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這篇文章將為大家詳細(xì)講解有關(guān)在Spring框架中如何集成JPA實(shí)例，小編覺得挺實(shí)用的，因此分享給大家做個參考，希望大家閱讀完這篇文章后可以有所收獲。
Hibernate 3.2支持JPA注解，Spring集成JPA是可選的。
實(shí)體類MyUser，使用JPA注解實(shí)現(xiàn)到數(shù)據(jù)庫表myUser的映射，如下所示：
package org.shirdrn.entity; import java.util.Date; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Transient; @Entity
public class MyUser {private Long id; private String userName; private String password; private String gender; private Integer age; private Integer birthYear; private String addr; private String email; @Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public Long getId() {
return id;
}public void setId(Long id) {
this.id = id;
}@Column(name="userName")
public String getUserName() {
return userName;
}public void setUserName(String userName) {
this.userName = userName;
}@Column(name="password")
public String getPassword() {
return password;
}public void setPassword(String password) {
this.password = password;
}@Column(name="gender")
public String getGender() {
return gender;
}public void setGender(String gender) {
this.gender = gender;
}@Column(name="age")
public Integer getAge() {
return age;
}public void setAge(Integer age) {
this.age = age;
}@Column(name="addr")
public String getAddr() {
return addr;
}public void setAddr(String addr) {
this.addr = addr;
}@Column(name="email")
public String getEmail() {
return email;
}public void setEmail(String email) {
this.email = email;
}@Transient
public Integer getBirthYear() {
return new Integer(2008-age);
}public void setBirthYear(Integer age) {
this.birthYear = new Integer(2008-age);
}
} |
其中，birthYear不是數(shù)據(jù)庫中的字段，使用JPA的@Transient注解，在映射的時候，會忽略掉該成員。
持久層DAO接口如下：
package org.shirdrn.dao; import java.util.List; import org.shirdrn.entity.MyUser; import org.springframework.transaction.annotation.Transactional; @Transactional
public interface MyUserDAO {
public void createMyUser(MyUser myUser);
public void deleteMyUser(MyUser myUser);
public void updateMyUser(MyUser myUser);
public List |
這里，使用了JPA注解，聲明事務(wù)。
DAO實(shí)現(xiàn)類，如下所示：
package org.shirdrn.dao.impl; import java.util.List; import org.shirdrn.dao.MyUserDAO; import org.shirdrn.entity.MyUser; import org.springframework.orm.jpa.support.JpaDaoSupport; public class MyUserDAOImpl extends JpaDaoSupport implements MyUserDAO {public void createMyUser(MyUser myUser) {
getJpaTemplate().persist(myUser);
}public void deleteMyUser(MyUser myUser) {
MyUser dbMyUser = getJpaTemplate().find(MyUser.class, myUser.getId());
getJpaTemplate().remove(dbMyUser);
}public void updateMyUser(MyUser myUser) {
MyUser dbMyUser = getJpaTemplate().find(MyUser.class, myUser.getId());
if(myUser.getUserName() != null){
dbMyUser.setUserName(myUser.getUserName());
}
if(myUser.getAddr() != null){
dbMyUser.setAddr(myUser.getAddr());
}
getJpaTemplate().merge(dbMyUser);
}@SuppressWarnings("unchecked")
public List@SuppressWarnings("unchecked")
public List |
因?yàn)槔^承了JpaDaoSupport，索引需要獲取一個JpaTemplate來實(shí)現(xiàn)訪問數(shù)據(jù)庫，在Spring的配置文件中要注入一個org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean。
Spring的配置文件applicationContext.xml的內(nèi)容如下所示：
