这个问题在这里已有答案:
我将以下文档存储在mongo DB集合中,我将需要添加新订阅者例如 . 我需要添加订阅者"protocol":"SOAP"和url http://localhost.8080/FNOL/subscriber3名称为"name":"FNOL","country":"US","lob":"property"来自该文件 .
如果我们添加的网址已经存在,我们不应该添加到文档中,以防文档中不存在匹配条件名称“name”:“FNOL”,“country”:“US”,“lob”:“属性“我需要插入一个新文件 .
是否可以在mongo db中的单个命令中执行以上所有操作?
提前致谢 .
{
"_id" : ObjectId("5b07fbbc0d7a677d2f8b2d87"),
"name" : "FNOL",
"country" : "US",
"lob" : "property",
"subscribers" : [
{
"protocol" : "REST",
"url" : "http://localhost.8080/FNOL/subscriber1"
},
{
"protocol" : "SOAP",
"url" : "http://localhost.8080/FNOL/subscriber2"
},
{
"protocol" : "JMS",
"url" : "NOTIFICATION.TOPIC.FNOL"
}
]
}
更新后:
{
"_id" : ObjectId("5b07fbbc0d7a677d2f8b2d87"),
"name" : "FNOL",
"country" : "US",
"lob" : "property",
"subscribers" : [
{
"protocol" : "SOAP",
"url" : "http://localhost.8080/FNOL/subscriber2"
},
{
"protocol" : "JMS",
"url" : "NOTIFICATION.TOPIC.FNOL"
},
{
"protocol" : "SOAP",
"url" : "http://localhost.8080/FNOL/subscriber2"
}
,
{
"protocol" : "SOAP",
"url" : "http://localhost.8080/FNOL/subscriber3"
}
]
}
2 回答
您需要使用$addToSet ...如果数据已经存在,它将不会推送数据
试试这个 .
db.collection.update( { "_id": (id of the object) }, { "$push": {"subscribers": { "url": "(input url )", "protocol": "(input protocol)" } } } )