Java开发网 - 使用jbossIDE调试自定义主键类ProductPK的ProductBean

Java开发网

您没有登录

» Java开发网 » Java EE 综合讨论区 » EJB 3.0

打印话题 寄给朋友 订阅主题

作者

使用jbossIDE调试自定义主键类ProductPK的ProductBean

twinlj77

发贴: 4
积分: 0

于 2006-03-30 09:55

昨天一直在调试productBean.以前也作过的,是使用使用持久化域中的productID字符串域作为主键使用,
Ed Roman 的精通EJB (第三版)中虽然提供了ProductPK 类,但在productBean 和部署描述符 ejb-jar.xml中
却使用的是productID做主建,
前几天也看过不少文章介绍做productBean但是都没有用到ProductPK 类

实体bean可以自定义主键类,这次就用自定义(Ed Roman's)的ProductPK主键类调试ProductBean
ProductPK.java
package examples.cmp;

import java.io.Serializable;

public class ProductPK implements Serializable {
/*
* Note that the primary key fields must be a
* subset of the the container-managed Bean fields.
* The fields we are marking as container-managed in
* our Bean are productID, name, desc, and basePrice.
* Therefore our PK fields need to be from that set.
*/
public String productID;

public ProductPK(String productID) {
this.productID = productID;
}

public ProductPK() {
}

public String toString() {
return productID.toString();
}

public int hashCode()
{
return productID.hashCode();
}

public boolean equals(Object prod)
{
return ((ProductPK)prod).productID.equals(productID);
}
}

下面给出ProductBean的代码:
呵呵 ,因为是在JBossIDE下调试, 添加了xdoclet标记!
其他product接口,product home 接口和部署描述符自动生成;

package examples.cmp;

import java.rmi.RemoteException;

import javax.ejb.EJBException;
import javax.ejb.EntityBean;
import javax.ejb.EntityContext;
import javax.ejb.RemoveException;

/**
* @ejb.bean name="Product"
* display-name="Name for Product"
* description="Description for Product"
* jndi-name="ejb/Product"
* type="CMP"
* cmp-version="2.x"
* view-type="remote"
*
*
*@ejb.finder signature="java.util.Collection findAllProducts()"
* query="SELECT DISTINCT OBJECT Camera

FROM products p WHERE p.productID IS NOT NULL"
*
*@ejb.finder signature="java.util.Collection findByName(java.lang.String name)"
* query="SELECT DISTINCT OBJECT Camera

FROM products p WHERE p.name = ?1"
*
*@ejb.finder signature="java.util.Collection findByDescription(java.lang.String description)"
* query="SELECT DISTINCT OBJECT Camera

FROM products p WHERE p.description = ?1"
*
*@ejb.finder signature="java.util.Collection findByBasePrice(double basePrice)"
* query="SELECT DISTINCT OBJECT Camera

FROM products p WHERE p.basePrice =?1"
*
*/
public abstract class ProductBean implements EntityBean {
  protected EntityContext ctx;
  public ProductBean() {
    super();
    // TODO Auto-generated constructor stub
  }

  public void ejbActivate() throws EJBException, RemoteException {
    System.out.println("ejbActivate() called");
  }

  public void ejbLoad() throws EJBException, RemoteException {
    // TODO Auto-generated method stub
    System.out.println("ejbLoad() called");
  }

  public void ejbPassivate() throws EJBException, RemoteException {
    // TODO Auto-generated method stub
    System.out.println("ejbPassivate() called");
  }

  public void ejbRemove()
    throws RemoveException,
    EJBException,
    RemoteException {
    // TODO Auto-generated method stub
    System.out.println("ejbRemove() called");
  }

  public void ejbStore() throws EJBException, RemoteException {
    // TODO Auto-generated method stub
    System.out.println("ejbStore() called");
  }

  public void setEntityContext(EntityContext ctx)
    throws EJBException,
    RemoteException {
    // TODO Auto-generated method stub
    System.out.println("setEntityContext called called");
    this.ctx = ctx;
  }

  public void unsetEntityContext() throws EJBException, RemoteException {
    // TODO Auto-generated method stub
    System.out.println("unsetEntityContext called called");
    this.ctx = null;
  }

  /**
   * Getter for CMP Field name
   *
   *
   * @ejb.persistent-field
   * @ejb.interface-method view-type="remote"
   */
  public abstract String getName();

  /**
   * Setter for CMP Field name
   *
   * @ejb.interface-method view-type="remote"
   */
  public abstract void setName(String value);

  /**
   * Getter for CMP Field description
   *
   *
   * @ejb.persistent-field
   * @ejb.interface-method view-type="remote"
   */
  public abstract String getDescription();

  /**
   * Setter for CMP Field description
   *
   * @ejb.interface-method view-type="remote"
   */
  public abstract void setDescription(String value);

  /**
   * Getter for CMP Field basePrice
   *
   *
   * @ejb.persistent-field
   * @ejb.interface-method view-type="remote"
   */
  public abstract double getBasePrice();

  /**
   * Setter for CMP Field basePrice
   *
   * @ejb.interface-method view-type="remote"
   */
  public abstract void setBasePrice(double basePrice);

  /**
   * Create method
   * @ejb.create-method view-type = "remote"
   */
  public ProductPK ejbCreate(
    String productID,
    String name,
    String description,
    double basePrice) throws javax.ejb.CreateException {
    System.out.println("ejbCreate() called");

    setName(name);
    setDescription(description);
    setBasePrice(basePrice);
    setProductID(productID);
    return new ProductPK(productID);
  }
  /**
   * Post Create method
   */
  public void ejbPostCreate(
    String productID,
    String name,
    String description,
    double basePrice) throws javax.ejb.CreateException {
    // TODO Auto-generated method stub
  }

  /**
   * Getter for CMP Field productID
   *
   *
   * @ejb.persistent-field
   * @ejb.interface-method view-type="remote"
   */
  public abstract String getProductID();

  /**
   * Setter for CMP Field productID
   *
   * @ejb.interface-method view-type="remote"
   */
  public abstract void setProductID(String value);

}

执行 Xdoclet Configuration 后
生成的ProductHome中
public examples.interfaces.Product findByPrimaryKey(examples.interfaces.ProductPK pk)
throws javax.ejb.FinderException,java.rmi.RemoteException;
提示有错误: 将examples.interfaces.ProductPK 改为 examples.cmp.ProductPK 即可
自动生成的ejb-jar.xml 如下
<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">

<ejb-jar >

<description><![CDATA[No Description.]]></description>
<display-name>Generated by XDoclet</display-name>

<enterprise-beans>





<entity >
<description><![CDATA[Description for Product]]></description>
<display-name>Name for Product</display-name>

<ejb-name>Product</ejb-name>

<home>examples.interfaces.ProductHome</home>
<remote>examples.interfaces.Product</remote>

<ejb-class>examples.cmp.ProductBean</ejb-class>
<persistence-type>Container</persistence-type>
<prim-key-class>examples.interfaces.ProductPK</prim-key-class>
<reentrant>False</reentrant>
<cmp-version>2.x</cmp-version>
<abstract-schema-name>Product</abstract-schema-name>
<cmp-field >
<description><![CDATA[Getter for CMP Field name]]></description>
<field-name>name</field-name>
</cmp-field>
<cmp-field >
<description><![CDATA[Getter for CMP Field description]]></description>
<field-name>description</field-name>
</cmp-field>
<cmp-field >
<description><![CDATA[Getter for CMP Field basePrice]]></description>
<field-name>basePrice</field-name>
</cmp-field>
<cmp-field >
<description><![CDATA[Getter for CMP Field productID]]></description>
<field-name>productID</field-name>
</cmp-field>

<query>
<query-method>
<method-name>findAllProducts</method-name>
<method-params>
</method-params>
</query-method>
<ejb-ql><![CDATA[SELECT DISTINCT OBJECT Camera

FROM products p WHERE p.productID IS NOT NULL]]></ejb-ql>
</query>
<query>
<query-method>
<method-name>findByName</method-name>
<method-params>
<method-param>java.lang.String</method-param>
</method-params>
</query-method>
<ejb-ql><![CDATA[SELECT DISTINCT OBJECT Camera

FROM products p WHERE p.name = ?1]]></ejb-ql>
</query>
<query>
<query-method>
<method-name>findByDescription</method-name>
<method-params>
<method-param>java.lang.String</method-param>
</method-params>
</query-method>
<ejb-ql><![CDATA[SELECT DISTINCT OBJECT Camera

FROM products p WHERE p.description = ?1]]></ejb-ql>
</query>
<query>
<query-method>
<method-name>findByBasePrice</method-name>
<method-params>
<method-param>double</method-param>
</method-params>
</query-method>
<ejb-ql><![CDATA[SELECT DISTINCT OBJECT Camera

FROM products p WHERE p.basePrice =?1]]></ejb-ql>
</query>


</entity>






</enterprise-beans>






<assembly-descriptor >















</assembly-descriptor>

</ejb-jar>
jboss.xml 和jbosscmp-jdbc.xml 在此略去

注意 ,在此应略作修改.此时prim-key-class为:
<prim-key-class>examples.interfaces.ProductPK</prim-key-class>
将它改为:<prim-key-class>examples.cmp.ProductPK</prim-key-class>

还有将<abstract-schema-name>Product</abstract-schema-name> 改为
<abstract-schema-name>products</abstract-schema-name>
因为在abstract-schema-name应全是大写或小写字母
products 与我们在xdoclet标记
query="SELECT DISTINCT OBJECT Camera

FROM products p WHERE p.productID IS NOT NULL"
中的表相对应

打包相关文件,并部署.

client测试程序如下:
package examples.cmp;

import java.util.Iterator;
import java.util.Properties;

import javax.naming.Context;
import javax.naming.InitialContext;

import examples.interfaces.Product;
import examples.interfaces.ProductHome;

public class ProductClient {

   public static void main(String[] args) throws Exception {

   ProductHome home = null;
   Context ctx=null;
   try {
   /*
   * Get a reference to the Product Home Object - the
   * factory for Product EJB Objects
   */

       try{
         Properties p = new Properties();
        p.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
        p.put(Context.URL_PKG_PREFIXES, "jboss.naming:org.jnp.interfaces");
        p.put(Context.PROVIDER_URL, "localhost:1099");

       ctx = new InitialContext Camera

;
       }catch(Exception e){
       System.out.println("Cannot get initial context: " + e.getMessage());
       System.exit(1);
       }

       home = (ProductHome) javax.rmi.PortableRemoteObject.narrow(ctx.lookup("ejb/Product"), ProductHome.class);

   /*
   * Use the factory to create the Product EJB Object
   */
   home.create("123-456-7890", "P5-350", "350 Mhz Pentium", 200);
   home.create("123-456-7891", "P5-400", "400 Mhz Pentium", 300);
   home.create("123-456-7892", "P5-450", "450 Mhz Pentium", 400);
   home.create("123-456-7893", "SD-64", "64 MB SDRAM", 50);
   home.create("123-456-7894", "SD-128", "128 MB SDRAM", 100);
   home.create("123-456-7895", "SD-256", "256 MB SDRAM", 200);

   /*
   * Find a Product, and print out it's description
   */
   Iterator i = home.findByName("SD-64").iterator();
   System.out.println("The following product descriptions match the product name SD-64:");
   while (i.hasNext()) {
   Product prod = (Product) javax.rmi.PortableRemoteObject.narrow(i.next(), Product.class);
   System.out.println(prod.getDescription());
   }

   /*
   * Find all products that cost $200
   */
   System.out.println("Calling finder to find all products that cost $200");
   i = home.findByBasePrice(200).iterator();

   while (i.hasNext()) {
   Product prod = (Product) javax.rmi.PortableRemoteObject.narrow(i.next(), Product.class);
   System.out.println(prod.getDescription());
   }
   }
   catch (Exception e) {
   e.printStackTrace();
   }
   finally {
   if (home != null) {
   System.out.println("Destroying products..");

   /*
   * Find all the products
   */
   Iterator i = home.findAllProducts().iterator();
   while (i.hasNext()) {
   try {
   Product prod = (Product) javax.rmi.PortableRemoteObject.narrow(i.next(), Product.class);
   if (prod.getProductID().startsWith("123")) {
   prod.remove();
   }
   }
   catch (Exception e) {
   e.printStackTrace();
   }
   }
   }
   }
   }
}

运行成功;~!
进入http://localhost:8080/jmx-console
点击jboss项下的
database=localDB,service=Hypersonic
involke void startDatabaseManager()方法
会出现一个小的数据库管理系统 Hypersonic
可以看到有个表product已经生成!

有一个的疑问!!!!?
我们是让容器自动生成表的,但是我们定义的表是products
但是容器却自动生成了product,而且程序运行通过了!!!

我想<abstract-schema-name>products</abstract-schema-name> 和
query="SELECT DISTINCT OBJECT Camera

FROM products p WHERE p.productID IS NOT NULL" 中的表名必须一致!
但都只是表product的一个别名容器默认的为entitybean自动生成的表为product与ejb-name相同!
<Jboss Adiminstration and Development> <Jboss管理开发核心技术中>有关于如何设置实体映射的实例
可以将实体bean映射为数据库中自定义的表名!

已读帖子

新的帖子

被删除的帖子