1排序sort()
| A降序排列 db.c4.find().sort().sort({age:-1});
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| B升序排列： db.c4.find().sort({age:-1});
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| C排序分页 db.collectionName.find().sort({age:-1}).skip(20).limit(10);
eg:db.c4.find().sort({age:-1}).skip(20).limit(10);
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2 $all,$in,$nin,$or,$nor,$exists
查询集合中的文档，$all主要用来查询数组中的包含关系，查询条件中只要有一个不包含就不返回。
| $all（只有都包含才会显示） |
| > db.c5.insert({name:’zhangsan’,age:[1,2,3,4,5,9,10]}); WriteResult({ “nInserted” : 1 }) > db.c5.insert({name:’lisi’,age:[2,4,7,9,10]}); WriteResult({ “nInserted” : 1 }) > db.c5.insert({name:’wangwu’,age:[4,7,8,16,24]}); WriteResult({ “nInserted” : 1 }) > db.c5.find({age:{$all:[4,7,9]}}); { “_id” : ObjectId(“543e20c5e2c90313035e7d06”), “name” : “lisi”, “age” : [ 2, 4, 7, 9, 10 ] } >
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| $in(只要有包含1个就显示) |
| > db.c5.find(); { “_id” : ObjectId(“543e2098e2c90313035e7d05”), “name” : “zhangsan”, “age” : [ 1, 2, 3, 4, 5, 9, 10 ] } { “_id” : ObjectId(“543e20c5e2c90313035e7d06”), “name” : “lisi”, “age” : [ 2, 4, 7, 9, 10 ] } { “_id” : ObjectId(“543e20ece2c90313035e7d07”), “name” : “wangwu”, “age” : [ 4, 7, 8, 16, 24 ] } >db.c5.find({age:{$in:[1,2,3]}}); { “_id” : ObjectId(“543e2098e2c90313035e7d05”), “name” : “zhangsan”, “age” : [ 1, 2, 3, 4, 5, 9, 10 ] } { “_id” : ObjectId(“543e20c5e2c90313035e7d06”), “name” : “lisi”, “age” : [ 2, 4, 7, 9, 10 ] } >
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| $nin (表示不包含的才显示) |
| > db.c5.find(); { “_id” : ObjectId(“543e2098e2c90313035e7d05”), “name” : “zhangsan”, “age” : [ 1, 2, 3, 4, 5, 9, 10 ] } { “_id” : ObjectId(“543e20c5e2c90313035e7d06”), “name” : “lisi”, “age” : [ 2, 4, 7, 9, 10 ] } { “_id” : ObjectId(“543e20ece2c90313035e7d07”), “name” : “wangwu”, “age” : [ 4, 7, 8, 16, 24 ] } >db.c5.find({age:{$nin:[1,2,3]}}); { “_id” : ObjectId(“543e20ece2c90313035e7d07”), “name” : “wangwu”, “age” : [ 4, 7, 8, 16, 24 ] } >
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| $or (相当于或) |
| > db.c6.find({$or:[{name:”zhangsan”},{age:25}]}) { “_id” : ObjectId(“543e2409e2c90313035e7d08”), “name” : “zhangsan”, “age” : 24 } { “_id” : ObjectId(“543e2432e2c90313035e7d09”), “name” : “lisi”, “age” : 25 } { “_id” : ObjectId(“543e2451e2c90313035e7d0a”), “name” : “wangwu”, “age” : 25 } >
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| $nor 查询集合中的文档，$nor,表示根据条件过滤掉某些数据，例如：查询name不是user2,age不是3的文档，命令为： db.collectionName.find({$nor:[{name:”user1”},{age:3}]}); |
| > db.c6.find(); { “_id” : ObjectId(“543e2409e2c90313035e7d08”), “name” : “zhangsan”, “age” : 24 } { “_id” : ObjectId(“543e2432e2c90313035e7d09”), “name” : “lisi”, “age” : 25 } { “_id” : ObjectId(“543e2451e2c90313035e7d0a”), “name” : “wangwu”, “age” : 25 } > db.c6.find({$or:[{name:”zhangsan”},{age:25}]}) { “_id” : ObjectId(“543e2409e2c90313035e7d08”), “name” : “zhangsan”, “age” : 24 } { “_id” : ObjectId(“543e2432e2c90313035e7d09”), “name” : “lisi”, “age” : 25 } { “_id” : ObjectId(“543e2451e2c90313035e7d0a”), “name” : “wangwu”, “age” : 25 } > db.c6.find({$nor:[{name:”zhangsan”},{age:25}]}) >
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| $exists 查询集合中的文档，$exists，用于查询集合中存在某个键的文档或不存在某个键的文档，例如查询customer集合中存在name键的所有文档，可以使用db.collectionName.find({name:{$exists:1}}); $exists:1表示真，指存在 $exists:0表示假，指不存在 |
| 分别查询包含name属性的和包含sex属性的数据
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3游标
| 游标（相当于数据库的一个临时的存储区，它是存放在内存中的，查找某个集合返回记录，我可以把这些记录放在游标当中，然后我可以迭代游标）。 查询集合中的文档，类似关系型数据库，mongodb中也有游标的概念
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4更新
| > show dbs; admin (empty) local 0.078GB test 0.078GB > use toto switched to db toto > db toto > use test switched to db test > use toto switched to db toto > db Toto > db.c1.insert({name:"zhangsan",age:19}); WriteResult({ "nInserted" : 1 }) > db.c1.insert({name:"lis",age:25}); WriteResult({ "nInserted" : 1 }) > db.c1.insert({name:"wangwu",age:23}); WriteResult({ "nInserted" : 1 }) > db.c1.insert({name:"zhaoliu",age:27}); WriteResult({ "nInserted" : 1 }) > db.c1.insert({name:"tianqi",age:33}); WriteResult({ "nInserted" : 1 }) > > db.c1.find(); { "_id" : ObjectId("543e3223e2c90313035e7d0e"), "name" : "zhangsan", "age" : 19 } { "_id" : ObjectId("543e3244e2c90313035e7d0f"), "name" : "lis", "age" : 25 } { "_id" : ObjectId("543e3259e2c90313035e7d10"), "name" : "wangwu", "age" : 23 } { "_id" : ObjectId("543e3270e2c90313035e7d11"), "name" : "zhaoliu", "age" : 27 } { "_id" : ObjectId("543e3294e2c90313035e7d12"), "name" : "tianqi", "age" : 33 } >
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| 更新操作： db.collectionName.update({条件},{修改的值})，函数中4个参数的介绍 1． 设置更新的条件 2． 设置更新的内容的对象 3． 如果没有符合条件的记录，是否新增一条记录(取值为0/1) 4． 如果有多条记录符合，是否全部更新（取值0/1） db.collectionName.update({条件},{修改的值}) 1． 更新的时候只更新到一条，且其它的key:value覆盖掉了 2． 我只更新到一条 > db.c1.find(); { "_id" : ObjectId("543e3244e2c90313035e7d0f"), "age" : 36 } { "_id" : ObjectId("543e3259e2c90313035e7d10"), "name" : "wangwu", "age" : 23 } { "_id" : ObjectId("543e3270e2c90313035e7d11"), "name" : "zhaoliu", "age" : 27 } { "_id" : ObjectId("543e3294e2c90313035e7d12"), "name" : "tianqi", "age" : 33 } > db.c1.update({age:36},{$set:{name:"zhangsan"}},0,1); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 }) > db.c1.find(); { "_id" : ObjectId("543e3244e2c90313035e7d0f"), "age" : 36, "name" : "zhangsan" } { "_id" : ObjectId("543e3259e2c90313035e7d10"), "name" : "wangwu", "age" : 23 } { "_id" : ObjectId("543e3270e2c90313035e7d11"), "name" : "zhaoliu", "age" : 27 } { "_id" : ObjectId("543e3294e2c90313035e7d12"), "name" : "tianqi", "age" : 33 } >
> db.c1.find(); { "_id" : ObjectId("543e3244e2c90313035e7d0f"), "age" : 36, "name" : "zhangsan" } { "_id" : ObjectId("543e3259e2c90313035e7d10"), "name" : "wangwu", "age" : 23 } { "_id" : ObjectId("543e3270e2c90313035e7d11"), "name" : "zhaoliu", "age" : 27 } { "_id" : ObjectId("543e3294e2c90313035e7d12"), "name" : "tianqi", "age" : 33 } > db.c1.update({age:24},{$set:{name:"tuzuoquan",age:24}},1,0); WriteResult({ "nMatched" : 0, "nUpserted" : 1, "nModified" : 0, "_id" : ObjectId("543e3644dd76b7dcaba68faf") }) > db.c1.find(); { "_id" : ObjectId("543e3244e2c90313035e7d0f"), "age" : 36, "name" : "zhangsan" } { "_id" : ObjectId("543e3259e2c90313035e7d10"), "name" : "wangwu", "age" : 23 } { "_id" : ObjectId("543e3270e2c90313035e7d11"), "name" : "zhaoliu", "age" : 27 } { "_id" : ObjectId("543e3294e2c90313035e7d12"), "name" : "tianqi", "age" : 33 } { "_id" : ObjectId("543e3644dd76b7dcaba68faf"), "age" : 24, "name" : "tuzuoquan" } >
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5 inc
| 更新集合中的文档，使用$inc将集合中name为user1的age加1，其它键不变，$inc表示使某个键值加减指定的数值。 |
| > for(var i=1;i<=20;i++){ db.c2.insert({name:"tuzuoquan",age:24}); } WriteResult({ "nInserted" : 1 }) > db.c2.find(); { "_id" : ObjectId("543e386ee2c90313035e7d13"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e386ee2c90313035e7d14"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d15"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d16"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d17"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d18"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d19"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d1a"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d1b"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d1c"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d1d"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d1e"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d1f"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d20"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d21"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d22"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d23"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d24"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d25"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e38a5e2c90313035e7d26"), "name" : "tuzuoquan", "age" : 24 } > db.c2.update({name:"tuzuoquan"},{$inc:{age:1}},0,1);
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6 $unset(删除某个键)
| 更新集合中的文档，$unset用来删除某个键，例如删除name为user1的文档中address键，可以使用命令： db.c1.update({name:”user”},{$unset:{age:1}},0,1); |
| >db.c2.update({name:"tuzuoquan"},{$unset:{age:1}},0,1); WriteResult({ "nMatched" : 20, "nUpserted" : 0, "nModified" : 20 }) > db.c2.find(); { "_id" : ObjectId("543e386ee2c90313035e7d13"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e386ee2c90313035e7d14"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d15"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d16"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d17"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d18"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d19"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d1a"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d1b"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d1c"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d1d"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d1e"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d1f"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d20"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d21"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d22"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d23"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d24"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d25"), "name" : "tuzuoquan" } { "_id" : ObjectId("543e38a5e2c90313035e7d26"), "name" : "tuzuoquan" } >
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