如何在pyodbc中同时并行运行n个游标上的n个进程？

import pyodbc
import threading

# 创建数据库连接
conn = pyodbc.connect('DRIVER={SQL Server};SERVER=localhost;DATABASE=testdb;UID=username;PWD=password')

# 定义一个函数，用于执行查询并打印结果
def execute_query(cursor, query):
    cursor.execute(query)
    rows = cursor.fetchall()
    for row in rows:
        print(row)

# 定义一个函数，用于创建并行运行的线程
def create_thread(cursor, query):
    thread = threading.Thread(target=execute_query, args=(cursor, query))
    thread.start()

# 创建游标列表和查询列表
cursors = []
queries = ["SELECT * FROM table1", "SELECT * FROM table2", "SELECT * FROM table3"]

# 创建并启动线程
for i in range(len(queries)):
    cursor = conn.cursor()
    cursors.append(cursor)
    create_thread(cursor, queries[i])

# 等待所有线程执行完毕
for thread in threading.enumerate():
    if thread != threading.current_thread():
        thread.join()

# 关闭数据库连接
conn.close()