1. Caching

CacheManager: Manage various components;

Cache: The interface that actually operates the buffer;

@Cacheable: cacheable, if labeled in a method, then the return result of this method will be cached;

@CacheEvict: Empty the cache, when a user is deleted, the deleted method is marked above, then the user's cache will be deleted;

@CachePut: Update the cache, update a user, labeling in the updated method, the characteristics of this method of prestige, ensure that the method will be called, and the results will be cached;

@EnableCaching: Enable annotation-based caching;

Keygenerator: Key generation strategy when caching data;

Serialize: The cached data is the value serialization policy;

1. Basic Environment Construction

Import: Web, Cache, MySQL, MyBatis module;

Create a new Spring_cache database, import the following SQL file and import it directly: (Note:linux mysql default is to distinguish table name casing )

/*Navicat MySQL Data transfersource Server: Local source server Version:50528source host:127.0.0.1:33         06Source database:springboot_cachetarget Server type:mysqltarget server Version:50528file Encoding : 65001date:2018-04-27 14:54:04*/SETForeign_key_checks=0;-- ------------------------------Table Structure for department-- ----------------------------DROP TABLE IF EXISTS' department ';CREATE TABLE' Department ' (' ID ')int( One) not NULLauto_increment, ' Departmentname 'varchar(255)DEFAULT NULL,  PRIMARY KEY(' id ')) ENGINE=InnoDBDEFAULTCHARSET=UTF8;-- ------------------------------Table structure for employee-- ----------------------------DROP TABLE IF EXISTS' employee ';CREATE TABLE' employee ' (' ID ' )int( One) not NULLauto_increment, ' LastName 'varchar(255)DEFAULT NULL, ' email 'varchar(255)DEFAULT NULL, ' Gender 'int(2)DEFAULT NULL, ' d_id 'int( One)DEFAULT NULL,  PRIMARY KEY(' id ')) ENGINE=InnoDBDEFAULTCHARSET=UTF8;

View Code

Application.properties:

View Code

Bean:

 PackageCom.ning.cache.bean; Public classDepartment {PrivateInteger ID; PrivateString Departmentname;  PublicDepartment () {Super(); //TODO auto-generated Constructor stub    }     PublicDepartment (Integer ID, String departmentname) {Super();  This. ID =ID;  This. Departmentname =Departmentname; }     PublicInteger getId () {returnID; }     Public voidsetId (Integer id) { This. ID =ID; }     PublicString Getdepartmentname () {returnDepartmentname; }     Public voidsetdepartmentname (String departmentname) { This. Departmentname =Departmentname; } @Override PublicString toString () {return"Department [id=" + ID + ", departmentname=" + Departmentname + "]"; }                }

View Code

 PackageCom.ning.cache.bean; Public classEmployee {PrivateInteger ID; PrivateString LastName; PrivateString Email; PrivateInteger gender;//Sex 1 Male 0 female    PrivateInteger did;  PublicEmployee () {Super(); }         PublicEmployee (integer ID, string lastName, string email, integer gender, Integer did) {Super();  This. ID =ID;  This. LastName =LastName;  This. email =email;  This. Gender =gender;  This. did =Did ; }         PublicInteger getId () {returnID; }     Public voidsetId (Integer id) { This. ID =ID; }     PublicString Getlastname () {returnLastName; }     Public voidsetlastname (String lastName) { This. LastName =LastName; }     PublicString Getemail () {returnemail; }     Public voidsetemail (String email) { This. email =email; }     PublicInteger Getgender () {returngender; }     Public voidSetgender (Integer gender) { This. Gender =gender; }     PublicInteger Getdid () {returnDid ; }     Public voidSetdid (Integer did) { This. did =Did ; } @Override PublicString toString () {return"Employee [id=" + ID + ", lastname=" + LastName + ", email=" + email + ", gender=" + Gender + ", did=" + DI D + "]"; }        }

View Code

The Mapper interface is as follows:

 PackageCom.ning.cache.mapper;ImportCom.ning.cache.bean.Employee;Importorg.apache.ibatis.annotations.*; @Mapper Public Interfaceemployeemapper {@Select ("SELECT * from Employee where Id=#{id}")     PublicEmployee Getempbyid (Integer ID); @Update ("Update employee set Lastname=#{lastname},email=#{email},gender=#{gender},d_id=#{did} where Id=#{id}")     Public voidupdateemp (employee employee); @Delete ("Delete from employee WHERE id = #{id}")     Public voidDeleteempbyid (Integer ID); @Insert ("INSERT into employee (LASTNAME,EMAIL,GENDER,D_ID) VALUES (#{lastname},#{email},#{gender},#{did})")     Public voidInsertemployee (employee employee);}

View Code

The service is as follows:

 PackageCom.ning.cache.service;ImportCom.ning.cache.bean.Employee;ImportCom.ning.cache.mapper.EmployeeMapper;Importorg.springframework.beans.factory.annotation.Autowired;ImportOrg.springframework.stereotype.Service; @Service Public classEmpservice {@Autowired employeemapper employeemapper;  PublicEmployee getemp (Integer ID) {Employee EMP=Employeemapper.getempbyid (ID);        SYSTEM.OUT.PRINTLN (EMP); returnEMP; }}

View Code

The controller is as follows:

 PackageCom.ning.cache.controller;ImportCom.ning.cache.bean.Employee;ImportCom.ning.cache.service.EmpService;Importorg.springframework.beans.factory.annotation.Autowired;ImportOrg.springframework.stereotype.Controller;Importorg.springframework.web.bind.annotation.GetMapping;Importorg.springframework.web.bind.annotation.PathVariable;Importorg.springframework.web.bind.annotation.RequestMapping;ImportOrg.springframework.web.bind.annotation.RestController; @RestController//synthetic annotations of @RequestMapping and @controller Public classEmpcontroller {@Autowired empservice empservice; @GetMapping ("/emp/{id}")//gets the ID parameter of the GET request     PublicEmployee getemp (@PathVariable ("id") Integer ID) {//Remove the value of the ID placeholder from the PATH variableEmployee emp =empservice.getemp (ID); returnEMP; }}

View Code

The test classes are as follows:

 PackageCom.ning.cache;ImportCom.ning.cache.bean.Employee;ImportCom.ning.cache.mapper.EmployeeMapper;Importorg.junit.Test;ImportOrg.junit.runner.RunWith;Importorg.springframework.beans.factory.annotation.Autowired;Importorg.springframework.boot.test.context.SpringBootTest;ImportOrg.springframework.test.context.junit4.SpringRunner; the @RunWith (Springrunner.class) @SpringBootTest Public classspringboot01cacheapplicationtests {@Autowired employeemapper employeemapper; @Test Public voidcontextloads () {Employee emp= Employeemapper.getempbyid (1); System.out.println ("EMP =" +EMP); }}

View Code

Remarks: Injected into the project

@Autowired
Employeemapper Employeemapper;

When the report does not have this bean this is OK because the project has no reason to detect the bean.

Project structure

1. Caching