Hiberante+Mysql+Maven2 XML配置原型

程序员文章站 2022-03-29 22:58:21

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使用Maven3+Hibernate 3.1+Mysql实现一个简单的模型

使用到的工具:
   Eclipse 4.3
   Maven 3.1
   Hibernate 3.1rc2
   MySQL 5.0

具体搭建实现步骤：
1.创建一个数据库为David。
2.在David数据库中创建一个表

DROP TABLE IF EXISTS `stock`;
CREATE TABLE `stock` (
  `STOCK_ID` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  `STOCK_CODE` VARCHAR(10) NOT NULL,
  `STOCK_NAME` VARCHAR(20) NOT NULL,
  PRIMARY KEY (`STOCK_ID`) USING BTREE,
  UNIQUE KEY `UNI_STOCK_NAME` (`STOCK_NAME`),
  UNIQUE KEY `UNI_STOCK_ID` (`STOCK_CODE`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

3.在Eclipse中创建一个Maven Project
4.编写POM.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.david.common</groupId>
  <artifactId>SpringExample</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>SpringExample</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
<dependency>
    <groupId>hibernate</groupId>
    <artifactId>hibernate</artifactId>
    <version>3.1rc2</version>
</dependency>
	<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
		<version>5.1.9</version>
	</dependency>
	
	<!-- Hibernate library dependecy start -->
	<dependency>
		<groupId>dom4j</groupId>
		<artifactId>dom4j</artifactId>
		<version>1.6.1</version>
	</dependency>
 
	<dependency>
		<groupId>commons-logging</groupId>
		<artifactId>commons-logging</artifactId>
		<version>1.1.1</version>
	</dependency>
 
	<dependency>
		<groupId>commons-collections</groupId>
		<artifactId>commons-collections</artifactId>
		<version>3.2.1</version>
	</dependency>
 
	<dependency>
		<groupId>cglib</groupId>
		<artifactId>cglib</artifactId>
		<version>2.2</version>
	</dependency>
	<!-- Hibernate library dependecy end -->
 
	<dependency>
		<groupId>javax.transaction</groupId>
		<artifactId>jta</artifactId>
		<version>1.1</version>
	</dependency>
	<dependency>
    <groupId>com.jolira</groupId>
    <artifactId>asm</artifactId>
    <version>3.3.0</version>
</dependency>
  </dependencies>
</project>

5.配置Stock.hbm.xml 这个文件要放在src/main/resources/com/david/common/Stock.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>
    <class name="com.david.common.Stock" table="stock" catalog="david">
        <id name="stockId" type="java.lang.Integer">
            <column name="STOCK_ID" />
            <generator class="identity" />
        </id>
        <property name="stockCode" type="string">
            <column name="STOCK_CODE" length="10" not-null="true" unique="true" />
        </property>
        <property name="stockName" type="string">
            <column name="STOCK_NAME" length="20" not-null="true" unique="true" />
        </property>
    </class>
</hibernate-mapping>

6.编写Stock实体类

public class Stock implements Serializable {
	
	private static final long serialVersionUID = 1L;
	
	private Integer stockId;
	private String stockCode;
	private String stockName;
	
	public Stock () {
		
	}
	
	public Stock(String stockCode, String  stockName){
		this.stockCode = stockCode;
		this.stockName = stockName;
	}

	public Integer getStockId() {
		return stockId;
	}

	public void setStockId(Integer stockId) {
		this.stockId = stockId;
	}

	public String getStockCode() {
		return stockCode;
	}

	public void setStockCode(String stockCode) {
		this.stockCode = stockCode;
	}

	public String getStockName() {
		return stockName;
	}

	public void setStockName(String stockName) {
		this.stockName = stockName;
	}

	public String toString(){
		return "[ stockId:"+stockId
				+" stockName:"+stockName+" stockCode:"+stockCode+"]";
	}
}

7.编写一个简单的Hibernate工具类。用来获取Session等操作

public class HibernateUtil {
	
	private static final SessionFactory sessionFactory = buildSessionFactory();
	
    public static SessionFactory buildSessionFactory(){
    	try {
			 return new Configuration().configure().buildSessionFactory();
		} catch (Exception ex) {
			
			System.err.println("Initial SessionFactory creation fails"+ex);
			throw new ExceptionInInitializerError(ex);
	   }
    }
    
    public static SessionFactory getSessionFactory(){
    	return sessionFactory;
    }
    
    public static void shutdown(){
    	getSessionFactory().close();
    }
}

8.最后编写Hibernate.cfg.xml放在/src/main/resources/hibernate.cfg.xml

<?xml version="1.0" encoding="utf-8"?>
<!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="hibernate.bytecode.use_reflection_optimizer">false</property>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/david</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">123456</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="show_sql">true</property>
        
        <mapping resource="com/david/common/Stock.hbm.xml"></mapping>
        
    </session-factory>
</hibernate-configuration>

9.写个测试类来验证下配置是否有问题

public class App 
{
    public static void main( String[] args )
    {
       System.out.println("Maven +hibernate + Mysql");
       
        Session session = HibernateUtil.getSessionFactory().openSession();
        session.beginTransaction();
        Stock stock = new Stock();
        
        stock.setStockCode("47135");
        stock.setStockName("GENM");
        session.save(stock);
        session.getTransaction().commit();
        
    }
}

10.运行发现报错了。报错信息如下：

Exception in thread "main" java.lang.NoSuchMethodError: org.objectweb.asm.ClassWriter.<init>(I)V
	at net.sf.cglib.core.DebuggingClassWriter.<init>(DebuggingClassWriter.java:47)
	at net.sf.cglib.core.DefaultGeneratorStrategy.getClassWriter(DefaultGeneratorStrategy.java:30)
	at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:24)
	at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
	at net.sf.cglib.core.KeyFactory$Generator.create(KeyFactory.java:144)
	at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:116)
	at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:108)
	at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:104)
	at org.hibernate.impl.SessionFactoryImpl.<clinit>(SessionFactoryImpl.java:362)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1145)
	at com.david.utils.HibernateUtil.buildSessionFactory(HibernateUtil.java:16)
	at com.david.utils.HibernateUtil.<clinit>(HibernateUtil.java:12)
	at com.david.common.App.main(App.java:17)

11.解决这个问题：原来是包的冲突(asm没有引入3.3版本的话，由于maven的依赖传递会自动引入一个1.5.3版本的asmjar包，这个包会跟cglib 2.2版本的包发生冲突。因此要显示的引入一个高版本的asm包)
在pom.xml中显示加入

	<dependency>
    <groupId>com.jolira</groupId>
    <artifactId>asm</artifactId>
    <version>3.3.0</version>
</dependency>

12.再次运行就没问题了。

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