Mybatis 攔截器

Mybatis定義了四種攔截器：

1. Executor (update, query, flushStatements, commit, rollback, getTransaction, close, isClosed)
2. ParameterHandler (getParameterObject, setParameters)
3. ResultSetHandler (handleResultSets, handleOutputParameters)
4. StatementHandler (prepare, parameterize, batch, update, query)

這四個類中的每一個方法都可以被攔截。

總體概括為：

1. 攔截執行器的方法
2. 攔截參數的處理
3. 攔截結果集的處理
4. 攔截Sql語法構建的處理

示例：

@Intercepts({@Signature(type= Executor.class,method = "update",args = {MappedStatement.class,Object.class})})
public class ExamplePlugin implements Interceptor {public Object intercept(Invocation invocation) throws Throwable {return invocation.proceed();}public Object plugin(Object target) {return Plugin.wrap(target, this);}public void setProperties(Properties properties) {}
}

xml配置：

<plugins><plugin interceptor="org.format.mybatis.cache.interceptor.ExamplePlugin"></plugin>
</plugins>

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