当我使用nodejs操作mongodb时,读取数据和更新数据都是正常的,就是在插入数据时,报错了,提示:
{ MongoError: Cannot read property 'maxBsonObjectSize' of null
at Function.MongoError.create (C:\Users\Administrator\AppData\Roaming\npm\node_modules\mongodb\node_modules\mongodb-core\lib\error.js:31:11)
at toError (C:\Users\Administrator\AppData\Roaming\npm\node_modules\mongodb\lib\utils.js:114:22)
at C:\Users\Administrator\AppData\Roaming\npm\node_modules\mongodb\lib\collection.js:656:23
at handleCallback (C:\Users\Administrator\AppData\Roaming\npm\node_modules\mongodb\lib\utils.js:96:12)
at resultHandler (C:\Users\Administrator\AppData\Roaming\npm\node_modules\mongodb\lib\bulk\ordered.js:429:14)
at C:\Users\Administrator\AppData\Roaming\npm\node_modules\mongodb\node_modules\mongodb-core\lib\wireprotocol\2_4_support.js:473:9
at _combinedTickCallback (internal/process/next_tick.js:67:7)
at process._tickCallback (internal/process/next_tick.js:98:9)
name: 'MongoError',
message: 'Cannot read property 'maxBsonObjectSize' of null',
driver: true,
code: 14,
index: 0,
errmsg: 'Cannot read property 'maxBsonObjectSize' of null',
getOperation: [Function],
toJSON: [Function],
toString: [Function] }
有哪位朋友遇到过这个问题吗?
PHP中文网2017-04-17 14:52:47
这里的maxBsonObjectSize是不是数据库文档里的一个字段?如果是的话,就算你不想在maxBsonObjectSize插入值,在插入数据时也要给它一个空值,例如空字符串'',空数组[]等。
大家讲道理2017-04-17 14:52:47
看看是不是在插入回调之前把关闭数据库链接关闭了。
MongoClient.connect(uri, function (err, db) {
if (err) {
throw err;
} else {
console.log("successfully connected to the database");
// Insert document in MongoDb Collection
var document = {title:'test',category:'node.js'}
db.collection('tut').insert(document, function(err,records){
//if (err) throw err;
console.log('inserted record id: ' + records[0]._id);
});
}
// @Warning: 这里会出错!
db.close();
});
db.close();
应该放在插入的回调里。像这样:
MongoClient.connect(uri, function (err, db) {
if (err) {
throw err;
} else {
console.log("successfully connected to the database");
// Insert document in MongoDb Collection
var document = {title:'test',category:'node.js'}
db.collection('tut').insert(document, function(err,records){
//if (err) throw err;
console.log('inserted record id: ' + records[0]._id);
// ###像这样,放在会调里关闭连接
db.close();
});
}
});