JPA实体状态学习-(移除态:Removed)
今天继续学习JPA中实体的最后一种状态:移除态。还是先把图晒出来:按照名称进行猜想,移除态应该就是对象从数据库中删除以后,对象变成了不受持久化上下文管理的移除态。不过呢,这里有一点需要注意的是:什么样的对象才会进入进入移除态呢?变成移除状态的对象是调用persist()方法后,是像persist一样...
Vue 2属性插值: Interpolation inside attributes has been removed. Use v-bind or the colon shorthand instead.
Vue2在组件模板上使用双大括号{{}}对属性赋值:<divid="{{item.id}}"></div>报语法错误:Vuetemplatesyntaxerror:id="{{item.id}}":Interpolationinsideattributeshasbeenrem...
Getting a sprite to issue a message when it is removed from the scene after removefromParent?
IstheresomewayinSwiftthatIcantellwhenanSKSpriteNodehasactuallybeenremovedfromthescene?Idon'tthinkit'sactuallydonewhenremoveFromParentiscalled,butinste...
There are no resources that can be added or removed from the server
第1步、新建一个“DynamicWebProject” 第2步、把新建项目里面的.project文件和.settings文件夹复制到导入的那个项目里面。第3步、把webprojiectsetting里的root改一下。Therearenoresourcesthatcanbeaddedorremove...
学以致用三十一-----IPAddressField has been removed
python和django版本在进行makemigrations的时候报错设置的字段classServers(models.Model):'''服务器信息'''hostname=models.CharField(max_length=32,unique=True)ipaddr=models.IPAd...