linux下如何提取bson中的MongoDB唯一标识_id

已经通过mongoc_collection_find()和mongoc_cursor_next()拿到想要的bson_t 类型对象现在想提取该对象中包含的MongoDB唯一标识_id。
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3个回答

自己找了一个笨方法实现了。

转成json,然后用_id做key来访问对应的数据

 while (mongoc_cursor_more (cursor) && mongoc_cursor_next (cursor, &doc)) {
      str = bson_as_json (doc, NULL);
      printf ("%s\n", str);
      bson_free (str);
   }
qq_33672112
半英里外的雨 您的意思是不是对C指针str做键值对"key=value"字符串,然后解析出_id的值
接近 2 年之前 回复
qq_33672112
半英里外的雨 具体如何转为json对象,您写的str应该是一个字符指针。因为初学,请多包涵。
接近 2 年之前 回复
oyljerry
oyljerry 回复qq_33672112: 转成json对象,然后_id是key
接近 2 年之前 回复
qq_33672112
半英里外的雨 我写的代码和您给的差不多,我想要的是如何从str里提取_id信息,或者从doc提取_id信息,您说的用_id做key具体怎么做,请指教。
接近 2 年之前 回复
 bson_t query;
bson_t child;
bson_init(&query);

BSON_APPEND_INT64(&query, "id", 0);

mongoc_cursor_t m_pCursor = mongoc_collection_find(m_pCollection,
    MONGOC_QUERY_NONE,
    0,
    0,
    0,
    &query,
    NULL,  /* Fields, NULL for all. */
    NULL); /* Read Prefs, NULL for default */

bson_destroy(&query);
bson_error_t error;
if (mongoc_cursor_error(m_pCursor, &error)) {
    cout << "Query Failure: " << error.message;
    return;
}

const bson_t *doc;

while (!mongoc_cursor_error(m_pCursor, &error)
    && mongoc_cursor_more(m_pCursor))
{
    if (mongoc_cursor_next(m_pCursor, &doc))
    {
        GetRecord(doc);
    }
    else
    {
        break;
    }
}
if (mongoc_cursor_error(m_pCursor, &error)) {
    cout << "Query Failure: " << error.message;
}

mongoc_cursor_destroy(m_pCursor);
qq_33672112
半英里外的雨 回复dabocaiqq: GetRecord函数是要引用哪个头文件还是自己定义的,另外记录中包含的_id怎么提取。请指教
接近 2 年之前 回复
dabocaiqq
穷在人世中少你左右我想我连什么价值也没有 回复qq_33672112: 获取文档的记录
接近 2 年之前 回复
qq_33672112
半英里外的雨 GetRecord(doc);起到什么作用
接近 2 年之前 回复
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如何使用golang在mongodb中对具有相同user_id的收集数据进行$ group?

<div class="post-text" itemprop="text"> <p>I'm trying to make the sum of the price of the product which having same <code>user_id</code> using golang. But I don't know how I will get this. I tried <code>$group</code> in the following code</p> <p>Struct for product</p> <pre><code>type Product struct { Id int `json:"id" bson:"_id"` Name string `json:"name" bson:"name"` Sku string `json:"sku" bson:"sku"` Category string `json:"category" bson:"category"` Stock int `json:"stock" bson:"stock"` Price float64 `json:"price" bson:"price"` Sale_price float64 `json:"sale_price" bson:"sale_price"` UpdatedOn int64 `json:"updated_on" bson:"updated_on"` UserId int `json:"user_id" bson:"user_id"` } </code></pre> <p>Struct for the customer</p> <pre><code>type Customer struct { Id int `json:"id" bson:"_id"` FirstName string `json:"first_name" bson:"first_name"` LastName string `json:"last_name" bson:"last_name"` Email string `json:"email" bson:"email"` PhoneNumber string `json:"phone_number" bson:"phone_number"` } </code></pre> <p>function from where the data will retrieve </p> <pre><code>func GetProducts(c *gin.Context) { mongoSession := config.ConnectDb() //connection to database collection := mongoSession.DB(config.Database).C(config.ProductCollection) //session pipeline := []bson.M{ bson.M{"$group": bson.M{"user_id": 1}}, bson.M{"$sum": bson.M{"price": "price"}}, } //query i tried fmt.Println(pipeline) pipe := collection.Pipe(pipeline) resp := []bson.M{} err = pipe.All(&amp;resp) if err != nil { fmt.Println("Errored: %#v ", err) } fmt.Println(resp) GetResponseList(c, response) } </code></pre> <p>The data viewed in the image-</p> <p><a href="https://i.stack.imgur.com/hMVuP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hMVuP.png" alt=""></a></p> <p>In the above image the <code>user_id</code> of the product is same. I want to group this data and calculate the <code>price</code>.</p> <p>I also read the documentation of the Mongodb <a href="https://docs.mongodb.com/manual/reference/operator/aggregation/sum/" rel="nofollow noreferrer">this one</a> but don't understand how to do in golang can anyone explain it in simple way how to make the query for this. Thanks</p> </div>

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<div class="post-text" itemprop="text"> <p>I'm working with <a href="https://github.com/mongodb/mongo-go-driver" rel="nofollow noreferrer">https://github.com/mongodb/mongo-go-driver</a> and currently trying to implement a partial update of such struct</p> <pre><code>type NoteUpdate struct { ID string `json:"id,omitempty" bson:"_id,omitempty"` Title string `json:"title" bson:"title,omitempty"` Content string `json:"content" bson:"content,omitempty"` ChangedAt int64 `json:"changed_at" bson:"changed_at"` } </code></pre> <p>For instance, if I have</p> <pre><code>noteUpdate := NoteUpdate{ Title: "New Title" } </code></pre> <p>Then I expect that the only "title" field in the stored document will be changed.</p> <p>I need to write something like</p> <pre><code>collection.FindOneAndUpdate(context.Background(), bson.NewDocument(bson.EC.String("_id", noteUpdate.ID)), // I need to encode non-empty fields here bson.NewDocument(bson.EC.SubDocument("$set", bson.NewDocument(...))) ) </code></pre> <p>The problem is that I don't want to manually encode each non-empty field with <code>bson.EC.String(...)</code> or <code>bson.EC.Int64(...)</code>. I tried to use <code>bson.EC.InterfaceErr(...)</code> but got an error </p> <blockquote> <p>Cannot create element for type *models.NoteUpdate, try using bsoncodec.ConstructElementErr</p> </blockquote> <p>Unfortunately, there is no such function in bsoncodec. The only way I found is to create wrapper </p> <pre><code>type SetWrapper struct { Set interface{} `bson:"$set,omitempty"` } </code></pre> <p>And use it like</p> <pre><code>partialUpdate := &amp;NoteUpdate{ ID: "some-note-id", Title: "Some new title", } updateParam := SetWrapper{Set: partialUpdate} collection.FindOneAndUpdate( context.Background(), bson.NewDocument(bson.EC.String("_id", noteUpdate.ID)), updateParam, ) </code></pre> <p>It works, but is it possible to achieve the same with bson/bsoncodec document builders ?</p> <p>UPD. The full context of my question: I wrote the REST endpoint for <strong>partially</strong> updating "Note" documents(stored in MongoDB). Code that I have now:</p> <pre><code>var noteUpdate models.NoteUpdate ctx.BindJSON(&amp;noteUpdate) //omit validation and errors handling updateParams := services.SetWrapper{Set: noteUpdate} res := collection.FindOneAndUpdate( context.Background(), bson.NewDocument(bson.EC.String("_id", noteUpdate.ID)), updateParams, findopt.OptReturnDocument(option.After), ) </code></pre> <p>Code that I want to have</p> <pre><code>var noteUpdate models.NoteUpdate ctx.BindJSON(&amp;noteUpdate) //omit validation and errors handling res := collection.FindOneAndUpdate( context.Background(), bson.NewDocument(bson.EC.String("_id", noteUpdate.ID)), bson.NewDocument( //bsoncodec.ConstructElement doesn't exists bsoncodec.ConstructElement("$set", &amp;noteUpdate)), ), findopt.OptReturnDocument(option.After), ) </code></pre> <p>Code that I <strong>don't</strong> want to have</p> <pre><code>var noteUpdate models.NoteUpdate ctx.BindJSON(&amp;noteUpdate) //omit validation and errors handling bsonNote := bson.NewDocument() if noteUpdate.Title != "" { bsonNote.Append(bson.EC.String("title", noteUpdate.Title)) } if noteUpdate.Content != "" { bsonNote.Append(bson.EC.String("content", noteUpdate.Content)) } //..setting the rest of the fields... res := collection.FindOneAndUpdate( context.Background(), bson.NewDocument(bson.EC.String("_id", noteUpdate.ID)), bson.NewDocument(bson.EC.SubDocument("$set", bsonNote)), findopt.OptReturnDocument(option.After), ) </code></pre> <p>So, the precise question is - is there any way to build *bson.Document dynamically based on <code>bson</code> tags(without predefined wrappers like my SetWrapper)? </p> </div>

将MongoDB查询发送到其他系统:转换为JSON,然后解码为BSON? 用Go语言怎么做?

<div class="post-text" itemprop="text"> <p>I need to transfer a MongoDB query to a different system. For this reason I would like to use the <a href="http://docs.mongodb.org/manual/reference/mongodb-extended-json/" rel="nofollow">MongoDB Extended JSON</a>. I need this to be done mostly because I use date comparisons in my queries.</p> <p>So, the kernel of the problem is that I need to transfer a MongoDB query that has been generated in a <em>node.js</em> back-end to another back-end written in <em>Go</em> language.</p> <p>Intuitively, the most obvious format for sending this query via <em>REST</em>, is JSON. But, MongoDB queries are not exactly JSON, but BSON, which contains special constructs for dates.</p> <p>So, the idea is to convert the queries into JSON using <a href="http://docs.mongodb.org/manual/reference/mongodb-extended-json/" rel="nofollow">MongoDB Extended JSON</a> as form of representation of the special constructs. After some tests it's clear that these queries do not work. Both the MongoDB shell and queries sent via <em>node.js</em>'s need the special <code>ISODate</code> or <code>new Date</code> constructs.</p> <p>Finally, the actual question: are there functions to encode/decode from JSON to BSON, taking into account <a href="http://docs.mongodb.org/manual/reference/mongodb-extended-json/" rel="nofollow">MongoDB Extended JSON</a>, both in JavaScript (node.js) and <em>Go</em> language?</p> <h1>Updates</h1> <h2>Node.js encoding package</h2> <p>Apparently <a href="https://www.npmjs.org/package/mongodb-extended-json" rel="nofollow">there is a <em>node.js</em> package</a> that parses and stringifies BSON/JSON. So, half of my problem is resolved. I wonder if there is something like this in <em>Go</em> language. </p> <h2>Sample query</h2> <p>For example, the following query is in normal BSON:</p> <pre><code>{ Tmin: { $gt: ISODate("2006-01-01T23:00:00.000Z") } } </code></pre> <p>Translated into <em>MongoDB Extended JSON</em>, it becomes:</p> <pre><code>{ "Tmin": { "$gt" : { "$date" : 1136156400000 }}} </code></pre> </div>

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如何结合bson.M过滤器

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