entitylisteners在jpa中使用,如果你是mybatis是不可以用的
对实体属性变化的跟踪,它提供了保存前,保存后,更新前,更新后,删除前,删除后等状态,就像是拦截器一样,你可以在拦截方法里重写你的个性化逻辑。
/** * 数据建立与更新. */ public interface dataentity { timestamp getdatecreated(); void setdatecreated(timestamp datecreated); timestamp getlastupdated(); void setlastupdated(timestamp lastupdated); long getdatecreatedon(); void setdatecreatedon(long datecreatedon); long getlastupdatedon(); void setlastupdatedon(long lastupdatedon); }
@slf4j @component @transactional public class dataentitylistener { @prepersist public void prepersist(dataentity object) throws illegalargumentexception, illegalaccessexception { timestamp now = timestamp.from(instant.now()); object.setdatecreated(now); object.setlastupdated(now); logger.debug("save之前的操作"); } @postpersist public void postpersist(dataentity object) throws illegalargumentexception, illegalaccessexception { logger.debug("save之后的操作"); } @preupdate public void preupdate(dataentity object) throws illegalargumentexception, illegalaccessexception { timestamp now = timestamp.from(instant.now()); object.setlastupdated(now); logger.debug("update之前的操作"); } @postupdate public void postupdate(dataentity object) throws illegalargumentexception, illegalaccessexception { logger.debug("update之后的操作"); } @preremove public void preremove(dataentity object) { logger.debug("del之前的操作"); } @postremove public void postremove(dataentity object) { logger.debug("del之后的操作"); } }
@entitylisteners(dataentitylistener.class) public class product implements dataentity { @override public timestamp getdatecreated() { return createtime; } @override public void setdatecreated(timestamp datecreated) { createtime = datecreated; } @override public timestamp getlastupdated() { return lastupdatetime; } @override public void setlastupdated(timestamp lastupdated) { this.lastupdatetime = lastupdated; } @override public long getdatecreatedon() { return createon; } @override public void setdatecreatedon(long datecreatedon) { createon = datecreatedon; } @override public long getlastupdatedon() { return lastupdateon; } @override public void setlastupdatedon(long lastupdatedon) { this.lastupdateon = lastupdatedon; } }
上面代码将实现在实体保存时对createtime
,lastupdatetime
进行赋值,当实体进行更新时对lastupdatetime
进行重新赋值的操作。
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