JDBC - Java에서 업데이트 내역 로그 테이블 만들기

Question

JDBC를 통해 내가 테이블에서 수행하는 모든 업데이트의 내역을 만들어야합니다. 예를 들어 제품 테이블이 있는데, 이름 열에서 업데이트를 수행하는 경우이 변경 사항을 기록 테이블에 기록해야하지만 다음 데이터 만 필요합니다. 테이블 이름, 열 이름 및 업데이트 후 내용 앞에이 열의 내용 JDBC (Java)를 사용합니다.

예 테이블 제품 같은

productid|name  |value 
1  |computer |1000 

updated 
productid|name  |value 
1  |mouse  |10 

product log history 
table = product 
columnBefore name = computer 
columnAfter name = mouse 
columnBefore value = 1000 
columnAfter value = 10 

뭔가. 어디서부터 시작해야할지 모르겠다 어떤 생각을 하시겠습니까?

Answer 1

최대 절전 모드를 사용하는 경우, 인터셉터를 시작할 수 있습니다. 당신은 당신의 목적을 위해 아래의 메소드를 오버라이드 할 수 있습니다.

추출 된 메소드는 시나리오에 필요한 인터셉터 인터페이스에 속합니다.

/** 
* Called just before an object is initialized. The interceptor may change the <tt>state</tt>, which will 
* be propagated to the persistent object. Note that when this method is called, <tt>entity</tt> will be 
* an empty uninitialized instance of the class. 
* 
* @return <tt>true</tt> if the user modified the <tt>state</tt> in any way. 
*/ 
public boolean onLoad(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) throws CallbackException; 

/** 
* Called when an object is detected to be dirty, during a flush. The interceptor may modify the detected 
* <tt>currentState</tt>, which will be propagated to both the database and the persistent object. 
* Note that not all flushes end in actual synchronization with the database, in which case the 
* new <tt>currentState</tt> will be propagated to the object, but not necessarily (immediately) to 
* the database. It is strongly recommended that the interceptor <b>not</b> modify the <tt>previousState</tt>. 
* 
* @return <tt>true</tt> if the user modified the <tt>currentState</tt> in any way. 
*/ 
public boolean onFlushDirty(Object entity, Serializable id, Object[] currentState, Object[] previousState, String[] propertyNames, Type[] types) throws CallbackException; 

/** 
* Called before an object is saved. The interceptor may modify the <tt>state</tt>, which will be used for 
* the SQL <tt>INSERT</tt> and propagated to the persistent object. 
* 
* @return <tt>true</tt> if the user modified the <tt>state</tt> in any way. 
*/ 
public boolean onSave(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) throws CallbackException; 

/** 
* Called before an object is deleted. It is not recommended that the interceptor modify the <tt>state</tt>. 
*/ 
public void onDelete(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) throws CallbackException; 

/** 
* Called before a flush 
*/ 
public void preFlush(Iterator entities) throws CallbackException; 

/** 
* Called after a flush that actually ends in execution of the SQL statements required to synchronize 
* in-memory state with the database. 
*/ 
public void postFlush(Iterator entities) throws CallbackException;