【大数据学习笔记】最全Python连接各种数据库及对应的CRUD操作
本文将详细探讨如何在Python中连接全种类数据库以及实现相应的CRUD（创建，读取，更新，删除）操作。我们将逐一解析连接MySQL，SQL Server，Oracle，PostgreSQL，MongoDB，SQLite，DB2，Redis，Cassandra，Microsoft Access，ElasticSearch，Neo4j，InfluxDB，Snowflake，Amazon DynamoDB，Microsoft Azure CosMos DB数据库的方法，并演示相应的CRUD操作。
MySQL
连接数据库
Python可以使用mysql-connector-python库连接MySQL数据库：
import mysql.connector
conn = mysql.connector.connect(user='username', password='password', host='127.0.0.1', database='my_database')
print("Opened MySQL database successfully")
conn.close()CRUD操作
接下来，我们将展示在MySQL中如何进行基本的CRUD操作。
创建（Create）
conn = mysql.connector.connect(user='username', password='password', host='127.0.0.1', database='my_database')
cursor = conn.cursor()
cursor.execute("CREATE TABLE Employees (ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, AGE INT, ADDRESS CHAR(50), SALARY REAL)")
print("Table created successfully")
conn.close()读取（Retrieve）
conn = mysql.connector.connect(user='username', password='password', host='127.0.0.1', database='my_database')
cursor = conn.cursor()
cursor.execute("SELECT id, name, address, salary from Employees")
rows = cursor.fetchall()
for row in rows:
print("ID = ", row[0])
print("NAME = ", row[1])
print("ADDRESS = ", row[2])
print("SALARY = ", row[3])
conn.close()更新（Update）
conn = mysql.connector.connect(user='username', password='password', host='127.0.0.1', database='my_database')
cursor = conn.cursor()
cursor.execute("UPDATE Employees set SALARY = 25000.00 where ID = 1")
conn.commit()
print("Total number of rows updated :", cursor.rowcount)
conn.close()删除（Delete）
conn = mysql.connector.connect(user='username', password='password', host='127.0.0.1', database='my_database')
cursor = conn.cursor()
cursor.execute("DELETE from Employees where ID = 1")
conn.commit()
print("Total number of rows deleted :", cursor.rowcount)
conn.close()SQL Server
连接数据库
Python可以使用pyodbc库连接SQL Server数据库：
import pyodbc
conn = pyodbc.connect('DRIVER={SQL Server};SERVER=localhost;DATABASE=my_database;UID=username;PWD=password')
print("Opened SQL Server database successfully")
conn.close()CRUD操作
接下来，我们将展示在SQL Server中如何进行基本的CRUD操作。
创建（Create）
conn = pyodbc.connect('DRIVER={SQL Server};SERVER=localhost;DATABASE=my_database;UID=username;PWD=password')
cursor = conn.cursor()
cursor.execute("CREATE TABLE Employees (ID INT PRIMARY KEY NOT NULL, NAME VARCHAR(20) NOT NULL, AGE INT, ADDRESS CHAR(50), SALARY REAL)")
conn.commit()
print("Table created successfully")
conn.close()读取（Retrieve）
conn = pyodbc.connect('DRIVER={SQL Server};SERVER=localhost;DATABASE=my_database;UID=username;PWD=password')
cursor = conn.cursor()
cursor.execute("SELECT id, name, address, salary from Employees")
rows = cursor.fetchall()
for row in rows:
print("ID = ", row[0])
print("NAME = ", row[1])
print("ADDRESS = ", row[2])
print("SALARY = ", row[3])
conn.close()更新（Update）
conn = pyodbc.connect('DRIVER={SQL Server};SERVER=localhost;DATABASE=my_database;UID=username;PWD=password')
cursor = conn.cursor()
cursor.execute("UPDATE Employees set SALARY = 25000.00 where ID = 1")
conn.commit()
print("Total number of rows updated :", cursor.rowcount)
conn.close()删除（Delete）
conn = pyodbc.connect('DRIVER={SQL Server};SERVER=localhost;DATABASE=my_database;UID=username;PWD=password')
cursor = conn.cursor()
cursor.execute("DELETE from Employees where ID = 1")
conn.commit()
print("Total number of rows deleted :", cursor.rowcount)
conn.close()Oracle
连接数据库
Python可以使用cx_Oracle库连接Oracle数据库：
import cx_Oracle
dsn_tns = cx_Oracle.makedsn('localhost', '1521', service_name='my_database')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
print("Opened Oracle database successfully")
conn.close()CRUD操作
接下来，我们将展示在Oracle中如何进行基本的CRUD操作。
创建（Create）
dsn_tns = cx_Oracle.makedsn('localhost', '1521', service_name='my_database')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
cursor = conn.cursor()
cursor.execute("CREATE TABLE Employees (ID NUMBER(10) NOT NULL PRIMARY KEY, NAME VARCHAR2(20) NOT NULL, AGE NUMBER(3), ADDRESS CHAR(50), SALARY NUMBER(10, 2))")
conn.commit()
print("Table created successfully")
conn.close()读取（Retrieve）
dsn_tns = cx_Oracle.makedsn('localhost', '1521', service_name='my_database')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
cursor = conn.cursor()
cursor.execute("SELECT id, name, address, salary from Employees")
rows = cursor.fetchall()
for row in rows:
print("ID = ", row[0])
print("NAME = ", row[1])
print("ADDRESS = ", row[2])
print("SALARY = ", row[3])
conn.close()更新（Update）
dsn_tns = cx_Oracle.makedsn('localhost', '1521', service_name='my_database')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
cursor = conn.cursor()
cursor.execute("UPDATE Employees set SALARY = 25000.00 where ID = 1")
conn.commit()
print("Total number of rows updated :", cursor.rowcount)
conn.close()删除（Delete）
dsn_tns = cx_Oracle.makedsn('localhost', '1521', service_name='my_database')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
cursor = conn.cursor()
cursor.execute("DELETE from Employees where ID = 1")
conn.commit()
print("Total number of rows deleted :", cursor.rowcount)
conn.close()PostgreSQL
连接数据库
Python可以使用psycopg2库连接PostgreSQL数据库：
import psycopg2
conn = psycopg2.connect(database="my_database", user="username", password="password", host="127.0.0.1", port="5432")
print("Opened PostgreSQL database successfully")
conn.close()CRUD操作
接下来，我们将展示在PostgreSQL中如何进行基本的CRUD操作。
创建（Create）
conn = psycopg2.connect(database="my_database", user="username", password="password", host="127.0.0.1", port="5432")
cursor = conn.cursor()
cursor.execute('''CREATE TABLE Employees
(ID INT PRIMARY KEY NOT NULL,
NAME TEXT NOT NULL,
AGE INT NOT NULL,
ADDRESS CHAR(50),
SALARY REAL);''')
conn.commit()
print("Table created successfully")
conn.close()读取（Retrieve）
conn = psycopg2.connect(database="my_database", user="username", password="password", host="127.0.0.1", port="5432")
cursor = conn.cursor()
cursor.execute("SELECT id, name, address, salary from Employees")
rows = cursor.fetchall()
for row in rows:
print("ID = ", row[0])
print("NAME = ", row[1])
print("ADDRESS = ", row[2])
print("SALARY = ", row[3])
conn.close()更新（Update）
conn = psycopg2.connect(database="my_database", user="username", password="password", host="127.0.0.1", port="5432")
cursor = conn.cursor()
cursor.execute("UPDATE Employees set SALARY = 25000.00 where ID = 1")
conn.commit()
print("Total number of rows updated :", cursor.rowcount)
conn.close()删除（Delete）
conn = psycopg2.connect(database="my_database", user="username", password="password", host="127.0.0.1", port="5432")
cursor = conn.cursor()
cursor.execute("DELETE from Employees where ID = 1")
conn.commit()
print("Total number of rows deleted :", cursor.rowcount)
conn.close()MongoDB
连接数据库
Python可以使用pymongo库连接MongoDB数据库：
from pymongo import MongoClient
client = MongoClient("mongodb://localhost:27017/")
db = client["my_database"]
print("Opened MongoDB database successfully")
client.close()CRUD操作
接下来，我们将展示在MongoDB中如何进行基本的CRUD操作。
创建（Create）
在MongoDB中，文档的创建操作通常包含在插入操作中：
client = MongoClient("mongodb://localhost:27017/")
db = client["my_database"]
employees = db["Employees"]
employee = {"id": "1", "name": "John", "age": "30", "address": "New York", "salary": "1000.00"}
employees.insert_one(employee)
print("Document inserted successfully")
client.close()读取（Retrieve）
client = MongoClient("mongodb://localhost:27017/")
db = client["my_database"]
employees = db["Employees"]
cursor = employees.find()
for document in cursor:
print(document)
client.close()更新（Update）
client = MongoClient("mongodb://localhost:27017/")
db = client["my_database"]
employees = db["Employees"]
query = { "id": "1" }
new_values = { "$set": { "salary": "25000.00" } }
employees.update_one(query, new_values)
print("Document updated successfully")
client.close()删除（Delete）
client = MongoClient("mongodb://localhost:27017/")
db = client["my_database"]
employees = db["Employees"]
query = { "id": "1" }
employees.delete_one(query)
print("Document deleted successfully")
client.close()SQLite
连接数据库
Python使用sqlite3库连接SQLite数据库：
import sqlite3
conn = sqlite3.connect('my_database.db')
print("Opened SQLite database successfully")
conn.close()CRUD操作
接下来，我们将展示在SQLite中如何进行基本的CRUD操作。
创建（Create）
conn = sqlite3.connect('my_database.db')
cursor = conn.cursor()
cursor.execute('''CREATE TABLE Employees
(ID INT PRIMARY KEY NOT NULL,
NAME TEXT NOT NULL,
AGE INT NOT NULL,
ADDRESS CHAR(50),
SALARY REAL);''')
conn.commit()
print("Table created successfully")
conn.close()读取（Retrieve）
conn = sqlite3.connect('my_database.db')
cursor = conn.cursor()
cursor.execute("SELECT id, name, address, salary from Employees")
rows = cursor.fetchall()
for row in rows:
print("ID = ", row[0])
print("NAME = ", row[1])
print("ADDRESS = ", row[2])
print("SALARY = ", row[3])
conn.close()更新（Update）
conn = sqlite3.connect('my_database.db')
cursor = conn.cursor()
cursor.execute("UPDATE Employees set SALARY = 25000.00 where ID = 1")
conn.commit()
print("Total number of rows updated :", cursor.rowcount)
conn.close()删除（Delete）
conn = sqlite3.connect('my_database.db')
cursor = conn.cursor()
cursor.execute("DELETE from Employees where ID = 1")
conn.commit()
print("Total number of rows deleted :", cursor.rowcount)
conn.close()DB2
连接数据库
Python可以使用ibm_db库连接DB2数据库：
import ibm_db
dsn = (
"DRIVER={{IBM DB2 ODBC DRIVER}};"
"DATABASE=my_database;"
"HOSTNAME=127.0.0.1;"
"PORT=50000;"
"PROTOCOL=TCPIP;"
"UID=username;"
"PWD=password;"
)
conn = ibm_db.connect(dsn, "", "")
print("Opened DB2 database successfully")
ibm_db.close(conn)CRUD操作
接下来，我们将展示在DB2中如何进行基本的CRUD操作。
创建（Create）
conn = ibm_db.connect(dsn, "", "")
sql = '''CREATE TABLE Employees
(ID INT PRIMARY KEY NOT NULL,
NAME VARCHAR(20) NOT NULL,
AGE INT NOT NULL,
ADDRESS CHAR(50),
SALARY DECIMAL(9, 2));'''
stmt = ibm_db.exec_immediate(conn, sql)
print("Table created successfully")
ibm_db.close(conn)读取（Retrieve）
conn = ibm_db.connect(dsn, "", "")
sql = "SELECT id, name, address, salary from Employees"
stmt = ibm_db.exec_immediate(conn, sql)
while ibm_db.fetch_row(stmt):
print("ID = ", ibm_db.result(stmt, "ID"))
print("NAME = ", ibm_db.result(stmt, "NAME"))
print("ADDRESS = ", ibm_db.result(stmt, "ADDRESS"))
print("SALARY = ", ibm_db.result(stmt, "SALARY"))
ibm_db.close(conn)更新（Update）
conn = ibm_db.connect(dsn, "", "")
sql = "UPDATE Employees set SALARY = 25000.00 where ID = 1"
stmt = ibm_db.exec_immediate(conn, sql)
ibm_db.commit(conn)
print("Total number of rows updated :", ibm_db.num_rows(stmt))
ibm_db.close(conn)删除（Delete）
conn = ibm_db.connect(dsn, "", "")
sql = "DELETE from Employees where ID = 1"
stmt = ibm_db.exec_immediate(conn, sql)
ibm_db.commit(conn)
print("Total number of rows deleted :", ibm_db.num_rows(stmt))
ibm_db.close(conn)Microsoft Access
连接数据库
Python可以使用pyodbc库连接Microsoft Access数据库：
import pyodbc
conn_str = (
r'DRIVER={Microsoft Access Driver (*.mdb, *.accdb)};'
r'DBQ=path_to_your_access_file.accdb;'
)
conn = pyodbc.connect(conn_str)
print("Opened Access database successfully")
conn.close()CRUD操作
接下来，我们将展示在Access中如何进行基本的CRUD操作。
创建（Create）
conn = pyodbc.connect(conn_str)
cursor = conn.cursor()
cursor.execute('''CREATE TABLE Employees
(ID INT PRIMARY KEY NOT NULL,
NAME TEXT NOT NULL,
AGE INT NOT NULL,
ADDRESS CHAR(50),
SALARY DECIMAL(9, 2));''')
conn.commit()
print("Table created successfully")
conn.close()读取（Retrieve）
conn = pyodbc.connect(conn_str)
cursor = conn.cursor()
cursor.execute("SELECT id, name, address, salary from Employees")
rows = cursor.fetchall()
for row in rows:
print("ID = ", row[0])
print("NAME = ", row[1])
print("ADDRESS = ", row[2])
print("SALARY = ", row[3])
conn.close()更新（Update）
conn = pyodbc.connect(conn_str)
cursor = conn.cursor()
cursor.execute("UPDATE Employees set SALARY = 25000.00 where ID = 1")
conn.commit()
print("Total number of rows updated :", cursor.rowcount)
conn.close()删除（Delete）
conn = pyodbc.connect(conn_str)
cursor = conn.cursor()
cursor.execute("DELETE from Employees where ID = 1")
conn.commit()
print("Total number of rows deleted :", cursor.rowcount)
conn.close()Cassandra
连接数据库
Python可以使用cassandra-driver库连接Cassandra数据库：
from cassandra.cluster import Cluster
cluster = Cluster(['127.0.0.1'])
session = cluster.connect('my_keyspace')
print("Opened Cassandra database successfully")
cluster.shutdown()CRUD操作
接下来，我们将展示在Cassandra中如何进行基本的CRUD操作。
创建（Create）
cluster = Cluster(['127.0.0.1'])
session = cluster.connect('my_keyspace')
session.execute("""
CREATE TABLE Employees (
id int PRIMARY KEY,
name text,
age int,
address text,
salary decimal
)
""")
print("Table created successfully")
cluster.shutdown()读取（Retrieve）
cluster = Cluster(['127.0.0.1'])
session = cluster.connect('my_keyspace')
rows = session.execute('SELECT id, name, address, salary FROM Employees')
for row in rows:
print("ID = ", row.id)
print("NAME = ", row.name)
print("ADDRESS = ", row.address)
print("SALARY = ", row.salary)
cluster.shutdown()更新（Update）
cluster = Cluster(['127.0.0.1'])
session = cluster.connect('my_keyspace')
session.execute("UPDATE Employees SET salary = 25000.00 WHERE id = 1")
print("Row updated successfully")
cluster.shutdown()删除（Delete）
cluster = Cluster(['127.0.0.1'])
session = cluster.connect('my_keyspace')
session.execute("DELETE FROM Employees WHERE id = 1")
print("Row deleted successfully")
cluster.shutdown()Redis
连接数据库
Python可以使用redis-py库连接Redis数据库：
import redis
r = redis.Redis(host='localhost', port=6379, db=0)
print("Opened Redis database successfully")CRUD操作
接下来，我们将展示在Redis中如何进行基本的CRUD操作。
创建（Create）
r = redis.Redis(host='localhost', port=6379, db=0)
r.set('employee:1:name', 'John')
r.set('employee:1:age', '30')
r.set('employee:1:address', 'New York')
r.set('employee:1:salary', '1000.00')
print("Keys created successfully")读取（Retrieve）
r = redis.Redis(host='localhost', port=6379, db=0)
print("NAME = ", r.get('employee:1:name').decode('utf-8'))
print("AGE = ", r.get('employee:1:age').decode('utf-8'))
print("ADDRESS = ", r.get('employee:1:address').decode('utf-8'))
print("SALARY = ", r.get('employee:1:salary').decode('utf-8'))更新（Update）
r = redis.Redis(host='localhost', port=6379, db=0)
r.set('employee:1:salary', '25000.00')
print("Key updated successfully")删除（Delete）
r = redis.Redis(host='localhost', port=6379, db=0)
r.delete('employee:1:name', 'employee:1:age', 'employee:1:address', 'employee:1:salary')
print("Keys deleted successfully")ElasticSearch
连接数据库
Python可以使用elasticsearch库连接ElasticSearch数据库：
from elasticsearch import Elasticsearch
es = Elasticsearch([{'host': 'localhost', 'port': 9200}])
print("Opened ElasticSearch database successfully")CRUD操作
接下来，我们将展示在ElasticSearch中如何进行基本的CRUD操作。
创建（Create）
es = Elasticsearch([{'host': 'localhost', 'port': 9200}])
employee = {
'name': 'John',
'age': 30,
'address': 'New York',
'salary': 1000.00
}
res = es.index(index='employees', doc_type='employee', id=1, body=employee)
print("Document created successfully")读取（Retrieve）
es = Elasticsearch([{'host': 'localhost', 'port': 9200}])
res = es.get(index='employees', doc_type='employee', id=1)
print("Document details:")
for field, details in res['_source'].items():
print(f"{field.upper()} = ", details)更新（Update）
es = Elasticsearch([{'host': 'localhost', 'port': 9200}])
res = es.update(index='employees', doc_type='employee', id=1, body={
'doc': {
'salary': 25000.00
}
})
print("Document updated successfully")删除（Delete）
es = Elasticsearch([{'host': 'localhost', 'port': 9200}])
res = es.delete(index='employees', doc_type='employee', id=1)
print("Document deleted successfully")Neo4j
连接数据库
Python可以使用neo4j库连接Neo4j数据库：
from neo4j import GraphDatabase
driver = GraphDatabase.driver("bolt://localhost:7687", auth=("neo4j", "password"))
print("Opened Neo4j database successfully")
driver.close()CRUD操作
接下来，我们将展示在Neo4j中如何进行基本的CRUD操作。
创建（Create）
driver = GraphDatabase.driver("bolt://localhost:7687", auth=("neo4j", "password"))
with driver.session() as session:
session.run("CREATE (:Employee {id: 1, name: 'John', age: 30, address: 'New York', salary: 1000.00})")
print("Node created successfully")
driver.close()读取（Retrieve）
driver = GraphDatabase.driver("bolt://localhost:7687", auth=("neo4j", "password"))
with driver.session() as session:
result = session.run("MATCH (n:Employee) WHERE n.id = 1 RETURN n")
for record in result:
print("ID = ", record["n"]["id"])
print("NAME = ", record["n"]["name"])
print("ADDRESS = ", record["n"]["address"])
print("SALARY = ", record["n"]["salary"])
driver.close()更新（Update）
driver = GraphDatabase.driver("bolt://localhost:7687", auth=("neo4j", "password"))
with driver.session() as session:
session.run("MATCH (n:Employee) WHERE n.id = 1 SET n.salary = 25000.00")
print("Node updated successfully")
driver.close()删除（Delete）
driver = GraphDatabase.driver("bolt://localhost:7687", auth=("neo4j", "password"))
with driver.session() as session:
session.run("MATCH (n:Employee) WHERE n.id = 1 DETACH DELETE n")
print("Node deleted successfully")
driver.close()InfluxDB
连接数据库
Python可以使用InfluxDB-Python库连接InfluxDB数据库：
from influxdb import InfluxDBClient
client = InfluxDBClient(host='localhost', port=8086)
print("Opened InfluxDB database successfully")
client.close()CRUD操作
接下来，我们将展示在InfluxDB中如何进行基本的CRUD操作。
创建（Create）
client = InfluxDBClient(host='localhost', port=8086)
json_body = [
{
"measurement": "employees",
"tags": {
"id": "1"
},
"fields": {
"name": "John",
"age": 30,
"address": "New York",
"salary": 1000.00
}
}
]
client.write_points(json_body)
print("Point created successfully")
client.close()读取（Retrieve）
client = InfluxDBClient(host='localhost', port=8086)
result = client.query('SELECT "name", "age", "address", "salary" FROM "employees"')
for point in result.get_points():
print("ID = ", point['id'])
print("NAME = ", point['name'])
print("AGE = ", point['age'])
print("ADDRESS = ", point['address'])
print("SALARY = ", point['salary'])
client.close()更新（Update）
InfluxDB的数据模型和其他数据库不同，它没有更新操作。但是你可以通过写入一个相同的数据点（即具有相同的时间戳和标签）并改变字段值，实现类似更新操作的效果。
删除（Delete）
同样，InfluxDB也没有提供删除单个数据点的操作。然而，你可以删除整个系列（即表）或者删除某个时间段的数据。
client = InfluxDBClient(host='localhost', port=8086)
# 删除整个系列
client.query('DROP SERIES FROM "employees"')
# 删除某个时间段的数据
# client.query('DELETE FROM "employees" WHERE time < now() - 1d')
print("Series deleted successfully")
client.close()Snowflake
连接数据库
Python可以使用snowflake-connector-python库连接Snowflake数据库：
from snowflake.connector import connect
con = connect(
user='username',
password='password',
account='account_url',
warehouse='warehouse',
database='database',
schema='schema'
)
print("Opened Snowflake database successfully")
con.close()CRUD操作
接下来，我们将展示在Snowflake中如何进行基本的CRUD操作。
创建（Create）
con = connect(
user='username',
password='password',
account='account_url',
warehouse='warehouse',
database='database',
schema='schema'
)
cur = con.cursor()
cur.execute("""
CREATE TABLE EMPLOYEES (
ID INT,
NAME STRING,
AGE INT,
ADDRESS STRING,
SALARY FLOAT
)
""")
cur.execute("""
INSERT INTO EMPLOYEES (ID, NAME, AGE, ADDRESS, SALARY) VALUES
(1, 'John', 30, 'New York', 1000.00)
""")
print("Table created and row inserted successfully")
con.close()读取（Retrieve）
con = connect(
user='username',
password='password',
account='account_url',
warehouse='warehouse',
database='database',
schema='schema'
)
cur = con.cursor()
cur.execute("SELECT * FROM EMPLOYEES WHERE ID = 1")
rows = cur.fetchall()
for row in rows:
print("ID = ", row[0])
print("NAME = ", row[1])
print("AGE = ", row[2])
print("ADDRESS = ", row[3])
print("SALARY = ", row[4])
con.close()更新（Update）
con = connect(
user='username',
password='password',
account='account_url',
warehouse='warehouse',
database='database',
schema='schema'
)
cur = con.cursor()
cur.execute("UPDATE EMPLOYEES SET SALARY = 25000.00 WHERE ID = 1")
print("Row updated successfully")
con.close()删除（Delete）
con = connect(
user='username',
password='password',
account='account_url',
warehouse='warehouse',
database='database',
schema='schema'
)
cur = con.cursor()
cur.execute("DELETE FROM EMPLOYEES WHERE ID = 1")
print("Row deleted successfully")
con.close()Amazon DynamoDB
连接数据库
Python可以使用boto3库连接Amazon DynamoDB：
import boto3
dynamodb = boto3.resource('dynamodb', region_name='us-west-2',
aws_access_key_id='Your AWS Access Key',
aws_secret_access_key='Your AWS Secret Key')
print("Opened DynamoDB successfully")CRUD操作
接下来，我们将展示在DynamoDB中如何进行基本的CRUD操作。
创建（Create）
table = dynamodb.create_table(
TableName='Employees',
KeySchema=[
{
'AttributeName': 'id',
'KeyType': 'HASH'
},
],
AttributeDefinitions=[
{
'AttributeName': 'id',
'AttributeType': 'N'
},
],
ProvisionedThroughput={
'ReadCapacityUnits': 5,
'WriteCapacityUnits': 5
}
)
table.put_item(
Item={
'id': 1,
'name': 'John',
'age': 30,
'address': 'New York',
'salary': 1000.00
}
)
print("Table created and item inserted successfully")读取（Retrieve）
table = dynamodb.Table('Employees')
response = table.get_item(
Key={
'id': 1,
}
)
item = response['Item']
print(item)更新（Update）
table = dynamodb.Table('Employees')
table.update_item(
Key={
'id': 1,
},
UpdateExpression='SET salary = :val1',
ExpressionAttributeValues={
':val1': 25000.00
}
)
print("Item updated successfully")删除（Delete）
table = dynamodb.Table('Employees')
table.delete_item(
Key={
'id': 1,
}
)
print("Item deleted successfully")Microsoft Azure CosMos DB
连接数据库
Python可以使用azure-cosmos库连接Microsoft Azure CosMos DB：
from azure.cosmos import CosmosClient, PartitionKey, exceptions
url = 'Cosmos DB Account URL'
key = 'Cosmos DB Account Key'
client = CosmosClient(url, credential=key)
database_name = 'testDB'
database = client.get_database_client(database_name)
container_name = 'Employees'
container = database.get_container_client(container_name)
print("Opened CosMos DB successfully")CRUD操作
接下来，我们将展示在CosMos DB中如何进行基本的CRUD操作。
创建（Create）
database = client.create_database_if_not_exists(id=database_name)
container = database.create_container_if_not_exists(
id=container_name,
partition_key=PartitionKey(path="/id"),
offer_throughput=400
)
container.upsert_item({
'id': '1',
'name': 'John',
'age': 30,
'address': 'New York',
'salary': 1000.00
})
print("Container created and item upserted successfully")读取（Retrieve）
for item in container.read_all_items():
print(item)更新（Update）
for item in container.read_all_items():
if item['id'] == '1':
item['salary'] = 25000.00
container.upsert_item(item)
print("Item updated successfully")删除（Delete）
for item in container.read_all_items():
if item['id'] == '1':
container.delete_item(item, partition_key='1')
print("Item d