Hibernate二级缓存使用

逃离我推掉我的手 2022-05-18 04:11 296阅读 0赞

首先加入二级缓存的加入包（依赖）：

Maven中加入依赖：

<dependency>
               <groupId>org.hibernate</groupId>
               <artifactId>hibernate-ehcache</artifactId>
               <version>${hibernate.version}</version>
           </dependency>

若没有使用Maven构建项目则加入jar包：

![70][]

加入二级缓存的配置文件：

![70 1][]

在hibernate.cfg.xml配置文件中加入以下属性：

<property name="cache.use_second_level_cache">true</property>
    
        
    
        <property name="hibernate.cache.use_query_cache">true</property>
    
        
        <property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>
    
        
        <class-cache class="com.cache.entities.Employee" usage="read-write"/>

如果使用注解，也可以在实体类中使用注解开启需要使用二级缓存的实体类：

package com.cache.entities;
    
    import org.hibernate.annotations.CacheConcurrencyStrategy;
    
    import javax.persistence.*;
    import java.io.Serializable;
    import java.util.Date;
    
    @Cacheable
    @org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    @Table(name = "CACHE_EMPLOYEE")
    @Entity
    public class Employee implements Serializable {
    
        private Integer id;
    
        private String name;
    
        private String email;
    
        private Date birth;
    
        private Date createTime;
    
        private Department dept;
    
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        @Column(name = "EMP_ID")
        public Integer getId() {
            return id;
        }
    
        public void setId(Integer id) {
            this.id = id;
        }
    
        @JoinColumn(name = "DEPT_ID")
        @ManyToOne(targetEntity = Department.class,fetch = FetchType.LAZY)
        public Department getDept() {
            return dept;
        }
    
        public void setDept(Department dept) {
            this.dept = dept;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getEmail() {
            return email;
        }
    
        public void setEmail(String email) {
            this.email = email;
        }
    
        @Temporal(value = TemporalType.DATE)
        public Date getBirth() {
            return birth;
        }
    
        public void setBirth(Date birth) {
            this.birth = birth;
        }
    
        @Temporal(value = TemporalType.TIMESTAMP)
        public Date getCreateTime() {
            return createTime;
        }
    
        public void setCreateTime(Date createTime) {
            this.createTime = createTime;
        }
    
        @Override
        public String toString() {
            return "Employee{" +
                    "id=" + id +
                    ", name='" + name + '\'' +
                    ", email='" + email + '\'' +
                    ", birth=" + birth +
                    ", createTime=" + createTime +
                    ", dept=" + dept +
                    '}';
        }
    }

我使用的是hibernate5.2的版本，不知道为什么，我只在一的一端开启了类级别的缓存，去可以缓存到集合中多的一端的所有信息

[70]: /images/20220518/f0b6007be9d74a94bdfb9b546f495af9.png
[70 1]: /images/20220518/c85759cb9c6f44ae94730a3df6e0f708.png