spring+jpa整合时创建实体报错

Question

springjpamysqlbeanhibernate

Answer 1

下面是基本的几个项目文件：<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"   
       xmlns:aop="http://www.springframework.org/schema/aop" 
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://www.springframework.org/schema/context    
       http://www.springframework.org/schema/context/spring-context-2.5.xsd
       http://www.springframework.org/schema/tx 
       http://www.springframework.org/schema/tx/spring-tx-2.5.xsd 
       http://www.springframework.org/schema/aop  
       http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
     <context:annotation-config/>
     <context:component-scan base-package="muyu"/>
     <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="false">
     <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
     <property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8"/>
     <property name="username" value="root"/>
     <property name="password" value="123"/>
     <property name="initialSize" value="1"/>
     <property name="maxIdle" value="2"/>
     <property name="minIdle" value="1"/>
     </bean>
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"/>
 <property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml"/>
<property name="loadTimeWeaver">  
             <bean class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver"/>  
         </property>
</bean> 
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
   <property name="entityManagerFactory" ref="entityManagerFactory"/>
  </bean>
 
     <tx:annotation-driven transaction-manager="transactionManager"/>
</beans><?xml version="1.0" encoding="UTF-8"?>  
<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">  <persistence-unit name="muyu" transaction-type="RESOURCE_LOCAL">  
   <provider>org.hibernate.ejb.HibernatePersistence</provider>
   <properties>  
    <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />  
    <property name="hibernate.max_fetch_depth" value="3" />  
    <property name="hibernate.show_sql" value="false" />  
    <property name="hibernate.format_sql" value="false" />  
    <property name="hibernate.hbm2ddl.auto" value="update"/>  
   </properties>  
</persistence-unit>
</persistence>package muyu.service.product.impl;import java.util.UUID;import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;import muyu.bean.product.Brand;
import muyu.dao.Daosuppot;
import muyu.service.product.BrandService;@Service
@Transactional
public class BrandServiceBean extends Daosuppot implements BrandService { @Override
public void sava(Object entity) {
((Brand)entity).setCode(UUID.randomUUID().toString());
super.sava(entity);
}
}
package muyu.service.product;import muyu.dao.DAO;public interface BrandService extends DAO{}
package muyu.bean.product;import java.io.Serializable;import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;@Entity
public class Brand implements Serializable{
/**
 * 
 */
private static final long serialVersionUID = 1L;
public Brand(String name, String logopath) {
this.name = name;
this.logopath = logopath;
}
public Brand() {
}
@Id @Column(length=36)
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
@Column(nullable=false,length=40)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Column(nullable=false)
public Boolean getVisible() {
return visible;
}
public void setVisible(Boolean visible) {
this.visible = visible;
}
@Column(length=3000)
public String getLogopath() {
return logopath;
}
public void setLogopath(String logopath) {
this.logopath = logopath;
}
private String code;
private String name;
private Boolean visible=true;
private String logopath;
}

Answer 2

interface BrandService extends DAO ?? 你这service继承 dao??  应该是在你的 service　实现类　
注入需要　使用的dao把
 
@Service
@Transactional
public class BrandServiceBean extends Daosuppot implements BrandService {
    @Autowired
    Dao dao;
 
    @Override
    public void sava(Object entity) {
        ((Brand)entity).setCode(UUID.randomUUID().toString());
        dao.sava(entity);
    }
}