Find some important knowledge points and answers for Spring and hibernate!

1 Learn to use.

2 Ask why.

Upstairs ggs, don't mislead people. Also ssh....H stands for HibernateAnd now the companies I've been to rarely use SSH anymore. Mostly ssh2

Same with me. At first, I didn't feel anything after learning it twice at first.

1.Find out what the two of them do.

Benefits of using it:

You can search for this or have it in books. And they don't belong to the same concept. There will be no problem distinguishing between them. You've had the foundation.

2.Go and do something simple with integrations. The main thing is to be able to integrate without errors, I think you will be a lot clearer. If you haven't done it. Then it's okay to find some simple examples. There are many on books or online.

It's all relatively basic. And you've learned. I believe you only need to do it once and you should be able to understand.

It's all about the merits.

spring

Advantages: Reduces "new", saves memory data, and destroys the source.

Disadvantages: I am not familiar with spring, and the disadvantages are not easy to say. I feel that the configuration file has to be written a lot, which is very troublesome (maybe my level problem).

hibernate

Advantages: The direct operation is on the object, and the operation on the database is done by hibernate.

You capitalize the first letter of the word datasource, and spring doesn't recognize it.

Hibernate is a framework for a data persistence layer that manages how to access and manipulate data in a database.

Spring is a more powerful framework that provides integration for J2EE application development in terms of simplicity, testability, and loose coupling, as well as support for section-oriented programming.

To use a simple analogy, Hibernate is the warehouse manager of the warehouse, who is responsible for the storage management of goods.

Spring is the core leader of the management and is responsible for coordinating the scheduling to ensure the good functioning of the enterprise.

In a nutshell, Spring provides a number of services that are often used, such as AOP to manage things, the core is IOC control inversion, it can be integrated with many open source frameworks, Spring is mainly used for the business logic layer, and allows the presentation and persistence layers to work better together.

Hibernate is an ORM framework that is an object-relational model, which can transform the object model into a relational model, which used to be relation-oriented when designing databases, through Hibernate you can design databases with object-oriented ideas, so that you can operate databases more conveniently, I think Hibernate is a great ORM framework.

Spring can be integrated with Hibernate, so that sessions can be managed by Spring, and Spring's AOP can be used to manage things.

First of all, it is recommended that when you define the bean, use the first letter of the id attribute value in lowercase, that is, change NewUserDAO to NewUserDAO

Then you check that your package path is correct. You go to your project Wentong ruler folder, find the Tanxiao web directory, and then look at the directory structure under the web-inf classes directory to see if there is a dao folder, and whether there is a document bureau letter height under the folder.

If not, then the mistake is certain.

Spring and Hibernate integration pay attention to some conflicts, it is not difficult, go to the official website to see the manual.

You can't do the computer test questions of the North Bird, so you can go home and farm.