巴巴运动网 16 (产品归类实体对象基本属性的JPA映射)

巴巴运动网 16 (产品分类实体对象基本属性的JPA映射)

这一节学出了好多debug,不过最后,都一一查出什么问题来了，学会找错误是一门大学问啊。

实体类.java

package com.itcast.bean; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; @Entity public class ProductType { /** 类别 id **/ private Integer typeid; /**类别名称 **/ private String name; /** 搜索google 页面存放的 内容 **/ private String note; /** 备注**/ private boolean visible = true; @Id @GeneratedValue(strategy = GenerationType.AUTO) public Integer getTypeid() { return typeid; } public void setTypeid(Integer typeid) { this.typeid = typeid; } @Column(length=36,nullable=false) public String getName() { return name; } public void setName(String name) { this.name = name; } @Column(length=200) public String getNote() { return note; } public void setNote(String note) { this.note = note; } @Column(nullable=false) public boolean getVisible() { return visible; } public void setVisible(boolean visible) { this.visible = visible; } }

package com.itcast.service.product; import com.itcast.bean.ProductType; public interface ProductService { public void save(ProductType type); }

接口实现类

package com.itcast.service.product.impl; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import com.itcast.bean.ProductType; import com.itcast.service.product.ProductService; @Service @Transactional public class ProductServiceBean implements ProductService { @PersistenceContext EntityManager em; @Override public void save(ProductType type) { em.persist(type); } }

beans.xml  【Spring容器】

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 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/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"> <context:component-scan base-package="com.itcast"/> <context:property-placeholder location="classpath:jdbc.properties"/> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="${driverClassName}"/> <property name="url" value="${url}"/> <property name="username" value="${username}"/> <property name="password" value="${password}"/> <property name="initialSize" value="${initialSize}"/> <property name="maxActive" value="${maxActive}"/> <property name="maxIdle" value="${maxIdle}"/> <property name="minIdle" value="${minIdle}"/> </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> <!-- Activates @Transactional for DefaultImageDatabase --> <tx:annotation-driven transaction-manager="transactionManager"/> </beans>

jdbc.properties文件

driverClassName=org.gjt.mm.mysql.Driver url=jdbc:mysql://localhost:3306/itcast?useUnicode=true&characterEncoding=UTF-8 username=root password=root initialSize=1 maxActive=100 maxIdle=8 minIdle=1

persistence.xml 文件

<?xml version="1.0"?> <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 http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"> <!-- file:///D:\hibernate\hibernate-entitymanager-3.3.2.CR1\resources\org\hibernate\ejb\persistence_1_0.xsd --> <persistence-unit name="itcast" transaction-type="RESOURCE_LOCAL"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/> <property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver"/> <property name="hibernate.connection.username" value="root"/> <property name="hibernate.connection.password" value="123456"/> <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/itcast?useUnicode=true&characterEncoding=UTF-8"/> <property name="hibernate.max_fetch_depth" value="3"/> <property name="hibernate.hbm2ddl.auto" value="update"/> <property name="hibernate.jdbc.fetch_size" value="18"/> <property name="hibernate.jdbc.batch_size" value="10"/> <property name="hibernate.show_sql" value="false"/> <property name="hibernate.format_sql" value="false"/> </properties> </persistence-unit> </persistence>

测试类：【Spring最好是要：面向接口编程】

package junit.test; import org.junit.BeforeClass; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.itcast.bean.ProductType; import com.itcast.service.product.ProductService; public class ProductTest { @BeforeClass public static void setUpBeforeClass() throws Exception { } @Test public void runtest() { ApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml"); ProductService productService = (ProductService) cxt.getBean("productServiceBean"); ProductType type = new ProductType(); type.setName("瑜伽用品"); type.setNote("很好,不错"); productService.save(type); } }

1，报错：

Caused by: java.lang.UnsupportedOperationException: Not supported by BasicDataSource
    at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:899)
    at org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider.getConnection(InjectedDataSourceConnectionProvider.java:43)
    at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
    at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
    at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:142)
    at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:85)
    at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1353)
    at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:38)
    at org.springframework.orm.jpa.DefaultJpaDialect.beginTransaction(DefaultJpaDialect.java:70)
    at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:330)
    ... 31 more

分析：

Not supported by BasicDataSource
    at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:899)
    at 

是因为：

<property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver"/> <property name="hibernate.connection.username" value="root"/> <property name="hibernate.connection.password" value="123456"/> <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/itcast?useUnicode=true&characterEncoding=UTF-8"/>

定义了两次，导致jdbc两次加载。。。应删除。

2，报错：

如果编码不一致，也会报错，导致无法插入数据。

最后：测试成功。

不过，插入的数据在数据库中竟然是 ？正在解决中。。。