Mongodb 如何一次获取多个字段？
我一直在输入这个查询Mongodb 如何一次获取多个字段？,mongodb,mongodb-query,Mongodb,Mongodb Query,我一直在输入这个查询 db.sInsert.find( {post_id:"28011986676_10155780942281677"}, {comments_data: 1, _id:0} ) 我从MongoDB得到了这个结果 { "comments_data": { "id": "28011986676677", "comments": { "paging": { "cursors": { "after"
db.sInsert.find(
{post_id:"28011986676_10155780942281677"},
{comments_data: 1, _id:0}
)
{
"comments_data": {
"id": "28011986676677",
"comments": {
"paging": {
"cursors": {
"after": "WTI5dGJXVnVkRjlqZAFhKePQT09",
"before": "WTI5dGJXVnVkRjlqZAFhKEWXlPQT09"
}
},
"data": [
{
"created_time": "2018-01-03T21:23:47+0000",
"message": "Poor customer care service after became the customer.I did my re contract they send acknowledgement email confirmation after no followup.I called again and remains no proper response and action extremely worst customer care service.",
"from": {
"name": "Sun",
"id": "102023391"
},
"id": "10155784116677"
}
]
}
}
}
comments\u datapost\u id消息post\u id{
"_id" : ObjectId("5a43aa19d4b45e362428e2da"),
"comments_data" : {
"id" : "28011986676_10155780942281677",
"comments" : {
"paging" : {
"cursors" : {
"after" : "WTI5dGJXVnVkRjlqZAFhKemIzSTZAN4TlRBeE5EWXlPQT09",
"before" : "WTI5dGJXVnVk4TVRZAMk56YzZANVFV4TlRBeE5EWXlPQT09"
}
},
"data" : [
{
"created_time" : "2018-01-03T21:23:47+0000",
"message" : "Poor customer care service after became the Singtel customer.I did my re contract they send acknowledgement email confirmation after no followup.I called again and remains no proper response and action extremely worst customer care service.",
"from" : {
"name" : "Sundararaju G",
"id" : "1020391"
},
"id" : "10155780942281677_10155811924116677"
}
]
}
},
"post_id" : "28011986676_10155780942281677",
"post_message" : "\"Singtel TV celebrated our 10th birthday with 10 awesome experiences for our customers! Each of our winners won a trip of a lifetime - from attending the Emmy Awards, getting a magical princess treatment at Disneyland, to catching a Premier League game live in London! We thank all our customers for your support and we look forward to more great years to come!\"",
"reactions_data" : {
"reactions" : {
"paging" : {
"cursors" : {
"after" : "TVRBd01EQXpNVEF5T1Rje4TXc9PQZDZD",
"before" : "TVRjNE56TTBBek56a3hNek14TWc9PQZDZD"
},
"next" : "https://graph.facebook.com/v2.7/280119866761677/reactions?access_token=EAA"
},
"data" : [
{
"type" : "ANGRY",
"id" : "1020573391",
"name" : "Sundararaju Gh"
},
{
"type" : "LIKE",
"id" : "64721496",
"name" : "Zhiang Xian"
}
]
},
"id" : "28011986676_102281677"
}
}
{ "_id" : ObjectId("5a43aa19d4b45e362428e2ee"), "comments_data" : { "id" : "28011986676_10155778255601677",
"comments" : { "paging" : { "cursors" : { "after" : "WTI5dGJXV5zZANVFV4TXpjM09UTTVNUT09" } },
"data" : [ { "created_time" : "2017-12-20T14:16:31+0000", "message" : "Putri Thang Michael Herman hahaha maret jg", "from" : { "name" : "Caterine Liang", "id" : "10153088743299160" }, "id" : "10155778255601677_101171677" }, { "created_time" : "2017-12-20T16:38:12+0000", "message" : "Pauline Chan", "from" : { "name" : "Nitin Aggarwal", "id" : "10153185412203152" }, "id" : "10155778255601677_10155779456916677" } ] } },
"post_id" : "28011986676_10155778255601677",
"post_message" : "\"Peppa Pig and friends return to Singapore in a new musical LIVE show that\\u2019s bigger than ever with life-sized mascots. Singtel mobile subscribers enjoy exclusive priority sale and 15% off tickets to PEPPA & FRIENDS LIVE on Stage from 20 Dec \\u201817. Get your tickets at now. T&Cs apply.\"",
"reactions_data" : { "reactions" : { "paging" : { "cursors" : { "after" : "TVRBd01EQXpNREkwTVRc9PQZDZD", "before" : "TVRBd0c9PQZDZD" }, "next" : "https://graph.facebook.com/v2.7/28011986676_1601677/reactions?access_token=EAA" }, "data" : [ { "type" : "LIKE", "id" : "1263712690368750", "name" : "Alice Lo" }, { "type" : "LIKE", "id" : "130228537768890", "name" : "Gina Sangoy" }, { "type" : "LIKE", "id" : "478172222283410", "name" : "Jiamin Feng" }, { "type" : "LIKE", "id" : "10152186445293439", "name" : "Ann Wong" }, { "type" : "LIKE", "id" : "164905927597888", "name" : "ស្រីនាថ ពោធិ៍សាត់" }, { "type" : "LIKE", "id" : "694456787260426", "name" : "Lim Kian Heng" }, { "type" : "LIKE", "id" : "135201790538289", "name" : "Anasta Clara" }, { "type" : "LIKE", "id" : "10154040401150853", "name" : "Jacqueline Salim JingYuan" }, { "type" : "LIKE", "id" : "1428497527466013", "name" : "Izhan Sawalha" }, { "type" : "LIKE", "id" : "10152590923001843", "name" : "Ellena Liu" }, { "type" : "LIKE", "id" : "28011986676_1077" } }
db.sInsert.find(
{post_id:"28011986676_10155780942281677"},
{'comments_data.comments.data.message': 1, _id:0}
)
db.sInsert.aggregate([
{ $match: {post_id: {"$eq": "28011986676_10155780942281677" } } },
{ $project: {'message': '$comments_data.comments.data.message', _id:0} },
])
{
"comments_data" : {
"comments" : {
"data" : [
{
"message" : "Poor customer care service after became the customer.I did my re contract they send acknowledgement email confirmation after no followup.I called again and remains no proper response and action extremely worst customer care service."
}
]
}
}
}
comments\u data.comments.data.messagefind（）db.sInsert.find(
{post_id:"28011986676_10155780942281677"},
{'comments_data.comments.data.message': 1, _id:0}
)
db.sInsert.aggregate([
{ $match: {post_id: {"$eq": "28011986676_10155780942281677" } } },
{ $project: {'message': '$comments_data.comments.data.message', _id:0} },
])
{
"message" : [
"Poor customer care service after became the customer.I did my re contract they send acknowledgement email confirmation after no followup.I called again and remains no proper response and action extremely worst customer care service."
]
}
你好它只显示“消息”输出。但是为什么我有重复的结果？你能解释一下“我有重复的结果”是什么意思吗？你原来的问题中没有关于重复结果的内容。对不起。因为当我运行您提供的命令时，我有20条消息“客户服务差等”的结果，但实际上我在评论数据中仍有其他消息在相同的帖子id下，但它没有打印出来，这表明
db.sInsertpost\u id="28011986676_10155780942281677“$project\u id:0\u id$match$project$project消息$match