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...
where = order by order asc. the tables in my database are originally arranged and read in order but the order is out of order after adding asc and do not understand what the author intends ...
the addresses I found through Baidu search are incomplete, such as https: codeshelper.com a 11. ellipsis is not the same as the one opened. Ask the I requested through the search interface. ...
I just started to learn that python, has two functions, one is to get the value of cookie of the website, and the other is to send a get request. Why can t I use this variable a? how can I use the value of a? direct print is valuable and I use multithr...
JD.com s pen question input sample: string A: ababcb string B: xyx the substring aba,bab,bcb of substring An is equivalent to the shape of string B. We are asking to find out how many substrings in An are equivalent to string B. (obviously, the le...
< H2 > Environment < H2 > win10 Professional enable hyper-v install "docker for windows installer.exe " < H2 > data < H2 > hyper-v Manager mobyLinuxVM power shell dockerdocker-machine.exe ip hyper-vmobyLinuxVM Why published ip i...