三 增、删、改：conn.commit()

import pymysql
#链接
conn=pymysql.connect(host=‘localhost‘,user=‘root‘,password=‘123‘,database=‘egon‘)
#游标
cursor=conn.cursor()

#执行sql语句
#part1
# sql=‘insert into userinfo(name,password) values("root","123456");‘
# res=cursor.execute(sql) #执行sql语句，返回sql影响成功的行数
# print(res)

#part2
# sql=‘insert into userinfo(name,password) values(%s,%s);‘
# res=cursor.execute(sql,("root","123456")) #执行sql语句，返回sql影响成功的行数
# print(res)

#part3
sql=‘insert into userinfo(name,password) values(%s,%s);‘
res=cursor.executemany(sql,[("root","123456"),("lhf","12356"),("eee","156")]) #执行sql语句，返回sql影响成功的行数
print(res)

conn.commit() #提交后才发现表中插入记录成功
cursor.close()
conn.close()

四、查：fetchone，fetchmany，fetchall

import pymysql
#链接
conn=pymysql.connect(host=‘localhost‘,user=‘root‘,password=‘123‘,database=‘egon‘)
#游标
cursor=conn.cursor()

#执行sql语句
sql=‘select * from userinfo;‘
rows=cursor.execute(sql) #执行sql语句，返回sql影响成功的行数rows,将结果放入一个集合，等待被查询

# cursor.scroll(3,mode=‘absolute‘) # 相对绝对位置移动
# cursor.scroll(3,mode=‘relative‘) # 相对当前位置移动
res1=cursor.fetchone()
res2=cursor.fetchone()
res3=cursor.fetchone()
res4=cursor.fetchmany(2)
res5=cursor.fetchall()
print(res1)
print(res2)
print(res3)
print(res4)
print(res5)
print(‘%s rows in set (0.00 sec)‘ %rows)



conn.commit() #提交后才发现表中插入记录成功
cursor.close()
conn.close()

‘‘‘
(1, ‘root‘, ‘123456‘)
(2, ‘root‘, ‘123456‘)
(3, ‘root‘, ‘123456‘)
((4, ‘root‘, ‘123456‘), (5, ‘root‘, ‘123456‘))
((6, ‘root‘, ‘123456‘), (7, ‘lhf‘, ‘12356‘), (8, ‘eee‘, ‘156‘))
rows in set (0.00 sec)
‘‘‘

六、获取插入的最后一条数据的自增ID

import pymysql
conn=pymysql.connect(host=‘localhost‘,user=‘root‘,password=‘123‘,database=‘egon‘)
cursor=conn.cursor()

sql=‘insert into userinfo(name,password) values("xxx","123");‘
rows=cursor.execute(sql)
print(cursor.lastrowid) #在插入语句后查看

conn.commit()

cursor.close()
conn.close()

mysql之pymysql模块

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