pgsql.php

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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 foldmethod=marker: */
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 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]>                                   |
// | Maintainer: Daniel Convissor <[e-mail]>                       |
// +----------------------------------------------------------------------+
//
// $Id: pgsql.php,v 1.2 2005/07/22 05:10:14 max Exp $

require_once PEAR_DIR . 'DB/common.php';

/**
 * Database independent query interface definition for PHP's PostgreSQL
 * extension.
 *
 * @package  DB
 * @version  $Id: pgsql.php,v 1.2 2005/07/22 05:10:14 max Exp $
 * @category Database
 * @author   Rui Hirokawa <[e-mail]>
 * @author   Stig Bakken <[e-mail]>
 */
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;
        $protocol = $dsninfo['protocol'] ? $dsninfo['protocol'] : 'tcp';
        $connstr = '';

        if ($protocol == 'tcp') {
            if ($dsninfo['hostspec']) {
                $connstr .= 'host=' . $dsninfo['hostspec'];
            }
            if ($dsninfo['port']) {
                $connstr .= ' port=' . $dsninfo['port'];
            }
        } elseif ($protocol == 'unix') {
            // Allow for pg socket in non-standard locations.
            if ($dsninfo['socket']) {
                $connstr .= 'host=' . $dsninfo['socket'];
            }
        }

        if ($dsninfo['database']) {
            $connstr .= ' dbname=\'' . addslashes($dsninfo['database']) . '\'';
        }
        if ($dsninfo['username']) {
            $connstr .= ' user=\'' . addslashes($dsninfo['username']) . '\'';
        }
        if ($dsninfo['password']) {
            $connstr .= ' password=\'' . addslashes($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);
        $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*\(?\s*(SELECT(?!\s+INTO)|EXPLAIN|SHOW)\s/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
            */
            $this->row[(int)$result] = 0; // reset the row counter.
            $numrows = $this->numrows($result);
            if (is_object($numrows)) {
                return $numrows;
            }
            $this->num_rows[(int)$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()

    /**
     * Determine PEAR::DB error code from the database's text error message.
     *
     * @param  string  $errormsg  error message returned from the database
     * @return integer  an error number from a DB error constant
     */
    function errorCode($errormsg)
    {
        static $error_regexps;
        if (!isset($error_regexps)) {
            $error_regexps = array(
                '/(([Rr]elation|[Ss]equence|[Tt]able)( [\"\'].*[\"\'])? does not exist|[Cc]lass ".+" not found)$/' => DB_ERROR_NOSUCHTABLE,
                '/[Cc]olumn [\"\'].*[\"\'] does not exist/' => DB_ERROR_NOSUCHFIELD,
                '/[Rr]elation [\"\'].*[\"\'] already exists|[Cc]annot insert a duplicate key into (a )?unique index.*/' => DB_ERROR_ALREADY_EXISTS,
                '/(divide|division) by zero$/'          => DB_ERROR_DIVZERO,
                '/pg_atoi: error in .*: can\'t parse /' => DB_ERROR_INVALID_NUMBER,
                '/invalid input syntax for integer/'    => DB_ERROR_INVALID_NUMBER,
                '/ttribute [\"\'].*[\"\'] not found$|[Rr]elation [\"\'].*[\"\'] does not have attribute [\"\'].*[\"\']/' => DB_ERROR_NOSUCHFIELD,
                '/parser: parse error at or near \"/'   => DB_ERROR_SYNTAX,
                '/syntax error at/'                     => DB_ERROR_SYNTAX,
                '/violates not-null constraint/'        => DB_ERROR_CONSTRAINT_NOT_NULL,
                '/violates [\w ]+ constraint/'          => DB_ERROR_CONSTRAINT,
                '/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;
    }

    // }}}
    // {{{ fetchInto()

    /**
     * Fetch a row and insert the data into an existing array.
     *
     * Formating of the array and the data therein are configurable.
     * See DB_result::fetchInto() for more information.
     *
     * @param resource $result    query result identifier
     * @param array    $arr       (reference) array where data from the row
     *                            should be placed
     * @param int      $fetchmode how the resulting array should be indexed
     * @param int      $rownum    the row number to fetch
     *
     * @return mixed DB_OK on success, null when end of result set is
     *               reached or on failure
     *
     * @see DB_result::fetchInto()
     * @access private
     */
    function fetchInto($result, &$arr, $fetchmode, $rownum=null)
    {
        $rownum = ($rownum !== null) ? $rownum : $this->row[$result];
        if ($rownum >= $this->num_rows[$result]) {
            return null;
        }
        if ($fetchmode & DB_FETCHMODE_ASSOC) {
            $arr = @pg_fetch_array($result, $rownum, PGSQL_ASSOC);
            if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {
                $arr = array_change_key_case($arr, CASE_LOWER);
            }
        } else {
            $arr = @pg_fetch_row($result, $rownum);
        }
        if (!$arr) {
            $err = pg_errormessage($this->connection);
            if (!$err) {
                return null;
            }
            return $this->pgsqlRaiseError();
        }
        if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {
            $this->_rtrimArrayValues($arr);
        }
        if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {
            $this->_convertNullArrayValuesToEmpty($arr);
        }
        $this->row[$result] = ++$rownum;
        return DB_OK;
    }

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

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

    // }}}
    // {{{ quote()

    /**
     * @deprecated  Deprecated in release 1.6.0
     * @internal
     */
    function quote($str) {
        return $this->quoteSmart($str);
    }

    // }}}
    // {{{ quoteSmart()

    /**
     * Format input so it can be safely used in a query
     *
     * @param mixed $in  data to be quoted
     *
     * @return mixed Submitted variable's type = returned value:
     *               + null = the string <samp>NULL</samp>
     *               + boolean = string <samp>TRUE</samp> or <samp>FALSE</samp>
     *               + integer or double = the unquoted number
     *               + other (including strings and numeric strings) =
     *                 the data escaped according to MySQL's settings
     *                 then encapsulated between single quotes
     *
     * @internal
     */
    function quoteSmart($in)
    {
        if (is_int($in) || is_double($in)) {
            return $in;
        } elseif (is_bool($in)) {
            return $in ? 'TRUE' : 'FALSE';
        } elseif (is_null($in)) {
            return 'NULL';
        } else {
            return "'" . $this->escapeSimple($in) . "'";
        }
    }

    // }}}
    // {{{ escapeSimple()

    /**
     * Escape a string according to the current DBMS's standards
     *
     * PostgreSQL treats a backslash as an escape character, so they are
     * removed.
     *
     * Not using pg_escape_string() yet because it requires PostgreSQL
     * to be at version 7.2 or greater.
     *
     * @param string $str  the string to be escaped
     *
     * @return string  the escaped string
     *
     * @internal
     */
    function escapeSimple($str) {
        return str_replace("'", "''", str_replace('\\', '\\\\', $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()