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 efinally: db.close() |
运行结果：
3.2插入操作
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#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
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#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
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#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：
