1.数据库-pymysql

import pymysql# 获取链接对象conn = pymysql.connect(host="localhost", port=3306, user='root', password='cgroot', database='pymysqltest',charset='utf8')# 事务conn.begin()# conn.rollback()# 获取游标对象cursor = conn.c

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97人浏览 · 2021-11-02 17:46:38

C--G · 2021-11-02 17:46:38 发布

import pymysql

# 获取链接对象
conn = pymysql.connect(host="localhost", port=3306, user='root', password='cgroot', database='pymysqltest',
                       charset='utf8')

# 事务
conn.begin()
# conn.rollback()

# 获取游标对象
cursor = conn.cursor()
sql = 'select * from students;'
row_count = cursor.execute(sql)

print("执行结果", row_count)
# 取出结果元组一行数据
oneData = cursor.fetchone()
print("取出结果元组一行数据", type(oneData), oneData)
# 取出元组剩下的所有数据
allData = cursor.fetchall()
print("取出元组剩下所有数据", type(allData), allData)

name = input("请输入修改的用户名：")
# 修改
updateSql = "update students set gender = '男' where name =%s;"
# 使用%s占位符，防止sql注入
updateResult = cursor.execute(updateSql, [name])
print("修改结果：", updateResult)
# 涉及对数据库数据的修改，需要提交，否则不会生效
conn.commit()

row_count = cursor.execute(sql)
print("执行结果", row_count)
# 取出结果元组一行数据
oneData = cursor.fetchone()
print("取出结果元组一行数据", type(oneData), oneData)
# 取出元组剩下的所有数据
allData = cursor.fetchall()
print("取出元组剩下所有数据", type(allData), allData)

# 关闭游标
cursor.close()
# 关闭链接
conn.close()