巴巴運動網 16 (產品分類實體物件基本屬性的JPA對映)
阿新 • • 發佈：2019-02-02
這一節學出了好多debug,不過最後,都一一查出什麼問題來了，學會找錯誤是一門大學問啊。
實體類.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 { /** 類別 id **/ private Integer typeid; /**類別名稱 **/ private String name; /** 搜尋google 頁面存放的 內容 **/ private String note; /** 備註**/ 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);
}介面實現類
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檔案
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=1persistence.xml 檔案
<?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>
測試類：【Spring最好是要：面向介面程式設計】
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,不錯");
productService.save(type);
}
}
1，報錯：
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
是因為：
<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"/>定義了兩次，導致jdbc兩次載入。。。應刪除。
2，報錯：
如果編碼不一致，也會報錯，導致無法插入資料。
最後：測試成功。
不過，插入的資料在資料庫中竟然是 ？正在解決中。。。
