mongo-pymongo 数组操作

因为刚刚开始使用mongodb时时间比较急，没有比较系统的去学习文档，所以当时在对数组操作时都是自己写代码去操作，所以专门把数组操作单独记录下来

https://docs.mongodb.com/manual/tutorial/query-documents/#read-operations-arrays

插入测试数据

db.users.insert(
[
{
_id: 1,
name: "sue",
age: 19,
type: 1,
status: "P",
favorites: { artist: "Picasso", food: "pizza" },
finished: [ 17, 3 ],
badges: [ "blue", "black" ],
points: [
{ points: 85, bonus: 20 },
{ points: 85, bonus: 10 }
]
},
{
_id: 2,
name: "bob",
age: 42,
type: 1,
status: "A",
favorites: { artist: "Miro", food: "meringue" },
finished: [ 11, 25 ],
badges: [ "green" ],
points: [
{ points: 85, bonus: 20 },
{ points: 64, bonus: 12 }
]
},
{
_id: 3,
name: "ahn",
age: 22,
type: 2,
status: "A",
favorites: { artist: "Cassatt", food: "cake" },
finished: [ 6 ],
badges: [ "blue", "red" ],
points: [
{ points: 81, bonus: 8 },
{ points: 55, bonus: 20 }
]
},
{
_id: 4,
name: "xi",
age: 34,
type: 2,
status: "D",
favorites: { artist: "Chagall", food: "chocolate" },
finished: [ 5, 11 ],
badges: [ "red", "black" ],
points: [
{ points: 53, bonus: 15 },
{ points: 51, bonus: 15 }
]
},
{
_id: 5,
name: "xyz",
age: 23,
type: 2,
status: "D",
favorites: { artist: "Noguchi", food: "nougat" },
finished: [ 14, 6 ],
badges: [ "orange" ],
points: [
{ points: 71, bonus: 20 }
]
},
{
_id: 6,
name: "abc",
age: 43,
type: 1,
status: "A",
favorites: { food: "pizza", artist: "Picasso" },
finished: [ 18, 12 ],
badges: [ "black", "blue" ],
points: [
{ points: 78, bonus: 8 },
{ points: 57, bonus: 7 }
]
}
]
)

普通匹配，数组必须从内容及顺序完全相同才可以匹配

def find_array():
d = mongo_db['users'].find(
filter={
"badges": [ "black", "blue" ]
},
)
for a in d:
print(a)

包含匹配

def find_array():
d = mongo_db['users'].find(
filter={
"badges": "black"   #获取 所有数组badges中包含了black的doc
},
)
for a in d:
print(a)

位置匹配

def find_array():
d = mongo_db['users'].find(
filter={
"badges.0": "black"
},
)
for a in d:
print(a)

元素的单个子元素多重条件判断

def find_array():
d = mongo_db['users'].find(
filter={
"finished": {"$elemMatch": {'$gt': 15, '$lt': 20}}   # 任意元素匹配所有条件
},
#projection={
#    'finished': 1
#}
)
for a in d:
print(a)

def find_array():
d = mongo_db['users'].find(
filter={
"finished": {'$gt': 15, '$lt': 20}  # 任意元素匹配其中任意一个条件，不明白这样的道理，在非数组中两个条件是and
},
projection={
'finished': 1
}
)
for a in d:
print(a)

def find_array():
d = mongo_db['users'].find(
filter={
"points.0.points": {'$gt': 50, '$lt': 80}   #第一个元素同时满足两个条件
},
projection={
'points': 1
}
)
for a in d:
print(a)

def find_array():
d = mongo_db['users'].find(
filter={
"points.points": {'$gt': 50, '$lt': 80}   # 任意元素同时满足此条件
},
projection={
'points': 1
}
)
for a in d:
print(a)

元素的多个子元素多重条件判断

def find_array():
d = mongo_db['users'].find(
filter={
"points": {'$elemMatch': {'points': {'$lte': 70}, 'bonus': 20}}   # 任意元素的子元素同时满足条件
},
projection={
'points': 1
}
)
for a in d:
print(a)

def find_array():
d = mongo_db['users'].find(
filter={
"points.points": {'$lte': 70}, "points.bonus": 20   # 所有元素中有可以同时满足条件的子项
},
projection={
'points': 1
}
)
for a in d:
print(a)