Python 操作 MySQL

Posted 2020-10-29 思考与践行

1. 准备工作

• 安装pymysql: pip3 install pymysql
• pymysql是专门用于操作MySQL的python模块;

2. 操作MySQL

# 示例:
import pymysql

# 创建连接
conn = pymysql.connect(host='local', port=3306, user='root', passwd='root', db='test', charset='utf8')

# 创建游标
cursor = conn.cursor()

# 执行SQL, 并返回影响行数
effect_row = cursor.execute("update hosts set host = '1.1.1.3'")

# 执行SQL, 并返回影响行数
# effect_row = cursor.execute("update hosts set host = '1.1.1.2' where nid > %s", (1,))

# 执行SQL, 并返回受影响行数
# effect_row = cursor.executemany(
#    "insert into hosts(host, color_id)values(%s,%s)", [("1.1.1.11",1),("1.1.1.11",2)])

# 提交,不然无法保存新建或者修改的数据
conn.commit()

# 查询
r = cursor.execute('select * from student')
print(r)
# 从查询结果中获取所有数据
print(cursor.fetchall())    # 结果为元组
print(cursor.fetchone())    # 获取结果中的第一条数据

# 关闭游标
cursor.close()

# 关闭连接
conn.close()

参考资料:

• Python 全栈