mysql database Save the code as follows: : ...
xml file related configuration and error prompt Cannot resolve symbol classpath:. : properties: the runtime environment is dependent on tomcat7, data validation: <dependency> <groupId>javax.validation< groupId> ...
the test case cannot roll back the data and is inserted directly into the database? applicationContext.xml <context:annotation-config>< context:annotation-config> <!--dataSource--> <bean id="dataSource" class="org...
seniors, use SpringJPA for the first time. Now the entity class has a field that looks like this: private String movie_id; and I want to sort through this field. After inheriting PagingAndSortingRepository, the code is: Sort sort = new Sort(...
session.save (c) converts instantaneous objects into persistent objects, but the c object does not have a primary key. A primary key generation strategy is configured in the configuration file. When native, executes session.save (c), an insert statement...
Hibernate lazily loads the acquired entity class, which has been handled by javaassit. Now there is no time to study javaassit, wants to know how to get the original Class, of the entity class and the original attribute of the entity class and the Class ...
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< H2 > description: < H2 > there are 19 pieces of data in total. When using PageRequest.of (page, limit) for paging query, as long as the limit parameter is greater than 19, it is found to be empty. less than 19:00, function is normal. < H2 > Test C...
one class @Entity public class Shuo{ @Id @GeneratedValue private int id; private String title; private Date date; String content; @ManyToOne(cascade = CascadeType.REFRESH) @JoinColumn(name = "user_id") private User user; : @OneT...
cascading deletions are actually performed but in practice, it is this kind of pseudo deletion that creates flag and assigns 0,1 . is there a callback method that can handle the logic of deletion? Only in this way can we write custom delete logic h...
https: github.com thymeleaf . I use jpa, to cascade the two classes through annotations. in the html page, when you get the object of any class through the thymeleaf tag, it will appear . java.lang.StackOverflowError: null at sun.reflect.misc.Refl...
1. Recently, when I was learning hibernate, a question suddenly occurred to me: can I use hibernate instead of a database to store data? Can it cooperate with hibernate with simple file access? 2. In order to answer this question, I think we should fi...
examples of using wrapper classes on the hibernate official website, public class PersonWrapper { private final Long id; private final String nickName; public PersonWrapper(Long id, String nickName) { this.id = id; this.n...
this is the format of tcp messages on the Internet and in books. I just want to ask, is it the same in actual transmission? For example, the first part of tcp, with a total of 6 segments from top to bottom, is also juxtaposed with 6 segments during t...
A link like this, http: parse.a.cn parse files., is used in the picture: <img src="http: parse.a.cn parse files 1346a5839b91b5325e2ecec7c67ef975 086631de48a500600d1953e95b0ed695_file" > then a picture is displayed. has no suffix. W...
thinking about setting up a crawler to monitor the ticket release of 12306 fixed trains. it is normal to run after writing on my computer. The crawling frequency is not high. Climb every five minutes, and each time you climb for 8 days in turn. There i...
problem description RT, secondary setting rendering will turn the children into that component. No matter what level 3 is set, it has always been a rendering HelloWorld component. Is there something wrong with my configuration? related codes templ...
has N tables, indicating a string table1 , table2 , table3 . tableN . The fields of these tables are all the same. Now take out the same fields from these N tables. How should sql write? select field1,field2 from table1---tableN this N repre...