I have a code (class Server). I need help to fix error in another class. These are 2 seperated files. import socket import pandas as pd import sqlite3 class Server: def __init__(self, portnumber): self.port = portnumber self.s = socket.socket() self.host = socket.gethostname() self.s.bind((self.host, self.port)) self.s.listen(5) print('Server listening....') def __enter__(self): return self def __exit__(self, exc_type, exc_val, exc_tb): self.close() def serve(self): while True: conn, addr = self.s.accept() print('Got connection from', addr) query = conn.recv(1024).decode() print('Server received query:', query) # Process the SQL query and retrieve data data = self.process_query(query) # Send the data back to the client conn.sendall(data.to_msgpack()) print('Sent data:', data) conn.close() def process_query(self, query): # Connect to the SQLDatabase and execute the query connection = sqlite3.connect('data.db') data = pd.read_sql_query(query, connection) connection.close() return data def close(self): self.s.close() # Run the server with Server(5000) as server: server.serve() _______________________________ # Y Nhi Tran # Exercise Client import socket import pickle class Client: def __init__(self, portnumber): self.port = portnumber self.s = socket.socket() self.host = socket.gethostname() def connect(self): self.s.connect((self.host, self.port)) def send_query(self, query): self.s.send(query.encode()) def receive_dataframe(self): # Receive the data size size_data = b"" while len(size_data) < 4: chunk = self.s.recv(4 - len(size_data)) if not chunk: break size_data += chunk data_size = int.from_bytes(size_data, "big") # Receive the data data = b"" while len(data) < data_size: chunk = self.s.recv(min(data_size - len(data), 4096)) if not chunk: break data += chunk dataframe = pickle.loads(data) return dataframe def close(self): self.s.close() def __str__(self): return f"Client(port={self.port}, host={self.host})" def __repr__(self): return f"Client(port={self.port}, host={self.host})" def __enter__(self): self.connect() return self def __exit__(self, exc_type, exc_val, exc_tb): self.close() client = Client(5000) client.connect() query = "SELECT * FROM table_name" client.send_query(query) dataframe = client.receive_dataframe() print(dataframe) client.close() It says: dataframe = pickle.loads(data) EOFError: Ran out of input Please help me fix it. Change anything you need (in both files).

I have a code (class Server). I need help to fix error in another class. These are 2 seperated files. import socket import pandas as pd import sqlite3 class Server: def init(self, portnumber): self.port = portnumber self.s = socket.socket() self.host = socket.gethostname() self.s.bind((self.host, self.port)) self.s.listen(5) print('Server listening....') def enter(self): return self def exit(self, exc_type, exc_val, exc_tb): self.close() def serve(self): while True: conn, addr = self.s.accept() print('Got connection from', addr) query = conn.recv(1024).decode() print('Server received query:', query) # Process the SQL query and retrieve data data = self.process_query(query) # Send the data back to the client conn.sendall(data.to_msgpack()) print('Sent data:', data) conn.close() def process_query(self, query): # Connect to the SQLDatabase and execute the query connection = sqlite3.connect('data.db') data = pd.read_sql_query(query, connection) connection.close() return data def close(self): self.s.close() # Run the server with Server(5000) as server: server.serve() ___________________________ # Y Nhi Tran # Exercise Client import socket import pickle class Client: def init(self, portnumber): self.port = portnumber self.s = socket.socket() self.host = socket.gethostname() def connect(self): self.s.connect((self.host, self.port)) def send_query(self, query): self.s.send(query.encode()) def receive_dataframe(self): # Receive the data size size_data = b"" while len(size_data) < 4: chunk = self.s.recv(4 - len(size_data)) if not chunk: break size_data += chunk data_size = int.from_bytes(size_data, "big") # Receive the data data = b"" while len(data) < data_size: chunk = self.s.recv(min(data_size - len(data), 4096)) if not chunk: break data += chunk dataframe = pickle.loads(data) return dataframe def close(self): self.s.close() def str(self): return f"Client(port={self.port}, host={self.host})" def repr(self): return f"Client(port={self.port}, host={self.host})" def enter(self): self.connect() return self def exit(self, exc_type, exc_val, exc_tb): self.close() client = Client(5000) client.connect() query = "SELECT * FROM table_name" client.send_query(query) dataframe = client.receive_dataframe() print(dataframe) client.close() It says: dataframe = pickle.loads(data) EOFError: Ran out of input Please help me fix it. Change anything you need (in both files).

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

I have a code (class Server). I need help to fix error in another class. These are 2 seperated files.

import socket
import pandas as pd
import sqlite3

class Server:
def __init__(self, portnumber):
self.port = portnumber
self.s = socket.socket()
self.host = socket.gethostname()
self.s.bind((self.host, self.port))
self.s.listen(5)
print('Server listening....')

def __enter__(self):
return self

def __exit__(self, exc_type, exc_val, exc_tb):
self.close()

def serve(self):
while True:
conn, addr = self.s.accept()
print('Got connection from', addr)
query = conn.recv(1024).decode()
print('Server received query:', query)

# Process the SQL query and retrieve data
data = self.process_query(query)

# Send the data back to the client
conn.sendall(data.to_msgpack())
print('Sent data:', data)

conn.close()

def process_query(self, query):
# Connect to the SQLDatabase and execute the query
connection = sqlite3.connect('data.db')
data = pd.read_sql_query(query, connection)
connection.close()
return data

def close(self):
self.s.close()

# Run the server
with Server(5000) as server:
server.serve()

_______________________________

# Y Nhi Tran
# Exercise Client

import socket
import pickle

class Client:
def __init__(self, portnumber):
self.port = portnumber
self.s = socket.socket()
self.host = socket.gethostname()

def connect(self):
self.s.connect((self.host, self.port))

def send_query(self, query):
self.s.send(query.encode())

def receive_dataframe(self):
# Receive the data size
size_data = b""
while len(size_data) < 4:
chunk = self.s.recv(4 - len(size_data))
if not chunk:
break
size_data += chunk
data_size = int.from_bytes(size_data, "big")

# Receive the data
data = b""
while len(data) < data_size:
chunk = self.s.recv(min(data_size - len(data), 4096))
if not chunk:
break
data += chunk

dataframe = pickle.loads(data)
return dataframe

def close(self):
self.s.close()

def __str__(self):
return f"Client(port={self.port}, host={self.host})"

def __repr__(self):
return f"Client(port={self.port}, host={self.host})"

def __enter__(self):
self.connect()
return self

def __exit__(self, exc_type, exc_val, exc_tb):
self.close()

client = Client(5000)
client.connect()

query = "SELECT * FROM table_name"
client.send_query(query)

dataframe = client.receive_dataframe()
print(dataframe)

client.close()

It says: dataframe = pickle.loads(data)
EOFError: Ran out of input

Please help me fix it. Change anything you need (in both files).

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