Python3-sqlalchemy-orm 创建关联表带外键并查询数据

#-*-coding:utf-8-*-

#__author__ = "logan.xu"

import sqlalchemy

from sqlalchemy import create_engine,func

from sqlalchemy.ext.declarative import declarative_base

from sqlalchemy import Column,Integer,String,ForeignKey,DATE

from sqlalchemy.orm import sessionmaker,relationship

engine=create_engine("mysql+pymysql://root:12345678@localhost/news",encoding='utf-8',echo=True)

Base=declarative_base()

class Student(Base):

    __tablename__='student'

    id=Column(Integer,primary_key=True)

    name=Column(String(32),nullable=False)

    register_date=Column(DATE,nullable=False)

    def __repr__(self):

        return "<%s name:%s>" % (self.id,self.name)

class StudyRecord(Base):

     __tablename__ = 'study_record'

     id = Column(Integer, primary_key=True)

     day = Column(Integer,nullable=False)

     status = Column(String(32),nullable=False)

     stu_id = Column(Integer,ForeignKey("student.id"))

     student=relationship("Student",backref="my_study_record")

     #

    #def __repr__(self):

        #return "<%s name:%s>" % (self.id,self.day)

　　 def __repr__(self):
   　　 return "<%s day:%s status:%s>" % (self.id,self.day,self.status)

#---------------1.创建表-----------------# 

Base.metadata.create_all(engine)
 #---------------------------------------#  
Session_class = sessionmaker(bind=engine) Session = Session_class() 

#---------------2.写入数据-----------------# 

 s1=Student(name='Alex',register_date="2019-01-09") 
s2=Student(name='Jack',register_date="2019-01-09") 
s3=Student(name='Rain',register_date="2019-01-10") 
s4=Student(name='Eric',register_date="2019-01-11") 
s5=Student(name='John',register_date="2019-01-12") 

# 

study_obj1=StudyRecord(day=1,status="Yes",stu_id=1) 
study_obj2=StudyRecord(day=2,status="NO",stu_id=1) 
study_obj3=StudyRecord(day=3,status="Yes",stu_id=1) 
study_obj4=StudyRecord(day=1,status="NO",stu_id=2) 
study_obj5=StudyRecord(day=1,status="NO",stu_id=2) 

#  ## 写入数据 并调用 study_record字段插入数据 为 Student数据 

Session.add_all([s1,s2,s3,s4,s5,study_obj1,study_obj2,study_obj3,study_obj4,study_obj5]) 

#---------------------------------------# 

#---------------3.查询数据-----------------# 

# 取出student内的 内存对象 
stu_obj = Session.query(Student).filter(Student.name=="Alex").first() 

print(stu_obj.my_study_record) 

#---------------------------------------# 

# 执行事务 Session.commit()

/Users/drizzle/PycharmProjects/2018-12-03/venv/bin/python /Users/drizzle/PycharmProjects/2018-12-03/orm_fk.py

2019-01-08 18:30:00,061 INFO sqlalchemy.engine.base.Engine SHOW VARIABLES LIKE 'sql_mode'

2019-01-08 18:30:00,061 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:30:00,063 INFO sqlalchemy.engine.base.Engine SHOW VARIABLES LIKE 'lower_case_table_names'

2019-01-08 18:30:00,063 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:30:00,065 INFO sqlalchemy.engine.base.Engine SELECT DATABASE()

2019-01-08 18:30:00,065 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:30:00,066 INFO sqlalchemy.engine.base.Engine show collation where `Charset` = 'utf8mb4' and `Collation` = 'utf8mb4_bin'

2019-01-08 18:30:00,066 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:30:00,069 INFO sqlalchemy.engine.base.Engine SELECT CAST('test plain returns' AS CHAR(60)) AS anon_1

2019-01-08 18:30:00,069 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:30:00,069 INFO sqlalchemy.engine.base.Engine SELECT CAST('test unicode returns' AS CHAR(60)) AS anon_1

2019-01-08 18:30:00,069 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:30:00,070 INFO sqlalchemy.engine.base.Engine SELECT CAST('test collated returns' AS CHAR CHARACTER SET utf8mb4) 
COLLATE utf8mb4_bin AS anon_1

2019-01-08 18:30:00,070 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:30:00,071 INFO sqlalchemy.engine.base.Engine DESCRIBE `student`

2019-01-08 18:30:00,071 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:30:00,073 INFO sqlalchemy.engine.base.Engine DESCRIBE `study_record`

2019-01-08 18:30:00,073 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:30:00,080 INFO sqlalchemy.engine.base.Engine BEGIN (implicit)

2019-01-08 18:30:00,081 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)

2019-01-08 18:30:00,081 INFO sqlalchemy.engine.base.Engine {'name': 'Alex', 'register_date': '2019-01-09'}

2019-01-08 18:30:00,082 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)

2019-01-08 18:30:00,082 INFO sqlalchemy.engine.base.Engine {'name': 'Jack', 'register_date': '2019-01-09'}

2019-01-08 18:30:00,082 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)

2019-01-08 18:30:00,082 INFO sqlalchemy.engine.base.Engine {'name': 'Rain', 'register_date': '2019-01-10'}

2019-01-08 18:30:00,083 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)

2019-01-08 18:30:00,083 INFO sqlalchemy.engine.base.Engine {'name': 'Eric', 'register_date': '2019-01-11'}

2019-01-08 18:30:00,083 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)

2019-01-08 18:30:00,083 INFO sqlalchemy.engine.base.Engine {'name': 'John', 'register_date': '2019-01-12'}

2019-01-08 18:30:00,084 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)

2019-01-08 18:30:00,084 INFO sqlalchemy.engine.base.Engine {'day': 1, 'status': 'Yes', 'stu_id': 1}

2019-01-08 18:30:00,085 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)

2019-01-08 18:30:00,085 INFO sqlalchemy.engine.base.Engine {'day': 2, 'status': 'NO', 'stu_id': 1}

2019-01-08 18:30:00,085 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)

2019-01-08 18:30:00,085 INFO sqlalchemy.engine.base.Engine {'day': 3, 'status': 'Yes', 'stu_id': 1}

2019-01-08 18:30:00,086 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)

2019-01-08 18:30:00,086 INFO sqlalchemy.engine.base.Engine {'day': 1, 'status': 'NO', 'stu_id': 2}

2019-01-08 18:30:00,086 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)

2019-01-08 18:30:00,086 INFO sqlalchemy.engine.base.Engine {'day': 1, 'status': 'NO', 'stu_id': 2}

2019-01-08 18:30:00,088 INFO sqlalchemy.engine.base.Engine SELECT student.id AS student_id, student.name AS student_name, student.register_date 
AS student_register_date

FROM student

WHERE student.name = %(name_1)s

 LIMIT %(param_1)s

2019-01-08 18:30:00,088 INFO sqlalchemy.engine.base.Engine {'name_1': 'Alex', 'param_1': 1}

2019-01-08 18:30:00,090 INFO sqlalchemy.engine.base.Engine SELECT study_record.id AS study_record_id, study_record.day AS study_record_day, 
study_record.status AS study_record_status, study_record.stu_id AS study_record_stu_id

FROM study_record

WHERE %(param_1)s = study_record.stu_id

2019-01-08 18:30:00,090 INFO sqlalchemy.engine.base.Engine {'param_1': 1}

[<2 day:1 status:Yes>, <3 day:2 status:NO>, <4 day:3 status:Yes>, <7 day:1 status:Yes>, <8 day:2 status:NO>, <9 day:3 status:Yes>, 
<12 day:1 status:Yes>, <13 day:2 status:NO>, <14 day:3 status:Yes>]

2019-01-08 18:30:00,091 INFO sqlalchemy.engine.base.Engine COMMIT

Process finished with exit code 0

可以在study_record 反查student表信息

#-*-coding:utf-8-*-

#__author__ = "logan.xu"

import sqlalchemy

from sqlalchemy import create_engine,func

from sqlalchemy.ext.declarative import declarative_base

from sqlalchemy import Column,Integer,String,ForeignKey,DATE

from sqlalchemy.orm import sessionmaker,relationship

engine=create_engine("mysql+pymysql://root:12345678@localhost/news",encoding='utf-8',echo=True)

Base=declarative_base()

class Student(Base):

    __tablename__='student'

    id=Column(Integer,primary_key=True)

    name=Column(String(32),nullable=False)

    register_date=Column(DATE,nullable=False)

    def __repr__(self):

        return "<%s name:%s>" % (self.id,self.name)

class StudyRecord(Base):

     __tablename__ = 'study_record'

     id = Column(Integer, primary_key=True)

     day = Column(Integer,nullable=False)

     status = Column(String(32),nullable=False)

     stu_id = Column(Integer,ForeignKey("student.id"))

     student=relationship("Student",backref="my_study_record")

     #

     def __repr__(self):

        return "<%s day:%s status:%s>" % (self.student.name,self.day,self.status)

#---------------1.创建表-----------------#

Base.metadata.create_all(engine)

#---------------------------------------#

Session_class = sessionmaker(bind=engine)

Session = Session_class()

#---------------2.写入数据-----------------#

s1=Student(name='Alex',register_date="2019-01-09")

s2=Student(name='Jack',register_date="2019-01-09")

s3=Student(name='Rain',register_date="2019-01-10")

s4=Student(name='Eric',register_date="2019-01-11")

s5=Student(name='John',register_date="2019-01-12")

#

study_obj1=StudyRecord(day=1,status="Yes",stu_id=1)

study_obj2=StudyRecord(day=2,status="NO",stu_id=1)

study_obj3=StudyRecord(day=3,status="Yes",stu_id=1)

study_obj4=StudyRecord(day=1,status="NO",stu_id=2)

study_obj5=StudyRecord(day=1,status="NO",stu_id=2)

#

## 写入数据 并调用 study_record字段插入数据 为 Student数据

Session.add_all([s1,s2,s3,s4,s5,study_obj1,study_obj2,study_obj3,study_obj4,study_obj5])

#---------------------------------------#

#---------------3.查询数据-----------------#

# 取出student内的 内存对象

stu_obj = Session.query(Student).filter(Student.name=="Alex").first()

print(stu_obj.my_study_record)

#---------------------------------------#

# 执行事务

Session.commit()

/Users/drizzle/PycharmProjects/2018-12-03/venv/bin/python /Users/drizzle/PycharmProjects/2018-12-03/orm_fk.py

2019-01-08 18:35:46,521 INFO sqlalchemy.engine.base.Engine SHOW VARIABLES LIKE 'sql_mode'

2019-01-08 18:35:46,522 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:35:46,523 INFO sqlalchemy.engine.base.Engine SHOW VARIABLES LIKE 'lower_case_table_names'

2019-01-08 18:35:46,523 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:35:46,525 INFO sqlalchemy.engine.base.Engine SELECT DATABASE()

2019-01-08 18:35:46,525 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:35:46,526 INFO sqlalchemy.engine.base.Engine show collation where `Charset` = 'utf8mb4' and `Collation` = 'utf8mb4_bin'

2019-01-08 18:35:46,526 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:35:46,529 INFO sqlalchemy.engine.base.Engine SELECT CAST('test plain returns' AS CHAR(60)) AS anon_1

2019-01-08 18:35:46,529 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:35:46,529 INFO sqlalchemy.engine.base.Engine SELECT CAST('test unicode returns' AS CHAR(60)) AS anon_1

2019-01-08 18:35:46,530 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:35:46,530 INFO sqlalchemy.engine.base.Engine SELECT CAST('test collated returns' AS CHAR CHARACTER SET utf8mb4) 
COLLATE utf8mb4_bin AS anon_1

2019-01-08 18:35:46,530 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:35:46,531 INFO sqlalchemy.engine.base.Engine DESCRIBE `student`

2019-01-08 18:35:46,531 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:35:46,533 INFO sqlalchemy.engine.base.Engine DESCRIBE `study_record`

2019-01-08 18:35:46,533 INFO sqlalchemy.engine.base.Engine {}

2019-01-08 18:35:46,541 INFO sqlalchemy.engine.base.Engine BEGIN (implicit)

2019-01-08 18:35:46,542 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)

2019-01-08 18:35:46,542 INFO sqlalchemy.engine.base.Engine {'name': 'Alex', 'register_date': '2019-01-09'}

2019-01-08 18:35:46,543 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)

2019-01-08 18:35:46,543 INFO sqlalchemy.engine.base.Engine {'name': 'Jack', 'register_date': '2019-01-09'}

2019-01-08 18:35:46,544 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)

2019-01-08 18:35:46,544 INFO sqlalchemy.engine.base.Engine {'name': 'Rain', 'register_date': '2019-01-10'}

2019-01-08 18:35:46,544 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)

2019-01-08 18:35:46,544 INFO sqlalchemy.engine.base.Engine {'name': 'Eric', 'register_date': '2019-01-11'}

2019-01-08 18:35:46,545 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)

2019-01-08 18:35:46,545 INFO sqlalchemy.engine.base.Engine {'name': 'John', 'register_date': '2019-01-12'}

2019-01-08 18:35:46,546 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)

2019-01-08 18:35:46,546 INFO sqlalchemy.engine.base.Engine {'day': 1, 'status': 'Yes', 'stu_id': 1}

2019-01-08 18:35:46,547 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)

2019-01-08 18:35:46,547 INFO sqlalchemy.engine.base.Engine {'day': 2, 'status': 'NO', 'stu_id': 1}

2019-01-08 18:35:46,547 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)

2019-01-08 18:35:46,547 INFO sqlalchemy.engine.base.Engine {'day': 3, 'status': 'Yes', 'stu_id': 1}

2019-01-08 18:35:46,548 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)

2019-01-08 18:35:46,548 INFO sqlalchemy.engine.base.Engine {'day': 1, 'status': 'NO', 'stu_id': 2}

2019-01-08 18:35:46,548 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)

2019-01-08 18:35:46,548 INFO sqlalchemy.engine.base.Engine {'day': 1, 'status': 'NO', 'stu_id': 2}

2019-01-08 18:35:46,550 INFO sqlalchemy.engine.base.Engine SELECT student.id AS student_id, student.name AS student_name, student.register_date AS student_register_date

FROM student

WHERE student.name = %(name_1)s

 LIMIT %(param_1)s

2019-01-08 18:35:46,550 INFO sqlalchemy.engine.base.Engine {'name_1': 'Alex', 'param_1': 1}

2019-01-08 18:35:46,552 INFO sqlalchemy.engine.base.Engine SELECT study_record.id AS study_record_id, study_record.day AS study_record_day, 
study_record.status AS study_record_status, study_record.stu_id AS study_record_stu_id

FROM study_record

WHERE %(param_1)s = study_record.stu_id

2019-01-08 18:35:46,552 INFO sqlalchemy.engine.base.Engine {'param_1': 1}

[<Alex day:1 status:Yes>, <Alex day:2 status:NO>, <Alex day:3 status:Yes>, <Alex day:1 status:Yes>, <Alex day:2 status:NO>, 
<Alex day:3 status:Yes>, <Alex day:1 status:Yes>, <Alex day:2 status:NO>, <Alex day:3 status:Yes>, <Alex day:1 status:Yes>, 
<Alex day:2 status:NO>, <Alex day:3 status:Yes>]

2019-01-08 18:35:46,553 INFO sqlalchemy.engine.base.Engine COMMIT

Process finished with exit code 0

Python3-sqlalchemy-orm 创建关联表带外键并查询数据的更多相关文章

Python3-sqlalchemy-orm 创建关联表带外键并插入数据
#-*-coding:utf-8-*- #__author__ = "logan.xu" import sqlalchemy from sqlalchemy import crea ...
Python3-sqlalchemy-orm 创建多表关联表带外键
#-*-coding:utf-8-*- #__author__ = "logan.xu" import sqlalchemy from sqlalchemy import crea ...
《Entity Framework 6 Recipes》中文翻译系列 (37) ------ 第六章继承与建模高级应用之独立关联与外键关联
翻译的初衷以及为什么选择<Entity Framework 6 Recipes>来学习,请看本系列开篇 6-13 在基类中应用条件问题你想从一个已存在的模型中的实体派生一个新的实体, ...
数据库的SQL语句创建和主外键删除操作
create table UserType ( Id ,), Name nvarchar() not null ) go create table UserInfo ( Id ,), LoginPwd ...
mysql数据库：分表、多表关联、外键约束、级联操作
一.分表.外键.级联.多对一二.多对多三.一对一一.分表.外键.级联.多对一将部门数据与员工数据放到同一张表中会造成数据重复结构混乱扩展维护性差需要分表 create table de ...
003--PowerDesigner创建索引与外键
PowerDesigner创建索引与外键一.创建索引双击Table->Columns->创建索引 Step1:双击Table Step2:选择Columns->创建索引弹出如下 ...
SQLSERVER清空(Truncate)被外键引用的数据表
前言:我们知道SQLSERVER清空数据表有两种方式Delete和Truncate,当然两者的不同大家也都知道(不清楚的可以MSDN).不过这个错误“Cannot truncate table be ...
Django ORM - 001 - 外键表查询主表信息
开始用Django做web开发,我想大家都会遇到同样的问题,那就是如何高效快速的查询需要的数据,MVC都很简单,但是ORM折腾起来就有些费时间,我准备好好研究下Django ORM,所以会有一个系列的 ...
使用Navicat V8.0创建数据库，外键出现错误ERROR 1005: Can’t create table (errno: 121)
ERROR 1005: Can't create table (errno: 121) errno 121 means a duplicate key error. Probably the tabl ...

随机推荐

POJ2482 Stars in Your Window 题解
Fleeting time does not blur my memory of you. Can it really be 4 years since I first saw you? I stil ...
Windows Server创建域控制器
推荐选择系统镜像为windows server2016(2019有诡异的bug不能安装域控.) 1.本地域安装设置 (1)连接到windows server2016 打开服务器管理器(Server M ...
Ubuntu Server连接Wi-Fi
本文将介绍Ubuntu Server如何通过命令行使用wpa_supplicant连接Wi-Fi 环境 Ubuntu Server 20.04(64位) wpasupplicant 配置 1. 安装 ...
tomcat与springmvc 结合之---第16篇 servlet如何解析成员变量和DispatcherServlet如何解析
writedby 张艳涛,用了两个星期将深入刨析tomcat看完了,那么接下来该看什么呢?真是不知道,知识这东西上一个月看的jvm,锁.多线程并发又都忘了.... tomcat学完,我打算看spri ...
大都市meg DFS序
题目描述在经济全球化浪潮的影响下,习惯于漫步在清晨的乡间小路的邮递员Blue Mary也开始骑着摩托车传递邮件了.不过,她经常回忆起以前在乡间漫步的情景.昔日,乡下有依次编号为1..n的n个小村庄, ...
使用Fileupload完成文件的上传下载
目录使用Fileupload完成文件的上传下载为什么需要进行文件上传下载? 引入jar包文件上传注意事项编写一个简单的文件上传jsp页面编写Servlet Student类用于封装数据,后 ...
大数据开发-Go-数组，切片
new()和make的区别二者看起来没什么区别,但是他们的行为不同,分别适用于不同的类型 new (T) 为每个新的类型 T 分配一片内存,初始化为 0 并且返回类型为 * T 的内存地址:这种方法 ...
requests 上件中文文件名报错解决方案
这几天在用wxpy写机器人,在调用里面的上传文件接口的时候,一直报错.经过排查后,发现是不支持中文文件名:在群里问了下作者后才知道是requests惹的祸,默认requests用的是unicode来处 ...
css文件编码
当css文件的编码
从事 Android应用开发4年有余，现在工资7500。很不爽！怎么办？
最近到某论坛看到一个帖子: 坐标北京,在一个公司从事android应用开发4年有余(毕业至今没换过公司).公司利润越来越大,工资却每年长1000,如今才到7500.琢磨着换工作,又不想扔下这四年来逐步 ...

Python3-sqlalchemy-orm 创建关联表带外键并查询数据

Python3-sqlalchemy-orm 创建关联表带外键并查询数据的更多相关文章

随机推荐

热门专题