我找到了有关如何使用$push运算符向数组添加新值的信息。但是，我似乎无法使用rmongodb
假设我们在数据库中有以下文档
_id : 7 51005201f8ab44f1690f9526
tags : 4
1 : 2 a
2 : 2 b
3 : 2 c
我想为数组添加一个值tags。这是我尝试过的：
q <- mongo.bson.from.list(list(tags="a"))
试一试
在这里，我尝试使用$push运算符
代码
bnew <- mongo.bson.from.list(list("$push"=list("tags"="d")))
> mongo.update(mongo=con, ns, criteria=q, objNew=bnew)
[1] FALSE
日志文件
Thu Jan 24 16:42:27 [initandlisten] MongoDB starting : pid=6260 port=27017 dbpath=\data\db\ 64-bit host=ASHB-109C-02
Thu Jan 24 16:42:27 [initandlisten] db version v2.2.2, pdfile version 4.5
Thu Jan 24 16:42:27 [initandlisten] git version: d1b43b61a5308c4ad0679d34b262c5af9d664267
Thu Jan 24 16:42:27 [initandlisten] build info: windows sys.getwindowsversion(major=6, minor=1, build=7601, platform=2, service_pack='Service Pack 1') BOOST_LIB_VERSION=1_49
Thu Jan 24 16:42:27 [initandlisten] options: { logpath: "log_1.txt" }
Thu Jan 24 16:42:27 [initandlisten] journal dir=/data/db/journal
Thu Jan 24 16:42:27 [initandlisten] recover : no journal files present, no recovery needed
Thu Jan 24 16:42:27 [initandlisten] waiting for connections on port 27017
Thu Jan 24 16:42:27 [websvr] admin web console waiting for connections on port 28017
Thu Jan 24 16:42:36 [initandlisten] connection accepted from 127.0.0.1:52419 #1 (1 connection now open)
Thu Jan 24 16:42:44 [conn1] __test.test Assertion failure x == _nfields src\mongo\db\jsobj.cpp 1250
Thu Jan 24 16:42:44 [conn1] mongod.exe ...\src\mongo\util\stacktrace.cpp(161) mongo::printStackTrace+0x3e
Thu Jan 24 16:42:44 [conn1] mongod.exe ...\src\mongo\util\assert_util.cpp(109) mongo::verifyFailed+0xdc
Thu Jan 24 16:42:44 [conn1] mongod.exe ...\src\mongo\db\jsobj.cpp(1250) mongo::BSONIteratorSorted::BSONIteratorSorted+0xf3
Thu Jan 24 16:42:44 [conn1] mongod.exe ...\src\mongo\db\ops\update_internal.cpp(906) mongo::ModSetState::createNewFromMods+0xa3
Thu Jan 24 16:42:44 [conn1] mongod.exe ...\src\mongo\db\ops\update.cpp(370) mongo::_updateObjects+0x15a2
Thu Jan 24 16:42:44 [conn1] mongod.exe ...\src\mongo\db\instance.cpp(573) mongo::receivedUpdate+0x60d
Thu Jan 24 16:42:44 [conn1] mongod.exe ...\src\mongo\db\instance.cpp(437) mongo::assembleResponse+0x626
Thu Jan 24 16:42:44 [conn1] mongod.exe ...\src\mongo\db\db.cpp(192) mongo::MyMessageHandler::process+0xf5
Thu Jan 24 16:42:44 [conn1] mongod.exe ...\src\mongo\util\net\message_server_port.cpp(86) mongo::pms::threadRun+0x59a
Thu Jan 24 16:42:44 [conn1] mongod.exe ...\src\third_party\boost\libs\thread\src\win32\thread.cpp(180) boost::`anonymous namespace'::thread_start_function+0x21
Thu Jan 24 16:42:44 [conn1] mongod.exe f:\dd\vctools\crt_bld\self_64_amd64\crt\src\threadex.c(314) _callthreadstartex+0x17
Thu Jan 24 16:42:44 [conn1] mongod.exe f:\dd\vctools\crt_bld\self_64_amd64\crt\src\threadex.c(292) _threadstartex+0x7f
Thu Jan 24 16:42:44 [conn1] kernel32.dll BaseThreadInitThunk+0xd
Thu Jan 24 16:42:44 [conn1] update __test.test query: { tags: "a" } update: { $push: { tags: "d" } } nscanned:1 keyUpdates:0 exception: assertion src\mongo\db\jsobj.cpp:1250 locks(micros) w:398335 399ms
Thu Jan 24 16:42:48 CTRL_CLOSE_EVENT signal
Thu Jan 24 16:42:48 [consoleTerminate] got CTRL_CLOSE_EVENT, will terminate after current cmd ends
Thu Jan 24 16:42:48 [consoleTerminate] now exiting
Thu Jan 24 16:42:48 dbexit:
Thu Jan 24 16:42:48 [consoleTerminate] shutdown: going to close listening sockets...
Thu Jan 24 16:42:48 [consoleTerminate] closing listening socket: 496
Thu Jan 24 16:42:48 [consoleTerminate] closing listening socket: 516
Thu Jan 24 16:42:48 [consoleTerminate] shutdown: going to flush diaglog...
Thu Jan 24 16:42:48 [consoleTerminate] shutdown: going to close sockets...
Thu Jan 24 16:42:48 [consoleTerminate] shutdown: waiting for fs preallocator...
Thu Jan 24 16:42:48 [consoleTerminate] shutdown: lock for final commit...
Thu Jan 24 16:42:48 [consoleTerminate] shutdown: final commit...
Thu Jan 24 16:42:48 [conn1] end connection 127.0.0.1:52419 (0 connections now open)
Thu Jan 24 16:42:48 [consoleTerminate] shutdown: closing all files...
Thu Jan 24 16:42:48 [consoleTerminate] closeAllFiles() finished
Thu Jan 24 16:42:48 [consoleTerminate] journalCleanup...
Thu Jan 24 16:42:48 [consoleTerminate] removeJournalFiles
Thu Jan 24 16:42:48 [consoleTerminate] shutdown: removing fs lock...
Thu Jan 24 16:42:48 dbexit: really exiting now
尝试 2
在这里，我尝试使用$addToSet运算符
代码
buf <- mongo.bson.buffer.create()
mongo.bson.buffer.start.object(buf, "$addToSet")
mongo.bson.buffer.start.object(buf, name="tags")
mongo.bson.buffer.start.array(buf, "$each")
values <- list("d", "e", "f")
for (ii in seq(along=values)) {
mongo.bson.buffer.append(
buf=buf,
name=as.character(ii),
value=values[[ii]]
)
}
mongo.bson.buffer.finish.object(buf)
mongo.bson.buffer.finish.object(buf)
mongo.bson.buffer.finish.object(buf)
bnew <- mongo.bson.from.buffer(buf)
bnew
> mongo.update(mongo=con, ns, criteria=q, objNew=bnew)
[1] FALSE
日志文件
Thu Jan 24 16:43:52 [initandlisten] MongoDB starting : pid=4184 port=27017 dbpath=\data\db\ 64-bit host=ASHB-109C-02
Thu Jan 24 16:43:52 [initandlisten] db version v2.2.2, pdfile version 4.5
Thu Jan 24 16:43:52 [initandlisten] git version: d1b43b61a5308c4ad0679d34b262c5af9d664267
Thu Jan 24 16:43:52 [initandlisten] build info: windows sys.getwindowsversion(major=6, minor=1, build=7601, platform=2, service_pack='Service Pack 1') BOOST_LIB_VERSION=1_49
Thu Jan 24 16:43:52 [initandlisten] options: { logpath: "log_2.txt" }
Thu Jan 24 16:43:52 [initandlisten] journal dir=/data/db/journal
Thu Jan 24 16:43:52 [initandlisten] recover : no journal files present, no recovery needed
Thu Jan 24 16:43:52 [initandlisten] waiting for connections on port 27017
Thu Jan 24 16:43:52 [websvr] admin web console waiting for connections on port 28017
Thu Jan 24 16:43:57 [initandlisten] connection accepted from 127.0.0.1:52435 #1 (1 connection now open)
Thu Jan 24 16:44:27 [conn1] __test.test Assertion failure x == _nfields src\mongo\db\jsobj.cpp 1250
Thu Jan 24 16:44:28 [conn1] mongod.exe ...\src\mongo\util\stacktrace.cpp(161) mongo::printStackTrace+0x3e
Thu Jan 24 16:44:28 [conn1] mongod.exe ...\src\mongo\util\assert_util.cpp(109) mongo::verifyFailed+0xdc
Thu Jan 24 16:44:28 [conn1] mongod.exe ...\src\mongo\db\jsobj.cpp(1250) mongo::BSONIteratorSorted::BSONIteratorSorted+0xf3
Thu Jan 24 16:44:28 [conn1] mongod.exe ...\src\mongo\db\ops\update_internal.cpp(906) mongo::ModSetState::createNewFromMods+0xa3
Thu Jan 24 16:44:28 [conn1] mongod.exe ...\src\mongo\db\ops\update.cpp(370) mongo::_updateObjects+0x15a2
Thu Jan 24 16:44:28 [conn1] mongod.exe ...\src\mongo\db\instance.cpp(573) mongo::receivedUpdate+0x60d
Thu Jan 24 16:44:28 [conn1] mongod.exe ...\src\mongo\db\instance.cpp(437) mongo::assembleResponse+0x626
Thu Jan 24 16:44:28 [conn1] mongod.exe ...\src\mongo\db\db.cpp(192) mongo::MyMessageHandler::process+0xf5
Thu Jan 24 16:44:28 [conn1] mongod.exe ...\src\mongo\util\net\message_server_port.cpp(86) mongo::pms::threadRun+0x59a
Thu Jan 24 16:44:28 [conn1] mongod.exe ...\src\third_party\boost\libs\thread\src\win32\thread.cpp(180) boost::`anonymous namespace'::thread_start_function+0x21
Thu Jan 24 16:44:28 [conn1] mongod.exe f:\dd\vctools\crt_bld\self_64_amd64\crt\src\threadex.c(314) _callthreadstartex+0x17
Thu Jan 24 16:44:28 [conn1] mongod.exe f:\dd\vctools\crt_bld\self_64_amd64\crt\src\threadex.c(292) _threadstartex+0x7f
Thu Jan 24 16:44:28 [conn1] kernel32.dll BaseThreadInitThunk+0xd
Thu Jan 24 16:44:28 [conn1] update __test.test query: { tags: "a" } update: { $addToSet: { tags: { $each: [ "d", "e", "f" ] } } } nscanned:1 keyUpdates:0 exception: assertion src\mongo\db\jsobj.cpp:1250 locks(micros) w:390312 390ms
Thu Jan 24 16:44:33 [conn1] end connection 127.0.0.1:52435 (0 connections now open)
Thu Jan 24 16:44:37 CTRL_CLOSE_EVENT signal
Thu Jan 24 16:44:37 [consoleTerminate] got CTRL_CLOSE_EVENT, will terminate after current cmd ends
Thu Jan 24 16:44:37 [consoleTerminate] now exiting
Thu Jan 24 16:44:37 dbexit:
Thu Jan 24 16:44:37 [consoleTerminate] shutdown: going to close listening sockets...
Thu Jan 24 16:44:37 [consoleTerminate] closing listening socket: 496
Thu Jan 24 16:44:37 [consoleTerminate] closing listening socket: 500
Thu Jan 24 16:44:37 [consoleTerminate] shutdown: going to flush diaglog...
Thu Jan 24 16:44:37 [consoleTerminate] shutdown: going to close sockets...
Thu Jan 24 16:44:37 [consoleTerminate] shutdown: waiting for fs preallocator...
Thu Jan 24 16:44:37 [consoleTerminate] shutdown: lock for final commit...
Thu Jan 24 16:44:37 [consoleTerminate] shutdown: final commit...
Thu Jan 24 16:44:37 [consoleTerminate] shutdown: closing all files...
Thu Jan 24 16:44:37 [consoleTerminate] closeAllFiles() finished
Thu Jan 24 16:44:37 [consoleTerminate] journalCleanup...
Thu Jan 24 16:44:37 [consoleTerminate] removeJournalFiles
Thu Jan 24 16:44:37 [consoleTerminate] shutdown: removing fs lock...
Thu Jan 24 16:44:37 dbexit: really exiting now
我在这里做错了什么？
附加信息
对于那些感兴趣的人：这是生成示例文档的代码
pkg <- "rmongodb"
lib <- file.path(R.home(), "library")
if (!suppressWarnings(require(pkg, lib.loc=lib, character.only=TRUE))) {
install.packages(pkg, lib=lib)
require(pkg, lib.loc=lib, character.only=TRUE)
}
# CONNECTION
db <- "__test"
ns <- paste(db, "test", sep=".")
con <- mongo.create(db=db)
# ENSURE EMPTY DB
mongo.remove(mongo=con, ns=ns)
# INSERT
buf <- mongo.bson.buffer.create()
mongo.bson.buffer.start.array(buf, name="tags")
values <- list("a", "b", "c")
for (ii in seq(along=values)) {
mongo.bson.buffer.append(
buf=buf,
name=as.character(ii),
value=values[[ii]]
)
}
mongo.bson.buffer.finish.object(buf)
mongo.bson.buffer.finish.object(buf)
b <- mongo.bson.from.buffer(buf)
mongo.insert(mongo=con, ns=ns, b=b)
编辑 2013-01-29
正如 10gen 的Tad Marshall在他对我的错误报告的评论中所建议的那样，我重新运行了插入文档的代码，而 MongoDB 服务器在--objcheck模式下运行（验证 BSON 结构）并且瞧：服务器不会让我插入文档由于断言失败。如果我在没有--objcheck标志的情况下运行服务器，则插入成功（但这可能只是因为没有进行验证）。
请注意，我尝试了将数组放在一起的两个不同版本，tags因为我的初始代码生成了一个文档，恕我直言，它与 MongoDB 的索引约定不同步：
（可能）无效的文件
我上面就是这样做的。我注意到我没有确保数组索引以0. 插入此文档将失败（请参阅下面的日志文件）
buf <- mongo.bson.buffer.create()
mongo.bson.buffer.start.array(buf, name="tags")
values <- list("a", "b", "c")
for (ii in seq(along=values)) {
mongo.bson.buffer.append(
buf=buf,
name=as.character(ii),
value=values[[ii]]
)
}
mongo.bson.buffer.finish.object(buf) # finish array 'tags'
mongo.bson.buffer.finish.object(buf) # finish buffer
b <- mongo.bson.from.buffer(buf)
> b
tags : 4
1 : 2 a
2 : 2 b
3 : 2 c
有效文件
我确保索引以 开头0，所以这绝对应该是一个有效的 BSON 文档。但是插入这个文件也会失败（见下面的日志文件）
buf <- mongo.bson.buffer.create()
mongo.bson.buffer.start.array(buf, name="tags")
values <- list("a", "b", "c")
for (ii in seq(along=values)) {
mongo.bson.buffer.append(
buf=buf,
name=as.character(ii-1),
value=values[[ii]]
)
}
mongo.bson.buffer.finish.object(buf) # finish array 'tags'
mongo.bson.buffer.finish.object(buf) # finish buffer
b <- mongo.bson.from.buffer(buf)
b
mongo.insert(mongo=con, ns=ns, b=b)
> b
tags : 4
0 : 2 a
1 : 2 b
2 : 2 c
日志文件
Tue Jan 29 14:20:46 [initandlisten] MongoDB starting : pid=6440 port=27017
[...]
Tue Jan 29 14:20:59 [initandlisten] connection accepted from 127.0.0.1:62137 #1 (1 connection now open)
Tue Jan 29 14:21:03 [conn1] Assertion: 10307:Client Error: bad object in message
Tue Jan 29 14:21:04 [conn1] mongod.exe ...\src\mongo\util\stacktrace.cpp(161) mongo::printStackTrace+0x3e
Tue Jan 29 14:21:04 [conn1] mongod.exe ...\src\mongo\util\assert_util.cpp(154) mongo::msgasserted+0xc1
Tue Jan 29 14:21:04 [conn1] mongod.exe ...\src\mongo\db\dbmessage.h(205) mongo::DbMessage::nextJsObj+0x103
Tue Jan 29 14:21:04 [conn1] mongod.exe ...\src\mongo\db\instance.cpp(784) mongo::receivedInsert+0xdb
Tue Jan 29 14:21:04 [conn1] mongod.exe ...\src\mongo\db\instance.cpp(434) mongo::assembleResponse+0x607
Tue Jan 29 14:21:04 [conn1] mongod.exe ...\src\mongo\db\db.cpp(192) mongo::MyMessageHandler::process+0xf5
Tue Jan 29 14:21:04 [conn1] mongod.exe ...\src\mongo\util\net\message_server_port.cpp(86) mongo::pms::threadRun+0x59a
Tue Jan 29 14:21:04 [conn1] mongod.exe ...\src\third_party\boost\libs\thread\src\win32\thread.cpp(180) boost::`anonymous namespace'::thread_start_function+0x21
Tue Jan 29 14:21:04 [conn1] mongod.exe f:\dd\vctools\crt_bld\self_64_amd64\crt\src\threadex.c(314) _callthreadstartex+0x17
Tue Jan 29 14:21:04 [conn1] mongod.exe f:\dd\vctools\crt_bld\self_64_amd64\crt\src\threadex.c(292) _threadstartex+0x7f
Tue Jan 29 14:21:04 [conn1] kernel32.dll BaseThreadInitThunk+0xd
Tue Jan 29 14:21:04 [conn1] insert __test.test keyUpdates:0 exception: Client Error: bad object in message code:10307 0ms
Tue Jan 29 14:21:07 [conn1] Assertion: 10307:Client Error: bad object in message
Tue Jan 29 14:21:07 [conn1] mongod.exe ...\src\mongo\util\stacktrace.cpp(161) mongo::printStackTrace+0x3e
Tue Jan 29 14:21:07 [conn1] mongod.exe ...\src\mongo\util\assert_util.cpp(154) mongo::msgasserted+0xc1
Tue Jan 29 14:21:07 [conn1] mongod.exe ...\src\mongo\db\dbmessage.h(205) mongo::DbMessage::nextJsObj+0x103
Tue Jan 29 14:21:07 [conn1] mongod.exe ...\src\mongo\db\instance.cpp(784) mongo::receivedInsert+0xdb
Tue Jan 29 14:21:07 [conn1] mongod.exe ...\src\mongo\db\instance.cpp(434) mongo::assembleResponse+0x607
Tue Jan 29 14:21:07 [conn1] mongod.exe ...\src\mongo\db\db.cpp(192) mongo::MyMessageHandler::process+0xf5
Tue Jan 29 14:21:07 [conn1] mongod.exe ...\src\mongo\util\net\message_server_port.cpp(86) mongo::pms::threadRun+0x59a
Tue Jan 29 14:21:07 [conn1] mongod.exe ...\src\third_party\boost\libs\thread\src\win32\thread.cpp(180) boost::`anonymous namespace'::thread_start_function+0x21
Tue Jan 29 14:21:07 [conn1] mongod.exe f:\dd\vctools\crt_bld\self_64_amd64\crt\src\threadex.c(314) _callthreadstartex+0x17
Tue Jan 29 14:21:07 [conn1] mongod.exe f:\dd\vctools\crt_bld\self_64_amd64\crt\src\threadex.c(292) _threadstartex+0x7f
Tue Jan 29 14:21:07 [conn1] kernel32.dll BaseThreadInitThunk+0xd
Tue Jan 29 14:21:07 [conn1] insert __test.test keyUpdates:0 exception: Client Error: bad object in message code:10307 0ms