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HomeDatabaseMysql TutorialMongoDB的增删改查

本文是对mongodb学习的一点笔记,主要介绍最简单的增删改操作,初学,看着API,有什么错误,希望大家指正:(使用官方驱动) 1.增 增加操作是最简单的,构造bsonDcument插入即可: 方式1,直接构造: MongoServer dbserver = new MongoClient(connectionStr)

本文是对mongodb学习的一点笔记,主要介绍最简单的增删改操作,初学,看着API,有什么错误,希望大家指正:(使用官方驱动)

1.增

增加操作是最简单的,构造bsonDcument插入即可:

方式1,直接构造:

MongoServer dbserver = new MongoClient(connectionStr).GetServer();
            MongoDatabase db = dbserver.GetDatabase(dbName);
            MongoCollection collection = db.GetCollection(collectionName);
            dbserver.Connect();
            BsonDocument doc = new BsonDocument();
            doc["Age"] = Int32.Parse(txt_Age.Text);
            doc["Name"] = txt_Name.Text;
            doc["Num"] = txt_Num.Text;
            doc["Introduction"] = txt_Introduction.Text;
            collection.Insert(doc);

方式2,通过实体构造:

1  var student = new Student
2  {
3       Age = Int32.Parse(txt_Age.Text),
4       Name = txt_Name.Text,
5       Num = txt_Num.Text,
6       Introduction = txt_Introduction.Text
7   };
8             
9  collection.Insert(student);

2.删

关键就是构造删除条件,通过api查到Remove方法的签名:public virtual WriteConcernResult Remove(IMongoQuery query);在网上看到好多写法都是在Remove中传入BsonDocument对象,但是我查源码发现bsonDocument根本没有实现IMongoQuery接口,实现这个接口的是一个叫做QueryDocument的类,同时QueryDocument也继承了BsonDocument对象,而构造BsonDocument和QueryDocument的方式超级多,各种方便,简单写几种:

比如构造如下条件,delete from table where?Age>15 &Age

相应的mongodb条件写法:{Age:{$gt:15,$lt:20}},下面就来构造这个条件;

方式1,直接通过bsonDocument构造:

BsonDocument doc = new BsonDocument
{
    { "Age",new BsonDocument{{"$gte",10},{"$lte",15}}}
};

方式2,直接通过QueryDocument构造:与1类似

1  QueryDocument query = new QueryDocument
2  {
3      { "Age",new QueryDocument{{"$gte",10},{"$lte",15}}}
4  };

方式3,直接通过反序列化json字符串:

1  string json = "{ Age:{$gte:10,$lte:15}}";
2  var queryJson = BsonSerializer.Deserialize(json, typeof(BsonDocument)) as BsonDocument;

个人觉得这种方式挺好,如果你mongodb命令熟悉,这种方式挺适合构造复杂条件的

方式4:通过Query类,Query是静态类,封装了各种逻辑条件方法,有泛型和泛型两种方式:

1  var query1 = Query.GT("Age", 10);//大于10;greater than 10
2  var query2 = Query.LT("Age", 15);//小于15;less than 15
3  var query = Query.And(query1, query2);

但是更好的要数泛型方式了:

var query1 = Query.GTE(t => t.Age, 10);
 var query2 = Query.LTE(t => t.Age, 15);
 //var query = Query.And(Query.GTE("Age", 10), Query.LTE("Age", 15));
 var query = Query.And(query1, query2);

最后执行Remove方法即可;

3.查

数据显示是必不可少的,查询操作中的条件过滤在删除中已说过,不再赘述,这里先写两种方式(ps:现在了解太浅,只能以笔记形式记录下)

方式1:通过FindAllAs方式或者FindAs方法

1  var query1 = Query.GTE(t => t.Age, 10);
2  var query2 = Query.LTE(t => t.Age, 15);
3  var query = Query.And(query1, query2);
4           
5  var list = collection.FindAs(typeof(Student), query);

方式2:通过linq

1   var qList = (from c in collection.AsQueryable()
2                      where c.Age > 10 && c.Age 

    <p class="copyright">
        原文地址:MongoDB的增删改查, 感谢原作者分享。
    </p>
    
    


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