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`‎docs/system-design/framework/spring/SpringInterviewQuestions.md‎`

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`@@ -51,6 +51,8 @@ Spring 官网列出的 Spring 的 6 个特征:`
`51`	`51`	`- Spring Web : 为创建Web应用程序提供支持。`
`52`	`52`	`- Spring Test : 提供了对 JUnit 和 TestNG 测试的支持。`
`53`	`53`
	`54`	`+`
	`55`	`+`
`54`	`56`	`## 谈谈自己对于 Spring IoC 和 AOP 的理解`
`55`	`57`
`56`	`58`	`### IoC`
`@@ -276,7 +278,43 @@ public OneService getService(status) {`
`276`	`278`
`277`	`279`	当`@Transactional`注解作用于类上时,该类的所有 public 方法将都具有该类型的事务属性,同时,我们也可以在方法级别使用该标注来覆盖类级别的定义。如果类或者方法加了这个注解,那么这个类里面的方法抛出异常,就会回滚,数据库里面的数据也会回滚。
`278`	`280`
`279`		-在`@Transactional`注解中如果不配置`rollbackFor`属性,那么事物只会在遇到`RuntimeException`的时候才会回滚,加上`rollbackFor=Exception.class`,可以让事物在遇到非运行时异常时也回滚
	`281`	+在`@Transactional`注解中如果不配置`rollbackFor`属性,那么事物只会在遇到`RuntimeException`的时候才会回滚,加上`rollbackFor=Exception.class`,可以让事物在遇到非运行时异常时也回滚。
	`282`	`+`
	`283`	`+## 如何使用JPA在数据库中非持久化一个字段?`
	`284`	`+`
	`285`	`+假如我们有有下面一个类:`
	`286`	`+`
	`287`	+```java
	`288`	`+Entity(name="USER")`
	`289`	`+public class User {`
	`290`	`+`
	`291`	`+ @Id`
	`292`	`+ @GeneratedValue(strategy = GenerationType.AUTO)`
	`293`	`+ @Column(name = "ID")`
	`294`	`+ private Long id;`
	`295`	`+`
	`296`	`+ @Column(name="USER_NAME")`
	`297`	`+ private String userName;`
	`298`	`+`
	`299`	`+ @Column(name="PASSWORD")`
	`300`	`+ private String password;`
	`301`	`+`
	`302`	`+ private String secrect;`
	`303`	`+`
	`304`	`+}`
	`305`	+```
	`306`	`+`
	`307`	+如果我们想让`secrect` 这个字段不被持久化,也就是不被数据库存储怎么办?我们可以采用下面几种方法:
	`308`	`+`
	`309`	+```java
	`310`	`+static String transient1; // not persistent because of static`
	`311`	`+final String transient2 = "Satish"; // not persistent because of final`
	`312`	`+transient String transient3; // not persistent because of transient`
	`313`	`+@Transient`
	`314`	`+String transient4; // not persistent because of @Transient`
	`315`	+```
	`316`	`+`
	`317`	`+一般使用后面两种方式比较多,我个人使用注解的方式比较多。`
`280`	`318`
`281`	`319`	`## 参考`
`282`	`320`

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