mssql.php

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

    function rollback()
    {
        if ($this->transaction_opcount > 0) {
            if (!@mssql_select_db($this->_db, $this->connection)) {
                return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);
            }
            $result = @mssql_query('ROLLBACK TRAN', $this->connection);
            $this->transaction_opcount = 0;
            if (!$result) {
                return $this->mssqlRaiseError();
            }
        }
        return DB_OK;
    }

    // }}}
    // {{{ affectedRows()

    /**
     * Determines the number of rows affected by a data maniuplation query
     *
     * 0 is returned for queries that don't manipulate data.
     *
     * @return int  the number of rows.  A DB_Error object on failure.
     */
    function affectedRows()
    {
        if (DB::isManip($this->last_query)) {
            $res = @mssql_query('select @@rowcount', $this->connection);
            if (!$res) {
                return $this->mssqlRaiseError();
            }
            $ar = @mssql_fetch_row($res);
            if (!$ar) {
                $result = 0;
            } else {
                @mssql_free_result($res);
                $result = $ar[0];
            }
        } else {
            $result = 0;
        }
        return $result;
    }

    // }}}
    // {{{ nextId()

    /**
     * Returns the next free id in a sequence
     *
     * @param string  $seq_name  name of the sequence
     * @param boolean $ondemand  when true, the seqence is automatically
     *                            created if it does not exist
     *
     * @return int  the next id number in the sequence.
     *               A DB_Error object on failure.
     *
     * @see DB_common::nextID(), DB_common::getSequenceName(),
     *      DB_mssql::createSequence(), DB_mssql::dropSequence()
     */
    function nextId($seq_name, $ondemand = true)
    {
        $seqname = $this->getSequenceName($seq_name);
        if (!@mssql_select_db($this->_db, $this->connection)) {
            return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);
        }
        $repeat = 0;
        do {
            $this->pushErrorHandling(PEAR_ERROR_RETURN);
            $result = $this->query("INSERT INTO $seqname (vapor) VALUES (0)");
            $this->popErrorHandling();
            if ($ondemand && DB::isError($result) &&
                ($result->getCode() == DB_ERROR || $result->getCode() == DB_ERROR_NOSUCHTABLE))
            {
                $repeat = 1;
                $result = $this->createSequence($seq_name);
                if (DB::isError($result)) {
                    return $this->raiseError($result);
                }
            } elseif (!DB::isError($result)) {
                $result =& $this->query("SELECT @@IDENTITY FROM $seqname");
                $repeat = 0;
            } else {
                $repeat = false;
            }
        } while ($repeat);
        if (DB::isError($result)) {
            return $this->raiseError($result);
        }
        $result = $result->fetchRow(DB_FETCHMODE_ORDERED);
        return $result[0];
    }

    /**
     * Creates a new sequence
     *
     * @param string $seq_name  name of the new sequence
     *
     * @return int  DB_OK on success.  A DB_Error object on failure.
     *
     * @see DB_common::createSequence(), DB_common::getSequenceName(),
     *      DB_mssql::nextID(), DB_mssql::dropSequence()
     */
    function createSequence($seq_name)
    {
        return $this->query('CREATE TABLE '
                            . $this->getSequenceName($seq_name)
                            . ' ([id] [int] IDENTITY (1, 1) NOT NULL,'
                            . ' [vapor] [int] NULL)');
    }

    // }}}
    // {{{ dropSequence()

    /**
     * Deletes a sequence
     *
     * @param string $seq_name  name of the sequence to be deleted
     *
     * @return int  DB_OK on success.  A DB_Error object on failure.
     *
     * @see DB_common::dropSequence(), DB_common::getSequenceName(),
     *      DB_mssql::nextID(), DB_mssql::createSequence()
     */
    function dropSequence($seq_name)
    {
        return $this->query('DROP TABLE ' . $this->getSequenceName($seq_name));
    }

    // }}}
    // {{{ quoteIdentifier()

    /**
     * Quotes a string so it can be safely used as a table or column name
     *
     * @param string $str  identifier name to be quoted
     *
     * @return string  quoted identifier string
     *
     * @see DB_common::quoteIdentifier()
     * @since Method available since Release 1.6.0
     */
    function quoteIdentifier($str)
    {
        return '[' . str_replace(']', ']]', $str) . ']';
    }

    // }}}
    // {{{ mssqlRaiseError()

    /**
     * Produces a DB_Error object regarding the current problem
     *
     * @param int $errno  if the error is being manually raised pass a
     *                     DB_ERROR* constant here.  If this isn't passed
     *                     the error information gathered from the DBMS.
     *
     * @return object  the DB_Error object
     *
     * @see DB_common::raiseError(),
     *      DB_mssql::errorNative(), DB_mssql::errorCode()
     */
    function mssqlRaiseError($code = null)
    {
        $message = @mssql_get_last_message();
        if (!$code) {
            $code = $this->errorNative();
        }
        return $this->raiseError($this->errorCode($code, $message),
                                 null, null, null, "$code - $message");
    }

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

    /**
     * Gets the DBMS' native error code produced by the last query
     *
     * @return int  the DBMS' error code
     */
    function errorNative()
    {
        $res = @mssql_query('select @@ERROR as ErrorCode', $this->connection);
        if (!$res) {
            return DB_ERROR;
        }
        $row = @mssql_fetch_row($res);
        return $row[0];
    }

    // }}}
    // {{{ errorCode()

    /**
     * Determines PEAR::DB error code from mssql's native codes.
     *
     * If <var>$nativecode</var> isn't known yet, it will be looked up.
     *
     * @param  mixed  $nativecode  mssql error code, if known
     * @return integer  an error number from a DB error constant
     * @see errorNative()
     */
    function errorCode($nativecode = null, $msg = '')
    {
        if (!$nativecode) {
            $nativecode = $this->errorNative();
        }
        if (isset($this->errorcode_map[$nativecode])) {
            if ($nativecode == 3701
                && preg_match('/Cannot drop the index/i', $msg))
            {
                return DB_ERROR_NOT_FOUND;
            }
            return $this->errorcode_map[$nativecode];
        } else {
            return DB_ERROR;
        }
    }

    // }}}
    // {{{ tableInfo()

    /**
     * Returns information about a table or a result set
     *
     * NOTE: only supports 'table' and 'flags' if <var>$result</var>
     * is a table name.
     *
     * @param object|string  $result  DB_result object from a query or a
     *                                 string containing the name of a table.
     *                                 While this also accepts a query result
     *                                 resource identifier, this behavior is
     *                                 deprecated.
     * @param int            $mode    a valid tableInfo mode
     *
     * @return array  an associative array with the information requested.
     *                 A DB_Error object on failure.
     *
     * @see DB_common::tableInfo()
     */
    function tableInfo($result, $mode = null)
    {
        if (is_string($result)) {
            /*
             * Probably received a table name.
             * Create a result resource identifier.
             */
            if (!@mssql_select_db($this->_db, $this->connection)) {
                return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);
            }
            $id = @mssql_query("SELECT * FROM $result WHERE 1=0",
                               $this->connection);
            $got_string = true;
        } elseif (isset($result->result)) {
            /*
             * Probably received a result object.
             * Extract the result resource identifier.
             */
            $id = $result->result;
            $got_string = false;
        } else {
            /*
             * Probably received a result resource identifier.
             * Copy it.
             * Deprecated.  Here for compatibility only.
             */
            $id = $result;
            $got_string = false;
        }

        if (!is_resource($id)) {
            return $this->mssqlRaiseError(DB_ERROR_NEED_MORE_DATA);
        }

        if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
            $case_func = 'strtolower';
        } else {
            $case_func = 'strval';
        }

        $count = @mssql_num_fields($id);
        $res   = array();

        if ($mode) {
            $res['num_fields'] = $count;
        }

        for ($i = 0; $i < $count; $i++) {
            $res[$i] = array(
                'table' => $got_string ? $case_func($result) : '',
                'name'  => $case_func(@mssql_field_name($id, $i)),
                'type'  => @mssql_field_type($id, $i),
                'len'   => @mssql_field_length($id, $i),
                // We only support flags for table
                'flags' => $got_string
                           ? $this->_mssql_field_flags($result,
                                                       @mssql_field_name($id, $i))
                           : '',
            );
            if ($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 ($got_string) {
            @mssql_free_result($id);
        }
        return $res;
    }

    // }}}
    // {{{ _mssql_field_flags()

    /**
     * Get a column's flags
     *
     * Supports "not_null", "primary_key",
     * "auto_increment" (mssql identity), "timestamp" (mssql timestamp),
     * "unique_key" (mssql unique index, unique check or primary_key) and
     * "multiple_key" (multikey index)
     *
     * mssql timestamp is NOT similar to the mysql timestamp so this is maybe
     * not useful at all - is the behaviour of mysql_field_flags that primary
     * keys are alway unique? is the interpretation of multiple_key correct?
     *
     * @param string $table   the table name
     * @param string $column  the field name
     *
     * @return string  the flags
     *
     * @access private
     * @author Joern Barthel <[e-mail]>
     */
    function _mssql_field_flags($table, $column)
    {
        static $tableName = null;
        static $flags = array();

        if ($table != $tableName) {

            $flags = array();
            $tableName = $table;

            // get unique and primary keys
            $res = $this->getAll("EXEC SP_HELPINDEX[$table]", DB_FETCHMODE_ASSOC);

            foreach ($res as $val) {
                $keys = explode(', ', $val['index_keys']);

                if (sizeof($keys) > 1) {
                    foreach ($keys as $key) {
                        $this->_add_flag($flags[$key], 'multiple_key');
                    }
                }

                if (strpos($val['index_description'], 'primary key')) {
                    foreach ($keys as $key) {
                        $this->_add_flag($flags[$key], 'primary_key');
                    }
                } elseif (strpos($val['index_description'], 'unique')) {
                    foreach ($keys as $key) {
                        $this->_add_flag($flags[$key], 'unique_key');
                    }
                }
            }

            // get auto_increment, not_null and timestamp
            $res = $this->getAll("EXEC SP_COLUMNS[$table]", DB_FETCHMODE_ASSOC);

            foreach ($res as $val) {
                $val = array_change_key_case($val, CASE_LOWER);
                if ($val['nullable'] == '0') {
                    $this->_add_flag($flags[$val['column_name']], 'not_null');
                }
                if (strpos($val['type_name'], 'identity')) {
                    $this->_add_flag($flags[$val['column_name']], 'auto_increment');
                }
                if (strpos($val['type_name'], 'timestamp')) {
                    $this->_add_flag($flags[$val['column_name']], 'timestamp');
                }
            }
        }

        if (array_key_exists($column, $flags)) {
            return(implode(' ', $flags[$column]));
        }
        return '';
    }

    // }}}
    // {{{ _add_flag()

    /**
     * Adds a string to the flags array if the flag is not yet in there
     * - if there is no flag present the array is created
     *
     * @param array  &$array  the reference to the flag-array
     * @param string $value   the flag value
     *
     * @return void
     *
     * @access private
     * @author Joern Barthel <[e-mail]>
     */
    function _add_flag(&$array, $value)
    {
        if (!is_array($array)) {
            $array = array($value);
        } elseif (!in_array($value, $array)) {
            array_push($array, $value);
        }
    }

    // }}}
    // {{{ getSpecialQuery()

    /**
     * Obtains the query string needed for listing a given type of objects
     *
     * @param string $type  the kind of objects you want to retrieve
     *
     * @return string  the SQL query string or null if the driver doesn't
     *                  support the object type requested
     *
     * @access protected
     * @see DB_common::getListOf()
     */
    function getSpecialQuery($type)
    {
        switch ($type) {
            case 'tables':
                return "SELECT name FROM sysobjects WHERE type = 'U'"
                       . ' ORDER BY name';
            case 'views':
                return "SELECT name FROM sysobjects WHERE type = 'V'";
            default:
                return null;
        }
    }

    // }}}
}

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 */

?>