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Python史上最全种类数据库操作方法,你能想到的数据库类型都在!

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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.connectorconn = 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 pyodbcconn = 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_Oracledsn_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 psycopg2conn = 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 MongoClientclient = 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 sqlite3conn = 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_dbdsn = (    "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 pyodbcconn_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 Clustercluster = 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 redisr = 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 Elasticsearches = 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 GraphDatabasedriver = 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 InfluxDBClientclient = 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 connectcon = 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 boto3dynamodb = 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, exceptionsurl = '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 deleted successfully")

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