pgsql.php

apache windows下的一款好

<?php
//
// +----------------------------------------------------------------------+
// | PHP version 4.0                                                      |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2001 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license,      |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Rui Hirokawa <[e-mail]>                     |
// |          Stig Bakken <[e-mail]>                                   |
// +----------------------------------------------------------------------+
//
// $Id: pgsql.php,v 1.46.2.2 2001/11/13 01:26:42 ssb Exp $
//
// Database independent query interface definition for PHP's PostgreSQL
// extension.
//

//
// XXX legend:
//
// XXX ERRORMSG: The error message from the pgsql function should
//               be registered here.
//

require_once 'DB/common.php';

class DB_pgsql extends DB_common
{
    // {{{ properties

    var $connection;
    var $phptype, $dbsyntax;
    var $prepare_tokens = array();
    var $prepare_types = array();
    var $transaction_opcount = 0;
    var $dsn = array();
    var $row = array();
    var $num_rows = array();
    var $affected = 0;
    var $autocommit = true;
    var $fetchmode = DB_FETCHMODE_ORDERED;

    // }}}
    // {{{ constructor

    function DB_pgsql()
    {
        $this->DB_common();
        $this->phptype = 'pgsql';
        $this->dbsyntax = 'pgsql';
        $this->features = array(
            'prepare' => false,
            'pconnect' => true,
            'transactions' => true,
            'limit' => 'alter'
        );
        $this->errorcode_map = array(
        );
    }

    // }}}
    // {{{ connect()

    /**
     * Connect to a database and log in as the specified user.
     *
     * @param $dsn the data source name (see DB::parseDSN for syntax)
     * @param $persistent (optional) whether the connection should
     *        be persistent
     *
     * @return int DB_OK on success, a DB error code on failure
     */
    function connect($dsninfo, $persistent = false)
    {
        if (!DB::assertExtension('pgsql'))
            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);

        $this->dsn = $dsninfo;
        $host = $dsninfo['hostspec'];
        $protocol = (isset($dsninfo['protocol'])) ? $dsninfo['protocol'] : '';
        $connstr = '';
        if (($host !== false) && ($protocol != 'unix')){
            if (($pos = strpos($host, ':')) !== false) {
                $dbhost = substr($host, 0, $pos);
                $port = substr($host, $pos + 1);
            } else {
                $dbhost = $host;
                $port = '5432';
            }
            $connstr = 'host=' . $dbhost . ' port=' . $port;
        }

        if (isset($dsninfo['database'])) {
            $connstr .= ' dbname=' . $dsninfo['database'];
        }
        if (isset($dsninfo['username'])) {
            $connstr .= ' user=' . $dsninfo['username'];
        }
        if (isset($dsninfo['password'])) {
            $connstr .= ' password=' . $dsninfo['password'];
        }
        if (!empty($dsninfo['options'])) {
            $connstr .= ' options=' . $dsninfo['options'];
        }
        if (!empty($dsninfo['tty'])) {
            $connstr .= ' tty=' . $dsninfo['tty'];
        }

        $connect_function = $persistent ? 'pg_pconnect' : 'pg_connect';
        // catch error
        ob_start();
        $conn = $connect_function($connstr);
        $error = ob_get_contents();
        ob_end_clean();
        if ($conn == false) {
            return $this->raiseError(DB_ERROR_CONNECT_FAILED, null,
                                     null, null, strip_tags($error));
        }
        $this->connection = $conn;
        return DB_OK;
    }

    // }}}
    // {{{ disconnect()

    /**
     * Log out and disconnect from the database.
     *
     * @return bool TRUE on success, FALSE if not connected.
     */
    function disconnect()
    {
        $ret = @pg_close($this->connection); // XXX ERRORMSG
        $this->connection = null;
        return $ret;
    }

    // }}}
    // {{{ simpleQuery()

    /**
     * Send a query to PostgreSQL and return the results as a
     * PostgreSQL resource identifier.
     *
     * @param $query the SQL query
     *
     * @return int returns a valid PostgreSQL result for successful SELECT
     * queries, DB_OK for other successful queries.  A DB error code
     * is returned on failure.
     */
    function simpleQuery($query)
    {
        $ismanip = DB::isManip($query);
        $this->last_query = $query;
        $query = $this->modifyQuery($query);
        if (!$this->autocommit && $ismanip) {
            if ($this->transaction_opcount == 0) {
                $result = @pg_exec($this->connection, "begin;");
                if (!$result) {
                    return $this->pgsqlRaiseError();
                }
            }
            $this->transaction_opcount++;
        }
        $result = @pg_exec($this->connection, $query);
        if (!$result) {
            return $this->pgsqlRaiseError();
        }
        // Determine which queries that should return data, and which
        // should return an error code only.
        if ($ismanip) {
            $this->affected = @pg_cmdtuples($result);
            return DB_OK;
        } elseif (preg_match('/^\s*(SELECT)\s/i', $query) &&
                  !preg_match('/^\s*(SELECT\s+INTO)\s/i', $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
            */
            $this->row[$result] = 0; // reset the row counter.
            $numrows = $this->numrows($result);
            if (is_object($numrows)) {
                return $numrows;
            }
            $this->num_rows[$result] = $numrows;
            $this->affected = 0;
            return $result;
        } else {
            $this->affected = 0;
            return DB_OK;
        }
    }

    // }}}
    // {{{ nextResult()

    /**
     * Move the internal pgsql result pointer to the next available result
     *
     * @param a valid fbsql result resource
     *
     * @access public
     *
     * @return true if a result is available otherwise return false
     */
    function nextResult($result)
    {
        return false;
    }

    // }}}
    // {{{ 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 DB 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)) {
            $error_regexps = array(
                '/(Table does not exist\.|Relation \'.*\' does not exist|sequence does not exist|class ".+" not found)$/' => DB_ERROR_NOSUCHTABLE,
                '/Relation \'.*\' already exists|Cannot insert a duplicate key into a unique index/'      => DB_ERROR_ALREADY_EXISTS,
                '/divide by zero$/'                     => DB_ERROR_DIVZERO,
                '/pg_atoi: error in .*: can\'t parse /' => DB_ERROR_INVALID_NUMBER,
                '/ttribute \'.*\' not found$|Relation \'.*\' does not have attribute \'.*\'/' => DB_ERROR_NOSUCHFIELD,
                '/parser: parse error at or near \"/'   => DB_ERROR_SYNTAX,
                '/referential integrity violation/'     => DB_ERROR_CONSTRAINT
            );
        }
        foreach ($error_regexps as $regexp => $code) {
            if (preg_match($regexp, $errormsg)) {
                return $code;
            }
        }
        // Fall back to DB_ERROR if there was no mapping.
        return DB_ERROR;
    }

    // }}}
    /**
     * Fetch and return a row of data (it uses fetchInto for that)
     * @param $result PostgreSQL result identifier
     * @param   $fetchmode  format of fetched row array
     * @param   $rownum     the absolute row number to fetch
     *
     * @return  array   a row of data, or false on error
     */
    function fetchRow($result, $fetchmode = DB_FETCHMODE_DEFAULT, $rownum=null)
    {
        if ($fetchmode == DB_FETCHMODE_DEFAULT) {
            $fetchmode = $this->fetchmode;
        }
        $res = $this->fetchInto ($result, $arr, $fetchmode, $rownum);
        if ($res !== DB_OK) {
            return $res;
        }
        return $arr;
    }

    // {{{ fetchInto()

    /**
     * Fetch a row and insert the data into an existing array.
     *
     * @param $result PostgreSQL result identifier
     * @param $row (reference) array where data from the row is stored
     * @param $fetchmode how the array data should be indexed
     * @param $rownum the row number to fetch
     *
     * @return int DB_OK on success, a DB error code on failure
     */
    function fetchInto($result, &$row, $fetchmode, $rownum=null)
    {
        $rownum = ($rownum !== null) ? $rownum : $this->row[$result];
        if ($rownum >= $this->num_rows[$result]) {
            return null;
        }
        if ($fetchmode & DB_FETCHMODE_ASSOC) {
            $row = @pg_fetch_array($result, $rownum, PGSQL_ASSOC);
        } else {
            $row = @pg_fetch_row($result, $rownum);
        }
        if (!$row) {
            $err = pg_errormessage($this->connection);
            if (!$err) {
                return null;
            }
            return $this->pgsqlRaiseError();
        }
        $this->row[$result] = ++$rownum;
        return DB_OK;
    }

    // }}}
    // {{{ freeResult()

    /**
     * Free the internal resources associated with $result.
     *
     * @param $result int PostgreSQL result identifier or DB statement identifier
     *
     * @return bool TRUE on success, FALSE if $result is invalid
     */
    function freeResult($result)
    {
        if (is_resource($result)) {
            return @pg_freeresult($result);
        }
        if (!isset($this->prepare_tokens[(int)$result])) {
            return false;
        }
        unset($this->prepare_tokens[(int)$result]);
        unset($this->prepare_types[(int)$result]);
        unset($this->row[(int)$result]);
        unset($this->num_rows[(int)$result]);
        $this->affected = 0;
        return true;
    }

    // }}}
    // {{{ quote()
    /**
    * Quote the given string so it can be safely used within string delimiters
    * in a query.
    * @param $string mixed Data to be quoted
    * @return mixed "NULL" string, quoted string or original data
    */
    function quote($str = null)
    {
        switch (strtolower(gettype($str))) {
            case 'null':
                return 'NULL';
            case 'integer':
            case 'double' :
                return $str;
            case 'string':
            default:
                $str = str_replace("'", "''", $str);
                //PostgreSQL treats a backslash as an escape character.
                $str = str_replace('\\', '\\\\', $str);
                return "'$str'";
        }
    }
    // }}}
    // {{{ numCols()

    /**
     * Get the number of columns in a result set.
     *
     * @param $result resource PostgreSQL result identifier
     *
     * @return int the number of columns per row in $result
     */
    function numCols($result)
    {
        $cols = @pg_numfields($result);
        if (!$cols) {
            return $this->pgsqlRaiseError();
        }
        return $cols;
    }

    // }}}
    // {{{ numRows()

    /**
     * Get the number of rows in a result set.
     *
     * @param $result resource PostgreSQL result identifier
     *
     * @return int the number of rows in $result
     */
    function numRows($result)
    {
        $rows = @pg_numrows($result);
        if ($rows === null) {
            return $this->pgsqlRaiseError();
        }
        return $rows;
    }

    // }}}
    // {{{ errorNative()

    /**