我有這個文件:多個更新用java
{
"_id" : ObjectId("54140782b6d2ca6018585093"),
"user_id" : ObjectId("53f4ae1ae750619418a20467"),
"date" : ISODate("2014-09-13T08:59:46.709Z"),
"type" : 0,
"tot" : 2,
"additional_info" : {
"item_id" : ObjectId("540986159ef9ebafd3dcb5d0"),
"shop_id" : ObjectId("53f4cc5a6e09f788a103d0a4"),
"ap_id" : ObjectId("53f4cc5a6e09f788a103d0a5")
},
"transactions" : [
{
"_id" : ObjectId("54140782b6d2ca6018585091"),
"date_creation" : ISODate("2014-09-13T08:59:46.711Z"),
"type" : -1
},
{
"_id" : ObjectId("54140782b6d2ca6018585092"),
"date_creation" : ISODate("2014-09-13T08:59:46.788Z"),
"type" : 1
}
]
}
,我需要2個字段添加到第一筆交易opbject: - date_execution:日期 - 結果:本BSON文檔
{ "server_used" : "xxx.xxx.xxx.xxx:27017" , "ok" : 1 , "n" : 1 , "updated_executed" : true} (m_OR.getDocument() in the following code example)
到obtaing該文件
{
"_id" : ObjectId("54140811b6d25137753c1a1a"),
"user_id" : ObjectId("53f4ae1ae750619418a20467"),
"date" : ISODate("2014-09-13T09:02:09.098Z"),
"type" : 0,
"tot" : 2,
"additional_info" : {
"item_id" : ObjectId("540986159ef9ebafd3dcb5d0"),
"shop_id" : ObjectId("53f4cc5a6e09f788a103d0a4"),
"ap_id" : ObjectId("53f4cc5a6e09f788a103d0a5")
},
"transactions" : [
{
"_id" : ObjectId("54140811b6d25137753c1a18"),
"date_creation" : ISODate("2014-09-13T09:02:09.100Z"),
"type" : -1,
"result" : {
"server_used" : "xxx.xxx.xxx.xxx:27017",
"ok" : 1,
"n" : 1,
"updated_executed" : true
},
"date_execution" : ISODate("2014-09-13T09:02:15.370Z")
},
{
"_id" : ObjectId("54140811b6d25137753c1a19"),
"date_creation" : ISODate("2014-09-13T09:02:09.179Z"),
"type" : 1
}
]
}
唯一這樣我能做到這一點是做2分離更新(更新是執行MongoDB中的實際更新一個我的包裝funciont,它工作正常):
// where
BasicDBObject query = new BasicDBObject();
query.append("transactions._id", m_Task.ID());
// new value for result - 1st upd
BasicDBObject value = new BasicDBObject();
value.put("$set",new BasicDBObject("transactions.$.date_execution",new Date()));
update(this._systemDB, "activities", query, value);
// new value for date_execution - 2nd upd
value = new BasicDBObject();
value.put("$set",new BasicDBObject("transactions.$.result",m_OR.getDocument()));
update(this._systemDB, "activities", query, value);
如果我試着這樣做:
BasicDBObject value = new BasicDBObject();
value.put("$set",new BasicDBObject("transactions.$.date_execution",new Date()));
value.put("$set",new BasicDBObject("transactions.$.result",m_OR.getDocument()));
or = update(this._systemDB, "activities", query, value);
只是第二套將被應用。
有沒有辦法避免雙重執行,並只需要一次調用即可應用更新?