Python3-sqlalchemy-orm 创建关联表带外键并插入数据
2024-08-31 20:19:06
#-*-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")) def __repr__(self):
return "<%s name:%s>" % (self.id,self.day) #---------------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]) #---------------------------------------# # 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 18:08:40,496 INFO sqlalchemy.engine.base.Engine SHOW VARIABLES LIKE 'sql_mode'
2019-01-08 18:08:40,496 INFO sqlalchemy.engine.base.Engine {}
2019-01-08 18:08:40,498 INFO sqlalchemy.engine.base.Engine SHOW VARIABLES LIKE 'lower_case_table_names'
2019-01-08 18:08:40,498 INFO sqlalchemy.engine.base.Engine {}
2019-01-08 18:08:40,500 INFO sqlalchemy.engine.base.Engine SELECT DATABASE()
2019-01-08 18:08:40,500 INFO sqlalchemy.engine.base.Engine {}
2019-01-08 18:08:40,501 INFO sqlalchemy.engine.base.Engine show collation where `Charset` = 'utf8mb4' and `Collation` = 'utf8mb4_bin'
2019-01-08 18:08:40,501 INFO sqlalchemy.engine.base.Engine {}
2019-01-08 18:08:40,504 INFO sqlalchemy.engine.base.Engine SELECT CAST('test plain returns' AS CHAR(60)) AS anon_1
2019-01-08 18:08:40,504 INFO sqlalchemy.engine.base.Engine {}
2019-01-08 18:08:40,504 INFO sqlalchemy.engine.base.Engine SELECT CAST('test unicode returns' AS CHAR(60)) AS anon_1
2019-01-08 18:08:40,504 INFO sqlalchemy.engine.base.Engine {}
2019-01-08 18:08:40,505 INFO sqlalchemy.engine.base.Engine SELECT CAST('test collated returns' AS
CHAR CHARACTER SET utf8mb4) COLLATE utf8mb4_bin AS anon_1
2019-01-08 18:08:40,505 INFO sqlalchemy.engine.base.Engine {}
2019-01-08 18:08:40,506 INFO sqlalchemy.engine.base.Engine DESCRIBE `student`
2019-01-08 18:08:40,506 INFO sqlalchemy.engine.base.Engine {}
2019-01-08 18:08:40,507 INFO sqlalchemy.engine.base.Engine DESCRIBE `study_record`
2019-01-08 18:08:40,507 INFO sqlalchemy.engine.base.Engine {}
2019-01-08 18:08:40,511 INFO sqlalchemy.engine.base.Engine BEGIN (implicit)
2019-01-08 18:08:40,512 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)
2019-01-08 18:08:40,512 INFO sqlalchemy.engine.base.Engine {'name': 'Alex', 'register_date': '2019-01-09'}
2019-01-08 18:08:40,513 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)
2019-01-08 18:08:40,513 INFO sqlalchemy.engine.base.Engine {'name': 'Jack', 'register_date': '2019-01-09'}
2019-01-08 18:08:40,513 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)
2019-01-08 18:08:40,514 INFO sqlalchemy.engine.base.Engine {'name': 'Rain', 'register_date': '2019-01-10'}
2019-01-08 18:08:40,514 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)
2019-01-08 18:08:40,514 INFO sqlalchemy.engine.base.Engine {'name': 'Eric', 'register_date': '2019-01-11'}
2019-01-08 18:08:40,515 INFO sqlalchemy.engine.base.Engine INSERT INTO student (name, register_date) VALUES (%(name)s, %(register_date)s)
2019-01-08 18:08:40,515 INFO sqlalchemy.engine.base.Engine {'name': 'John', 'register_date': '2019-01-12'}
2019-01-08 18:08:40,516 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)
2019-01-08 18:08:40,516 INFO sqlalchemy.engine.base.Engine {'day': 1, 'status': 'Yes', 'stu_id': 1}
2019-01-08 18:08:40,517 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)
2019-01-08 18:08:40,517 INFO sqlalchemy.engine.base.Engine {'day': 2, 'status': 'NO', 'stu_id': 1}
2019-01-08 18:08:40,517 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)
2019-01-08 18:08:40,517 INFO sqlalchemy.engine.base.Engine {'day': 3, 'status': 'Yes', 'stu_id': 1}
2019-01-08 18:08:40,518 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)
2019-01-08 18:08:40,518 INFO sqlalchemy.engine.base.Engine {'day': 1, 'status': 'NO', 'stu_id': 2}
2019-01-08 18:08:40,518 INFO sqlalchemy.engine.base.Engine INSERT INTO study_record (day, status, stu_id) VALUES (%(day)s, %(status)s, %(stu_id)s)
2019-01-08 18:08:40,518 INFO sqlalchemy.engine.base.Engine {'day': 1, 'status': 'NO', 'stu_id': 2}
2019-01-08 18:08:40,519 INFO sqlalchemy.engine.base.Engine COMMIT Process finished with exit code 0
mysql> show tables;
+----------------+
| Tables_in_news |
+----------------+
| address |
| customer |
| student |
| study_record |
| user |
+----------------+
5 rows in set (0.01 sec) mysql> desc student;
+---------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------+-------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| name | varchar(32) | NO | | NULL | |
| register_date | date | NO | | NULL | |
+---------------+-------------+------+-----+---------+----------------+
3 rows in set (0.00 sec) mysql> desc study_record;
+--------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------+-------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| day | int(11) | NO | | NULL | |
| status | varchar(32) | NO | | NULL | |
| stu_id | int(11) | YES | MUL | NULL | |
+--------+-------------+------+-----+---------+----------------+
4 rows in set (0.00 sec) mysql> select * from student;
Empty set (0.00 sec) mysql> select * from stuy_record;
ERROR 1146 (42S02): Table 'news.stuy_record' doesn't exist
mysql>
mysql> select * from study_record;
Empty set (0.00 sec) mysql> show tables;
+----------------+
| Tables_in_news |
+----------------+
| address |
| customer |
| student |
| study_record |
| user |
+----------------+
5 rows in set (0.00 sec) mysql> show create table student;
+---------+-------------------------------------------------------------+
| Table | Create Table |
+---------+-------------------------------------------------------------+
| student | CREATE TABLE `student` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(32) NOT NULL,
`register_date` date NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci |
+---------+-------------------------------------------------------------+
1 row in set (0.00 sec) mysql> show create table study_record;
+--------------+-------------------------------------------------------------------------+
| Table | Create Table |
+--------------+-------------------------------------------------------------------------+
| study_record | CREATE TABLE `study_record` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`day` int(11) NOT NULL,
`status` varchar(32) NOT NULL,
`stu_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `stu_id` (`stu_id`),
CONSTRAINT `study_record_ibfk_1` FOREIGN KEY (`stu_id`) REFERENCES `student` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci |
+--------------+------------------------------------------------------------------------+
1 row in set (0.00 sec) mysql> select * from study_record;
+----+-----+--------+--------+
| id | day | status | stu_id |
+----+-----+--------+--------+
| 2 | 1 | Yes | 1 |
| 3 | 2 | NO | 1 |
| 4 | 3 | Yes | 1 |
| 5 | 1 | NO | 2 |
| 6 | 1 | NO | 2 |
+----+-----+--------+--------+
5 rows in set (0.00 sec) mysql> select * from student;
+----+------+---------------+
| id | name | register_date |
+----+------+---------------+
| 1 | Alex | 2019-01-09 |
| 2 | Jack | 2019-01-09 |
| 3 | Rain | 2019-01-10 |
| 4 | Eric | 2019-01-11 |
| 5 | John | 2019-01-12 |
+----+------+---------------+
5 rows in set (0.00 sec) mysql>
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