select t.* from talk t where t.user_id = 2 Union select t.* from talk t, user_contact c where c.user_id = 2 and c.contact_type = 1 and c.be_user_id = t.user_id you can write it this way, but you don t want to write it this way. You want to use an inner...
ordinary subclasses inherit the parent class through the extends keyword, so how do the Spring parent container and the Spring MVC child container reflect the parent-child relationship? does the container refer to a class? which class is the Spring co...
looked at the information on the Internet and said that it was because the OPTIONS request could not carry a custom header request. Is this true? error message Failed to load http: 192.168.1.107:8066 talk queryList: Response to preflight request do...
the circuit breaker mechanism is enabled in zuul, and it takes a long time to set it up. After the backend returns successfully, zuul enters the fallback,. Excuse me, what s going on? the contents of the appliaction.yaml file are as follows spring: ...
first of all, ide idea,jdk 1.8 ide idea,jdk spring cloud version finchley sr5 successfully wrote and started the eurekaserver application according to the online tutorial: write client according to the online tutorial failed to start: client pom: ...
when fetch is used in the front end to make a request, the back end LocalDateTime serializes normally frontend request code com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.time.LocalDateTime out of START_...
InstantiationAwareBeanPostProcessor, about Spring calls its related interface before the bean object is instantiated, for example, interface: postProcessBeforeInstantiation about this interface, there is an explanation in the documentation: Apply th...
there is a utility class that needs to reference bean @Component class FooUtils implements InitializingBean { private static Foo foo; private static Bar bar; @Autowired private void foo(Foo foo) { MyFactory.foo = foo; } ...
for example @Configuration public class MyConfig{ @Resource(name = "ds1") DataSource ds1; @Bean(name="ds2") DataSource getDataSource(){ ... } @bean(name= "session ) Se...
executing the following sql, in a while loop will result in the non-execution indicated in the figure. Sql uses the version field to implement optimistic locks. @Transactional(rollbackFor = Exception.class) ...
the request header headers for front-end access carries token,. How can I transfer token to user into my method? the following is the result I want: User user is the user, transformed from token @PostMapping("add") @ResponseBody public Comm...
forgive me, WEB Xiaobai, to ask a simple question the front end is implemented using Angular6 + antd, and the back end uses the java front end to add data to the grid component as a pop-up antd modal form. The content part of the modal form (nzConte...
I want to get a common getUser static method so that I don t have to manually convert token to user in every controller public class UserUtil { @Autowired private static HttpServletRequest request; @Autowired private static HttpServle...
the company has built a Spring Cloud micro-service framework and now wants to provide a micro-service interface for executing sql statements. the question now is how to design better: 1. The interface parameters should contain the sql statement to be e...
problem description at present, the Rest API, built with SpringMVC in the project not only wants to be called by front-end Ajax, but also wants to be provided to a third party through HTTPClient. At the same time, third parties need to support securit...
2018-07-30 16:51:46,842 DEBUG [org.springframework.aop.aspectj.AspectJExpressionPointcut] - PointcutExpression matching rejected target method java.lang.NullPointerException at org.aspectj.weaver.ResolvedType.lookupResolvedMember(ResolvedType.java:62...
example ResponseBodyAdvice : @Order(1) @ControllerAdvice public class EncryptBodyAdvice implements ResponseBodyAdvice { @Override public boolean supports(MethodParameter returnType, Class converterType) { return returnType.getMethod()...
usually our home page routes are intercepted in this way @Controller @RequestMapping(" ") public class index { @RequestMapping(method = {RequestMethod.GET}) public ModelAndView index() { return new ModelAndView("view ind...
problem description online tutorials are usually modified like www.xxx.com index?lang=zh-CN. I want to make it like https: msdn.microsoft.com zh.. wants to avoid modifying the original controller as much as possible. ...
ContextLoader methods in the class the ApplicationContext of Spring in this picture has two subclasses WebApplicationContext and ConfragubleApplicationContext . What s the difference between them? ...
the previous command is as follows: mongod --logpath C: mydatabase logs.txt --logappend --dbpath C: mydatabase --serviceName MongoDB --install however, there is no prompt on the command line after entering the carriage enter, and the service has ...
The value of PHP md5 defaults to 32 bits. How to get 16 bits. On the Internet, there are a lot of characters that are intercepted by strings with 16 bits. Is this a reliable way? ...
Code snippet: Widget _ getRowWidget2 () { return new Row(children: <Widget>[ new Flexible( flex: 1, fit: FlexFit.tight, androidweight=1 child: new Stack(children: <Widget>[ new Column(children: <Widget>[ ...
how does the html page use js to download server mp3 files instead of opening them online for playback? ...
I encountered the problem of this pointing in the development. In addition to using the arrow function, I wondered if I could use bind to solve it. I made a mistake in binding when I used fn s suggested way of writing, using the traditional way of writ...