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80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
// dbclient.h - connect to a Mongo database as a client, from C++
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "../grid/message.h"
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class JSObj;
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#pragma pack(push)
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#pragma pack(1)
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struct QueryResult : public MsgData {
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long long cursorId;
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int startingFrom;
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int nReturned;
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const char *data() { return (char *) (((int *)&nReturned)+1); }
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};
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#pragma pack(pop)
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class DBClientCursor : boost::noncopyable {
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friend class DBClientConnection;
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MessagingPort& p;
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long long cursorId;
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int nReturned;
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int pos;
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const char *data;
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auto_ptr<Message> m;
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string ns;
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int nToReturn;
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void dataReceived();
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void requestMore();
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public:
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DBClientCursor(MessagingPort& _p, auto_ptr<Message> _m) :
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p(_p), m(_m) { dataReceived(); }
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bool more(); // if true, safe to call next()
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JSObj next(); // returns next object in the result cursor
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};
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class DBClientConnection : boost::noncopyable {
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MessagingPort p;
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auto_ptr<SockAddr> server;
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public:
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DBClientConnection() { }
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bool connect(const char *serverHostname, string& errmsg);
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/* send a query to the database.
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ns: namespace to query, format is <dbname>.<collectname>[.<collectname>]*
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query: query to perform on the collection. this is a JSObj (binary JSON)
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You may format as
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{ query: { ... }, order: { ... } }
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to specify a sort order.
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nToReturn: n to return. 0 = unlimited
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nToSkip: start with the nth item
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fieldsToReturn:
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optional template of which fields to select. if unspecified, returns all fields
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returns: cursor.
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returns 0 if error
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*/
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auto_ptr<DBClientCursor> query(const char *ns, JSObj query, int nToReturn = 0, int nToSkip = 0, JSObj *fieldsToReturn = 0);
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JSObj findOne(const char *ns, JSObj query, JSObj *fieldsToReturn = 0);
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};
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