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本篇文章為大家展示了怎么在Spring Boot中設置使用緩存,內(nèi)容簡明扼要并且容易理解,絕對能使你眼前一亮,通過這篇文章的詳細介紹希望你能有所收獲。
幾個緩存注解的作用:
@Cacheable:將方法的返回結果根據(jù)key指定的鍵保存在緩存中,以后要獲取相同的數(shù)據(jù)直接從緩存中共獲取
cacheNames/value:指定Cache組件名稱
key:指定緩存時使用的key,默認使用方法參數(shù)值,可以使用#a0、#p0、#參數(shù)名等,支持SpEL表達式,root可省略
keyGenerator:指定key的生成器的組件id,如自定義的KeyGenerator
cacheManager:指定緩存管理器
cacheResolver:指定緩存解析器
condition:指定在哪種條件下緩存,如condition = “#id>=1”在參數(shù)>=1時緩存
unless:指定該條件為真時不緩存
sync:指定是否使用異步模式
@CachePut:不管緩存中是否有需要的數(shù)據(jù),都會執(zhí)行該注解標注的方法,并將結果更新到緩存,屬性見上
@CacheEvit:執(zhí)行方法后,清除key指定的緩存
allEntries:默認為false,值為true,刪除所有緩存
beforeInvocation:默認為false,值為true,在方法調(diào)用之前清除緩存
@CacheConfig:定義一些通用或公共的規(guī)則,如cacheNames、keyGenerator等
可使用的SpEL表達式:
使用緩存的步驟:
(1)創(chuàng)建一個Spring Boot應用,勾選Cache、Web、MySQL、Mybatis模塊,在主程序類上添加注解,開啟基于注解的緩存
@MapperScan(basePackages = "com.youngpain.cache.mapper") @SpringBootApplication @EnableCaching
(2)創(chuàng)建JavaBean,和數(shù)據(jù)庫中的表對應,并配置數(shù)據(jù)源
spring: datasource: url: jdbc:mysql://localhost:3306/mybatis_database username: root password: 1741248769 driver-class-name: com.mysql.jdbc.Driver redis: host: 39.108.114.57 #開啟駝峰命名法 mybatis: configuration: map-underscore-to-camel-case: true logging: level: com.youngpain.cache.mapper: debug
(3)創(chuàng)建mapper接口進行增刪改查操作
/** * 部門表的增刪改查操作 */ public interface DepartmentMapper { @Insert("insert into department(id,depart_name,depart_build) values(#{id},#{depart_name},#{depart_build})") void insertDepartment(Department department); @Delete("delete from department where id=#{id}") void deleteDepartment(Integer id); @Update("update department set depart_name=#{departName},depart_build=#{departBuild} where id=#{id}") void updateDepartment(Department department); @Select("select * from department where id=#{id}") Department getDepartmentById(Integer id); }
(4)創(chuàng)建service
@Service @CacheConfig(cacheNames = {"departs"}) public class DepartmentService { @Autowired DepartmentMapper departmentMapper; @Cacheable(key = "#a0.id") public void insertDepartment(Department department) { departmentMapper.insertDepartment(department); } @CacheEvict(key = "#p0") public void deleteDepartment(Integer id) { departmentMapper.deleteDepartment(id); } @CachePut(key = "#a0.id") public Department updateDepartment(Department department) { departmentMapper.updateDepartment(department); return department; } @Cacheable(key = "#id", condition = "#p0>=1") public Department getDepartmentById(Integer id) { return departmentMapper.getDepartmentById(id); } }
(5)創(chuàng)建controller
@Controller public class DepartmentController { @Autowired DepartmentService departmentService; @GetMapping("/index") public String index() { return "index"; } @GetMapping("/deleteDepart/{id}") public String deleteDepart(@PathVariable("id") Integer id, Model model) { model.addAttribute("condition", "delete"); Department delete = departmentService.getDepartmentById(id); model.addAttribute("department", delete); departmentService.deleteDepartment(id); return "success"; } @PostMapping("/updateDepart") public String updateDepart(Department department, Model model) { model.addAttribute("condition", "update"); Department update = departmentService.updateDepartment(department); model.addAttribute("department", update); return "success"; } @GetMapping("/getDepart/{id}") public String getDepartmentById(@PathVariable("id") Integer id, Model model) { model.addAttribute("condition", "delete"); Department get = departmentService.getDepartmentById(id); model.addAttribute("department", get); return "success"; } }
(6)測試結果:
@Cacheable:第一次查詢數(shù)據(jù),控制臺發(fā)出sql語句,之后再查詢直接從緩存中獲取
@CachePut:調(diào)用方法修改某個數(shù)據(jù)后,再次查詢該數(shù)據(jù)是從緩存中獲取的更新后的數(shù)據(jù)
@CacheEvict:調(diào)用該方法后,再次查詢某個數(shù)據(jù)需要重新發(fā)出sql語句查詢
springboot一種全新的編程規(guī)范,其設計目的是用來簡化新Spring應用的初始搭建以及開發(fā)過程,SpringBoot也是一個服務于框架的框架,服務范圍是簡化配置文件。
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