psycopg2:在SELECT查询之间执行更新后，重新使用游标重新运行SELECT查询

import psycopg2

# 连接到PostgreSQL数据库
conn = psycopg2.connect(database="your_database", user="your_username", password="your_password", host="your_host", port="your_port")

# 创建游标对象
cur = conn.cursor()

# 执行SELECT查询
cur.execute("SELECT * FROM your_table")

# 获取查询结果
rows = cur.fetchall()
for row in rows:
    print(row)

# 执行更新操作
cur.execute("UPDATE your_table SET column1 = 'new_value' WHERE condition")

# 提交事务
conn.commit()

# 重置游标位置
cur.scroll(0, mode='absolute')

# 重新执行SELECT查询
cur.execute("SELECT * FROM your_table")

# 获取查询结果
rows = cur.fetchall()
for row in rows:
    print(row)

# 关闭游标和数据库连接
cur.close()
conn.close()