Enable Second level Cache in Hibernate Annotation
January 29, 2013
Enable Hibernate Second Level Cache Globally
We need to set a property in our persistence configuration file. The property is hibernate.cache.default_cache_concurrency_strategy. By setting this property, all tables can be cached at second level.Enable Hibernate Second Level Cache at Table Level by Annotation
In Hibernate Annotation, we use @Cache to set table level cache. We also need to set @Cacheable. The class CacheConcurrencyStrategy of the package org.hibernate.annotations, provides the caching.
@Entity
@Table(name="college")
@Cacheable
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class College implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Column(name="college_id")
private int collegeId;
@Column(name="name")
private String collegeName;
@ElementCollection
@CollectionTable(name="student", joinColumns=@JoinColumn(name="college_id"))
@Column(name="student_name")
private Set<String> students;
public College(int collegeId,String collegeName){
this.collegeId=collegeId;
this.collegeName=collegeName;
}
public Set<String> getStudents() {
return students;
}
public void setStudents(Set<String> students) {
this.students = students;
}
public int getCollegeId() {
return collegeId;
}
public void setCollegeId(int collegeId) {
this.collegeId = collegeId;
}
public String getCollegeName() {
return collegeName;
}
public void setCollegeName(String collegeName) {
this.collegeName = collegeName;
}
}
Enable Hibernate Second Level Cache at Column Level by Annotation
In Hibernate Collections to cache the collection at column level @Cache is used and CacheConcurrencyStrategy class provides the caching. We need to set it at property level in our entity.
@ElementCollection
@CollectionTable(name="student", joinColumns=@JoinColumn(name="college_id"))
@Column(name="student_name")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
private Set<String> students;
