2003031132-向欣怡-Python第七周作业-MySQL的安装以及使用
| 项目 | 内容 |
| 课程班级博客链接 | 20级数据班 |
| 这个作业要求链接 | python数据分析与应用第七周作业 |
| 博客名称 | 2003031132-向欣怡-Python第七周作业-MySQL的安装以及使用 |
| 要求 | 每道题要有题目,代码(使用插入代码,不会插入代码的自己查资料解决,不要直接截图代码!!),截图(只截运行结果)。 |
作业:
- 1.安装好MySQL,连接上Navicat。
- 2.完成课本练习(代码4-1~3/4-9~31)。
from sqlalchemy import create_engine #连接数据库 engine=create_engine("mysql+pymysql://root:root@127.0.0.1:3306/testdb?charset=utf8") print(engine) #用pandas查看数据库里面的表 import pandas as pd formlist=pd.read_sql_query('show tables',con=engine) print(formlist) formlist1=pd.read_sql_table('meal_order_detail1',con=engine) print(formlist1) #使用read_sql_table读取订单详情 detail1 = pd.read_sql_table('meal_order_detail1',con = engine) print('使用read_sql_table读取订单详情表的长度为:',len(detail1)) #使用read_ sql读取订单详情表 detail2 = pd.read_sql('select * from meal_order_detail2',con = engine) print('使用read_sql 函数+sql语句读取的订单详情表长度为:',len(detail2)) detail3 = pd.read_sql('meal_order_ detail3',con = engine) print('使用read_sq1函数+表格名称读取的订单详情表的长度为:',len(detail3)) detail1.to_sql('test1',con = engine,index = False,if_exists = 'replace') formlist1 = pd.read_sql_query('show tables',con = engine) print('新增一个表格后.testdb数据库表清单为:‘,''\n',formlist1)
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from sqlalchemy import create_engine engine=create_engine("mysql+pymysql://root:root@127.0.0.1:3306/testdb?charset=utf8") import pandas as pd order1=pd.read_sql_table('meal_order_detail1',con=engine) print("订单详情表1的长度为:",len(order1)) order2=pd.read_sql_table('meal_order_detail2',con=engine) print("订单详情表2的长度为:",len(order2)) order3=pd.read_sql_table('meal_order_detail3',con=engine) print("订单详情表3的长度为:",len(order3)) order4=pd.read_table('D:/桌面/第四章/meal_order_info.csv',sep=",",encoding='gbk') print('订单信息表的长度为:',len(order4)) user=pd.read_excel('D:/桌面/第四章/users.xlsx') print('客户信息表的长度为:',len(user))
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from sqlalchemy import create_engine engine=create_engine("mysql+pymysql://root:root@127.0.0.1:3306/testdb?charset=utf8") print(engine) import pandas as pd #使用read_sql_query查看testdb中的数据表书目 detail=pd.read_sql_table('meal_order_detail1',con=engine) print('订单详情表的索引为:',detail.index) print('订单详情表的所有值为:“,”\n',detail.values) print('订单详情表的列名为:“,”\n',detail.columns) print('订单详情表的数据类型为:“,”\n',detail.dtypes) print('订单详情表的元素个数为:“,”\n',detail.size) print('订单详情表的维度数为:“,”\n',detail.ndim) print('订单详情表的形状为:“,”\n',detail.shape) print('订单详情表转置前形状为:“,”\n',detail.shape) print('订单详情表转置后形状为:“,”\n',detail.T.shape)
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from sqlalchemy import create_engine engine=create_engine("mysql+pymysql://root:root@127.0.0.1:3306/testdb?charset=utf8") print(engine) import pandas as pd #使用read_sql_query查看testdb中的数据表书目 detail=pd.read_sql_table('meal_order_detail1',con=engine) order_id=detail['order_id'] print("订单详情表中的order_id的形状为:','\n",order_id.shape) dishes_name=detail.dishes_name print('订单详情表中的dishes_name的形状为:',dishes_name.shape) dishes_name5=detail['dishes_name'][:5] print('订单详情表中的dishes_name前5个的元素为:',dishes_name5) orderDish=detail[['order_id','dishes_name']][:5] print("订单详情表中的order_id和dishes_name前5个的元素为:","\n",orderDish) order5=detail[:][1:6] print('订单详情表的1——6行元素为:","\n',order5)
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1 from sqlalchemy import create_engine 2 engine=create_engine("mysql+pymysql://root:root@127.0.0.1:3306/testdb?charset=utf8") 3 print(engine) 4 5 import pandas as pd 6 #使用read_sql_query查看testdb中的数据表书目 7 detail=pd.read_sql_table('meal_order_detail1',con=engine) 8 print('订单详情表中前5行数据为:","\n',detail.head()) print('订单详情表中后5行数据为:","\n',detail.tail()) dishes_name1=detail.loc[:,'dishes_name'] print('使用loc提取dishes_name列的size为:',dishes_name1.size) dishes_name2=detail.iloc[:,3] print('使用loc提取第3列的size为:',dishes_name2.size) orderDish1=detail.loc[:,['order_id','dishes_name']] print('使用loc提取order_id和dishes_name列的size为:',orderDish1.size) orderDish2=detail.iloc[:,[1,3]] print('使用iloc提取第1列和第3列的size为:',orderDish2.size) print('列名为order_id和dishes_name的行名为3的数据为:\n',detail.loc[3,['order_id','dishes_name']]) print('列名为order_id和dishes_name的行名为2,3,4,5,6的数据为:\n',detail.loc[2:6,['order_id','dishes_name']]) print('列位置为1和3,行位置为3的数据为:\n',detail.iloc[3,[1,3]]) print('列位置为1和3,行位置为2,3,4,5,6的数据为:\n',detail.iloc[2:7,[1,3]])
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1 from sqlalchemy import create_engine 2 engine=create_engine("mysql+pymysql://root:root@127.0.0.1:3306/testdb?charset=utf8") 3 print(engine) import pandas as pd #使用read_sql_query查看testdb中的数据表书目 detail=pd.read_sql_table('meal_order_detail1',con=engine) print('detail中order为458的dishes_name为;\n',detail.loc[detail['order_id']=='458',['order_id','dishes_name']]) print('detail中order_id为458的1、5列数据为:\n',detail.iloc[(detail['order_id']=='458').values,[1,5]]) print('列名为dishes_name行名为2,3,4,5,6的数据为:\n',detail.loc[2:6,'dishes_name']) print('列位置为5,行位置为2-6的数据为:\n',detail.iloc[2:6,5]) #print('列位置为5,行名为2-6的数据为:","\n',detail.ix[2:6,5]) detail.loc[detail['order_id']=='458','order_id']='45800' print('更改后detail中order_id为458的order_id为:\n',detail.loc[detail['order_id']=='458','order_id']) print('更改后detail中order_id为45800的order_id为:\n',detail.loc[detail['order_id']=='45800','order_id'])
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from sqlalchemy import create_engine engine=create_engine("mysql+pymysql://root:root@127.0.0.1:3306/testdb?charset=utf8") print(engine) import pandas as pd #使用read_sql_query查看testdb中的数据表书目 detail=pd.read_sql_table('meal_order_detail1',con=engine) detail['payment']=detail['counts']*detail['amounts'] print('detail新增列payment的前5行为:","\n',detail['payment'].head()) detail['pay_way']='现金支付' print('detail新增列pay-way的前5行为;","\n',detail['pay_way'].head()) print('删除pay_way前detail的列索引为;","\n',detail.columns) detail.drop(labels='pay_way',axis=1,inplace=True) print('删除pay_way后detail的列索引为:","\n',detail.columns) print('删除1-10行前detail的长度为:',len(detail)) detail.drop(labels=range(1,11),axis=0,inplace=True) print('删除1-10行后detail的长度为:',len(detail))
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