Python连接mysql数据库及简单增删改查操作示例代码

Python连接mysql数据库及简单增删改查操作示例代码

1.安装pymysql

进入cmd，输入 pip install pymysql:

2.数据库建表

在数据库中，建立一个简单的表，如图：

3.简单操作

 3.1查询操作

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#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()

运行结果：

3.2插入操作

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#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()

运行结果：

3.3更新操作

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#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()

运行结果：

3.4删除操作

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#coding=utf-8 #删除操作 import pymysql db = pymysql.connect(host="localhost",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()

运行结果：