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。