mysql--sqlalchemy.exc.IntegrityError: (IntegrityError) (1215, ‘Cannot add foreign key constraint‘ 技术标签: mysql无法添加外键约束 搜到的有数据类型不匹配(我这并不是这个问题) 建议检查表对应外键的属性在本表的定于是否有unquie的属性 name = db.Column(db
Python之sqlalchemy错误:pymysql.err.IntegrityError) (1215, 'Cannot add foreign key constraint'),程序员大本营,技术文章内容聚合第一站。
sqlalchemy.exc.IntegrityError: (IntegrityError) (1451, 'Cannot delete or update a parent row: a foreign key constraint fails (`ooxx`.`friendship`, CONSTRAINT `friendship_ibfk_1` FOREIGN KEY (`user_id1`) REFERENCES `user` (`id`))') 'DELETE FROM user WHERE user.age 原因是删除 user 表的...
sqlalchemy.exc.NoForeignKeysError: Could not determine join condition between parent/child tables on relationship Father.son - there are no foreign keys linking these tables. Ensure that referencing columns are associated with a ForeignKey or ForeignKeyConstraint, or specify a 'primaryjoin' expression ...
ALTER TABLE pc ADD CONSTRAINT fk_cpu_model FOREIGN KEY (cpumodel) REFERENCES parts(model); 第一行是说要为pc表设置外键,给这个外键起一个名字叫做fk_cpu_model;第二行是说将本表的cpumodel字段设置为外键;第三行是说这个外键受到的约束来自于parts表的model字段。
问SQLAlchemy:多个ForeignKeyConstraint引用同一目标列ENSQLALCHEMY采用adjacency list pattern来表示类的自引用...
mysql--sqlalchemy.exc.IntegrityError: (IntegrityError) (1215, 'Cannot add foreign key constraint' 今天在使用mysql时遇到的问题,最后发现问题是,数据类型与外键数据类型不同,改正过来就没有问题了。
sqlalchemy.exc.NoForeignKeysError:Couldnotdeterminejoinconditionbetweenparent/childtablesonrelationshipversion_patch.patchcode-therearenoforeignkeyslinkingthesetables.EnsurethatreferencingcolumnsareassociatedwithaForeignKeyorForeignKeyConstraint,orspecifya'primaryjoin'expression. 代码: classtrans_inst(db.Model): __tabl...
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 rowinset (0.00sec) mysql> select *fromstu...
( UniqueConstraint(ip,port,name='uix_ip_port'), Index('ix_id_sname',id,sname) ) #一对一:一种角色只能管理一条业务线,一条业务线只能被一种角色管理 class Role(Base): __tablename__='role' id=Column(Integer,primary_key=True,autoincrement=True) rname=Column(String(32),nullable=False,...