Question

我的项目中有一个真实案例：

> db.foo.insert({a:'1',
... province: [{id:'1',name:'Yogyakarta',state:[{id:'1',name:'bantul'}]}]
... })

然后我找到（）......

> db.foo.find();
> { "_id" : ObjectId("5279ef4c6cfd9d5c0e19bbe0"),
    "a" : "1",
    "province" : [ 
    {"id" : "1",
         "name" : "Yogyakarta",
         "state" : [
                     {"id" : "1","name" : "bantul" }
                   ]
           }
         ] 
        }

如何删除和更新id ='1'

的状态

Answer 1

删除

要删除符合删除条件的文档，请使用remove()参数调用<query>方法。

db.foo.remove({'province.state.id': '1'})

示例

首先，插入数据Yogyakarta - Bantul

db.foo.insert({a:'1', province: [{id:'1',name:'Yogyakarta',state:[{id:'1',name:'bantul'}]}] })

插入数据Jakarta - Jakarta Selatan

db.foo.insert({a:'1', province: [{id:'2',name:'Jakarta',state:[{id:'2',name:'Jakarta Selatan'}]}] })

现在，您有两个文件

db.foo.find();

结果

[ { "a" : "1", "_id" : { "$oid" : "527b54c6cc937439340367f9" }, "province" : [ { "name" : "Yogyakarta", "id" : "1", "state" : [ { "name" : "bantul", "id" : "1" } ] } ] }, { "a" : "1", "_id" : { "$oid" : "527b54d3cc937439340367fa" }, "province" : [ { "name" : "Jakarta", "id" : "2", "state" : [ { "name" : "Jakarta Selatan", "id" : "2" } ] } ] } ]

现在，删除子文档province包含值为state的字段1的文档。

db.foo.remove({'province.state.id': '1'})

检查

db.foo.find();

现在，你有一个文件

[ { "a" : "1", "_id" : { "$oid" : "527b54d3cc937439340367fa" }, "province" : [ { "name" : "Jakarta", "id" : "2", "state" : [ { "name" : "Jakarta Selatan", "id" : "2" } ] } ] } ]

<强>更新

默认情况下，update()方法会更新单个文档。如果multi选项设置为true，则该方法将更新与查询条件匹配的所有文档。

db.foo.update({'province.state.id': '2'}, { $set: {'a': '2'} })

检查

db.foo.find();

结果

[ { "a" : "2", "_id" : { "$oid" : "527b54d3cc937439340367fa" }, "province" : [ { "name" : "Jakarta", "id" : "2", "state" : [ { "name" : "Jakarta Selatan", "id" : "2" } ] } ] } ]

在MongoDb中询问更新并删除多个数组

1 个答案: