通過JDBC創建更新歷史記錄日志表-Java

Question

我需要創建我通過JDBC對表進行的所有更新的歷史記錄。 例如，我有一個產品表，如果我在名稱列中進行更新，則需要將此更改記錄在歷史表中，但是，僅以下數據； 表名，列名和內容此列在更新后的內容之前。 通過JDBC（Java）。

表格產品示例

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

這樣的事情。 我不知道從哪里開始？

Answer 1

如果您使用的是Hibernate，則可以從Interceptor開始。 您可以為自己的目的覆蓋以下方法。

我提取的方法屬於情景所需的Interceptor接口。

/**
 * 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;