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    Onceuponatime,achildlesscouplelongedforababy.Buttheirwishnevercometrue.Andthereisagardenbehindtheirhouse.Oneday,thewifefoundaninvitinglettuceinthegarden.However,frightenedandtimid,thewifecouldn’tgetthislettucei
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    Howclearwasaday!Warmsunlightshoneonthesunwhiletheskywasastranquilandmysteriousassapphire.Irolledintheseahappily.Stillimmersinginhappiness,alargefishingnetcaughtmewhenIwasnotpayingattention.Hearingjoyfulvoice“bi
  • 2023-06-06Bean的循环依赖问题
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  • 2023-04-08如何理解单例模式?
    单例模式(SingletonPattern):采取一定的方法保证在整个的软件系统中,对某个类只能存在一个对象实例,并且该类只提供一个取得其对象实例的方法。通俗点来讲:就是一个男人只能有一个老婆,一个女人只能有一个老公单例模式一共有8种方式实现,下面一一举例:1、饿汉式(静态常量属性)实现步
  • 2023-02-19Hibernate annotation 联合主键
    Hibernateannotation联合主键  packagecom.hibernate.entity;importjava.io.Serializable;importjavax.persistence.Entity;importjavax.persistence.GeneratedValu
  • 2023-01-20python 字符串格式化
    一、%1#%d%f%s2#%ndn为位置的数量,n>0正数居右,n<0正数居左3#%f默认保留小数点后6位,%.nf,n为保留小数点后几位4print("%s有%2d个老婆,每个老婆要给%f两"%
  • 2022-10-17sqlalchemy.exc.noforeignkeyserror: could not determine join condition between parent/child tables on
    错误提示:sqlalchemy.exc.noforeignkeyserror:couldnotdeterminejoinconditionbetweenparent/childtablesonrelationshipwife.wife-therearenoforeignkey