当前位置:网站首页>SSM assembly
SSM assembly
2022-07-06 02:15:00 【hjhcos】
List of articles
brief introduction
SSM The assembly is Spring + SpringMVC + MyBatis Integration of the framework , Divide the system into view layers 、 Control layer 、 Service layer 、 The data layer .
controller The controller will be used service service ;service The service will be used mapper Data mapping and converting data into domain Data objects ;mapper Data mapping will be used domain Define data types .
entity: Data objects , It can reduce the data processing process .
model: stay entity On the basis of improvement , Make the data more humanized .
domain: stay model Expand and integrate data sources based on , It can enrich data and diversify .
Controller registration
adopt @Controller and @RestController Annotations can automatically register the controller into the project , Pass again like this @RequestMapping Annotations can map requests , Generally, you can access pages or data .
By the way @RestController = @Controller + @ResponseBody, Its source code is basically the same .
The controller is scanned
When class is used @Controller To register the controller and be able to Spring Application scanning can be divided into two cases :
External dependencies are referenced into the project
You can probably understand that when the controller is not in the current project , But in the dependency package of the project , for example SpringSecurity Default login page , It is referenced through external modules .
And Spring Application startup class peer automatic scanning
spring-boot-starter-web
file :https://www.yiibai.com/spring-boot/spring-boot-starter-web.html
spring-boot-starter-web The integration package includes web、webmvc and tomcat .
therefore tomcat The server and Spring MVC The framework is automatically configured , Greatly reduce the amount of development .
If you want to configure the server yourself , Can also be spring-boot-starter-tomcat Exclude items from use tomcat The server .
mybatis-spring-boot-starter
mybatis-spring-boot-starter Integration package is right MyBatis + MyBatis-Spring + SpringBoot Integrated packaging of , Therefore, it is highly dependent , But it greatly reduces the amount of development , You don't have to configure SqlSessionFactory And transaction processing .
function
Automatically discover existing data sources
utilize SqlSessionFactoryBean Create and register SqlSessionFactory
Create and register SqlSessionTemplate
Automatic scanning Mapper, And register to the Spring Context environment facilitates the injection and use of programs
By default, it will find @Mapper Annotation marker mapper , In addition, you can actually pass @MapperScan Annotations to scan packages .
MyBatis
MyBatis Is an excellent persistence layer framework , It supports customization SQL、 Stored procedures and high-level mappings .MyBatis It dispenses with almost everything JDBC Code and the work of setting parameters and getting result sets .MyBatis It can be done by simple XML Or annotations to configure and map primitive types 、 Interface and Java POJO(Plain Old Java Objects, Ordinary old-fashioned Java object ) For records in the database .
SqlSession
SqlSessions By SqlSessionFactory Instance created .SqlSessionFactory Object contains create SqlSession Examples of various methods . and SqlSessionFactory Itself is made up of SqlSessionFactoryBuilder Created , It can come from XML、 Note or Java Configure code to create SqlSessionFactory.
XML mapper
The element tag
label | describe |
---|---|
cache | Cache configuration of namespace |
cache-ref | Cache configuration referring to other namespace |
resultMap | Describes how to load objects from a database result set |
sql | sql sentence , A block of repeatable terms that can be referenced by other statements |
insert | Mapping insert statements |
update | Mapping update statements |
delete | Mapping delete statements |
select | Mapping query statements |
Element attributes
attribute | value | The default value is | scene | describe |
---|---|---|---|---|
id | string | —— | [select | update |
parameterType | object | unset | [select | update |
resultType | object | —— | [select | update |
resultMap | object | —— | [select | update |
flushCache | boolean | false | [select | update |
useCache | boolean | true | select | If this statement is called, the result will be cached by the L2 cache . |
timeout | int | unset | [select | update |
fetchSize | int | unset | [select | update |
resultOrdered | boolean | false | [select] | If true, It is assumed that nested result sets or groups are included , When a main result row is returned , There is no reference to the previous result set . This makes it possible to get nested result sets without running out of memory . |
resultSets | [object…] | —— | [select] | This setting only applies to multiple result sets . It will list the result sets returned after the statement is executed and give each result set a name , Multiple names are separated by commas . |
useGeneratedKeys | boolean | false | [insert | update] |
keyProperty | string | unset | [insert | update] |
keyColumn | string | —— | [insert | update] |
\
边栏推荐
- vs code保存时 出现两次格式化
- PHP campus movie website system for computer graduation design
- Ali test Open face test
- [eight part essay] what is the difference between unrepeatable reading and unreal reading?
- Selenium waiting mode
- 【coppeliasim】高效传送带
- Formatting occurs twice when vs code is saved
- Redis key operation
- [flask] official tutorial -part2: Blueprint - view, template, static file
- Leetcode sum of two numbers
猜你喜欢
1. Introduction to basic functions of power query
Computer graduation design PHP animation information website
2022 PMP project management examination agile knowledge points (8)
Extracting key information from TrueType font files
TrueType字体文件提取关键信息
Derivation of Biot Savart law in College Physics
MySQL lethal serial question 1 -- are you familiar with MySQL transactions?
The ECU of 21 Audi q5l 45tfsi brushes is upgraded to master special adjustment, and the horsepower is safely and stably increased to 305 horsepower
Computer graduation design PHP college student human resources job recruitment network
Pangolin Library: subgraph
随机推荐
Global and Chinese market of commercial cheese crushers 2022-2028: Research Report on technology, participants, trends, market size and share
插卡4G工业路由器充电桩智能柜专网视频监控4G转以太网转WiFi有线网速测试 软硬件定制
Selenium waiting mode
[flask] official tutorial -part2: Blueprint - view, template, static file
The ECU of 21 Audi q5l 45tfsi brushes is upgraded to master special adjustment, and the horsepower is safely and stably increased to 305 horsepower
GBase 8c数据库升级报错
Computer graduation design PHP part-time recruitment management system for College Students
Genius storage uses documents, a browser caching tool
[eight part essay] what is the difference between unrepeatable reading and unreal reading?
Concept of storage engine
National intangible cultural heritage inheritor HD Wang's shadow digital collection of "Four Beauties" made an amazing debut!
leetcode-2. Palindrome judgment
1. Introduction to basic functions of power query
Computer graduation design PHP campus restaurant online ordering system
Method of changing object properties
阿里测开面试题
Global and Chinese markets for single beam side scan sonar 2022-2028: Research Report on technology, participants, trends, market size and share
Extracting key information from TrueType font files
729. My schedule I / offer II 106 Bipartite graph
leetcode3、实现 strStr()