Python连接mysql数据库及简单增删改查操作示例代码

#coding=utf-8
#连接数据库测试
import pymysql
#打开数据库
db = pymysql.connect(host="localhost",user="root",password="root",db="test")
#使用cursor()方法获取操作游标
cur = db.cursor()
#查询操作
sql = "select * from books"
try:
  # 执行sql语句
  cur.execute(sql) 
  results = cur.fetchall()
  #遍历结果
  for rows in results:
    id = rows[0]
    name = rows[1]
    price = rows[2]
    bookcount = rows[3]
    author = rows[4]
    print("id: {}, name: {}, price: {}, bookcount: {}, author: {}".format(id,name,price,bookcount,author))
except Exception as e:
  raise e
finally:
  db.close()

#coding=utf-8
#插入操作
import pymysql
db = pymysql.connect(host="localhost",user="root",password="root",db="test")
cur = db.cursor()
sql = """insert into books(id,bookname,price,bookCount,author) values (4,'三体',20,3,'刘慈欣')"""
try:
  cur.execute(sql)
  #提交
  db.commit()
except Exception as e:
  #错误回滚
  db.rollback()
finally:
  db.close()

#coding=utf-8
#更新操作
import pymysql
db = pymysql.connect(host="localhost",user="root",password="root",db="test")
# 使用cursor()方法获取游标
cur = db.cursor()
sql_update = "update books set bookname = '%s',author = '%s' where id = %d"
try:
  cur.execute(sql_update % ("边城","沈从文",4))
  #提交
  db.commit()
except Exception as e:
  #错误回滚
  db.rollback()
finally:
  db.close()

#coding=utf-8
#删除操作
import pymysql
db = pymysql.connect(host="lo<b>本文来源gao@!dai!ma.com搞$$代^@码!网</b>calhost",user="root",password="root",db="test")
#使用cursor()获取操作游标
cur = db.cursor()
sql_delete = "delete from books where id = %d"
try:
  #向sql语句传递参数
  cur.execute(sql_delete % (1))
  #提交
  db.commit()
except Exception as e:
  #错误回滚
  db.rollback()
finally:
  db.close()