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...
now we need to develop a website to generate front-end pages based on the node ID saved in the database. For example, the json data is: let data=[ {"id":1,"pid":0,"type":"div"}, {"id":2,"pi...
problem description the system wants to limit the number of posts posted by newly registered users or prevent malicious comments the environmental background of the problems and what methods you have tried generally speaking, browsing comments are...
$tpl = [ a , b , c , d , ]; $value = hello ; how to generate the following in code? $arr[ a ][ b ][ c ][ d ] = $value; ...
configure swagger Why many blogs can access web pages directly by configuring swagger configuration, and why do I need to configure this to access springboot version using the latest version 2.0.6 and 2.9.2 @Configuration public class SpringMvcConfig ...
1. The value is passed in the two controller (controller), and with the help of the third common controller (the parent controller), the result is that the event broadcast downwards in the parent controller is not available from the controller. 2. The ...