Spring boot uses jpa to operate MySQL InnoDB; for example: products; id; quantity; ; id=3211: I see the sql statement on the Internet is: SET AUTOCOMMIT=0; BEGIN WORK; SELECT quantity FROM products WHERE id=3 FOR UPDATE; UPDATE products SET quan...
original https: www.cnblogs.com rensh. when data is returned I have tried my code for N times and all returned { "code ": 1, "msg ": "this id must be passed ", "data ": data } cannot be returned at all unless it is returned directly, but t...
and input parameters use @ RequestBody annotations ...
the task performed every minute is to query the data with a status of 1 from the database, and update the data (related tables) if it exists, otherwise it will not be processed, such a simple scheduled task, but will this execution per minute affect perf...
encountered a project, there is a SpringBoot background, the terminal is an embedded chip, the data exchange between the two is required to be binary. Contact with this requirement for the first time, unlike the previous interaction with the mobile phone...
for example, ask for documents that can be run by combining springboot2 with mysql and mongodb at the same time ...
such as the title. background controller: @RequestMapping("generatorOrder") public TMessage generatorOrder(Order order) { ... } order class: public class Order implements Serializable { private Long orderId; ...
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...
when I actually use it, it s not what the documentation says. my thymeleaf version The code calls the tostring method of the class in this way <script> console.log([[${games}]]) < script> chorme console: an error will be prompted, b...
thymeleaf 2.+ requires < script th:inline= "javascript " > declare this Is there a better way after thymeleaf3? can the declaration be omitted? I read the document saying that it is recommended to remove . Template updates remove any th:inline= ...
Springboot application visits database. Error: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any enter the con...
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...
use springBootTest for unit test. The unit test code is as follows. @ SpringBootTest annotation scans all components, including @ Aspect annotated components. Note 1 is a service and performs database operations @RunWith(SpringJUnit4ClassRunner.cla...
@Bean public HttpMessageConverters fastJsonHttpMessageConverters() { 1convert FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter(); 2fastjsonjson; FastJsonConfig fastJsonConfig = new Fast...
learn the problems encountered when the converter: now the time to convert the String format sent from the foreground into the date format, the converter only specifies the format before conversion string and the format after conversion date, but the fo...
use IDEA s Spring Initializr to initialize Spring-Boot project defaults to application.properties as configuration file, and I want to use yml . After I create a new application.yml under resource , as shown below. The yml file has no input...
such as the title. such as the title. such as the title. ...
I am a java rookie, ask some rookie questions? use spring-boot to develop projects, spring-data-jpa to access databases, there are many fields in the database, but only some of them are used by the client, while the data needed by the background is ...
how does SpringBoot access the page? I returned the string "login " at controller. It didn t access the login.html page. Do I need to add thymeleaf dependencies? ...
the image of centos7 starting springboot always indicates that the port is occupied, but I m pretty sure that the port is not occupied, and the other port is still occupied which god knows what s going on ...
as described in the title ...
how to select the first element of the same class? <!DOCTYPE html> <html> <head> <style> .test:nth-of-type(1) { background:-sharpff0000; } < style> < head> <body> <h1>< h1> <p class="tes...
when typing in Chinese and English in excel, there is often a lot of blank space on one line, but the line wraps automatically. Could you tell me how to set it up? ...
to briefly describe the scene, there are three pages of Agraine BMagol C. On page B, when the user presses return, the pop-up box confirms whether to return, click to return to A, click No to make no changes, page C cannot return to page B. at present, ...
after setting the element to a draggable state using css s -webkit-app-region: drag in electron, it is found that double-clicking on the element triggers the maximization method of the system, try to use js to disable double-click and click events o...