多测师讲解python +mysql _001_高级讲师肖sir

#python + Mysqldb
#Mpymysql 库名,关于数据库操作的库
#先进行安装这个库
#方法一:pip install pymysql
#方法二:在pycharm 中搜素pymysql

案例1：

import pymysql   #或者引用pymysql
db=pymysql.connect("192.168.153.131","root","123456","baoan",3306,charset='utf8')   #连接数据库
cursor=db.cursor()  #游标对象
sql="select * f rom dept where dept1=102"    #sql语句
#sql0="select * from dept"    #sql语句
#sql1="select count(*) from dept"    #sql语句
#sql2="insert into dept(dept1,dept_name) values(106,'ittest') "
#sql3="update dept set dept_name = 'it' where dept1=106"
# sql4="delete from dept where dept1=106"
# #cursor.execute(sql2)              #执行语句
# #cursor.execute(sql3)
# #cursor.execute(sql4)
cursor.execute(sql)               #查询更新后的数据
one=cursor.fetchone()            #游标获取并占用一条数据
print (one)

　　

import pymysql   #或者引用pymysql
db=pymysql.connect("192.168.153.131","root","123456","baoan",3306,charset='utf8')   #连接数据库
cursor=db.cursor()  #游标对象
#sql="select * f rom dept where dept1=102"    #sql语句
sql0="select * from dept"    #sql语句
#sql1="select count(*) from dept"    #sql语句
#sql2="insert into dept(dept1,dept_name) values(106,'ittest') "
#sql3="update dept set dept_name = 'it' where dept1=106"
# sql4="delete from dept where dept1=106"
# #cursor.execute(sql2)              #执行语句
# #cursor.execute(sql3)
# #cursor.execute(sql4)
# cursor.execute(sql)               #查询更新后的数据
# one=cursor.fetchone()            #游标获取并占用一条数据
# print (one)
# cursor.execute(sql4)             #删除符合条件的数据
# cursor.execute(sql)              #查询符合条件的数据
# two=cursor.fetchone()            #获取占用这条数据
# print (two)
cursor.execute(sql0)              #执行语句
all=cursor.fetchall()      #游标获取未被占用的所有数据.
print (all)

　　

插入数据

import pymysql   #或者引用pymysql
db=pymysql.connect("192.168.153.131","root","123456","baoan",3306,charset='utf8')   #连接数据库
cursor=db.cursor()  #游标对象
#sql="select * f rom dept where dept1=102"    #sql语句
#sql0="select * from dept"    #sql语句
#sql1="select count(*) from dept"    #sql语句
sql2="insert into dept(dept1,dept_name) values(106,'ittest') "
#sql3="update dept set dept_name = 'it' where dept1=106"
# sql4="delete from dept where dept1=106"
cursor.execute(sql2)              #执行语句
# #cursor.execute(sql3)
# #cursor.execute(sql4)
# cursor.execute(sql1)               #查询更新后的数据
one=cursor.fetchone()            #游标获取并占用一条数据
print (one)

　

修改数据

import pymysql   #或者引用pymysql
db=pymysql.connect("192.168.153.131","root","123456","baoan",3306,charset='utf8')   #连接数据库
cursor=db.cursor()  #游标对象
#sql="select * f rom dept where dept1=102"    #sql语句
#sql0="select * from dept"    #sql语句
#sql1="select count(*) from dept"    #sql语句
#sql2="insert into dept(dept1,dept_name) values(106,'ittest') "
sql3="update dept set dept_name = 'it' where dept1=106"
# sql4="delete from dept where dept1=106"
#cursor.execute(sql2)              #执行语句
cursor.execute(sql3)
#cursor.execute(sql4)
# cursor.execute(sql1)               #查询更新后的数据
one=cursor.fetchone()            #游标获取并占用一条数据
print (one

　

删除数据

import pymysql   #或者引用pymysql
db=pymysql.connect("192.168.153.131","root","123456","baoan",3306,charset='utf8')   #连接数据库
cursor=db.cursor()  #游标对象
#sql="select * f rom dept where dept1=102"    #sql语句
#sql0="select * from dept"    #sql语句
#sql1="select count(*) from dept"    #sql语句
#sql2="insert into dept(dept1,dept_name) values(106,'ittest') "
#sql3="update dept set dept_name = 'it' where dept1=106"
sql4="delete from dept where dept1=106"
#cursor.execute(sql2)              #执行语句
#cursor.execute(sql3)
cursor.execute(sql4)
# cursor.execute(sql1)               #查询更新后的数据
one=cursor.fetchone()            #游标获取并占用一条数据
print (one)