Python 重复密钥错误集合：mydatabase.customers索引：\u id\u重复密钥

我想检查用户是否存在。如果用户确实存在，请不要插入它

这是我的代码：

#!/usr/bin/env python
# Python code to illustrate
# inserting data in MongoDB
from pymongo import MongoClient

try:
    myclient  = MongoClient('10.1.3.18',27017)
    print("Connected successfully!!!")
except:
    print("Could not connect to MongoDB")

# database
emp_rec1 = {
        "name":"Mr.Geek1",
        "eid":24,
        "location":"delhi"
        }
emp_rec2 = {
        "name":"Mr.Shaurya",
        "eid":14,
        "location":"delhi"
        }

emp_rec3 = {
        "name":"Mr.Shaurya111",
        "eid":141111,
        "location":"delhi111111"
        }
a=[emp_rec1,emp_rec2,emp_rec3]
mydb = myclient["mydatabase"]
#result = mydb.profiles.create_index([('user_id'],unique=True)
mycol = mydb["customers"]

#x = mycol.insert_one(a[2])
cursor = mycol.find()
for record in cursor:
    print(record)
    mydb.servers.getIndexes()
    if record['name']!="Mr.Shaurya":
        x = mycol.insert_one(a[0])
        print(record)

pymongo.errors.DuplicateKeyError: E11000 duplicate key error collection: 
mydatabase.customers index: _id_ dup key: { :ObjectId('5d7b9a6bc9a8569a44a6da2c') }

#!/usr/bin/env python
# Python code to illustrate
# inserting data in MongoDB
from pymongo import MongoClient

try:
    myclient  = MongoClient('10.1.3.18',27017)
    print("Connected successfully!!!")
except:
    print("Could not connect to MongoDB")

# database
emp_rec1 = {
        "name":"Mr.Geek1",
        "eid":24,
        "location":"delhi"
        }
emp_rec2 = {
        "name":"Mr.Shaurya",
        "eid":14,
        "location":"delhi"
        }

emp_rec3 = {
        "name":"Mr.Shaurya111",
        "eid":141111,
        "location":"delhi111111"
        }
a=[emp_rec1,emp_rec2,emp_rec3]
mydb = myclient["mydatabase"]
#result = mydb.profiles.create_index([('user_id'],unique=True)
mycol = mydb["customers"]

#x = mycol.insert_one(a[2])
cursor = mycol.find()
for record in cursor:
    print(record)
    mydb.servers.getIndexes()

    for i in a:
         if record['eid'] != i['eid']:
              x = mycol.insert_one(a[0])
              print(record)

#!/usr/bin/env python
# Python code to illustrate
# inserting data in MongoDB
from pymongo import MongoClient

try:
    myclient  = MongoClient('10.1.3.18',27017)
    print("Connected successfully!!!")
except:
    print("Could not connect to MongoDB")

# database
emp_rec1 = {
        "name":"Mr.Geek1",
        "eid":24,
        "location":"delhi"
        }
emp_rec2 = {
        "name":"Mr.Shaurya",
        "eid":14,
        "location":"delhi"
        }

emp_rec3 = {
        "name":"Mr.Shaurya111",
        "eid":141111,
        "location":"delhi111111"
        }
a=[emp_rec1,emp_rec2,emp_rec3]
mydb = myclient["mydatabase"]
#result = mydb.profiles.create_index([('user_id'],unique=True)
mycol = mydb["customers"]

#x = mycol.insert_one(a[2])
cursor = mycol.find()
for record in cursor:
    print(record)
    mydb.servers.getIndexes()

    for i in a:
         if record['name'] != i['name']:
              x = mycol.insert_one(a[0])
              print(record)

这个代码正确吗？还是有其他解决办法

如果我运行代码两次，就会出现以下错误：

#!/usr/bin/env python
# Python code to illustrate
# inserting data in MongoDB
from pymongo import MongoClient

try:
    myclient  = MongoClient('10.1.3.18',27017)
    print("Connected successfully!!!")
except:
    print("Could not connect to MongoDB")

# database
emp_rec1 = {
        "name":"Mr.Geek1",
        "eid":24,
        "location":"delhi"
        }
emp_rec2 = {
        "name":"Mr.Shaurya",
        "eid":14,
        "location":"delhi"
        }

emp_rec3 = {
        "name":"Mr.Shaurya111",
        "eid":141111,
        "location":"delhi111111"
        }
a=[emp_rec1,emp_rec2,emp_rec3]
mydb = myclient["mydatabase"]
#result = mydb.profiles.create_index([('user_id'],unique=True)
mycol = mydb["customers"]

#x = mycol.insert_one(a[2])
cursor = mycol.find()
for record in cursor:
    print(record)
    mydb.servers.getIndexes()
    if record['name']!="Mr.Shaurya":
        x = mycol.insert_one(a[0])
        print(record)

pymongo.errors.DuplicateKeyError: E11000 duplicate key error collection: 
mydatabase.customers index: _id_ dup key: { :ObjectId('5d7b9a6bc9a8569a44a6da2c') }

#!/usr/bin/env python
# Python code to illustrate
# inserting data in MongoDB
from pymongo import MongoClient

try:
    myclient  = MongoClient('10.1.3.18',27017)
    print("Connected successfully!!!")
except:
    print("Could not connect to MongoDB")

# database
emp_rec1 = {
        "name":"Mr.Geek1",
        "eid":24,
        "location":"delhi"
        }
emp_rec2 = {
        "name":"Mr.Shaurya",
        "eid":14,
        "location":"delhi"
        }

emp_rec3 = {
        "name":"Mr.Shaurya111",
        "eid":141111,
        "location":"delhi111111"
        }
a=[emp_rec1,emp_rec2,emp_rec3]
mydb = myclient["mydatabase"]
#result = mydb.profiles.create_index([('user_id'],unique=True)
mycol = mydb["customers"]

#x = mycol.insert_one(a[2])
cursor = mycol.find()
for record in cursor:
    print(record)
    mydb.servers.getIndexes()

    for i in a:
         if record['eid'] != i['eid']:
              x = mycol.insert_one(a[0])
              print(record)

#!/usr/bin/env python
# Python code to illustrate
# inserting data in MongoDB
from pymongo import MongoClient

try:
    myclient  = MongoClient('10.1.3.18',27017)
    print("Connected successfully!!!")
except:
    print("Could not connect to MongoDB")

# database
emp_rec1 = {
        "name":"Mr.Geek1",
        "eid":24,
        "location":"delhi"
        }
emp_rec2 = {
        "name":"Mr.Shaurya",
        "eid":14,
        "location":"delhi"
        }

emp_rec3 = {
        "name":"Mr.Shaurya111",
        "eid":141111,
        "location":"delhi111111"
        }
a=[emp_rec1,emp_rec2,emp_rec3]
mydb = myclient["mydatabase"]
#result = mydb.profiles.create_index([('user_id'],unique=True)
mycol = mydb["customers"]

#x = mycol.insert_one(a[2])
cursor = mycol.find()
for record in cursor:
    print(record)
    mydb.servers.getIndexes()

    for i in a:
         if record['name'] != i['name']:
              x = mycol.insert_one(a[0])
              print(record)

MongoDB中如何防止重复密钥？

---

如何使用索引？

假设

eid

是导致重复键错误的主键列，下面的代码应该可以解决您的问题

当您在

游标

中循环时，您还希望在数组

a

中循环，并查看a中的

eid

是否也存在于数据库

游标

中。如果不存在，则将使用

x=mycl.insert\u one（a[0]）

代码：

#!/usr/bin/env python
# Python code to illustrate
# inserting data in MongoDB
from pymongo import MongoClient

try:
    myclient  = MongoClient('10.1.3.18',27017)
    print("Connected successfully!!!")
except:
    print("Could not connect to MongoDB")

# database
emp_rec1 = {
        "name":"Mr.Geek1",
        "eid":24,
        "location":"delhi"
        }
emp_rec2 = {
        "name":"Mr.Shaurya",
        "eid":14,
        "location":"delhi"
        }

emp_rec3 = {
        "name":"Mr.Shaurya111",
        "eid":141111,
        "location":"delhi111111"
        }
a=[emp_rec1,emp_rec2,emp_rec3]
mydb = myclient["mydatabase"]
#result = mydb.profiles.create_index([('user_id'],unique=True)
mycol = mydb["customers"]

#x = mycol.insert_one(a[2])
cursor = mycol.find()
for record in cursor:
    print(record)
    mydb.servers.getIndexes()
    if record['name']!="Mr.Shaurya":
        x = mycol.insert_one(a[0])
        print(record)

pymongo.errors.DuplicateKeyError: E11000 duplicate key error collection: 
mydatabase.customers index: _id_ dup key: { :ObjectId('5d7b9a6bc9a8569a44a6da2c') }

#!/usr/bin/env python
# Python code to illustrate
# inserting data in MongoDB
from pymongo import MongoClient

try:
    myclient  = MongoClient('10.1.3.18',27017)
    print("Connected successfully!!!")
except:
    print("Could not connect to MongoDB")

# database
emp_rec1 = {
        "name":"Mr.Geek1",
        "eid":24,
        "location":"delhi"
        }
emp_rec2 = {
        "name":"Mr.Shaurya",
        "eid":14,
        "location":"delhi"
        }

emp_rec3 = {
        "name":"Mr.Shaurya111",
        "eid":141111,
        "location":"delhi111111"
        }
a=[emp_rec1,emp_rec2,emp_rec3]
mydb = myclient["mydatabase"]
#result = mydb.profiles.create_index([('user_id'],unique=True)
mycol = mydb["customers"]

#x = mycol.insert_one(a[2])
cursor = mycol.find()
for record in cursor:
    print(record)
    mydb.servers.getIndexes()

    for i in a:
         if record['eid'] != i['eid']:
              x = mycol.insert_one(a[0])
              print(record)

#!/usr/bin/env python
# Python code to illustrate
# inserting data in MongoDB
from pymongo import MongoClient

try:
    myclient  = MongoClient('10.1.3.18',27017)
    print("Connected successfully!!!")
except:
    print("Could not connect to MongoDB")

# database
emp_rec1 = {
        "name":"Mr.Geek1",
        "eid":24,
        "location":"delhi"
        }
emp_rec2 = {
        "name":"Mr.Shaurya",
        "eid":14,
        "location":"delhi"
        }

emp_rec3 = {
        "name":"Mr.Shaurya111",
        "eid":141111,
        "location":"delhi111111"
        }
a=[emp_rec1,emp_rec2,emp_rec3]
mydb = myclient["mydatabase"]
#result = mydb.profiles.create_index([('user_id'],unique=True)
mycol = mydb["customers"]

#x = mycol.insert_one(a[2])
cursor = mycol.find()
for record in cursor:
    print(record)
    mydb.servers.getIndexes()

    for i in a:
         if record['name'] != i['name']:
              x = mycol.insert_one(a[0])
              print(record)

如果要严格检查

customers

表中的用户名，可以使用以下查询

代码：

#!/usr/bin/env python
# Python code to illustrate
# inserting data in MongoDB
from pymongo import MongoClient

try:
    myclient  = MongoClient('10.1.3.18',27017)
    print("Connected successfully!!!")
except:
    print("Could not connect to MongoDB")

# database
emp_rec1 = {
        "name":"Mr.Geek1",
        "eid":24,
        "location":"delhi"
        }
emp_rec2 = {
        "name":"Mr.Shaurya",
        "eid":14,
        "location":"delhi"
        }

emp_rec3 = {
        "name":"Mr.Shaurya111",
        "eid":141111,
        "location":"delhi111111"
        }
a=[emp_rec1,emp_rec2,emp_rec3]
mydb = myclient["mydatabase"]
#result = mydb.profiles.create_index([('user_id'],unique=True)
mycol = mydb["customers"]

#x = mycol.insert_one(a[2])
cursor = mycol.find()
for record in cursor:
    print(record)
    mydb.servers.getIndexes()
    if record['name']!="Mr.Shaurya":
        x = mycol.insert_one(a[0])
        print(record)

pymongo.errors.DuplicateKeyError: E11000 duplicate key error collection: 
mydatabase.customers index: _id_ dup key: { :ObjectId('5d7b9a6bc9a8569a44a6da2c') }

#!/usr/bin/env python
# Python code to illustrate
# inserting data in MongoDB
from pymongo import MongoClient

try:
    myclient  = MongoClient('10.1.3.18',27017)
    print("Connected successfully!!!")
except:
    print("Could not connect to MongoDB")

# database
emp_rec1 = {
        "name":"Mr.Geek1",
        "eid":24,
        "location":"delhi"
        }
emp_rec2 = {
        "name":"Mr.Shaurya",
        "eid":14,
        "location":"delhi"
        }

emp_rec3 = {
        "name":"Mr.Shaurya111",
        "eid":141111,
        "location":"delhi111111"
        }
a=[emp_rec1,emp_rec2,emp_rec3]
mydb = myclient["mydatabase"]
#result = mydb.profiles.create_index([('user_id'],unique=True)
mycol = mydb["customers"]

#x = mycol.insert_one(a[2])
cursor = mycol.find()
for record in cursor:
    print(record)
    mydb.servers.getIndexes()

    for i in a:
         if record['eid'] != i['eid']:
              x = mycol.insert_one(a[0])
              print(record)

#!/usr/bin/env python
# Python code to illustrate
# inserting data in MongoDB
from pymongo import MongoClient

try:
    myclient  = MongoClient('10.1.3.18',27017)
    print("Connected successfully!!!")
except:
    print("Could not connect to MongoDB")

# database
emp_rec1 = {
        "name":"Mr.Geek1",
        "eid":24,
        "location":"delhi"
        }
emp_rec2 = {
        "name":"Mr.Shaurya",
        "eid":14,
        "location":"delhi"
        }

emp_rec3 = {
        "name":"Mr.Shaurya111",
        "eid":141111,
        "location":"delhi111111"
        }
a=[emp_rec1,emp_rec2,emp_rec3]
mydb = myclient["mydatabase"]
#result = mydb.profiles.create_index([('user_id'],unique=True)
mycol = mydb["customers"]

#x = mycol.insert_one(a[2])
cursor = mycol.find()
for record in cursor:
    print(record)
    mydb.servers.getIndexes()

    for i in a:
         if record['name'] != i['name']:
              x = mycol.insert_one(a[0])
              print(record)

---

您是否有使用mydb.servers.getIndexes（）的

SQLInsert