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  • mongodb操作

    插入操作

    在collection中创建documnets, 如果collection不存在,则会自动创建

    单条插入: db.collection.insertOne()

    批量插入: db.collection.insertMany()

    单条数据插入

    db.inventory.insertOne(
       { item: "canvas", qty: 100, tags: ["cotton"], size: { h: 28, w: 35.5, uom: "cm" } }
    )
    

    多条数据插入

    db.inventory.insertMany([
       { item: "journal", qty: 25, tags: ["blank", "red"], size: { h: 14, w: 21, uom: "cm" } },
       { item: "mat", qty: 85, tags: ["gray"], size: { h: 27.9, w: 35.5, uom: "cm" } },
       { item: "mousepad", qty: 25, tags: ["gel", "blue"], size: { h: 19, w: 22.85, uom: "cm" } }
    ])
    

    读取操作

    简单查询

    db.inventory.find( {} )
    VS
    SELECT * FROM inventory
    

    条件查询

    db.inventory.find( { status: "D" } )
    VS
    SELECT * FROM inventory WHERE status = "D"
    

    多条件查询

    • and
    db.inventory.find( { status: "A", qty: { $lt: 30 } } )
    db.inventory.find( { $and: [ { status: "A" }, { qty: { $lt: 30 } } ] } )
    VS
    SELECT * FROM inventory WHERE status = "A" AND qty < 30
    
    • or
    db.inventory.find( { $or: [ { status: "A" }, { qty: { $lt: 30 } } ] } )
    VS
    SELECT * FROM inventory WHERE status = "A" OR qty < 30
    
    • and - or
    db.inventory.find( {
         status: "A",
         $or: [ { qty: { $lt: 30 } }, { item: /^p/ } ]
    } )
    VS
    SELECT * FROM inventory WHERE status = "A" AND ( qty < 30 OR item LIKE "p%")
    
    • 备注:

      db.collection.findone() 方法是在 db.collection.find()方法中加入了 limit 1 的条件;

      常用条件表达式:

      mongo表达式 常见表示 表达式描述
      $gt > 大于
      $gte >= 大于等于
      $lt < 小于
      $lte <= 小于等于

    范围查询

    db.inventory.find( { status: { $in: [ "A", "D" ] } } )
    VS
    SELECT * FROM inventory WHERE status in ("A", "D")
    

    模糊查询

    db.products.find( { sku: { $regex: /789$/ } } )
    VS
    SELECT * FROM products WHERE sku like "%789";
    

    联合查询

    • union all
    db.suppliers.aggregate([   // 当前表
       { $project: { state: 1, _id: 0 } },
       { $unionWith: { 
       		coll: "warehouses",  // 需要union的表
       		pipeline: [          // 需要union的表查询条件
       			{ $project: { state: 1, _id: 0 } } ]} }
       		] 
       	)
    
    • left join
    db.orders.aggregate([  // 左表
       {
         $lookup:
           {
             from: "inventory",  // 右表
             localField: "item",  // 左表关键字
             foreignField: "sku", // 右表关键字
             as: "inventory_docs" // 右表关联数据别名
           }
      }
    ])
    

    分组查询

    db.sales.aggregate( [
      {
        $group: {
           _id: null,
           count: { $sum: 1 }
        }
      }
    ] )
    
    SELECT COUNT(*) AS count FROM sales
    
    db.sales.aggregate(
      [
        // First Stage
        {
          $group :
            {
              _id : "$item",
              totalSaleAmount: { $sum: { $multiply: [ "$price", "$quantity" ] } }
            }
         },
         // Second Stage
         {
           $match: { "totalSaleAmount": { $gte: 100 } }
         }
       ]
     )
    
    SELECT item,
       Sum(( price * quantity )) AS totalSaleAmount
    FROM   sales
    GROUP  BY item
    HAVING totalSaleAmount >= 100
    
    db.sales.aggregate([
      // First Stage
      {
        $match : { "date": { $gte: new ISODate("2014-01-01"), $lt: new ISODate("2015-01-01") } }
      },
      // Second Stage
      {
        $group : {
           _id : { $dateToString: { format: "%Y-%m-%d", date: "$date" } },
           totalSaleAmount: { $sum: { $multiply: [ "$price", "$quantity" ] } },
           averageQuantity: { $avg: "$quantity" },
           count: { $sum: 1 }
        }
      },
      // Third Stage
      {
        $sort : { totalSaleAmount: -1 }
      }
     ])
    
    SELECT date,
           Sum(( price * quantity )) AS totalSaleAmount,
           Avg(quantity)             AS averageQuantity,
           Count(*)                  AS Count
    FROM   sales
    GROUP  BY Date(date)
    ORDER  BY totalSaleAmount DESC
    

    更新操作

    1. 更新单个文档

    db.collection.updateOne(, , )

    $set $set修饰符来更新字段

    $currentDate 将字段更新为当前时间

    db.inventory.updateOne(
       { item: "paper" },
       {
         $set: { "size.uom": "cm", status: "P" },
         $currentDate: { lastModified: true }
       }
    )
    
    1. 更新多个文档
    db.inventory.updateMany(
       { "qty": { $lt: 50 } },
       {
         $set: { "size.uom": "in", status: "P" },
         $currentDate: { lastModified: true }
       }
    )
    
    1. 替换文档

    替换文档时,只写键值对就可以了,不要更新运算符

    db.inventory.replaceOne(
       { item: "paper" },
       { item: "paper", instock: [ { warehouse: "A", qty: 60 }, { warehouse: "B", qty: 40 } ] }
    )
    
    • mongodb中的所有写操作都是单个文档级别的原子操作
    • _id 字段设置后,将无法更新 _ id 字段的值, 也无法使用具有不同 _id字段值的替换文档替换现有文档
    • mongodb会在执行写操作后保留文档字段的顺序。 _id 字段始终时第一个字段

    删除操作

    1. 全量删除
    db.inventory.deleteMany({})
    
    1. 根据条件删除
    db.inventory.deleteMany({ status : "A" })
    
    1. 只删除一个
    db.inventory.deleteOne( { status: "D" } )
    

    删除方法

    db.collection.deleteOne() 即使多个文档可能与指定过滤器匹配,也最多删除一个与指定过滤器匹配的文档。3.2版中的新功能。
    db.collection.deleteMany() 删除所有与指定过滤器匹配的文档。3.2版中的新功能。
    db.collection.remove() 删除单个文档或与指定过滤器匹配的所有文档。
    db.collection.findOneAndDelete() 提供了一个排序选项。该选项允许删除按指定顺序排序的第一个文档。
    db.collection.findAndModify() 提供排序选项。该选项允许删除按指定顺序排序的第一个文档。
    db.collection.bulkWrite()

    进阶

    查询进阶

    插入数据源

    db.inventory.insertMany( [
       { item: "journal", qty: 25, size: { h: 14, w: 21, uom: "cm" }, status: "A" },
       { item: "notebook", qty: 50, size: { h: 8.5, w: 11, uom: "in" }, status: "A" },
       { item: "paper", qty: 100, size: { h: 8.5, w: 11, uom: "in" }, status: "D" },
       { item: "planner", qty: 75, size: { h: 22.85, w: 30, uom: "cm" }, status: "D" },
       { item: "postcard", qty: 45, size: { h: 10, w: 15.25, uom: "cm" }, status: "A" }
    ]);
    

    嵌套文档查询

    在文档的单个字段上进行查询

    查询 size={ h: 14, w: 21, uom: "cm" } 的数据

    db.inventory.find( { size: { h: 14, w: 21, uom: "cm" } } )
    

    在文档内的嵌套字段上进行查询

    查询size.uom=in (size下的内嵌文档中的uom)的数据

    db.inventory.find( { "size.uom": "in" } )
    

    数组查询

    1. 匹配一个数组

    完全匹配模式,普通查询都是完全匹配模式,value必须完全一致

    db.inventory.find( { tags: ["red", "blank"] } )
    

    自由匹配模式

    $all ,查询出数组中同时包含"red"和 "blank"元素的数据,不管顺序

    db.inventory.find( { tags: { $all: ["red", "blank"] } } )
    
    1. 根据数组中的元素进行查找(满足一个条件即可)

    根据数组中的某一个元素,查询包含该元素的数据

    数组元素中还包含 “red” 的数据

    db.inventory.find( { tags: "red" } )
    

    数组中至少有一个元素>25 的数据

    db.inventory.find( { dim_cm: { $gt: 25 } } )
    

    数组元素中包含 >15或<20 或 15<x<20 的数据

    db.inventory.find( { dim_cm: { $gt: 15, $lt: 20 } } )
    
    1. 指定数组元素多重条件(满足所有条件)

    $elemMatch 指定多个条件, 至少一个元素满足条件 >22且<30

    db.inventory.find( { dim_cm: { $elemMatch: { $gt: 22, $lt: 30 } } } )
    

    按照元素索引位置进行查找

    查找数组中第二个元素>25 的数据

    array.index 数组.元素下标

    db.inventory.find( { "dim_cm.1": { $gt: 25 } } )
    

    根据数组元素个数查询

    $size

    db.inventory.find( { "tags": { $size: 3 } } )
    
    1. 查询嵌入式文档数组

    嵌入式文档查询上边已经介绍过了

    数组查询也已经介绍过了

    现在时将两者综合运用

    在嵌入式文档数组中的字段上使用查询条件

    db.inventory.find( { 'instock.qty': { $lte: 20 } } )
    

    在嵌入式文档数组中的元素索引上使用查询条件

    db.inventory.find( { 'instock.0.qty': { $lte: 20 } } )
    

    返回查询的字段

    db.inventory.find( { status: "A" }, { item: 1, status: 1 } )
    VS
    SELECT _id, item, status from inventory WHERE status = "A"
    

    如果不想返回_id 字段,可以将_id:0

    db.inventory.find( { status: "A" }, { item: 1, status: 1, _id: 0 } )
    

    想要返回什么字段,字段的值就==1,不想显示什么字段就 ==0

    如果全是 1,则全部返回;

    有0有1的,返回为1 的

    全都是0,返回非0 的其他全部字段

    $slice 分片,根据数组下标范围进行数组截取, -1 表示取最后一个数据

    db.inventory.find( { status: "A" }, { item: 1, status: 1, instock: { $slice: -1 } } )
    

    查询为空或者字段缺失的数据

    db.inventory.insertMany([
       { _id: 1, item: null },
       { _id: 2 }
    ])
    
    1. 平等过滤器,两条数据都会被查出来
    db.inventory.find( { item: null } )
    
    1. 类型检查

    只返回类型为null的数据

    $type

    db.inventory.find( { item : { $type: 10 } } )
    
    • 类型说明列表
    Type Number Alias Notes
    Double 1 “double”
    String 2 “string”
    Object 3 “object”
    Array 4 “array”
    Binary data 5 “binData”
    Undefined 6 “undefined” Deprecated.
    ObjectId 7 “objectId”
    Boolean 8 “bool”
    Date 9 “date”
    Null 10 “null”
    Regular Expression 11 “regex”
    DBPointer 12 “dbPointer” Deprecated.
    JavaScript 13 “javascript”
    Symbol 14 “symbol” Deprecated.
    JavaScript code with scope 15 “javascriptWithScope” Deprecated in MongoDB 4.4.
    32-bit integer 16 “int”
    Timestamp 17 “timestamp”
    64-bit integer 18 “long”
    Decimal128 19 “decimal” New in version 3.4.
    Min key -1 “minKey”
    Max key 127 “maxKey”
    1. 存在检查

    查询不包含item字段的文档

    $exists

    db.inventory.find( { item : { $exists: false } } )
    

    聚合管道更新

    @since4.2

    使用聚合管道可以实现更具表达力的更新语句

    什么是管道?pipline ? ===> 就是 ==> [ ]

    $addFields 新增字段 $set 更新字段
    $project $unset
    $replaceRoot $replaceWith

    $set 更新字段

    $trunc 将数字阶段为整数或指定的小数位

    返回整数

    db.samples.aggregate([
       { $project: { truncatedValue: { $trunc: [ "$value", 0 ] } } }
    ])
    

    返回保留一位小数

    db.samples.aggregate([
       { $project: { truncatedValue: { $trunc: [ "$value", 1 ] } } }
    ])
    

    -1是什么意思?

    The following aggregation returns value truncated to the first place

    下面的聚合返回截断到第一个位置的值

    { _id: 1, value: 19.25 }
    
    db.samples.aggregate([
       { $project: { truncatedValue: { $trunc: [ "$value", -1 ] } } }
    ])
    
    { "_id" : 1, "truncatedValue" : 10 }
    

    $addFields 新增字段

    $mergeObjects 有就更新,没有就填充

    $concatArrays 数组拼接

    $map 将表达式应用于数组中的每个项目,并返回具有应用结果的数组

    db.collection.updateOne() 即使多个文档可能与指定的过滤器匹配,也最多更新一个与指定的过滤器匹配的文档。3.2版中的新功能。
    db.collection.updateMany() 更新所有与指定过滤器匹配的文档。3.2版中的新功能。
    db.collection.replaceOne() 即使多个文档可能与指定过滤器匹配,也最多替换一个与指定过滤器匹配的文档。3.2版中的新功能。
    db.collection.update() 更新或替换与指定过滤器匹配的单个文档,或更新与指定过滤器匹配的所有文档。默认情况下,该db.collection.update()方法更新单个文档。要更新多个文档,请使用multi选项。
    db.collection.findOneAndReplace()
    db.collection.findOneAndUpdate()
    db.collection.findAndModify()
    db.collection.save()
    db.collection.bulkWrite()

    批量操作

    try {
       db.characters.bulkWrite(
          [
             { insertOne :
                {
                   "document" :
                   {
                      "_id" : 4, "char" : "Dithras", "class" : "barbarian", "lvl" : 4
                   }
                }
             },
             { insertOne :
                {
                   "document" :
                   {
                      "_id" : 5, "char" : "Taeln", "class" : "fighter", "lvl" : 3
                   }
                }
             },
             { updateOne :
                {
                   "filter" : { "char" : "Eldon" },
                   "update" : { $set : { "status" : "Critical Injury" } }
                }
             },
             { deleteOne :
                { "filter" : { "char" : "Brisbane" } }
             },
             { replaceOne :
                {
                   "filter" : { "char" : "Meldane" },
                   "replacement" : { "char" : "Tanys", "class" : "oracle", "lvl" : 4 }
                }
             }
          ]
       );
    }
    catch (e) {
       print(e);
    }
    

    聚合函数

    $lookup

    table joins 表关联

    什么意思?

    联合查询,将关联表的数据以as的字段进行绑定

    db.orders.insert([
       { "_id" : 1, "item" : "almonds", "price" : 12, "quantity" : 2 },
       { "_id" : 2, "item" : "pecans", "price" : 20, "quantity" : 1 },
       { "_id" : 3  }
    ])
    
    db.inventory.insert([
       { "_id" : 1, "sku" : "almonds", "description": "product 1", "instock" : 120 },
       { "_id" : 2, "sku" : "bread", "description": "product 2", "instock" : 80 },
       { "_id" : 3, "sku" : "cashews", "description": "product 3", "instock" : 60 },
       { "_id" : 4, "sku" : "pecans", "description": "product 4", "instock" : 70 },
       { "_id" : 5, "sku": null, "description": "Incomplete" },
       { "_id" : 6 }
    ])
    
    db.orders.aggregate([  // 左表
       {
         $lookup:
           {
             from: "inventory",  // 右表
             localField: "item",  // 左表关键字
             foreignField: "sku", // 右表关键字
             as: "inventory_docs" // 右表关联数据别名
           }
      }
    ])
    
    {
       "_id" : 1,
       "item" : "almonds",
       "price" : 12,
       "quantity" : 2,
       "inventory_docs" : [
          { "_id" : 1, "sku" : "almonds", "description" : "product 1", "instock" : 120 }
       ]
    }
    {
       "_id" : 2,
       "item" : "pecans",
       "price" : 20,
       "quantity" : 1,
       "inventory_docs" : [
          { "_id" : 4, "sku" : "pecans", "description" : "product 4", "instock" : 70 }
       ]
    }
    {
       "_id" : 3,
       "inventory_docs" : [
          { "_id" : 5, "sku" : null, "description" : "Incomplete" },
          { "_id" : 6 }
       ]
    }
    

    $out

    SELECT INTO NEW_TABLE

    将聚合管道返回的文档,输出到指定的集合

    就是将查询出来的结果插入到另外的集合中(可以是不同的数据库)

    插入到同一个数据库中

    1. 查询test 数据库的 books 集合
    2. 将返回结果写入 authors 集合中
    db.getSiblingDB("test").books.aggregate( [
        { $group : { _id : "$author", books: { $push: "$title" } } },
        { $out : "authors" }
    ] )
    

    插入到不同的数据库中

    1. 查询test 数据库的 books 集合
    2. 将返回结果插入到 reporting 数据库的 authors 集合中
    db.getSiblingDB("test").books.aggregate( [
        { $group : { _id : "$author", books: { $push: "$title" } } },
        { $out : { db: "reporting", coll: "authors" } }
    ] )
    

    数据库操作相关常用方法介绍

    https://blog.csdn.net/zhaoyong421127/article/details/51242691

    $merge

    简单的merge操作和out的效果是一样的,都是将上一步的结果插入到一个新的集合中,只能是当前数据库

    db.sales.aggregate( [
       { $project: { _id: 0 } },
       { $merge : { into : "newCollection" } }
    ] )
    

    on -指定条件

    whenMatched : 当on的数据被匹配到(已存在)时,执行 ‘replace’ 更新操作

    whenNotMatched :当on的数据没有被匹配到时(不存在),执行插入操作

    db.getSiblingDB("zoo").salaries.aggregate( [
       { $group: { _id: { fiscal_year: "$fiscal_year", dept: "$dept" }, salaries: { $sum: "$salary" } } },
       { $merge : { into: { db: "reporting", coll: "budgets" }, on: "_id",  whenMatched: "replace", whenNotMatched: "insert" } }
    ] )
    

    当数据被匹配到的时候,增加新的字段 thumpbsup , thumbsdown]

    没被匹配上进行插入

    db.votes.aggregate([
       { $match: { date: { $gte: new Date("2019-05-07"), $lt: new Date("2019-05-08") } } },
       { $project: { _id: { $dateToString: { format: "%Y-%m", date: "$date" } }, thumbsup: 1, thumbsdown: 1 } },
       { $merge: {
             into: "monthlytotals",
             on: "_id",
             whenMatched:  [
                { $addFields: {
                    thumbsup: { $add:[ "$thumbsup", "$$new.thumbsup" ] },
                    thumbsdown: { $add: [ "$thumbsdown", "$$new.thumbsdown" ] }
                } } ],
             whenNotMatched: "insert"
       } }
    ])
    
    对日期格式进行转换
    $dateToString: { format: "%Y-%m", date: "$date" }
    
    
    如果输出集合具有文档:
    { _id: 1, a: 1, b: 1 }
    
    并且聚合结果有文件:
    { _id: 1, b: 5, z: 1 }
    
    然后,合并的文档为:
    { _id: 1, a: 1, b: 5, z: 1 }
    

    $unionWith

    联合查询

    db.suppliers.aggregate([
       { $project: { state: 1, _id: 0 } },
       { $unionWith: { coll: "warehouses", pipeline: [ { $project: { state: 1, _id: 0 } } ]} }
    ])
    

    $unwind

    数据展开

    db.inventory.insertOne({ "_id" : 1, "item" : "ABC1", sizes: [ "S", "M", "L"] })
    

    数据展开

    db.inventory.aggregate( [ { $unwind : "$sizes" } ] )
    

    展开后的结果

    
    { "_id" : 1, "item" : "ABC1", "sizes" : "S" }
    { "_id" : 1, "item" : "ABC1", "sizes" : "M" }
    { "_id" : 1, "item" : "ABC1", "sizes" : "L" }
    

    $unset

    $unset是$project阶段的别名,用于删除/排除字段:

    什么意思?

    查询的时候,不显示某些字段

    $facet

    同一阶段。可以在一个文档上同时添加多个pipline,输出多个结果

    返回的结果以文档数组形式存储

    啥意思?

    一个文档包含两个数字 1,2

    可以同时计算 + - × ÷

    返回结果 [3,-1,2,0.5]

    文本搜索

    文本索引,,支持对字符串内容的文本搜索查询

    1. 在文本集合上创建索引, 一个集合只能有一个文本搜索索引,该索引可涵盖多字段

    创建索引

    db.stores.createIndex( { name: "text", description: "text" } )
    

    进行查询

    多字符串查询查询, 分别包含 java ,coffee, shop 内容的数据

    db.stores.find( { $text: { $search: "java coffee shop" } } )
    

    单字符串查询

    db.stores.find( { $text: { $search: ""coffee shop"" } } )
    

    包含 java, shop 不包含 coffee

    db.stores.find( { $text: { $search: "java shop -coffee" } } )
    

    $accumulator (aggregation)

    $addToSet (aggregation)

    $allElementsTrue (aggregation)

    $anyElementTrue (aggregation)

    $binarySize (aggregation)

    $bsonSize (aggregation)

    $ceil (aggregation)

    $cmp (aggregation)

    $concat (aggregation)

    $cond (aggregation)

    $convert (aggregation)

    $degreesToRadians (aggregation)

    $filter (aggregation)

    $first (aggregation accumulator)

    $first (aggregation)

    $floor (aggregation)

    $function (aggregation)

    $ifNull (aggregation)

    $in (aggregation)

    $last (aggregation accumulator)

    $last (aggregation)

    $let (aggregation)

    $literal (aggregation)

    $ln (aggregation)

    $ltrim (aggregation)

    $map (aggregation)

    $mergeObjects (aggregation)

    $meta$min (aggregation)

    $not (aggregation)

    $or (aggregation)

    $push (aggregation)

    $radiansToDegrees (aggregation)

    $range (aggregation)

    $reduce (aggregation)

    $regexFind (aggregation)

    $regexFindAll (aggregation)

    $regexMatch (aggregation)

    $replaceOne (aggregation)

    $replaceAll (aggregation)

    $reverseArray (aggregation)

    $round (aggregation)

    $rtrim (aggregation)

    $second (aggregation)

    $setDifference (aggregation)

    $setEquals (aggregation)

    $setIntersection (aggregation)

    $setIsSubset (aggregation)

    $setUnion (aggregation)

    $size (aggregation)

    $slice (aggregation)

    $split (aggregation)

    $stdDevPop (aggregation)

    $stdDevSamp (aggregation)

    $strcasecmp (aggregation)

    $strLenBytes (aggregation)

    $strLenCP (aggregation)

    $substr (aggregation)

    $substrBytes (aggregation)

    $substrCP (aggregation)

    $subtract (aggregation)

    $switch (aggregation)

    功能函数

    $indexOfArray (aggregation)

    $indexOfBytes (aggregation)

    $indexOfCP (aggregation)

    $isArray (aggregation)

    $isNumber (aggregation)

    数组处理

    $arrayElemAt (aggregation)

    $arrayToObject (aggregation)

    $concatArrays (aggregation)

    $objectToArray (aggregation)

    字符串处理

    数据类型处理

    $toBool (aggregation)

    $toDate (aggregation)

    $toDecimal (aggregation)

    $toDouble(aggregation)

    $toInt (aggregation)

    $toLong (aggregation)

    $toObjectId (aggregation)

    $toString (aggregation)

    $trunc (aggregation)

    字符串处理

    $toLower (aggregation)

    $toUpper (aggregation)

    $trim (aggregation)

    日期处理

    $dateFromParts (aggregation)

    $dateToParts (aggregation)

    $dateFromString (aggregation)

    $dateToString (aggregation)

    $dayOfMonth (aggregation)

    $dayOfWeek (aggregation)

    $dayOfYear (aggregation)

    $type (aggregation)

    $week (aggregation)

    $year (aggregation)

    $hour (aggregation)

    $month (aggregation)

    $millisecond (aggregation)

    $minute (aggregation)

    $zip (aggregation)

    $isoDayOfWeek (aggregation)

    $isoWeek (aggregation)

    $isoWeekYear (aggregation)

    数学计算

    $add (aggregation)

    $divide (aggregation)

    $abs (aggregation)

    $multiply (aggregation)

    $mod (aggregation)

    $avg (aggregation)

    $max (aggregation)

    三角函数

    $log (aggregation)

    $log10 (aggregation)

    $sin (aggregation)

    $sqrt (aggregation)

    $sum (aggregation)

    $tan (aggregation)

    $cos (aggregation)

    $atanh (aggregation)

    $atan2 (aggregation)

    $asin (aggregation)

    $asinh (aggregation)

    $atan (aggregation)

    $acos (aggregation)

    $acosh (aggregation)

    $exp (aggregation)

    比较运算符

    $lt (aggregation)

    $lte (aggregation)

    $ne (aggregation)

    $pow (aggregation)

    $gt (aggregation)

    $gte (aggregation)

    $eq (aggregation)

    $ addFields(聚合)

    $ bucket(汇总)

    $ bucketAuto(聚合)

    $ collStats(汇总)

    $ count(汇总)

    $ currentOp(汇总)

    $ facet(汇总)

    $ geoNear(汇总)

    $ graphLookup(汇总)

    $ group(汇总)

    $ indexStats(汇总)

    $ limit(汇总)

    $ listLocalSessions

    $ listSessions

    $ lookup(汇总)

    $ match(汇总)

    $合并(汇总)

    $ out(汇总)

    $ planCacheStats

    $ project(汇总)

    $ redact(汇总)

    $ replaceRoot(聚合)

    $ replaceWith(汇总)

    $ sample(汇总)

    $ sampleRate(汇总)

    $ set(汇总)

    $ skip(汇总)

    $ sort(汇总)

    $ sortByCount(汇总)

    $ unionWith(聚合)

    $ unset(汇总)

    $ unwind(汇总)

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  • 原文地址:https://www.cnblogs.com/cfb513142804/p/14298939.html
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