標籤:mail 利用 china 數學 地方 country 書籍 韓國 集合
1 資料準備
var persons = [{
name:"jim",
age:25,
email:"[email protected]",
c:89,m:96,e:87,
country:"USA",
books:["JS","C++","EXTJS","MONGODB"]
},
{
name:"tom",
age:25,
email:"[email protected]",
c:75,m:66,e:97,
country:"USA",
books:["PHP","JAVA","EXTJS","C++"]
},
{
name:"lili",
age:26,
email:"[email protected]",
c:75,m:63,e:97,
country:"USA",
books:["JS","JAVA","C#","MONGODB"]
},
{
name:"zhangsan",
age:27,
email:"[email protected]",
c:89,m:86,e:67,
country:"China",
books:["JS","JAVA","EXTJS","MONGODB"]
},
{
name:"lisi",
age:26,
email:"[email protected]",
c:53,m:96,e:83,
country:"China",
books:["JS","C#","PHP","MONGODB"]
},
{
name:"wangwu",
age:27,
email:"[email protected]",
c:45,m:65,e:99,
country:"China",
books:["JS","JAVA","C++","MONGODB"]
},
{
name:"zhaoliu",
age:27,
email:"[email protected]",
c:99,m:96,e:97,
country:"China",
books:["JS","JAVA","EXTJS","PHP"]
},
{
name:"piaoyingjun",
age:26,
email:"[email protected]",
c:39,m:54,e:53,
country:"Korea",
books:["JS","C#","EXTJS","MONGODB"]
},
{
name:"lizhenxian",
age:27,
email:"[email protected]",
c:35,m:56,e:47,
country:"Korea",
books:["JS","JAVA","EXTJS","MONGODB"]
},
{
name:"lixiaoli",
age:21,
email:"[email protected]",
c:36,m:86,e:32,
country:"Korea",
books:["JS","JAVA","PHP","MONGODB"]
},
{
name:"zhangsuying",
age:22,
email:"[email protected]",
c:45,m:63,e:77,
country:"Korea",
books:["JS","JAVA","C#","MONGODB"]
}]
for(var i = 0;i<persons.length;i++){
db.persons.insert(persons[i])
}
var persons = db.persons.find({name:"jim"})
2 查詢2.1 查詢出所有資料的指定鍵(name ,age ,country)
db.persons.find({},{name:1,age:1,country:1,_id:0})
2.2 查詢條件
查詢出年齡在25到27歲之間的學生
db.persons.find({age: {$gte:25,$lte:27},{_id:0,age:1})
查詢出所有不是韓國籍的學生的數學成績
db.persons.find({country:{$ne:"Korea"}},{_id:0,m:1})
2.3 包含或不包含:$in或$nin
查詢國籍是中國或美國的學生資訊
db.persons.find({country:{$in:["USA","China"]}})
查詢國籍不是中國或美國的學生資訊
db.persons.find({country:{$nin:["USA","China"]}})
2.4 OR查詢:$or
查詢語文成績大於85或者英語大於90的學生資訊
db.persons.find({$or:[{c:{$gte:85}},{e:{$gte:90}}]},{_id:0,c:1,e:1})
2.5 Null
把中國國籍的學生上增加新的鍵sex
db.person.update({country:"China"},{$set:{sex:"m"}})
查詢出sex 等於 null的學生
db.persons.find({sex:{$in:[null]}},{country:1})
2.6 正則查詢
查詢出名字中存在”li”的學生的資訊
db.persons.find({name:/li/i},{_id:0,name:1})
2.7 $not的使用,$not可以用到任何地方進行取反操作
查詢出名字中不存在”li”的學生的資訊
db.persons.find({name:{$not:/li/i}},{_id:0,name:1})
$not和$nin的區別是$not可以用在任何地方兒$nin是用到集合上的
2.8 數組查詢$all和index應用
查詢喜歡看MONGOD和JS的學生
db.persons.find({books:{$all:["MONGOBD","JS"]}},{books:1,_id:0})
查詢第二本書是JAVA的學習資訊
db.persons.find({"books.1":"JAVA"})
查詢指定長度數組$size它不能與比較查詢符一起使用(這是弊端)
查詢出喜歡的書籍數量是4本的學生
db.persons.find({books:{$size:4}},{_id:0,books:1})
2.9 查詢出喜歡的書籍數量大於3本的學生
增加欄位size
db.persons.update({},{$set:{size:4}},false, true)
改變書籍的更新方式,每次增加書籍的時候size增加1
db.persons.update({查詢器},{$push:{books:"ORACLE"},$inc:{size:1}})
利用$gt查詢
db.persons.find({size:{$gt:3}})
2.10 $slice操作符返迴文檔中指定數組的內部值
查詢出Jim書架中第2~4本書
db.persons.find({name:"jim"},{books:{"$slice":[1,3]}})
查詢出最後一本書
db.persons.find({name:"jim"},{books:{"$slice":-1},_id:0,name:1})
2.11 文檔查詢:$elemMatch
為jim添加學習簡曆文檔
var jim = [{
school :"K",
score:"A"
},{
school :"L",
score:"B"
},{
school :"J",
score:"A+"
}]
db.persons.update({name:"jim"},{$set:{school:jim}})
查詢出在K上過學的學生
db.persons.find({school:{$elemMatch:{school:"K",score:"A"}}})
2.12 Limit返回指定的資料條數
查詢出persons文檔中前5條資料
db.persons.find({},{_id:0,name:1}).limit(5)
2.13 Skip返回指定資料的跨度
查詢出persons文檔中5~10條的資料
db.persons.find({},{_id:0,name:1}).limit(5).skip(5)
2.14 .Sort返回按照年齡排序的資料[1,-1]
db.persons.find({},{_id:0,name:1,age:1}).sort({age:1})
MongoDB查詢操作