mirror of
https://gitlab.com/harald.mueller/aktuelle.kurse.git
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810 lines
26 KiB
PHP
810 lines
26 KiB
PHP
<?php
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//
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// +----------------------------------------------------------------------+
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// | PHP Version 4 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 1997-2002 The PHP Group |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2.02 of the PHP license, |
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// | that is bundled with this package in the file LICENSE, and is |
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// | available at through the world-wide-web at |
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// | http://www.php.net/license/2_02.txt. |
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// | If you did not receive a copy of the PHP license and are unable to |
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// | obtain it through the world-wide-web, please send a note to |
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// | license@php.net so we can mail you a copy immediately. |
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// +----------------------------------------------------------------------+
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// | Authors: Rui Hirokawa <rui_hirokawa@ybb.ne.jp> |
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// | Stig Bakken <ssb@fast.no> |
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// +----------------------------------------------------------------------+
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//
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// $Id: pgsql.php,v 1.65.2.3 2002/04/10 08:38:42 edink Exp $
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//
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// Database independent query interface definition for PHP's PostgreSQL
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// extension.
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//
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//
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// XXX legend:
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//
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// XXX ERRORMSG: The error message from the pgsql function should
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// be registered here.
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//
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require_once 'DB/common.php';
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class DB_pgsql extends DB_common
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{
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// {{{ properties
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var $connection;
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var $phptype, $dbsyntax;
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var $prepare_tokens = array();
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var $prepare_types = array();
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var $transaction_opcount = 0;
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var $dsn = array();
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var $row = array();
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var $num_rows = array();
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var $affected = 0;
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var $autocommit = true;
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var $fetchmode = DB_FETCHMODE_ORDERED;
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// }}}
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// {{{ constructor
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function DB_pgsql()
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{
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$this->DB_common();
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$this->phptype = 'pgsql';
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$this->dbsyntax = 'pgsql';
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$this->features = array(
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'prepare' => false,
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'pconnect' => true,
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'transactions' => true,
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'limit' => 'alter'
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);
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$this->errorcode_map = array(
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);
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}
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// }}}
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// {{{ connect()
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/**
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* Connect to a database and log in as the specified user.
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*
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* @param $dsn the data source name (see DB::parseDSN for syntax)
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* @param $persistent (optional) whether the connection should
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* be persistent
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*
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* @return int DB_OK on success, a DB error code on failure
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*/
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function connect($dsninfo, $persistent = false)
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{
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if (!DB::assertExtension('pgsql'))
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return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
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$this->dsn = $dsninfo;
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$protocol = (isset($dsninfo['protocol'])) ? $dsninfo['protocol'] : 'tcp';
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$connstr = '';
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if ($protocol == 'tcp') {
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if ($dsninfo['hostspec']) {
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$connstr = 'host=' . $dsninfo['hostspec'];
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}
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if ($dsninfo['port']) {
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$connstr .= ' port=' . $dsninfo['port'];
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}
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}
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if (isset($dsninfo['database'])) {
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$connstr .= ' dbname=' . $dsninfo['database'];
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}
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if (!empty($dsninfo['username'])) {
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$connstr .= ' user=' . $dsninfo['username'];
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}
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if (!empty($dsninfo['password'])) {
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$connstr .= ' password=' . $dsninfo['password'];
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}
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if (!empty($dsninfo['options'])) {
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$connstr .= ' options=' . $dsninfo['options'];
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}
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if (!empty($dsninfo['tty'])) {
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$connstr .= ' tty=' . $dsninfo['tty'];
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}
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$connect_function = $persistent ? 'pg_pconnect' : 'pg_connect';
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// catch error
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ob_start();
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$conn = $connect_function($connstr);
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$error = ob_get_contents();
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ob_end_clean();
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if ($conn == false) {
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return $this->raiseError(DB_ERROR_CONNECT_FAILED, null,
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null, null, strip_tags($error));
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}
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$this->connection = $conn;
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return DB_OK;
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}
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// }}}
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// {{{ disconnect()
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/**
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* Log out and disconnect from the database.
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*
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* @return bool TRUE on success, FALSE if not connected.
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*/
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function disconnect()
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{
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$ret = @pg_close($this->connection); // XXX ERRORMSG
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$this->connection = null;
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return $ret;
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}
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// }}}
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// {{{ simpleQuery()
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/**
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* Send a query to PostgreSQL and return the results as a
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* PostgreSQL resource identifier.
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*
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* @param $query the SQL query
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*
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* @return int returns a valid PostgreSQL result for successful SELECT
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* queries, DB_OK for other successful queries. A DB error code
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* is returned on failure.
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*/
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function simpleQuery($query)
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{
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$ismanip = DB::isManip($query);
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$this->last_query = $query;
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$query = $this->modifyQuery($query);
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if (!$this->autocommit && $ismanip) {
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if ($this->transaction_opcount == 0) {
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$result = @pg_exec($this->connection, "begin;");
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if (!$result) {
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return $this->pgsqlRaiseError();
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}
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}
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$this->transaction_opcount++;
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}
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$result = @pg_exec($this->connection, $query);
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if (!$result) {
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return $this->pgsqlRaiseError();
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}
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// Determine which queries that should return data, and which
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// should return an error code only.
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if ($ismanip) {
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$this->affected = @pg_cmdtuples($result);
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return DB_OK;
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} elseif (preg_match('/^\s*\(?\s*SELECT\s+/si', $query) &&
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!preg_match('/^\s*\(?\s*SELECT\s+INTO\s/si', $query)) {
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/* PostgreSQL commands:
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ABORT, ALTER, BEGIN, CLOSE, CLUSTER, COMMIT, COPY,
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CREATE, DECLARE, DELETE, DROP TABLE, EXPLAIN, FETCH,
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GRANT, INSERT, LISTEN, LOAD, LOCK, MOVE, NOTIFY, RESET,
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REVOKE, ROLLBACK, SELECT, SELECT INTO, SET, SHOW,
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UNLISTEN, UPDATE, VACUUM
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*/
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$this->row[$result] = 0; // reset the row counter.
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$numrows = $this->numrows($result);
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if (is_object($numrows)) {
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return $numrows;
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}
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$this->num_rows[$result] = $numrows;
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$this->affected = 0;
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return $result;
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} else {
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$this->affected = 0;
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return DB_OK;
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}
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}
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// }}}
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// {{{ nextResult()
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/**
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* Move the internal pgsql result pointer to the next available result
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*
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* @param a valid fbsql result resource
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*
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* @access public
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*
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* @return true if a result is available otherwise return false
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*/
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function nextResult($result)
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{
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return false;
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}
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// }}}
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// {{{ errorCode()
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/**
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* Map native error codes to DB's portable ones. Requires that
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* the DB implementation's constructor fills in the $errorcode_map
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* property.
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*
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* @param $nativecode the native error code, as returned by the backend
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* database extension (string or integer)
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*
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* @return int a portable DB error code, or FALSE if this DB
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* implementation has no mapping for the given error code.
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*/
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function errorCode($errormsg)
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{
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static $error_regexps;
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if (empty($error_regexps)) {
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$error_regexps = array(
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'/(Table does not exist\.|Relation [\"\'].*[\"\'] does not exist|sequence does not exist|class ".+" not found)$/' => DB_ERROR_NOSUCHTABLE,
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'/Relation [\"\'].*[\"\'] already exists|Cannot insert a duplicate key into (a )?unique index.*/' => DB_ERROR_ALREADY_EXISTS,
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'/divide by zero$/' => DB_ERROR_DIVZERO,
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'/pg_atoi: error in .*: can\'t parse /' => DB_ERROR_INVALID_NUMBER,
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'/ttribute [\"\'].*[\"\'] not found$|Relation [\"\'].*[\"\'] does not have attribute [\"\'].*[\"\']/' => DB_ERROR_NOSUCHFIELD,
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'/parser: parse error at or near \"/' => DB_ERROR_SYNTAX,
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'/referential integrity violation/' => DB_ERROR_CONSTRAINT
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);
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}
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foreach ($error_regexps as $regexp => $code) {
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if (preg_match($regexp, $errormsg)) {
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return $code;
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}
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}
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// Fall back to DB_ERROR if there was no mapping.
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return DB_ERROR;
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}
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// }}}
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/**
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* Fetch and return a row of data (it uses fetchInto for that)
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* @param $result PostgreSQL result identifier
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* @param $fetchmode format of fetched row array
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* @param $rownum the absolute row number to fetch
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*
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* @return array a row of data, or false on error
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*/
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function fetchRow($result, $fetchmode = DB_FETCHMODE_DEFAULT, $rownum=null)
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{
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if ($fetchmode == DB_FETCHMODE_DEFAULT) {
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$fetchmode = $this->fetchmode;
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}
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$res = $this->fetchInto ($result, $arr, $fetchmode, $rownum);
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if ($res !== DB_OK) {
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return $res;
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}
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return $arr;
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}
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// {{{ fetchInto()
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/**
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* Fetch a row and insert the data into an existing array.
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*
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* @param $result PostgreSQL result identifier
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* @param $row (reference) array where data from the row is stored
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* @param $fetchmode how the array data should be indexed
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* @param $rownum the row number to fetch
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*
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* @return int DB_OK on success, a DB error code on failure
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*/
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function fetchInto($result, &$row, $fetchmode, $rownum=null)
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{
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$rownum = ($rownum !== null) ? $rownum : $this->row[$result];
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if ($rownum >= $this->num_rows[$result]) {
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return null;
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}
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if ($fetchmode & DB_FETCHMODE_ASSOC) {
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$row = @pg_fetch_array($result, $rownum, PGSQL_ASSOC);
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} else {
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$row = @pg_fetch_row($result, $rownum);
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}
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if (!$row) {
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$err = pg_errormessage($this->connection);
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if (!$err) {
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return null;
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}
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return $this->pgsqlRaiseError();
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}
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$this->row[$result] = ++$rownum;
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return DB_OK;
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}
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// }}}
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// {{{ freeResult()
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/**
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* Free the internal resources associated with $result.
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*
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* @param $result int PostgreSQL result identifier or DB statement identifier
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*
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* @return bool TRUE on success, FALSE if $result is invalid
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*/
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function freeResult($result)
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{
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if (is_resource($result)) {
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return @pg_freeresult($result);
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}
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if (!isset($this->prepare_tokens[(int)$result])) {
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return false;
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}
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unset($this->prepare_tokens[(int)$result]);
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unset($this->prepare_types[(int)$result]);
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unset($this->row[(int)$result]);
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unset($this->num_rows[(int)$result]);
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$this->affected = 0;
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return true;
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}
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// }}}
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// {{{ quote()
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/**
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* Quote the given string so it can be safely used within string delimiters
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* in a query.
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* @param $string mixed Data to be quoted
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* @return mixed "NULL" string, quoted string or original data
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*/
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function quote($str = null)
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{
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switch (strtolower(gettype($str))) {
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case 'null':
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return 'NULL';
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case 'integer':
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case 'double' :
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return $str;
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case 'string':
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default:
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$str = str_replace("'", "''", $str);
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//PostgreSQL treats a backslash as an escape character.
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$str = str_replace('\\', '\\\\', $str);
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return "'$str'";
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}
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}
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// }}}
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// {{{ numCols()
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/**
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* Get the number of columns in a result set.
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*
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* @param $result resource PostgreSQL result identifier
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*
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* @return int the number of columns per row in $result
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*/
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function numCols($result)
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{
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$cols = @pg_numfields($result);
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if (!$cols) {
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return $this->pgsqlRaiseError();
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}
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return $cols;
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}
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// }}}
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// {{{ numRows()
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/**
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* Get the number of rows in a result set.
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*
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* @param $result resource PostgreSQL result identifier
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*
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* @return int the number of rows in $result
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*/
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function numRows($result)
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{
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$rows = @pg_numrows($result);
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if ($rows === null) {
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return $this->pgsqlRaiseError();
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}
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return $rows;
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}
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// }}}
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// {{{ errorNative()
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/**
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* Get the native error code of the last error (if any) that
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* occured on the current connection.
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*
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* @return int native PostgreSQL error code
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*/
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function errorNative()
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{
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return pg_errormessage($this->connection);
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}
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// }}}
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// {{{ autoCommit()
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/**
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* Enable/disable automatic commits
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*/
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function autoCommit($onoff = false)
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{
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// XXX if $this->transaction_opcount > 0, we should probably
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// issue a warning here.
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$this->autocommit = $onoff ? true : false;
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return DB_OK;
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}
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// }}}
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// {{{ commit()
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/**
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* Commit the current transaction.
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*/
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function commit()
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{
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if ($this->transaction_opcount > 0) {
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// (disabled) hack to shut up error messages from libpq.a
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//@fclose(@fopen("php://stderr", "w"));
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$result = @pg_exec($this->connection, "end;");
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$this->transaction_opcount = 0;
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if (!$result) {
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return $this->pgsqlRaiseError();
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}
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}
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return DB_OK;
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}
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// }}}
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// {{{ rollback()
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/**
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* Roll back (undo) the current transaction.
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*/
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function rollback()
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{
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if ($this->transaction_opcount > 0) {
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$result = @pg_exec($this->connection, "abort;");
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$this->transaction_opcount = 0;
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if (!$result) {
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return $this->pgsqlRaiseError();
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}
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}
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return DB_OK;
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}
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// }}}
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// {{{ affectedRows()
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/**
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* Gets the number of rows affected by the last query.
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* if the last query was a select, returns 0.
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*
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* @return int number of rows affected by the last query or DB_ERROR
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*/
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function affectedRows()
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{
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return $this->affected;
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}
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// }}}
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// {{{ nextId()
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/**
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* Get the next value in a sequence.
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*
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* We are using native PostgreSQL sequences. If a sequence does
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* not exist, it will be created, unless $ondemand is false.
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*
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* @access public
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* @param string $seq_name the name of the sequence
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* @param bool $ondemand whether to create the sequence on demand
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* @return a sequence integer, or a DB error
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*/
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function nextId($seq_name, $ondemand = true)
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{
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$seqname = $this->getSequenceName($seq_name);
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$repeat = 0;
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do {
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$this->pushErrorHandling(PEAR_ERROR_RETURN);
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$result = $this->query("SELECT NEXTVAL('${seqname}')");
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$this->popErrorHandling();
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if ($ondemand && DB::isError($result) &&
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$result->getCode() == DB_ERROR_NOSUCHTABLE) {
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$repeat = 1;
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$result = $this->createSequence($seq_name);
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if (DB::isError($result)) {
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return $this->raiseError($result);
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}
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} else {
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$repeat = 0;
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}
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} while ($repeat);
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if (DB::isError($result)) {
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return $this->raiseError($result);
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}
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$arr = $result->fetchRow(DB_FETCHMODE_ORDERED);
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$result->free();
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return $arr[0];
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}
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// }}}
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// {{{ createSequence()
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/**
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* Create the sequence
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*
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* @param string $seq_name the name of the sequence
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* @return mixed DB_OK on success or DB error on error
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* @access public
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*/
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function createSequence($seq_name)
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{
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$seqname = $this->getSequenceName($seq_name);
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$this->pushErrorHandling(PEAR_ERROR_RETURN);
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$result = $this->query("CREATE SEQUENCE ${seqname}");
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$this->popErrorHandling();
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return $result;
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}
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// }}}
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// {{{ dropSequence()
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/**
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* Drop a sequence
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*
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* @param string $seq_name the name of the sequence
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* @return mixed DB_OK on success or DB error on error
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* @access public
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|
*/
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|
function dropSequence($seq_name)
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{
|
|
$seqname = $this->getSequenceName($seq_name);
|
|
return $this->query("DROP SEQUENCE ${seqname}");
|
|
}
|
|
|
|
// }}}
|
|
// {{{ modifyLimitQuery()
|
|
|
|
function modifyLimitQuery($query, $from, $count)
|
|
{
|
|
$query = $query . " LIMIT $count, $from";
|
|
return $query;
|
|
}
|
|
|
|
// }}}
|
|
// {{{ pgsqlRaiseError()
|
|
|
|
function pgsqlRaiseError($errno = null)
|
|
{
|
|
$native = $this->errorNative();
|
|
if ($errno === null) {
|
|
$err = $this->errorCode($native);
|
|
} else {
|
|
$err = $errno;
|
|
}
|
|
return $this->raiseError($err, null, null, null, $native);
|
|
}
|
|
|
|
// }}}
|
|
// {{{ _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);
|
|
}
|
|
|
|
// }}}
|
|
// {{{ tableInfo()
|
|
|
|
/**
|
|
* Returns information about a table or a result set
|
|
*
|
|
* NOTE: doesn't support table name and flags if called from a db_result
|
|
*
|
|
* @param mixed $resource PostgreSQL result identifier or table name
|
|
* @param int $mode A valid tableInfo mode (DB_TABLEINFO_ORDERTABLE or
|
|
* DB_TABLEINFO_ORDER)
|
|
*
|
|
* @return array An array with all the information
|
|
*/
|
|
function tableInfo($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 DB_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 DB_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 DB_TABLEINFO_ORDER
|
|
*
|
|
* you can combine DB_TABLEINFO_ORDER and
|
|
* DB_TABLEINFO_ORDERTABLE with DB_TABLEINFO_ORDER |
|
|
* DB_TABLEINFO_ORDERTABLE * or with DB_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 $result");
|
|
if (empty($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 & DB_TABLEINFO_ORDER) {
|
|
$res['order'][$res[$i]['name']] = $i;
|
|
}
|
|
if ($mode & DB_TABLEINFO_ORDERTABLE) {
|
|
$res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
|
|
}
|
|
}
|
|
}
|
|
|
|
// free the result only if we were called on a table
|
|
if (is_resource($id)) {
|
|
@pg_freeresult($id);
|
|
}
|
|
return $res;
|
|
}
|
|
|
|
// }}}
|
|
// {{{ getTablesQuery()
|
|
|
|
/**
|
|
* Returns the query needed to get some backend info
|
|
* @param string $type What kind of info you want to retrieve
|
|
* @return string The SQL query string
|
|
*/
|
|
function getSpecialQuery($type)
|
|
{
|
|
switch ($type) {
|
|
case 'tables': {
|
|
$sql = "SELECT c.relname as \"Name\"
|
|
FROM pg_class c, pg_user u
|
|
WHERE c.relowner = u.usesysid AND c.relkind = 'r'
|
|
AND not exists (select 1 from pg_views where viewname = c.relname)
|
|
AND c.relname !~ '^pg_'
|
|
UNION
|
|
SELECT c.relname as \"Name\"
|
|
FROM pg_class c
|
|
WHERE c.relkind = 'r'
|
|
AND not exists (select 1 from pg_views where viewname = c.relname)
|
|
AND not exists (select 1 from pg_user where usesysid = c.relowner)
|
|
AND c.relname !~ '^pg_'";
|
|
break;
|
|
}
|
|
case 'views': {
|
|
// Table cols: viewname | viewowner | definition
|
|
$sql = "SELECT viewname FROM pg_views";
|
|
break;
|
|
}
|
|
case 'users': {
|
|
// cols: usename |usesysid|usecreatedb|usetrace|usesuper|usecatupd|passwd |valuntil
|
|
$sql = 'SELECT usename FROM pg_user';
|
|
break;
|
|
}
|
|
case 'databases': {
|
|
$sql = 'SELECT datname FROM pg_database';
|
|
break;
|
|
}
|
|
case 'functions': {
|
|
$sql = 'SELECT proname FROM pg_proc';
|
|
break;
|
|
}
|
|
default:
|
|
return null;
|
|
}
|
|
return $sql;
|
|
}
|
|
|
|
// }}}
|
|
|
|
}
|
|
|
|
// Local variables:
|
|
// tab-width: 4
|
|
// c-basic-offset: 4
|
|
// End:
|
|
?>
|