如何构造 basicdbobject 查询以删除深度数组文档？

Posted 2023-04-15

【中文标题】如何构造 basicdbobject 查询以删除深度数组文档？

【英文标题】：How to construct basicdbobject query to delete deep array documnet?

【发布时间】：2012-10-08 12:38:38

【问题描述】：

我有如下的 mongo 文档

  "_id" : ObjectId("5072b33aa4e8dd3e359b8e94"), 
  "menus" :  
    "5072b8dda4e8dd3e359b8ea8" :
      
        "_id" : ObjectId("5072b8dda4e8dd3e359b8ea8"), 
        "description" : "hfghfgh",
         "MenuItems" : 
            [   
                   
                "name" : "dfgdfg",  
                "description" : "dgdfgd", 
                "_id" : ObjectId("5072b91ba4e8dd3e359b8eaa")
                 ,     
                 
                "name" : "fgdfgdf",     
                "description" : "gdfgg",
                 "_id" : ObjectId("5072bb92a4e8204e51de1084") 
                
            ]
    

实际上我曾尝试删除 menuItems

中的以下对象

     
    "name" : "fgdfgdf",     
    "description" : "gdfgg",
    "_id" : ObjectId("5072bb92a4e8204e51de1084") 
    

我的查询如下，但它不起作用。

 BasicDBObject query=new BasicDBObject("_id",objectId("...");

  BasicDBObject document = new     BasicDBObject("menus.5072b8dda4e8dd3e359b8ea8.menuItems.$._id", ObjectId("5072bb92a4e8204e51de1084") );
  BasicDBObject updateOps=new BasicDBObject("$pull", document);

我有 menuItems 的 id "_id" : ObjectId("5072bb92a4e8204e51de1084") ，菜单的 id "_id" : ObjectId("5072b8dda4e8dd3e359b8ea8") 和***文档的 id "_id" : ObjectId("5072b33aa4e8dd3e359b8e "),

【问题讨论】：

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【参考方案1】：

 BasicDBObject query=new BasicDBObject("_id",new ObjectId(".....");

BasicDBObject document = new BasicDBObject("menus.5072b8dda4e8dd3e359b8ea8.menuItems",
new  BasicDBObject("_id":ObjectId("5072bb92a4e8204e51de1084") );

BasicDBObject updateOps=new BasicDBObject("$pull", document);

 db.collection.update(query,updateOps);