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

#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 efinally: db.close()

运行结果：

3.2插入操作

#coding=utf-8#插入操作import pymysqldb = 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

#coding=utf-8#更新操作import pymysqldb = 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

#coding=utf-8#删除操作import pymysqldb = 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：

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