更新MongoDB shell中的查询

时间:2011-10-13 15:35:20

标签: mongodb mongo-shell

在shell中,我的查询是:

db.checkin_4e95ae0926abe9ad28000001.update({location_city:"New York"}, {location_country: "FUDGE!"});

但是,它实际上并没有更新我的记录。它也没有错误。运行此操作后执行db.checkin_4e95ae0926abe9ad28000001.find({location_city:"New York"});后,我得到了所有结果,但location_country没有更改:

{
    "_id": ObjectId("4e970209a0290b70660009e9"),
    "addedOn": ISODate("2011-10-13T15:21:45.772Z"),
    "location_address1": "",
    "location_city": "New York",
    "location_country": "United States",
    "location_latLong": {
        "xLon": -74.007124,
        "yLat": 40.71455
    },
    "location_source": "socialprofile",
    "location_state": "New York",
    "location_zip": ""
}

4 个答案:

答案 0 :(得分:28)

这是因为在update函数的第二个参数中,您需要使用$set运算符来更新location_country,如下例所示:

db.checkin_4e95ae0926abe9ad28000001.update(
   {location_city:"New York"}, //find criteria
   // this row contains fix with $set oper
   { $set : { location_country: "FUDGE!"}}); 

Here您可以找到可用更新运算符列表。

答案 1 :(得分:6)

在版本3.6中更改。 以下是update的语法:

db.collection.update(
   <query>,
   <update>,
   {
     upsert: <boolean>,
     multi: <boolean>,
     writeConcern: <document>,
     collation: <document>,
     arrayFilters: [ <filterdocument1>, ... ]
   }
)

示例:

db.getCollection('products').update({},{$unset: {translate:1, qordoba_translation_version:1}}, {multi: true})

在您的示例中:

db.checkin_4e95ae0926abe9ad28000001.update(
   {location_city:"New York"}, //query
   // $update query
   { $set : { location_country: "FUDGE!"}});

默认情况下,update()方法更新单个文档。设置“多参数”以更新所有符合查询条件的文档。

示例2:

   db.checkin_4e95ae0926abe9ad28000001.update(
       {location_city:"New York"}, //query
       // $update query
       { $set : { location_country: "FUDGE!"}}, {multi: true});

答案 2 :(得分:4)

db.m_country.update(
    {"countryId": "962a0935-bf3d-4f63-a53c-254760273ede"}, 
    {$set: {'countryPopulation': '12540000'}})

答案 3 :(得分:0)

<块引用>

更新前

> db.student.find({name:"Venky"}).pretty();

{
    "_id" : ObjectId("6012e64dc2979ddffe1e5df9"),
    "name" : "Venky",
    "dept" : "MCA",
    "age" : "26",
    "phone" : "89786465"

}

<块引用>

更新命令

> db.student.update({name:"Venky"},{$set: {name:"DODDANNA CHAWAN",dept:"MCA(CS)", age:"25", phone:"1234567890"}});
<块引用>

查找命令查看结果

> db.student.find({name:"DODDANNA CHAWAN"}).pretty();
<块引用>

更新结果后

{
    "_id" : ObjectId("6012e64dc2979ddffe1e5df9"),
    "name" : "DODDANNA CHAWAN",
    "dept" : "MCA(CS)",
    "age" : "25",
    "phone" : "1234567890"

}

<块引用>

在现实生活中使用唯一的“_id”来匹配文档,因为名称会被发现为重复