Python 操作 MySQL
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
# 获取最新自增ID
# new_id = cursor.lastrowid
# 关闭游标
cursor.close()
# 关闭连接
conn.close()
# 示例:
# fetch 默认获取的数据是元组类型,也可以设置为字典类型
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
r = cursor.execute('select * from student')
print(cursor.fetchall())
参考资料:
