如何刪除MongoDB中

數組的數組這是我的文檔結構：如何刪除MongoDB中

{ 
"_id" : ObjectId("5841eba5d3693034c49da7d7"), 
"Key" : "01041655", 
"matchingKey" : "01041655", 
"brand" : "Brand", 
"name" : "Product Name", 
"availabilities" : [ 
    { 
     "data1" : [ 
      { 
       "number_a" : null, 
       "number_b" : "4.5", 
       "number_c" : null, 
       "number_d" : null, 
       "amount" : 0, 
       "lastCheck" : "2016-12-02T22:46:13.393+01:00" 
      }, 
      { 
       "number_a" : null, 
       "number_b" : "5", 
       "number_c" : null, 
       "number_d" : null, 
       "amount" : 0, 
       "lastCheck" : "2016-12-02T22:46:13.393+01:00" 
      }, 
      { 
       "number_a" : null, 
       "number_b" : "5.5", 
       "number_c" : null, 
       "number_d" : null, 
       "amount" : 0, 
       "lastCheck" : "2016-12-02T22:46:13.393+01:00" 
      } 
     ] 
    }, 
    { 
     "data2" : [ 
      { 
       "number_a" : null, 
       "number_b" : "4.5", 
       "number_c" : null, 
       "number_d" : null, 
       "amount" : 0, 
       "lastCheck" : "2016-12-02T22:46:13.393+01:00" 
      }, 
      { 
       "number_a" : null, 
       "number_b" : "5", 
       "number_c" : null, 
       "number_d" : null, 
       "amount" : 0, 
       "lastCheck" : "2016-12-02T22:46:13.393+01:00" 
      } 
     ] 
    } 
] 
}

林不知道，如果它要那樣做的最好辦法，所以請讓我知道，如果有一個更好的方法來做到這一點。我的問題是：如何刪除數組data1或data2。在Java中做什麼是最好的方法。我目前的Java代碼如下所示：

Document array = new Document("availabilities", dataKey); 
Document updateSet = new Document("$unset", array); 
prodCollection.updateMany(eq("matchingKey", matchingKey), updateSet);

但是，此代碼會刪除可用性中的所有文檔。

UPDATE1： 我改變了文檔結構類似：

{ 
"_id" : ObjectId("5841eba5d3693034c49da7d7"), 
"Key" : "01041655", 
"matchingKey" : "01041655", 
"brand" : "Brand", 
"name" : "Product Name", 
"availabilities" : { 
     "data1" : [ 
      { 
       "number_a" : null, 
       "number_b" : "4.5", 
       "number_c" : null, 
       "number_d" : null, 
       "amount" : 0, 
       "lastCheck" : "2016-12-02T22:46:13.393+01:00" 
      }, 
      { 
       "number_a" : null, 
       "number_b" : "5", 
       "number_c" : null, 
       "number_d" : null, 
       "amount" : 0, 
       "lastCheck" : "2016-12-02T22:46:13.393+01:00" 
      }, 
      { 
       "number_a" : null, 
       "number_b" : "5.5", 
       "number_c" : null, 
       "number_d" : null, 
       "amount" : 0, 
       "lastCheck" : "2016-12-02T22:46:13.393+01:00" 
      } 
     ],   
     "data2" : [ 
      { 
       "number_a" : null, 
       "number_b" : "4.5", 
       "number_c" : null, 
       "number_d" : null, 
       "amount" : 0, 
       "lastCheck" : "2016-12-02T22:46:13.393+01:00" 
      }, 
      { 
       "number_a" : null, 
       "number_b" : "5", 
       "number_c" : null, 
       "number_d" : null, 
       "amount" : 0, 
       "lastCheck" : "2016-12-02T22:46:13.393+01:00" 
      } 
     ] 
    } 
}

現在我可以在這樣的MongoDB特定陣列刪除：

db.products.update({"matchingKey":'01041655'},{$unset: {"availabilities.data1":1}});

我如何能做到這一點在Java中？我試過這樣：

Document array = new Document("availabilities.data1", 1); 
Document updateSet = new Document("$unset", array); 
prodCollection.updateOne(eq("matchingKey", matchingKey), updateSet);

但它仍然刪除所有數組。

來源

2016-12-02 jimb0p

刪除可用性數組內部值的標準是什麼？ – Veeram

名稱data1和data2。我必須將它們設置爲名稱嗎？ – jimb0p

我對$ set操作符有誤解。它用新的數據替換舊數據。由於這個我不需要刪除數組。我只需要使用像Java那樣的$集合：

Document availDoc = new Document("availabilities."+key, availabilities); 
Document updateSet = new Document("$set", availDoc); 
prodCollection.updateOne(eq("matchingKey", matchingKey), updateSet);

來源

2016-12-03 16:35:44 jimb0p

如何刪除MongoDB中

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