2019獨角獸企業重金招聘Python工程師標準>>>

db.hits.insert({"url":"www.datagru.cn","pv":102});
db.hits.insert({"url":"f.datagru.cn","pv":108});
db.hits.insert({"url":"www.itpub","pv":155});
> db.hits.find();
{ "_id" : ObjectId("56a20fa26efa22a91f284357"), "url" : "www.datagru.cn", "pv" : 102 }
{ "_id" : ObjectId("56a20faa6efa22a91f284358"), "url" : "f.datagru.cn", "pv" : 108 }
{ "_id" : ObjectId("56a20fb16efa22a91f284359"), "url" : "www.itpub", "pv" : 155 }
> db.hits.update({"url":"www.datagru.cn"},{$inc:{"pv":1}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.hits.find();
{ "_id" : ObjectId("56a20fa26efa22a91f284357"), "url" : "www.datagru.cn", "pv" : 103 }
{ "_id" : ObjectId("56a20faa6efa22a91f284358"), "url" : "f.datagru.cn", "pv" : 108 }
{ "_id" : ObjectId("56a20fb16efa22a91f284359"), "url" : "www.itpub", "pv" : 155 }
$set直接設置
> db.hits.find();
{ "_id" : ObjectId("56a20fa26efa22a91f284357"), "url" : "www.datagru.cn", "pv" : 103 }
{ "_id" : ObjectId("56a20faa6efa22a91f284358"), "url" : "f.datagru.cn", "pv" : 108, "ip" : 20 }
{ "_id" : ObjectId("56a20fb16efa22a91f284359"), "url" : "www.itpub", "pv" : 155 }
$unset刪除鍵值
> db.hits.update({"url":"f.datagru.cn"},{$unset:{"ip":20}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.hits.find();
{ "_id" : ObjectId("56a20fa26efa22a91f284357"), "url" : "www.datagru.cn", "pv" : 103 }
{ "_id" : ObjectId("56a20faa6efa22a91f284358"), "url" : "f.datagru.cn", "pv" : 108 }
{ "_id" : ObjectId("56a20fb16efa22a91f284359"), "url" : "www.itpub", "pv" : 155 }
數組修改器
db.hits.update({"url":"f.datagru.cn"},{"$set":{"users":[{"name":"hang","age":12},{"name":"huang","age":21}]}})
?
?db.hits.update({"url":"f.datagru.cn"},{"$set":{"users":[{"name":"hang","age":12},{"name":"huang","age":21}]}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.hits.find();
{ "_id" : ObjectId("56a20fa26efa22a91f284357"), "url" : "www.datagru.cn", "pv" : 103 }
{ "_id" : ObjectId("56a20fb16efa22a91f284359"), "url" : "www.itpub", "pv" : 155 }
{ "_id" : ObjectId("56a20faa6efa22a91f284358"), "url" : "f.datagru.cn", "pv" : 108, "users" : [ { "name" : "hang", "age" : 12 }, { "name" : "huang", "age" : 21 } ] }
為數組增加元素
db.hits.update({"url":"f.datagru.cn"},{"$push":{"users":{"name":"hang","age":12}}})
> db.hits.update({"url":"f.datagru.cn"},{"$push":{"users":{"name":"hang","age":12}}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.hits.find();
{ "_id" : ObjectId("56a20fa26efa22a91f284357"), "url" : "www.datagru.cn", "pv" : 103 }
{ "_id" : ObjectId("56a20fb16efa22a91f284359"), "url" : "www.itpub", "pv" : 155 }
{ "_id" : ObjectId("56a20faa6efa22a91f284358"), "url" : "f.datagru.cn", "pv" : 108, "users" : [ { "name" : "hang", "age" : 12 }, { "name" : "huang", "age" : 21 }, { "name" : "hang", "age" : 12 } ] }
定位修改
db.hits.update({"url":"f.datagru.cn"},{"$set":{"users.2.name":"liu"}})
> db.hits.update({"url":"f.datagru.cn"},{"$set":{"users.2.name":"liu"}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.hits.find();
{ "_id" : ObjectId("56a20fa26efa22a91f284357"), "url" : "www.datagru.cn", "pv" : 103 }
{ "_id" : ObjectId("56a20fb16efa22a91f284359"), "url" : "www.itpub", "pv" : 155 }
{ "_id" : ObjectId("56a20faa6efa22a91f284358"), "url" : "f.datagru.cn", "pv" : 108, "users" : [ { "name" : "hang", "age" : 12 }, { "name" : "huang", "age" : 21 }, { "name" : "liu", "age" : 12 } ] }
upsert


> db.runCommand({getLastError:1})
{
?? ?"connectionId" : 1,
?? ?"n" : 0,
?? ?"syncMillis" : 0,
?? ?"writtenTo" : null,
?? ?"err" : null,
?? ?"ok" : 1
}
mongodb查詢find


db.abc.insert([
{"a":23,"b":21,"c":34},
{"a":23,"b":32},
{"a":23,"b":24,"c":54},
{"a":23,"c":37},
{"a":31,"b":21,"c":37},
{"a":31,"b":25},
{"a":31,"c":34}

]
)

> db.abc.find()
{ "_id" : ObjectId("56a21d2c6efa22a91f28435a"), "a" : 23, "b" : 21, "c" : 34 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435b"), "a" : 23, "b" : 32 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435c"), "a" : 23, "b" : 24, "c" : 54 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435d"), "a" : 23, "c" : 37 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435e"), "a" : 31, "b" : 21, "c" : 37 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435f"), "a" : 31, "b" : 25 }
{ "_id" : ObjectId("56a21d2c6efa22a91f284360"), "a" : 31, "c" : 34 }
子鍵篩選
> db.abc.find({"a":23})
{ "_id" : ObjectId("56a21d2c6efa22a91f28435a"), "a" : 23, "b" : 21, "c" : 34 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435b"), "a" : 23, "b" : 32 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435c"), "a" : 23, "b" : 24, "c" : 54 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435d"), "a" : 23, "c" : 37 }
> db.abc.find({"a":23},{"b":1})
{ "_id" : ObjectId("56a21d2c6efa22a91f28435a"), "b" : 21 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435b"), "b" : 32 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435c"), "b" : 24 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435d") }
> db.abc.find({"a":23},{"b":1},{"c":1})1感興趣
{ "_id" : ObjectId("56a21d2c6efa22a91f28435a"), "b" : 21 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435b"), "b" : 32 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435c"), "b" : 24 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435d") }
> db.abc.find({"a":23},{"b":0})
{ "_id" : ObjectId("56a21d2c6efa22a91f28435a"), "a" : 23, "c" : 34 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435b"), "a" : 23 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435c"), "a" : 23, "c" : 54 }
{ "_id" : ObjectId("56a21d2c6efa22a91f28435d"), "a" : 23, "c" : 37 }
> db.abc.find({"a":23},{"_id":0})
{ "a" : 23, "b" : 21, "c" : 34 }
{ "a" : 23, "b" : 32 }
{ "a" : 23, "b" : 24, "c" : 54 }
{ "a" : 23, "c" : 37 }
> db.abc.find({"a":23},{"_id":0,"b":1})不能零和一混合除開_id
{ "b" : 21 }
{ "b" : 32 }
{ "b" : 24 }
{? }
操作符
$lt $lte????????????? db.abc.find({b:{"$gte":30,"$lt":35}})
$gt $gte
$all
$exists
$mod?????????????????? db.abc.find({b:{"$mod":[5,1]}})
$ne
$in??????????????????? db.abc.find({b:{"$in":[25,32]}})
$nin
$nor
$or???????????????????? db.abc.find({"$or":[{"b":32},{"c":54}]})
$size 元素個數
$slice列出一部分元素
$type

轉載于:https://my.oschina.net/goudingcheng/blog/608215

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