重拾Hibernate(1)之环境配置详解编程语言

1、新建Web Project工程

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 class="com.blog.ytso.com.Teacher"/> 
	<mapping class="com.blog.ytso.com.Student"/>

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