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Article directory 1. Data transfer between front and back stations 2. Several common methods of interacting with database and returning data 3. Solutions of multiple buttons corresponding to one form 4. Form control and operation in HTML 5. Message frame message usage 6. Auto now, auto now add of Dat ...

1, IOC and DI IOC (reverse control): the creation of objects is handed over to spring for configuration. DI (dependency injection): sets values to properties in a class.Relationship between IOC and DI: DI cannot exist alone and needs to be completed on the basis of IOC. 2, Scope of Bean Singleto ...

Exception handling Error abnormal 1. Definition: errors detected at run time. 2. Phenomenon: when an exception occurs, the program will no longer execute downward, but will go to the call statement of the function. 3. Common types of exceptions: - name error: variable not defined. - type error: differen ...

Content: 1. What is one-time initialization? Example 1: one time initialization verification of pthread ﹣ once function: #include"stdio.h" #include"unistd.h" #include"sys/types.h" #include"pthread.h" #include"stdlib.h" #include"string.h" pthread_once_t once = PTHREAD_ONCE_INIT;//Declare global var ...

The new requirements need to make some customized things on log4j, so the log4j2 is supplemented To configure Let's look at the traditional configuration of log4j2 <?xml version="1.0" encoding="UTF-8"?> <Configuration status="WARN"> <properties> <property name="log_path"&gt ...

Parameter binding stay The fifth chapter Feign is used to implement a REST service binding without parameters. However, in the actual business, it is much more complicated than this. Different types of parameters are passed in at various locations of HTTP requests, and the returned parameters may als ...

Catalog Preface HashTable and ConcurrentHashMap data structure Class Segment attribute put(K key, int hash, V value, boolean onlyIfAbsent) remove(Object key, int hash, Object value) Class HashEntry attribute Construction method Core method put(K key, V value) get(Object key) size() remove(Object k ...

In web development, the separation of front and back development has been deeply rooted in the hearts of the people. Such a development mode is very useful for the development of elegant and beautiful web applications. I have consulted some materials on the Internet and learned to use the unified format ...

Starting with business applications, this paper abstracts a floating window tool class from scratch that can be used to display floating windows on any business interface.It can manage multiple floating windows at the same time, and floating windows can respond to touch events, can be dragged, and have side animations. The sample code is writt ...

Form operation Form scope modifier Number: converts the form value to a number data:{ inputmsg:'123' } <input type=text v-model.number="inputmsg">//The value of this form is output as data trim: remove spaces at the beginning and end of the form data:{ inputmsg:' 123 ' } <input ty ...