
'/column reference .* is ambiguous/i'
=> MDB2_ERROR_SYNTAX,
'/permission denied/'
=> MDB2_ERROR_ACCESS_VIOLATION,
'/violates not-null constraint/'
=> MDB2_ERROR_CONSTRAINT_NOT_NULL,
'/violates [\w ]+ constraint/'
=> MDB2_ERROR_CONSTRAINT,
'/referential integrity violation/'
=> MDB2_ERROR_CONSTRAINT,
'/more expressions than target columns/i'
=> MDB2_ERROR_VALUE_COUNT_ON_ROW,
);
}
if (is_numeric($error) && $error < 0) {
$error_code = $error;
} else {
foreach ($error_regexps as $regexp => $code) {
if (preg_match($regexp, $native_msg)) {
$error_code = $code;
break;
}
}
}
return array($error_code, null, $native_msg);
}
// }}}
// {{{ escape()
/**
* Quotes a string so it can be safely used in a query. It will quote
* the text so it can safely be used within a query.
*
* @param string the input string to quote
* @param bool escape wildcards
*
* @return string quoted string
*
* @access public
*/
function escape($text, $escape_wildcards = false)
{
if ($escape_wildcards) {
$text = $this->escapePattern($text);
}
$connection = $this->getConnection();
if (MDB2::isError($connection)) {
return $connection;
}
if (is_resource($connection) && version_compare(PHP_VERSION, '5.2.0RC5', '>=')) {
$text = @pg_escape_string($connection, $text);
} else {
$text = @pg_escape_string($text);
}
return $text;
}
// }}}
// {{{ beginTransaction()
/**
* Start a transaction or set a savepoint.
*
* @param string name of a savepoint to set
* @return mixed MDB2_OK on success, a MDB2 error on failure
*
* @access public
*/
function beginTransaction($savepoint = null)
{
$this->debug('Starting transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
if (null !== $savepoint) {
if (!$this->in_transaction) {
return $this->raiseError(MDB2_ERROR_INVALID, null, null,
'savepoint cannot be released when changes are auto committed', __FUNCTION__);
}
$query = 'SAVEPOINT '.$savepoint;
return $this->_doQuery($query, true);
}
if ($this->in_transaction) {
return MDB2_OK; //nothing to do
}
if (!$this->destructor_registered && $this->opened_persistent) {
$this->destructor_registered = true;
register_shutdown_function('MDB2_closeOpenTransactions');
}
$result = $this->_doQuery('BEGIN', true);
if (MDB2::isError($result)) {
return $result;
}
$this->in_transaction = true;
return MDB2_OK;
}
// }}}
// {{{ commit()
/**
* Commit the database changes done during a transaction that is in
* progress or release a savepoint. This function may only be called when
* auto-committing is disabled, otherwise it will fail. Therefore, a new
* transaction is implicitly started after committing the pending changes.
*
* @param string name of a savepoint to release
* @return mixed MDB2_OK on success, a MDB2 error on failure
*
* @access public
*/
function commit($savepoint = null)
{
$this->debug('Committing transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
if (!$this->in_transaction) {
return $this->raiseError(MDB2_ERROR_INVALID, null, null,
'commit/release savepoint cannot be done changes are auto committed', __FUNCTION__);
}
if (null !== $savepoint) {
$query = 'RELEASE SAVEPOINT '.$savepoint;
return $this->_doQuery($query, true);
}
$result = $this->_doQuery('COMMIT', true);
if (MDB2::isError($result)) {
return $result;
}
$this->in_transaction = false;
return MDB2_OK;
}
// }}}
// {{{ rollback()
/**
* Cancel any database changes done during a transaction or since a specific
* savepoint that is in progress. This function may only be called when
* auto-committing is disabled, otherwise it will fail. Therefore, a new
* transaction is implicitly started after canceling the pending changes.
*
* @param string name of a savepoint to rollback to
* @return mixed MDB2_OK on success, a MDB2 error on failure
*
* @access public
*/
function rollback($savepoint = null)
{
$this->debug('Rolling back transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
if (!$this->in_transaction) {
return $this->raiseError(MDB2_ERROR_INVALID, null, null,
'rollback cannot be done changes are auto committed', __FUNCTION__);
}
if (null !== $savepoint) {
$query = 'ROLLBACK TO SAVEPOINT '.$savepoint;
return $this->_doQuery($query, true);
}
$query = 'ROLLBACK';
$result = $this->_doQuery($query, true);
if (MDB2::isError($result)) {
return $result;
}
$this->in_transaction = false;
return MDB2_OK;
}
// }}}
// {{{ function setTransactionIsolation()
/**
* Set the transacton isolation level.
*
* @param string standard isolation level
* READ UNCOMMITTED (allows dirty reads)
* READ COMMITTED (prevents dirty reads)
* REPEATABLE READ (prevents nonrepeatable reads)
* SERIALIZABLE (prevents phantom reads)
* @param array some transaction options:
* 'wait' => 'WAIT' | 'NO WAIT'
* 'rw' => 'READ WRITE' | 'READ ONLY'
*
* @return mixed MDB2_OK on success, a MDB2 error on failure
*
* @access public
* @since 2.1.1
*/
function setTransactionIsolation($isolation, $options = array())
{
$this->debug('Setting transaction isolation level', __FUNCTION__, array('is_manip' => true));
switch ($isolation) {
case 'READ UNCOMMITTED':
case 'READ COMMITTED':
case 'REPEATABLE READ':
case 'SERIALIZABLE':
break;
default:
return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
'isolation level is not supported: '.$isolation, __FUNCTION__);
}
$query = "SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL $isolation";
return $this->_doQuery($query, true);
}
// }}}
// {{{ _doConnect()
/**
* Do the grunt work of connecting to the database
*
* @return mixed connection resource on success, MDB2 Error Object on failure
* @access protected
*/
function _doConnect($username, $password, $database_name, $persistent = false)
{
if (!extension_loaded($this->phptype)) {
return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
'extension '.$this->phptype.' is not compiled into PHP', __FUNCTION__);
}
if ($database_name == '') {
$database_name = 'template1';
}
$protocol = $this->dsn['protocol'] ? $this->dsn['protocol'] : 'tcp';
$params = array('');
if ($protocol == 'tcp') {
if ($this->dsn['hostspec']) {
$params[0].= 'host=' . $this->dsn['hostspec'];
}
if ($this->dsn['port']) {
$params[0].= ' port=' . $this->dsn['port'];
}
} elseif ($protocol == 'unix') {
// Allow for pg socket in non-standard locations.
if ($this->dsn['socket']) {
$params[0].= 'host=' . $this->dsn['socket'];
}
if ($this->dsn['port']) {
$params[0].= ' port=' . $this->dsn['port'];
}
}
if ($database_name) {
$params[0].= ' dbname=\'' . addslashes($database_name) . '\'';
}
if ($username) {
$params[0].= ' user=\'' . addslashes($username) . '\'';
}
if ($password) {
$params[0].= ' password=\'' . addslashes($password) . '\'';
}
if (!empty($this->dsn['options'])) {
$params[0].= ' options=' . $this->dsn['options'];
}
if (!empty($this->dsn['tty'])) {
$params[0].= ' tty=' . $this->dsn['tty'];
}
if (!empty($this->dsn['connect_timeout'])) {
$params[0].= ' connect_timeout=' . $this->dsn['connect_timeout'];
}
if (!empty($this->dsn['sslmode'])) {
$params[0].= ' sslmode=' . $this->dsn['sslmode'];
}
if (!empty($this->dsn['service'])) {
$params[0].= ' service=' . $this->dsn['service'];
}
if ($this->_isNewLinkSet()) {
if (version_compare(phpversion(), '4.3.0', '>=')) {
$params[] = PGSQL_CONNECT_FORCE_NEW;
}
}
$connect_function = $persistent ? 'pg_pconnect' : 'pg_connect';
$connection = @call_user_func_array($connect_function, $params);
if (!$connection) {
return $this->raiseError(MDB2_ERROR_CONNECT_FAILED, null, null,
'unable to establish a connection', __FUNCTION__);
}
if (empty($this->dsn['disable_iso_date'])) {
if (!@pg_query($connection, "SET SESSION DATESTYLE = 'ISO'")) {
return $this->raiseError(null, null, null,
'Unable to set date style to iso', __FUNCTION__);
}
}
if (!empty($this->dsn['charset'])) {
$result = $this->setCharset($this->dsn['charset'], $connection);
if (MDB2::isError($result)) {
return $result;
}
}
// Enable extra compatibility settings on 8.2 and later
if (function_exists('pg_parameter_status')) {
$version = pg_parameter_status($connection, 'server_version');
if ($version == false) {
return $this->raiseError(null, null, null,
'Unable to retrieve server version', __FUNCTION__);
}
$version = explode ('.', $version);
if ( $version['0'] > 8
|| ($version['0'] == 8 && $version['1'] >= 2)
) {
if (!@pg_query($connection, "SET SESSION STANDARD_CONFORMING_STRINGS = OFF")) {
return $this->raiseError(null, null, null,
'Unable to set standard_conforming_strings to off', __FUNCTION__);
}
if (!@pg_query($connection, "SET SESSION ESCAPE_STRING_WARNING = OFF")) {
return $this->raiseError(null, null, null,
'Unable to set escape_string_warning to off', __FUNCTION__);
}
}
}
return $connection;
}
// }}}
// {{{ connect()
/**
* Connect to the database
*
* @return true on success, MDB2 Error Object on failure
* @access public
*/
function connect()
{
if (is_resource($this->connection)) {
//if (count(array_diff($this->connected_dsn, $this->dsn)) == 0
if (MDB2::areEquals($this->connected_dsn, $this->dsn)
&& $this->connected_database_name == $this->database_name
&& ($this->opened_persistent == $this->options['persistent'])
) {
return MDB2_OK;
}
$this->disconnect(false);
}
if ($this->database_name) {
$connection = $this->_doConnect($this->dsn['username'],
$this->dsn['password'],
$this->database_name,
$this->options['persistent']);
if (MDB2::isError($connection)) {
return $connection;
}
$this->connection = $connection;
$this->connected_dsn = $this->dsn;
$this->connected_database_name = $this->database_name;
$this->opened_persistent = $this->options['persistent'];
$this->dbsyntax = $this->dsn['dbsyntax'] ? $this->dsn['dbsyntax'] : $this->phptype;
}
return MDB2_OK;
}
// }}}
// {{{ setCharset()
/**
* Set the charset on the current connection
*
* @param string charset
* @param resource connection handle
*
* @return true on success, MDB2 Error Object on failure
*/
function setCharset($charset, $connection = null)
{
if (null === $connection) {
$connection = $this->getConnection();
if (MDB2::isError($connection)) {
return $connection;
}
}
if (is_array($charset)) {
$charset = array_shift($charset);
$this->warnings[] = 'postgresql does not support setting client collation';
}
$result = @pg_set_client_encoding($connection, $charset);
if ($result == -1) {
return $this->raiseError(null, null, null,
'Unable to set client charset: '.$charset, __FUNCTION__);
}
return MDB2_OK;
}
// }}}
// {{{ databaseExists()
/**
* check if given database name is exists?
*
* @param string $name name of the database that should be checked
*
* @return mixed true/false on success, a MDB2 error on failure
* @access public
*/
function databaseExists($name)
{
$res = $this->_doConnect($this->dsn['username'],
$this->dsn['password'],
$this->escape($name),
$this->options['persistent']);
if (!MDB2::isError($res)) {
return true;
}
return false;
}
// }}}
// {{{ disconnect()
/**
* Log out and disconnect from the database.
*
* @param boolean $force if the disconnect should be forced even if the
* connection is opened persistently
* @return mixed true on success, false if not connected and error
* object on error
* @access public
*/
function disconnect($force = true)
{
if (is_resource($this->connection)) {
if ($this->in_transaction) {
$dsn = $this->dsn;
$database_name = $this->database_name;
$persistent = $this->options['persistent'];
$this->dsn = $this->connected_dsn;
$this->database_name = $this->connected_database_name;
$this->options['persistent'] = $this->opened_persistent;
$this->rollback();
$this->dsn = $dsn;
$this->database_name = $database_name;
$this->options['persistent'] = $persistent;
}
if (!$this->opened_persistent || $force) {
$ok = @pg_close($this->connection);
if (!$ok) {
return $this->raiseError(MDB2_ERROR_DISCONNECT_FAILED,
null, null, null, __FUNCTION__);
}
}
} else {
return false;
}
return parent::disconnect($force);
}
// }}}
// {{{ standaloneQuery()
/**
* execute a query as DBA
*
* @param string $query the SQL query
* @param mixed $types array that contains the types of the columns in
* the result set
* @param boolean $is_manip if the query is a manipulation query
* @return mixed MDB2_OK on success, a MDB2 error on failure
* @access public
*/
function standaloneQuery($query, $types = null, $is_manip = false)
{
$user = $this->options['DBA_username']? $this->options['DBA_username'] : $this->dsn['username'];
$pass = $this->options['DBA_password']? $this->options['DBA_password'] : $this->dsn['password'];
$connection = $this->_doConnect($user, $pass, $this->database_name, $this->options['persistent']);
if (MDB2::isError($connection)) {
return $connection;
}
$offset = $this->offset;
$limit = $this->limit;
$this->offset = $this->limit = 0;
$query = $this->_modifyQuery($query, $is_manip, $limit, $offset);
$result = $this->_doQuery($query, $is_manip, $connection, $this->database_name);
if (!MDB2::isError($result)) {
if ($is_manip) {
$result = $this->_affectedRows($connection, $result);
} else {
$result = $this->_wrapResult($result, $types, true, true, $limit, $offset);
}
}
@pg_close($connection);
return $result;
}
// }}}
// {{{ _doQuery()
/**
* Execute a query
* @param string $query query
* @param boolean $is_manip if the query is a manipulation query
* @param resource $connection
* @param string $database_name
* @return result or error object
* @access protected
*/
function _doQuery($query, $is_manip = false, $connection = null, $database_name = null)
{
$this->last_query = $query;
$result = $this->debug($query, 'query', array('is_manip' => $is_manip, 'when' => 'pre'));
if ($result) {
if (MDB2::isError($result)) {
return $result;
}
$query = $result;
}
if ($this->options['disable_query']) {
$result = $is_manip ? 0 : null;
return $result;
}
if (null === $connection) {
$connection = $this->getConnection();
if (MDB2::isError($connection)) {
return $connection;
}
}
$function = $this->options['multi_query'] ? 'pg_send_query' : 'pg_query';
$result = @$function($connection, $query);
if (!$result) {
$err = $this->raiseError(null, null, null,
'Could not execute statement', __FUNCTION__);
return $err;
} elseif ($this->options['multi_query']) {
if (!($result = @pg_get_result($connection))) {
$err = $this->raiseError(null, null, null,
'Could not get the first result from a multi query', __FUNCTION__);
return $err;
}
}
$this->debug($query, 'query', array('is_manip' => $is_manip, 'when' => 'post', 'result' => $result));
return $result;
}
// }}}
// {{{ _affectedRows()
/**
* Returns the number of rows affected
*
* @param resource $result
* @param resource $connection
* @return mixed MDB2 Error Object or the number of rows affected
* @access private
*/
function _affectedRows($connection, $result = null)
{
if (null === $connection) {
$connection = $this->getConnection();
if (MDB2::isError($connection)) {
return $connection;
}
}
return @pg_affected_rows($result);
}
// }}}
// {{{ _modifyQuery()
/**
* Changes a query string for various DBMS specific reasons
*
* @param string $query query to modify
* @param boolean $is_manip if it is a DML query
* @param integer $limit limit the number of rows
* @param integer $offset start reading from given offset
* @return string modified query
* @access protected
*/
function _modifyQuery($query, $is_manip, $limit, $offset)
{
if ($limit > 0
&& !preg_match('/LIMIT\s*\d(?:\s*(?:,|OFFSET)\s*\d+)?(?:[^\)]*)?$/i', $query)
) {
$query = rtrim($query);
if (substr($query, -1) == ';') {
$query = substr($query, 0, -1);
}
if ($is_manip) {
$query = $this->_modifyManipQuery($query, $limit);
} else {
$query.= " LIMIT $limit OFFSET $offset";
}
}
return $query;
}
// }}}
// {{{ _modifyManipQuery()
/**
* Changes a manip query string for various DBMS specific reasons
*
* @param string $query query to modify
* @param integer $limit limit the number of rows
* @return string modified query
* @access protected
*/
function _modifyManipQuery($query, $limit)
{
$pos = strpos(strtolower($query), 'where');
$where = $pos ? substr($query, $pos) : '';
$manip_clause = '(\bDELETE\b\s+(?:\*\s+)?\bFROM\b|\bUPDATE\b)';
$from_clause = '([\w\.]+)';
$where_clause = '(?:(.*)\bWHERE\b\s+(.*))|(.*)';
$pattern = '/^'. $manip_clause . '\s+' . $from_clause .'(?:\s)*(?:'. $where_clause .')?$/i';
$matches = preg_match($pattern, $query, $match);
if ($matches) {
$manip = $match[1];
$from = $match[2];
$what = (count($matches) == 6) ? $match[5] : $match[3];
return $manip.' '.$from.' '.$what.' WHERE ctid=(SELECT ctid FROM '.$from.' '.$where.' LIMIT '.$limit.')';
}
//return error?
return $query;
}
// }}}
// {{{ getServerVersion()
/**
* return version information about the server
*
* @param bool $native determines if the raw version string should be returned
* @return mixed array/string with version information or MDB2 error object
* @access public
*/
function getServerVersion($native = false)
{
$query = 'SHOW SERVER_VERSION';
if ($this->connected_server_info) {
$server_info = $this->connected_server_info;
} else {
$server_info = $this->queryOne($query, 'text');
if (MDB2::isError($server_info)) {
return $server_info;
}
}
// cache server_info
$this->connected_server_info = $server_info;
if (!$native && !MDB2::isError($server_info)) {
$tmp = explode('.', $server_info, 3);
if (empty($tmp[2])
&& isset($tmp[1])
&& preg_match('/(\d+)(.*)/', $tmp[1], $tmp2)
) {
$server_info = array(
'major' => $tmp[0],
'minor' => $tmp2[1],
'patch' => null,
'extra' => $tmp2[2],
'native' => $server_info,
);
} else {
$server_info = array(
'major' => isset($tmp[0]) ? $tmp[0] : null,
'minor' => isset($tmp[1]) ? $tmp[1] : null,
'patch' => isset($tmp[2]) ? $tmp[2] : null,
'extra' => null,
'native' => $server_info,
);
}
}
return $server_info;
}
// }}}
// {{{ prepare()
/**
* Prepares a query for multiple execution with execute().
* With some database backends, this is emulated.
* prepare() requires a generic query as string like
* 'INSERT INTO numbers VALUES(?,?)' or
* 'INSERT INTO numbers VALUES(:foo,:bar)'.
* The ? and :name and are placeholders which can be set using
* bindParam() and the query can be sent off using the execute() method.
* The allowed format for :name can be set with the 'bindname_format' option.
*
* @param string $query the query to prepare
* @param mixed $types array that contains the types of the placeholders
* @param mixed $result_types array that contains the types of the columns in
* the result set or MDB2_PREPARE_RESULT, if set to
* MDB2_PREPARE_MANIP the query is handled as a manipulation query
* @param mixed $lobs key (field) value (parameter) pair for all lob placeholders
* @return mixed resource handle for the prepared query on success, a MDB2
* error on failure
* @access public
* @see bindParam, execute
*/
function prepare($query, $types = null, $result_types = null, $lobs = array())
{
if ($this->options['emulate_prepared']) {
return parent::prepare($query, $types, $result_types, $lobs);
}
$is_manip = ($result_types === MDB2_PREPARE_MANIP);
$offset = $this->offset;
$limit = $this->limit;
$this->offset = $this->limit = 0;
$result = $this->debug($query, __FUNCTION__, array('is_manip' => $is_manip, 'when' => 'pre'));
if ($result) {
if (MDB2::isError($result)) {
return $result;
}
$query = $result;
}
$pgtypes = function_exists('pg_prepare') ? false : array();
if ($pgtypes !== false && !empty($types)) {
$this->loadModule('Datatype', null, true);
}
$query = $this->_modifyQuery($query, $is_manip, $limit, $offset);
$placeholder_type_guess = $placeholder_type = null;
$question = '?';
$colon = ':';
$positions = array();
$position = $parameter = 0;
while ($position < strlen($query)) {
$q_position = strpos($query, $question, $position);
$c_position = strpos($query, $colon, $position);
//skip "::type" cast ("select id::varchar(20) from sometable where name=?")
$doublecolon_position = strpos($query, '::', $position);
if ($doublecolon_position !== false && $doublecolon_position == $c_position) {
$c_position = strpos($query, $colon, $position+2);
}
if ($q_position && $c_position) {
$p_position = min($q_position, $c_position);
} elseif ($q_position) {
$p_position = $q_position;
} elseif ($c_position) {
$p_position = $c_position;
} else {
break;
}
if (null === $placeholder_type) {
$placeholder_type_guess = $query[$p_position];
}
$new_pos = $this->_skipDelimitedStrings($query, $position, $p_position);
if (MDB2::isError($new_pos)) {
return $new_pos;
}
if ($new_pos != $position) {
$position = $new_pos;
continue; //evaluate again starting from the new position
}
if ($query[$position] == $placeholder_type_guess) {
if (null === $placeholder_type) {
$placeholder_type = $query[$p_position];
$question = $colon = $placeholder_type;
if (!empty($types) && is_array($types)) {
if ($placeholder_type == ':') {
} else {
$types = array_values($types);
}
}
}
if ($placeholder_type_guess == '?') {
$length = 1;
$name = $parameter;
} else {
$regexp = '/^.{'.($position+1).'}('.$this->options['bindname_format'].').*$/s';
$param = preg_replace($regexp, '\\1', $query);
if ($param === '') {
$err = $this->raiseError(MDB2_ERROR_SYNTAX, null, null,
'named parameter name must match "bindname_format" option', __FUNCTION__);
return $err;
}
$length = strlen($param) + 1;
$name = $param;
}
if ($pgtypes !== false) {
if (is_array($types) && array_key_exists($name, $types)) {
$pgtypes[] = $this->datatype->mapPrepareDatatype($types[$name]);
} elseif (is_array($types) && array_key_exists($parameter, $types)) {
$pgtypes[] = $this->datatype->mapPrepareDatatype($types[$parameter]);
} else {
$pgtypes[] = 'text';
}
}
if (($key_parameter = array_search($name, $positions)) !== false) {
//$next_parameter = 1;
$parameter = $key_parameter + 1;
//foreach ($positions as $key => $value) {
// if ($key_parameter == $key) {
// break;
// }
// ++$next_parameter;
//}
} else {
++$parameter;
//$next_parameter = $parameter;
$positions[] = $name;
}
$query = substr_replace($query, '$'.$parameter, $position, $length);
$position = $p_position + strlen($parameter);
} else {
$position = $p_position;
}
}
$connection = $this->getConnection();
if (MDB2::isError($connection)) {
return $connection;
}
static $prep_statement_counter = 1;
$randomStr = sprintf('%d', $prep_statement_counter++) . sha1(microtime() . sprintf('%d', mt_rand()));
$statement_name = sprintf($this->options['statement_format'], $this->phptype, $randomStr);
$statement_name = substr(strtolower($statement_name), 0, $this->options['max_identifiers_length']);
if (false === $pgtypes) {
$result = @pg_prepare($connection, $statement_name, $query);
if (!$result) {
$err = $this->raiseError(null, null, null,
'Unable to create prepared statement handle', __FUNCTION__);
return $err;
}
} else {
$types_string = '';
if ($pgtypes) {
$types_string = ' ('.implode(', ', $pgtypes).') ';