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spring整合JPA總結(jié)

2012.07.11

1、定義實(shí)體類

import java.io.Serializable;
import java.util.Date;
import java.util.List;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.OneToMany;

@Entity // 表明該類 (RtoUser ) 為一個(gè)實(shí)體類，如果寫成@Entity（RtoUserTable）它對(duì)應(yīng)數(shù)據(jù)庫中的表表名是RtoUserTable；

//寫成@Entity則默認(rèn)對(duì)應(yīng)表RtoUser，和類名稱相同
public class RtoUser implements Serializable{

/**
*
*/
private static final long serialVersionUID = 1L;

@Id //指定userName為主鍵
private String userName;
private String password;

@Column(length = 30)
public String getUserName() {
return userName;
}

public void setUserName(String userName) {
this.userName = userName;
}

@Column(length = 30)
public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

}
2.定義Dao接口

import java.util.List;

/**

* 該接口定義操作數(shù)據(jù)庫的抽象方法，方法體由具體類去實(shí)現(xiàn)

*/

public interface BaseDao {
    public abstract void save (Object object);
    public abstract void update (Object object);
    public abstract Object find(Object object);
    public abstract List findByCondition(String conditions);
    public abstract void deleteByCondition(String conditions);
    public abstract void delete(Object object);
}

3.定義具體類

import java.util.List;

import org.springframework.orm.jpa.support.JpaDaoSupport;
import org.springframework.transaction.annotation.Transactional;

import com.huahuan.devicemanager.common.entity.RtoUser;
import com.huahuan.devicemanager.server.dao.BaseDao;

@Transactional
@SuppressWarnings("deprecation")
public class RtoUserDaoImpl extends JpaDaoSupport implements BaseDao { //實(shí)體的具體Dao類必須繼承JpaDaoSupport類

@Override
public void save(Object object) {
object = (RtoUser) object;

this.getJpaTemplate().persist(object);

}

@Override
public void update(Object object) {
RtoUser rtoUser = (RtoUser) object;
this.getJpaTemplate().merge(rtoUser);
}

@Override
public Object find(Object object) {
   RtoUser rtoUser = (RtoUser) object;
rtoUser = this.getJpaTemplate().find(rtoUser.getClass(),
    rtoUser.getUserName());
  return rtoUser;
}

@Override
@SuppressWarnings("unchecked")
public List<RtoUser> findByCondition(String conditions) {
return null;
}

@Override
public void deleteByCondition(String conditions) {

}

@Override
public void delete(Object object) {
object = (RtoUser) object;
this.getJpaTemplate().remove(this.getJpaTemplate().merge(object));
}

}
4.persistence.xml配置文件

注：在java應(yīng)用中，該文件一定要方法哦src/META-INF/下

<?xml version="1.0" encoding="UTF-8"?>

<persistence xmlns="http://java.sun.com/xml/ns/persistence

<persistence-unit name="jpa" transaction-type="RESOURCE_LOCAL">

<provider>org.hibernate.ejb.HibernatePersistence</provider>

<class>com.huahuan.devicemanager.common.entity.RtoUser</class>