重拾Hibernate(1)之环境配置详解编程语言

2、导入所需jar包

3、Student.java

package com.blog.ytso.com; 

import javax.persistence.Entity; 

import javax.persistence.Table; 

@Entity 

@Table(name="T_STUDENT") 

public class Student extends BizEntity{ 

 private String name; 

 private String score; 

 public String getName() { 

 return name; 

 public void setName(String name) { 

 this.name = name; 

 public String getScore() { 

 return score; 

 public void setScore(String score) { 

 this.score = score; 

Teacher.java

package com.blog.ytso.com; 

import javax.persistence.Entity; 

import javax.persistence.Table; 

@Entity 

@Table(name="T_TEACHER") 

public class Teacher extends BizEntity{ 

 private String name; 

 private String title; 

 public String getName() { 

 return name; 

 public void setName(String name) { 

 this.name = name; 

 public String getTitle() { 

 return title; 

 public void setTitle(String title) { 

 this.title = title; 

BizEntity.java

package com.blog.ytso.com; 

import javax.persistence.GeneratedValue; 

import javax.persistence.GenerationType; 

import javax.persistence.Id; 

import org.hibernate.annotations.GenericGenerator; 

public class BizEntity { 

 private String id; 

 @Id @GeneratedValue(strategy=GenerationType.AUTO,generator="bizGenerator") 

 @GenericGenerator(strategy = "uuid", name = "bizGenerator") 

 public String getId() { 

 return id; 

 public void setId(String id) { 

 this.id = id; 


 BizEntity.java是所有实体类的父类，id自动生成策略为uuid

4、hibernate.hbm.xml

 ?xml version="1.0"? 

 !DOCTYPE hibernate-mapping PUBLIC 

 "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 

 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" 

 hibernate-mapping 

 property name="dialect" org.hibernate.dialect.OracleDialect /property 

 property name="connection.url" jdbc:oracle:thin:@172.16.1.4:1521:orcl /property 

 property name="connection.username" username /property 

 property name="connection.password" 123 /property 

 property name="connection.driver_class" oracle.jdbc.driver.OracleDriver /property 

 property name="current_session_context_class" thred /property 

 property name="show_sql" true /property 

 property name="format_sql" true /property 

 property name="hbm2ddl.auto" true /property 

 /hibernate-mapping 

5、Test.java测试

package com.blog.ytso.com; 

import org.hibernate.cfg.AnnotationConfiguration; 

import org.hibernate.tool.hbm2ddl.SchemaExport; 

public class Test { 

 /** 

 * @param args 

 public static void main(String[] args) { 

 // TODO Auto-generated method stub 

 //new SchemaExport(new AnnotationConfiguration().configure()).create(true, true);

 Teacher t = new Teacher(); 

  t.setName("张三"); 

  

  Configuration cfg = new AnnotationConfiguration(); 

  SessionFactory factory =cfg.configure().buildSessionFactory(); 

  Session session = factory.openSession(); 

  session.beginTransaction(); 

  session.save(t); 

  session.getTransaction().commit(); 

}

SchemaExport自动生成数据表

 

运行程序：

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". 

SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. 

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder

此错误是缺少slf4j-nop.x.jar包  添加一个该包(slf4j-nop-1.5.8.jar)

 

Exception in thread "main" java.lang.IllegalAccessError: tried to access field org.slf4j.impl.StaticLoggerBinder.SINGLETON from class org.slf4j.LoggerFactory

 

此错误是slf4j版本错误。slf4j-api是1.5.2而slf4j-nop是1.5.8

删除slf4j-api.1.5.2添加一个1.5.8的

 

Exception in thread "main" java.lang.NoClassDefFoundError: org/hibernate/annotations/common/reflection/ReflectionManager 



此错误是少一个jar包，引入hibernate-commons-annotations.jar

 

Caused by: org.xml.sax.SAXParseException: The content of element type "property" must match "(meta*,(column|formula)*,type?)". 

 at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:236)

此错误是hibernate-cfg.xml配置文件错误(刚开始我是从文档中copy的，而那个是mapping实体类的映射文件)

 ?xml version="1.0"? 

 !DOCTYPE hibernate-configuration PUBLIC 

 "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 

 "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" 

 hibernate-configuration 

 session-factory 

 property name="dialect" org.hibernate.dialect.OracleDialect /property 

 property name="connection.url" jdbc:oracle:thin:@172.16.1.4:1521:orcl /property 

 property name="connection.username" username /property 

 property name="connection.password" 123 /property 

 property name="connection.driver_class" oracle.jdbc.driver.OracleDriver /property 

 property name="current_session_context_class" thred /property 

 property name="show_sql" true /property 

 property name="format_sql" true /property 

 property name="hbm2ddl.auto" true /property 

 /session-factory 

 /hibernate-configuration 

  

Exception in thread "main" org.hibernate.HibernateException: JDBC Driver class not found: oracle.jdbc.driver.OracleDriver

没有引入oracle驱动

 

Exception in thread "main" org.hibernate.MappingException: Unknown entity: com.blog.ytso.com.Teacher

没有在hibernate.cfg.xml中加入映射

 mapping / 

 mapping / 

 然后运行：

Exception in thread "main" org.hibernate.AnnotationException: No identifier specified for entity: com.blog.ytso.com.Teacher

[email protected]  用在实体的继承过程中的父类上。

 

如果直接再次运行的话 会报错 表或视图不存在

而应用SchemaExport先生成表  

hibernate生成的表语句为：

 drop table T_STUDENT cascade constraints 

 drop table T_TEACHER cascade constraints 

 create table T_STUDENT ( 

 id varchar2(255) not null, 

 name varchar2(255), 

 score varchar2(255), 

 primary key (id) 

 create table T_TEACHER ( 

 id varchar2(255) not null, 

 name varchar2(255), 

 title varchar2(255), 

 primary key (id) 

 )

 此时再插入一条teacher数据：

Hibernate: 

 insert 

 into 

 T_TEACHER 

 (name, title, id) 

 values 

 (?, ?, ?)

最终所需jar包



结束

  

 
原创文章，作者：Maggie-Hunter，如若转载，请注明出处：https://blog.ytso.com/14394.html
 

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