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<?php
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2004 Manuel Lemos, Tomas V.V.Cox, |
// | Stig. S. Bakken, Lukas Smith |
// | All rights reserved. |
// +----------------------------------------------------------------------+
// | MDB 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: pgsql.php,v 1.62.4.20 2004/03/12 16:19:30 lsmith Exp $
require_once('MDB/Common.php');
/**
* MDB PostGreSQL driver
*
* Notes:
* - Creation of new databases is based on database template1.
*
* - The decimal type fields are emulated with integer fields.
*
* - PostgreSQL stores large objects in files managed by the server.
* Tables with large object fields only store identifiers pointing to those
* files. If you delete or update rows of those tables, the actual large
* object files are not deleted from the server file system. Therefore you may
* need to reclaim large object field space by deleting those files manually.
*
* @package MDB
* @category Database
* @author Paul Cooper <pgc@ucecom.com>
*/
class MDB_pgsql extends MDB_Common
{
var $connection = 0;
var $connected_host;
var $connected_port;
var $selected_database = '';
var $opened_persistent = '';
var $escape_quotes = "\\";
var $decimal_factor = 1.0;
var $highest_fetched_row = array();
var $columns = array();
// }}}
// {{{ constructor
/**
* Constructor
*/
function MDB_pgsql()
{
$this->MDB_Common();
$this->phptype = 'pgsql';
$this->dbsyntax = 'pgsql';
$this->supported['Sequences'] = 1;
$this->supported['Indexes'] = 1;
$this->supported['SummaryFunctions'] = 1;
$this->supported['OrderByText'] = 1;
$this->supported['Transactions'] = 1;
$this->supported['CurrId'] = 1;
$this->supported['SelectRowRanges'] = 1;
$this->supported['LOBs'] = 1;
$this->supported['Replace'] = 1;
$this->supported['SubSelects'] = 1;
$this->decimal_factor = pow(10.0, $this->decimal_places);
}
// }}}
// {{{ errorCode()
/**
* Map native error codes to DB's portable ones. Requires that
* the DB implementation's constructor fills in the $errorcode_map
* property.
*
* @param $nativecode the native error code, as returned by the backend
* database extension (string or integer)
* @return int a portable MDB error code, or FALSE if this DB
* implementation has no mapping for the given error code.
*/
function errorCode($errormsg)
{
static $error_regexps;
if (empty($error_regexps)) {
$error_regexps = array(
'/([Tt]able does not exist\.|[Rr]elation [\"\'].*[\"\'] does not exist|[Ss]equence does not exist|[Cc]lass ".+" not found)$/' => MDB_ERROR_NOSUCHTABLE,
'/[Tt]able [\"\'].*[\"\'] does not exist/' => MDB_ERROR_NOSUCHTABLE,
'/[Rr]elation [\"\'].*[\"\'] already exists|[Cc]annot insert a duplicate key into (a )?unique index.*/' => MDB_ERROR_ALREADY_EXISTS,
'/divide by zero$/' => MDB_ERROR_DIVZERO,
'/pg_atoi: error in .*: can\'t parse /' => MDB_ERROR_INVALID_NUMBER,
'/ttribute [\"\'].*[\"\'] not found$|[Rr]elation [\"\'].*[\"\'] does not have attribute [\"\'].*[\"\']/' => MDB_ERROR_NOSUCHFIELD,
'/parser: parse error at or near \"/' => MDB_ERROR_SYNTAX,
'/syntax error at/' => MDB_ERROR_SYNTAX,
'/violates not-null constraint/' => MDB_ERROR_CONSTRAINT_NOT_NULL,
'/violates [\w ]+ constraint/' => MDB_ERROR_CONSTRAINT,
'/referential integrity violation/' => MDB_ERROR_CONSTRAINT,
'/deadlock detected/' => MDB_ERROR_DEADLOCK
);
}
foreach ($error_regexps as $regexp => $code) {
if (preg_match($regexp, $errormsg)) {
return($code);
}
}
// Fall back to MDB_ERROR if there was no mapping.
return(MDB_ERROR);
}
// }}}
// {{{ pgsqlRaiseError()
/**
* This method is used to communicate an error and invoke error
* callbacks etc. Basically a wrapper for MDB::raiseError
* that checks for native error msgs.
*
* @param integer $errno error code
* @param string $message userinfo message
* @return object a PEAR error object
* @access public
* @see PEAR_Error
*/
function pgsqlRaiseError($errno = NULL, $message = NULL)
{
if ($this->connection) {
$error = @pg_errormessage($this->connection);
} else {
$error = @pg_errormessage();
}
return($this->raiseError($this->errorCode($error), NULL, NULL, $message, $error));
}
// }}}
// {{{ errorNative()
/**
* Get the native error code of the last error (if any) that
* occured on the current connection.
*
* @access public
*
* @return int native pgsql error code
*/
function errorNative()
{
return @pg_errormessage($this->connection);
}
// }}}
// {{{ autoCommit()
/**
* Define whether database changes done on the database be automatically
* committed. This function may also implicitly start or end a transaction.
*
* @param boolean $auto_commit flag that indicates whether the database
* changes should be committed right after executing every query
* statement. If this argument is 0 a transaction implicitly started.
* Otherwise, if a transaction is in progress it is ended by committing
* any database changes that were pending.
* @return mixed MDB_OK on success, a MDB error on failure
* @access public
*/
function autoCommit($auto_commit)
{
$this->debug('AutoCommit: '.($auto_commit ? 'On' : 'Off'));
if ($this->auto_commit == $auto_commit) {
return(MDB_OK);
}
if ($this->connection) {
if (MDB::isError($result = $this->_doQuery($auto_commit ? 'END' : 'BEGIN')))
return($result);
}
$this->auto_commit = $auto_commit;
$this->in_transaction = !$auto_commit;
return(MDB_OK);
}
// }}}
// {{{ commit()
/**
* Commit the database changes done during a transaction 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 committing the pending changes.
*
* @return mixed MDB_OK on success, a MDB error on failure
* @access public
*/
function commit()
{
$this->debug('Commit Transaction');
if ($this->auto_commit) {
return($this->raiseError(MDB_ERROR, NULL, NULL, 'Commit: transaction changes are being auto commited'));
}
return($this->_doQuery('COMMIT') && $this->_doQuery('BEGIN'));
}
// }}}
// {{{ rollback()
/**
* Cancel any database changes done during a transaction 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.
*
* @return mixed MDB_OK on success, a MDB error on failure
* @access public
*/
function rollback()
{
$this->debug('Rollback Transaction');
if ($this->auto_commit) {
return($this->raiseError(MDB_ERROR, NULL, NULL, 'Rollback: transactions can not be rolled back when changes are auto commited'));
}
return($this->_doQuery('ROLLBACK') && $this->_doQuery('BEGIN'));
}
// }}}
// {{{ _doConnect()
/**
* Does the grunt work of connecting to the database
*
* @return mixed connection resource on success, MDB_Error on failure
* @access private
**/
function _doConnect($database_name, $persistent)
{
$function = ($persistent ? 'pg_pconnect' : 'pg_connect');
if (!function_exists($function)) {
return($this->raiseError(MDB_ERROR_UNSUPPORTED, NULL, NULL, 'doConnect: PostgreSQL support is not available in this PHP configuration'));
}
$port = (isset($this->port) ? $this->port : '');
if ($database_name == '') {
$database_name = 'template1';
}
$connect_string = 'dbname='.$database_name;
if ($this->host != '') {
$connect_string .= ' host='.$this->host;
}
if ($port != '') {
$connect_string .= ' port='.strval($port);
}
if ($this->user != '') {
$connect_string .= ' user='.$this->user;
}
if ($this->password != '') {
$connect_string .= ' password='.$this->password;
}
putenv('PGDATESTYLE=ISO');
if (($connection = @$function($connect_string)) > 0) {
return($connection);
}
if (isset($php_errormsg)) {
$error_msg = $php_errormsg;
} else {
$error_msg = 'Could not connect to PostgreSQL server';
}
return($this->raiseError(MDB_ERROR_CONNECT_FAILED, NULL, NULL, 'doConnect: '.$error_msg));
}
// }}}
// {{{ connect()
/**
* Connect to the database
*
* @return TRUE on success, MDB_Error on failure
* @access public
**/
function connect()
{
$port = (isset($this->options['port']) ? $this->options['port'] : '');
if($this->connection != 0) {
if (!strcmp($this->connected_host, $this->host)
&& !strcmp($this->connected_port, $port)
&& !strcmp($this->selected_database, $this->database_name)
&& ($this->opened_persistent == $this->options['persistent']))
{
return(MDB_OK);
}
@pg_close($this->connection);
$this->affected_rows = -1;
$this->connection = 0;
}
if(!PEAR::loadExtension($this->phptype)) {
return(PEAR::raiseError(NULL, MDB_ERROR_NOT_FOUND,
NULL, NULL, 'extension '.$this->phptype.' is not compiled into PHP',
'MDB_Error', TRUE));
}
if(function_exists('pg_cmdTuples')) {
$connection = $this->_doConnect('template1', 0);
if (!MDB::isError($connection)) {
if (($result = @pg_exec($connection, 'BEGIN'))) {
$error_reporting = error_reporting(63);
@pg_cmdtuples($result);
if (!isset($php_errormsg) || strcmp($php_errormsg, 'This compilation does not support pg_cmdtuples()')) {
$this->supported['AffectedRows'] = 1;
}
error_reporting($error_reporting);
} else {
$err = $this->raiseError(MDB_ERROR, NULL, NULL, 'Setup: '.@pg_errormessage($connection));
}
@pg_close($connection);
} else {
$err = $this->raiseError(MDB_ERROR, NULL, NULL, 'Setup: could not execute BEGIN');
}
if (isset($err) && MDB::isError($err)) {
return($err);
}
}
$connection = $this->_doConnect($this->database_name, $this->options['persistent']);
if (MDB::isError($connection)) {
return($connection);
}
$this->connection = $connection;
if (!$this->auto_commit && MDB::isError($trans_result = $this->_doQuery('BEGIN'))) {
pg_Close($this->connection);
$this->connection = 0;
$this->affected_rows = -1;
return($trans_result);
}
$this->connected_host = $this->host;
$this->connected_port = $port;
$this->selected_database = $this->database_name;
$this->opened_persistent = $this->options['persistent'];
return(MDB_OK);
}
// }}}
// {{{ _close()
/**
* Close the database connection
*
* @return boolean
* @access private
**/
function _close()
{
if ($this->connection != 0) {
if (!$this->auto_commit) {
$this->_doQuery('END');
}
@pg_close($this->connection);
$this->connection = 0;
$this->affected_rows = -1;
unset($GLOBALS['_MDB_databases'][$this->database]);
return(MDB_OK);
}
return(MDB_ERROR);
}
// }}}
// {{{ _doQuery()
/**
* Execute a query
* @param string $query the SQL query
* @return mixed result identifier if query executed, else MDB_error
* @access private
**/
function _doQuery($query)
{
if (($result = @pg_Exec($this->connection, $query))) {
$this->affected_rows = (isset($this->supported['AffectedRows']) ? @pg_cmdtuples($result) : -1);
} else {
$error = @pg_errormessage($this->connection);
return($this->pgsqlRaiseError());
}
return($result);
}
// }}}
// {{{ _standaloneQuery()
/**
* execute a query
*
* @param string $query
* @return
* @access private
*/
function _standaloneQuery($query)
{
if (($connection = $this->_doConnect('template1', 0)) == 0) {
return($this->raiseError(MDB_ERROR_CONNECT_FAILED, NULL, NULL, '_standaloneQuery: Cannot connect to template1'));
}
if (!($result = @pg_Exec($connection, $query))) {
$this->raiseError(MDB_ERROR, NULL, NULL, '_standaloneQuery: ' . @pg_errormessage($connection));
}
pg_Close($connection);
return($result);
}
// }}}
// {{{ query()
/**
* Send a query to the database and return any results
*
* @param string $query the SQL query
* @param array $types array that contains the types of the columns in
* the result set
* @return mixed result identifier if query executed, else MDB_error
* @access public
**/
function query($query, $types = NULL)
{
$this->debug("Query: $query");
$ismanip = MDB::isManip($query);
$this->last_query = $query;
$first = $this->first_selected_row;
$limit = $this->selected_row_limit;
$this->first_selected_row = $this->selected_row_limit = 0;
$connected = $this->connect();
if (MDB::isError($connected)) {
return($connected);
}
if (!$ismanip && $limit > 0) {
if ($this->auto_commit && MDB::isError($this->_doQuery('BEGIN'))) {
return($this->raiseError(MDB_ERROR));
}
$result = $this->_doQuery('DECLARE select_cursor SCROLL CURSOR FOR '.$query);
if (!MDB::isError($result)) {
if ($first > 0 && MDB::isError($result = $this->_doQuery("MOVE FORWARD $first FROM select_cursor"))) {
$this->freeResult($result);
return($result);
}
if (MDB::isError($result = $this->_doQuery("FETCH FORWARD $limit FROM select_cursor"))) {
$this->freeResult($result);
return($result);
}
} else {
return($result);
}
if ($this->auto_commit && MDB::isError($result2 = $this->_doQuery('END'))) {
$this->freeResult($result);
return($result2);
}
} else {
$result = $this->_doQuery($query);
if (MDB::isError($result)) {
return($result);
}
}
if ($ismanip) {
$this->affected_rows = @pg_cmdtuples($result);
return(MDB_OK);
} elseif ((preg_match('/^\s*\(?\s*SELECT\s+/si', $query)
&& !preg_match('/^\s*\(?\s*SELECT\s+INTO\s/si', $query)
) || preg_match('/^\s*EXPLAIN/si',$query )
) {
/* PostgreSQL commands:
ABORT, ALTER, BEGIN, CLOSE, CLUSTER, COMMIT, COPY,
CREATE, DECLARE, DELETE, DROP TABLE, EXPLAIN, FETCH,
GRANT, INSERT, LISTEN, LOAD, LOCK, MOVE, NOTIFY, RESET,
REVOKE, ROLLBACK, SELECT, SELECT INTO, SET, SHOW,
UNLISTEN, UPDATE, VACUUM
*/
$result_value = intval($result);
$this->highest_fetched_row[$result_value] = -1;
if ($types != NULL) {
if (!is_array($types)) {
$types = array($types);
}
if (MDB::isError($err = $this->setResultTypes($result, $types))) {
$this->freeResult($result);
return($err);
}
}
return($result);
} else {
$this->affected_rows = 0;
return(MDB_OK);
}
return($this->raiseError(MDB_ERROR));
}
// }}}
// {{{ getColumnNames()
/**
* Retrieve the names of columns returned by the DBMS in a query result.
*
* @param resource $result result identifier
* @return mixed associative array variable
* that holds the names of columns. The indexes of the array are
* the column names mapped to lower case and the values are the
* respective numbers of the columns starting from 0. Some DBMS may
* not return any columns when the result set does not contain any
* rows.
* a MDB error on failure
* @access public
*/
function getColumnNames($result)
{
$result_value = intval($result);
if (!isset($this->highest_fetched_row[$result_value])) {
return($this->raiseError(MDB_ERROR, NULL, NULL, 'Get Column Names: specified an nonexistant result set'));
}
if (!isset($this->columns[$result_value])) {
$this->columns[$result_value] = array();
$columns = @pg_numfields($result);
for($column = 0; $column < $columns; $column++) {
$field_name = @pg_fieldname($result, $column);
if ($this->options['optimize'] == 'portability') {
$field_name = strtolower($field_name);
}
$this->columns[$result_value][$field_name] = $column;
}
}
return($this->columns[$result_value]);
}
// }}}
// {{{ numCols()
/**
* Count the number of columns returned by the DBMS in a query result.
*
* @param resource $result result identifier
* @return mixed integer value with the number of columns, a MDB error
* on failure
* @access public
*/
function numCols($result)
{
$result_value = intval($result);
if (!isset($this->highest_fetched_row[$result_value])) {
return($this->raiseError(MDB_ERROR, NULL, NULL, 'numCols: specified an nonexistant result set'));
}
return(pg_numfields($result));
}
// }}}
// {{{ endOfResult()
/**
* check if the end of the result set has been reached
*
* @param resource $result result identifier
* @return mixed TRUE or FALSE on sucess, a MDB error on failure
* @access public
*/
function endOfResult($result)
{
$result_value = intval($result);
if (!isset($this->highest_fetched_row[$result_value])) {
return($this->raiseError(MDB_ERROR, NULL, NULL, 'End of result attempted to check the end of an unknown result'));
}
return($this->highest_fetched_row[$result_value] >= $this->numRows($result) - 1);
}
// }}}
// {{{ fetch()
/**
* fetch value from a result set
*
* @param resource $result result identifier
* @param int $row number of the row where the data can be found
* @param int $field field number where the data can be found
* @return mixed string on success, a MDB error on failure
* @access public
*/
function fetch($result, $row, $field)
{
$result_value = intval($result);
$this->highest_fetched_row[$result_value] = max($this->highest_fetched_row[$result_value], $row);
$res = @pg_result($result, $row, $field);
if ($res === FALSE && $res != NULL) {
return($this->pgsqlRaiseError());
}
return($res);
}
// }}}
// {{{ _retrieveLob()
/**
* fetch a float value from a result set
*
* @param int $lob handle to a lob created by the createLob() function
* @return mixed MDB_OK on success, a MDB error on failure
* @access private
*/
function _retrieveLob($lob)
{
if (!isset($this->lobs[$lob])) {
return($this->raiseError(MDB_ERROR_INVALID, NULL, NULL,
'Retrieve LOB: did not specified a valid lob'));
}
if (!isset($this->lobs[$lob]['Value'])) {
if ($this->auto_commit) {
if (!@pg_exec($this->connection, 'BEGIN')) {
return($this->raiseError(MDB_ERROR, NULL, NULL,
'Retrieve LOB: ' . @pg_errormessage($this->connection)));
}
$this->lobs[$lob]['InTransaction'] = 1;
}
$this->lobs[$lob]['Value'] = $this->fetch($this->lobs[$lob]['Result'], $this->lobs[$lob]['Row'], $this->lobs[$lob]['Field']);
if (!($this->lobs[$lob]['Handle'] = @pg_loopen($this->connection, $this->lobs[$lob]['Value'], 'r'))) {
if (isset($this->lobs[$lob]['InTransaction'])) {
@pg_exec($this->connection, 'END');
unset($this->lobs[$lob]['InTransaction']);
}
unset($this->lobs[$lob]['Value']);
return($this->raiseError(MDB_ERROR, NULL, NULL,
'Retrieve LOB: ' . @pg_errormessage($this->connection)));
}
}
return(MDB_OK);
}
// }}}
// {{{ endOfResultLob()
/**
* Determine whether it was reached the end of the large object and
* therefore there is no more data to be read for the its input stream.
*
* @param int $lob handle to a lob created by the createLob() function
* @return mixed TRUE or FALSE on success, a MDB error on failure
* @access public
*/
function endOfResultLob($lob)
{
$lobresult = $this->_retrieveLob($lob);
if (MDB::isError($lobresult)) {
return($lobresult);
}
return(isset($this->lobs[$lob]['EndOfLOB']));
}
// }}}
// {{{ _readResultLob()
/**
* Read data from large object input stream.
*
* @param int $lob handle to a lob created by the createLob() function
* @param blob $data reference to a variable that will hold data to be
* read from the large object input stream
* @param int $length integer value that indicates the largest ammount of
* data to be read from the large object input stream.
* @return mixed length on success, a MDB error on failure
* @access private
*/
function _readResultLob($lob, &$data, $length)
{
$lobresult = $this->_retrieveLob($lob);
if (MDB::isError($lobresult)) {
return($lobresult);
}
$data = @pg_loread($this->lobs[$lob]['Handle'], $length);
if (gettype($data) != 'string') {
$this->raiseError(MDB_ERROR, NULL, NULL,
'Read Result LOB: ' . @pg_errormessage($this->connection));
}
if (($length = strlen($data)) == 0) {
$this->lobs[$lob]['EndOfLOB'] = 1;
}
return($length);
}
// }}}
// {{{ _destroyResultLob()
/**
* Free any resources allocated during the lifetime of the large object
* handler object.
*
* @param int $lob handle to a lob created by the createLob() function
* @access private
*/
function _destroyResultLob($lob)
{
if (isset($this->lobs[$lob])) {
if (isset($this->lobs[$lob]['Value'])) {
@pg_loclose($this->lobs[$lob]['Handle']);
if (isset($this->lobs[$lob]['InTransaction'])) {
@pg_exec($this->connection, 'END');
}
}
$this->lobs[$lob] = '';
}
}
// }}}
// {{{ fetchClob()
/**
* fetch a clob value from a result set
*
* @param resource $result result identifier
* @param int $row number of the row where the data can be found
* @param int $field field number where the data can be found
* @return mixed content of the specified data cell, a MDB error on failure,
* a MDB error on failure
* @access public
*/
function fetchClob($result, $row, $field)
{
return($this->fetchLob($result, $row, $field));
}
// }}}
// {{{ fetchBlob()
/**
* fetch a blob value from a result set
*
* @param resource $result result identifier
* @param int $row number of the row where the data can be found
* @param int $field field number where the data can be found
* @return mixed content of the specified data cell, a MDB error on failure
* @access public
*/
function fetchBlob($result, $row, $field)
{
return($this->fetchLob($result, $row, $field));
}
// }}}
// {{{ convertResult()
/**
* convert a value to a RDBMS indepdenant MDB type
*
* @param mixed $value value to be converted
* @param int $type constant that specifies which type to convert to
* @return mixed converted value or a MDB error on failure
* @access public
*/
function convertResult($value, $type)
{
switch ($type) {
case MDB_TYPE_DECIMAL:
return(sprintf('%.'.$this->decimal_places.'f',doubleval($value)/$this->decimal_factor));
case MDB_TYPE_TIMESTAMP:
return substr($value, 0, strlen('YYYY-MM-DD HH:MM:SS'));
default:
return($this->_baseConvertResult($value, $type));
}
}
// }}}
// {{{ resultIsNull()
/**
* Determine whether the value of a query result located in given row and
* field is a NULL.
*
* @param resource $result result identifier
* @param int $row number of the row where the data can be found
* @param int $field field number where the data can be found
* @return mixed TRUE or FALSE on success, a MDB error on failure
* @access public
*/
function resultIsNull($result, $row, $field)
{
$result_value = intval($result);
$this->highest_fetched_row[$result_value] = max($this->highest_fetched_row[$result_value], $row);
return(@pg_fieldisnull($result, $row, $field));
}
// }}}
// {{{ numRows()
/**
* returns the number of rows in a result object
*
* @param ressource $result a valid result ressouce pointer
* @return mixed MDB_Error or the number of rows
* @access public
*/
function numRows($result)
{
return(@pg_numrows($result));
}
// }}}
// {{{ freeResult()
/**
* Free the internal resources associated with $result.
*
* @param $result result identifier
* @return boolean TRUE on success, FALSE if $result is invalid
* @access public
*/
function freeResult($result)
{
$result_value = intval($result);
if(isset($this->highest_fetched_row[$result_value])) {
unset($this->highest_fetched_row[$result_value]);
}
if(isset($this->columns[$result_value])) {
unset($this->columns[$result_value]);
}
if(isset($this->result_types[$result_value])) {
unset($this->result_types[$result_value]);
}
return(@pg_freeresult($result));
}
// }}}
// {{{ getTextDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare an text type
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param string $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* length
* Integer value that determines the maximum length of the text
* field. If this argument is missing the field should be
* declared to have the longest length allowed by the DBMS.
*
* default
* Text value to be used as default for this field.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to NULL.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access public
*/
function getTextDeclaration($name, $field)
{
return((isset($field['length']) ? "$name VARCHAR (" . $field['length'] . ')' : "$name TEXT") . (isset($field['default']) ? " DEFAULT '" . $field['default'] . "'" : '') . (isset($field['notnull']) ? ' NOT NULL' : ''));
}
// }}}
// {{{ getClobDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare an character
* large object type field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param string $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* length
* Integer value that determines the maximum length of the large
* object field. If this argument is missing the field should be
* declared to have the longest length allowed by the DBMS.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to NULL.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access public
*/
function getClobDeclaration($name, $field)
{
return("$name OID".(isset($field['notnull']) ? ' NOT NULL' : ''));
}
// }}}
// {{{ getBlobDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare an binary large
* object type field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param string $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* length
* Integer value that determines the maximum length of the large
* object field. If this argument is missing the field should be
* declared to have the longest length allowed by the DBMS.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to NULL.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access public
*/
function getBlobDeclaration($name, $field)
{
return("$name OID".(isset($field['notnull']) ? ' NOT NULL' : ''));
}
// }}}
// {{{ getDateDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare a date type
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param string $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* default
* Date value to be used as default for this field.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to NULL.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access public
*/
function getDateDeclaration($name, $field)
{
return($name.' DATE'.(isset($field['default']) ? ' DEFAULT \''.$field['default'] . "'" : '').(isset($field['notnull']) ? ' NOT NULL' : ''));
}
// }}}
// {{{ getTimeDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare a time
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param string $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* default
* Time value to be used as default for this field.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to NULL.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access public
*/
function getTimeDeclaration($name, $field)
{
return($name.' TIME'.(isset($field['default']) ? ' DEFAULT \''.$field['default'].'\'' : '').(isset($field['notnull']) ? ' NOT NULL' : ''));
}
// }}}
// {{{ getFloatDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare a float type
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param string $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* default
* Float value to be used as default for this field.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to NULL.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access public
*/
function getFloatDeclaration($name, $field)
{
return("$name FLOAT8 ".(isset($field['default']) ? ' DEFAULT '.$this->getFloatValue($field['default']) : '').(isset($field['notnull']) ? ' NOT NULL' : ''));
}
// }}}
// {{{ getDecimalDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare a decimal type
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param string $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* default
* Decimal value to be used as default for this field.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to NULL.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access public
*/
function getDecimalDeclaration($name, $field)
{
return("$name INT8 ".(isset($field['default']) ? ' DEFAULT '.$this->getDecimalValue($field['default']) : '').(isset($field['notnull']) ? ' NOT NULL' : ''));
}
// }}}
// {{{ _getLobValue()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param resource $prepared_query query handle from prepare()
* @param $parameter
* @param $lob
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access private
*/
function _getLobValue($prepared_query, $parameter, $lob)
{
$connect = $this->connect();
if (MDB::isError($connect)) {
return($connect);
}
if ($this->auto_commit && !@pg_exec($this->connection, 'BEGIN')) {
return($this->raiseError(MDB_ERROR, NULL, NULL,
'_getLobValue: error starting transaction'));
}
if (($lo = @pg_locreate($this->connection))) {
if (($handle = @pg_loopen($this->connection, $lo, 'w'))) {
while (!$this->endOfLob($lob)) {
$result = $this->readLob($lob, $data, $this->options['lob_buffer_length']);
if (MDB::isError($result)) {
break;
}
if (!@pg_lowrite($handle, $data)) {
$result = $this->raiseError(MDB_ERROR, NULL, NULL,
'Get LOB field value: ' . @pg_errormessage($this->connection));
break;
}
}
@pg_loclose($handle);
if (!MDB::isError($result)) {
$value = strval($lo);
}
} else {
$result = $this->raiseError(MDB_ERROR, NULL, NULL,
'Get LOB field value: ' . @pg_errormessage($this->connection));
}
if (MDB::isError($result)) {
$result = @pg_lounlink($this->connection, $lo);
}
} else {
$result = $this->raiseError(MDB_ERROR, NULL, NULL, 'Get LOB field value: ' . pg_ErrorMessage($this->connection));
}
if ($this->auto_commit) {
@pg_exec($this->connection, 'END');
}
if (MDB::isError($result)) {
return($result);
}
return($value);
}
// }}}
// {{{ getClobValue()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param resource $prepared_query query handle from prepare()
* @param $parameter
* @param $clob
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access public
*/
function getClobValue($prepared_query, $parameter, $clob)
{
return($this->_getLobValue($prepared_query, $parameter, $clob));
}
// }}}
// {{{ getBlobValue()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param resource $prepared_query query handle from prepare()
* @param $parameter
* @param $blob
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access public
*/
function getBlobValue($prepared_query, $parameter, $blob)
{
return($this->_getLobValue($prepared_query, $parameter, $blob));
}
// }}}
// {{{ getFloatValue()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param string $value text string value that is intended to be converted.
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access public
*/
function getFloatValue($value)
{
return(($value === NULL) ? 'NULL' : $value);
}
// }}}
// {{{ getDecimalValue()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param string $value text string value that is intended to be converted.
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access public
*/
function getDecimalValue($value)
{
return(($value === NULL) ? 'NULL' : strval(round($value*$this->decimal_factor)));
}
// }}}
// {{{ nextId()
/**
* returns the next free id of a sequence
*
* @param string $seq_name name of the sequence
* @param boolean $ondemand when TRUE the seqence is
* automatic created, if it
* not exists
* @return mixed MDB_Error or id
* @access public
*/
function nextId($seq_name, $ondemand = TRUE)
{
$seqname = $this->getSequenceName($seq_name);
$repeat = 0;
do {
$this->pushErrorHandling(PEAR_ERROR_RETURN);
$result = $this->query("SELECT NEXTVAL('$seqname')");
$this->popErrorHandling();
if ($ondemand && MDB::isError($result) && $result->getCode() == MDB_ERROR_NOSUCHTABLE) {
$repeat = 1;
$result = $this->createSequence($seq_name);
if (MDB::isError($result)) {
return($this->raiseError($result));
}
} else {
$repeat = 0;
}
} while ($repeat);
if (MDB::isError($result)) {
return($this->raiseError($result));
}
return($this->fetchOne($result));
}
// }}}
// {{{ currId()
/**
* returns the current id of a sequence
*
* @param string $seq_name name of the sequence
* @return mixed MDB_Error or id
* @access public
*/
function currId($seq_name)
{
$seqname = $this->getSequenceName($seq_name);
if (MDB::isError($result = $this->queryOne("SELECT last_value FROM $seqname"))) {
return($this->raiseError(MDB_ERROR, NULL, NULL, 'currId: Unable to select from ' . $seqname) );
}
if (!is_numeric($result)) {
return($this->raiseError(MDB_ERROR, NULL, NULL, 'currId: could not find value in sequence table'));
}
return($result);
}
// }}}
// {{{ fetchInto()
/**
* Fetch a row and return data in an array.
*
* @param resource $result result identifier
* @param int $fetchmode ignored
* @param int $rownum the row number to fetch
* @return mixed data array or NULL on success, a MDB error on failure
* @access public
*/
function fetchInto($result, $fetchmode = MDB_FETCHMODE_DEFAULT, $rownum = NULL)
{
$result_value = intval($result);
if ($fetchmode == MDB_FETCHMODE_DEFAULT) {
$fetchmode = $this->fetchmode;
}
if (is_null($rownum)) {
++$this->highest_fetched_row[$result_value];
} else {
$this->highest_fetched_row[$result_value] =
max($this->highest_fetched_row[$result_value], $rownum);
}
if ($fetchmode & MDB_FETCHMODE_ASSOC) {
$row = @pg_fetch_array($result, $rownum, PGSQL_ASSOC);
if (is_array($row) && $this->options['optimize'] == 'portability') {
$row = array_change_key_case($row, CASE_LOWER);
}
} else {
$row = @pg_fetch_row($result, $rownum);
}
if (!$row) {
if ($this->options['autofree']) {
$this->freeResult($result);
}
return(NULL);
}
if (isset($this->result_types[$result_value])) {
$row = $this->convertResultRow($result, $row);
}
return($row);
}
// }}}
// {{{ nextResult()
/**
* Move the internal pgsql result pointer to the next available result
*
* @param a valid fbsql result resource
* @return true if a result is available otherwise return false
* @access public
*/
function nextResult($result)
{
return(FALSE);
}
// }}}
// {{{ tableInfo()
/**
* returns meta data about the result set
*
* @param mixed $resource PostgreSQL result identifier or table name
* @param mixed $mode depends on implementation
* @return array an nested array, or a MDB error
* @access public
*/
function tableInfo($result, $mode = NULL)
{
$count = 0;
$id = 0;
$res = array();
/**
* depending on $mode, metadata returns the following values:
*
* - mode is FALSE (default):
* $result[]:
* [0]['table'] table name
* [0]['name'] field name
* [0]['type'] field type
* [0]['len'] field length
* [0]['flags'] field flags
*
* - mode is MDB_TABLEINFO_ORDER
* $result[]:
* ['num_fields'] number of metadata records
* [0]['table'] table name
* [0]['name'] field name
* [0]['type'] field type
* [0]['len'] field length
* [0]['flags'] field flags
* ['order'][field name] index of field named 'field name'
* The last one is used, if you have a field name, but no index.
* Test: if (isset($result['meta']['myfield'])) { ...
*
* - mode is MDB_TABLEINFO_ORDERTABLE
* the same as above. but additionally
* ['ordertable'][table name][field name] index of field
* named 'field name'
*
* this is, because if you have fields from different
* tables with the same field name * they override each
* other with MDB_TABLEINFO_ORDER
*
* you can combine MDB_TABLEINFO_ORDER and
* MDB_TABLEINFO_ORDERTABLE with MDB_TABLEINFO_ORDER |
* MDB_TABLEINFO_ORDERTABLE * or with MDB_TABLEINFO_FULL
**/
// if $result is a string, then we want information about a
// table without a resultset
if (is_string($result)) {
$id = @pg_exec($this->connection, "SELECT * FROM $result LIMIT 0");
if (empty($id)) {
return($this->pgsqlRaiseError());
}
} else { // else we want information about a resultset
$id = $result;
if (empty($id)) {
return($this->pgsqlRaiseError());
}
}
$count = @pg_numfields($id);
// made this IF due to performance (one if is faster than $count if's)
if (empty($mode)) {
for ($i = 0; $i < $count; $i++) {
$res[$i]['table'] = (is_string($result)) ? $result : '';
$res[$i]['name'] = @pg_fieldname ($id, $i);
$res[$i]['type'] = @pg_fieldtype ($id, $i);
$res[$i]['len'] = @pg_fieldsize ($id, $i);
$res[$i]['flags'] = (is_string($result)) ? $this->_pgFieldflags($id, $i, $result) : '';
}
} else { // full
$res['num_fields'] = $count;
for ($i = 0; $i < $count; $i++) {
$res[$i]['table'] = (is_string($result)) ? $result : '';
$res[$i]['name'] = @pg_fieldname ($id, $i);
$res[$i]['type'] = @pg_fieldtype ($id, $i);
$res[$i]['len'] = @pg_fieldsize ($id, $i);
$res[$i]['flags'] = (is_string($result)) ? $this->_pgFieldFlags($id, $i, $result) : '';
if ($mode & MDB_TABLEINFO_ORDER) {
$res['order'][$res[$i]['name']] = $i;
}
if ($mode & MDB_TABLEINFO_ORDERTABLE) {
$res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
}
}
}
// free the result only if we were called on a table
if (is_string($result) && is_resource($id)) {
@pg_freeresult($id);
}
return($res);
}
// }}}
// {{{ _pgFieldFlags()
/**
* Flags of a Field
*
* @param int $resource PostgreSQL result identifier
* @param int $num_field the field number
* @return string The flags of the field ('not_null', 'default_xx', 'primary_key',
* 'unique' and 'multiple_key' are supported)
* @access private
**/
function _pgFieldFlags($resource, $num_field, $table_name)
{
$field_name = @pg_fieldname($resource, $num_field);
$result = pg_exec($this->connection, "SELECT f.attnotnull, f.atthasdef
FROM pg_attribute f, pg_class tab, pg_type typ
WHERE tab.relname = typ.typname
AND typ.typrelid = f.attrelid
AND f.attname = '$field_name'
AND tab.relname = '$table_name'");
if (@pg_numrows($result) > 0) {
$row = @pg_fetch_row($result, 0);
$flags = ($row[0] == 't') ? 'not_null ' : '';
if ($row[1] == 't') {
$result = @pg_exec($this->connection, "SELECT a.adsrc
FROM pg_attribute f, pg_class tab, pg_type typ, pg_attrdef a
WHERE tab.relname = typ.typname AND typ.typrelid = f.attrelid
AND f.attrelid = a.adrelid AND f.attname = '$field_name'
AND tab.relname = '$table_name'");
$row = @pg_fetch_row($result, 0);
$num = str_replace('\'', '', $row[0]);
$flags .= "default_$num ";
}
}
$result = @pg_exec($this->connection, "SELECT i.indisunique, i.indisprimary, i.indkey
FROM pg_attribute f, pg_class tab, pg_type typ, pg_index i
WHERE tab.relname = typ.typname
AND typ.typrelid = f.attrelid
AND f.attrelid = i.indrelid
AND f.attname = '$field_name'
AND tab.relname = '$table_name'");
$count = @pg_numrows($result);
for ($i = 0; $i < $count ; $i++) {
$row = @pg_fetch_row($result, $i);
$keys = explode(' ', $row[2]);
if (in_array($num_field + 1, $keys)) {
$flags .= ($row[0] == 't') ? 'unique ' : '';
$flags .= ($row[1] == 't') ? 'primary ' : '';
if (count($keys) > 1)
$flags .= 'multiple_key ';
}
}
return trim($flags);
}
}
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