hibernate annotion多对多关系示例

实体之间是多对多的关系，如图：


错误的实体代码如下

JAVA 代码:

@ManyToMany(cascade = CascadeType.PERSIST, fetch = FetchType.EAGER)
   @JoinTable(name = "product_packagetype:packageTypes:products")
   private java.util.Listimplambition.forxxx.model.PackageType> packageTypes;
   /** 
    * @generated 
    */
   @ManyToMany(cascade = CascadeType.PERSIST, fetch = FetchType.EAGER)
   @JoinTable(name = "product_productcolor:productColors:products")
   private java.util.Listimplambition.forxxx.model.ProductColor> productColors;
   /** 
    * @generated 
    */
   @ManyToMany(cascade = CascadeType.PERSIST, fetch = FetchType.EAGER)
   @JoinTable(name = "product_attach:attachs:products")
   private java.util.Listimplambition.forxxx.model.Attach> attachs;
 
 

这样的代码本身不能正常运行，报错 cannot simultaneously fetch multiple bags。
改成FetchType.LAZY后，报错 WARN [main] 2009-05-10 16:46:18,655 - SQL Error: 1064, SQLState: 42000
ERROR [main] 2009-05-10 16:46:18,655 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ':packageTypes:products packagetyp0_ left outer join PackageType packagetyp1_ on ' at line 1



最后只能修改为：
Product实体

JAVA 代码:

/** 
    * @generated 
    */
   @ManyToMany(cascade = CascadeType.PERSIST, fetch = FetchType.LAZY)
   //@JoinTable(name = "product_packagetype:packageTypes:products")
   @JoinTable(name = "product_packagetype", joinColumns = { @JoinColumn(name = "packageTypes") }, inverseJoinColumns = { @JoinColumn(name = "products") }) 
   private java.util.Listimplambition.forxxx.model.PackageType> packageTypes;
   /** 
    * @generated 
    */
   @ManyToMany(cascade = CascadeType.PERSIST, fetch = FetchType.LAZY)
   //@JoinTable(name = "product_productcolor:productColors:products")
   @JoinTable(name = "product_productcolor", joinColumns = { @JoinColumn(name = "productColors") }, inverseJoinColumns = { @JoinColumn(name = "products") })
   private java.util.Listimplambition.forxxx.model.ProductColor> productColors;
   /** 
    * @generated 
    */
   @ManyToMany(cascade = CascadeType.PERSIST, fetch = FetchType.LAZY)
   //@JoinTable(name = "product_attach:attachs:products")
   @JoinTable(name = "product_attach", joinColumns = { @JoinColumn(name = "attachs") }, inverseJoinColumns = { @JoinColumn(name = "products") })
   private java.util.Listimplambition.forxxx.model.Attach> attachs;

其他关联实体只列出一个示例，代码如下（注释掉的为studio生成的代码）

JAVA 代码:

/** 
    * @generated 
    */
   //@ManyToMany(cascade = CascadeType.PERSIST, fetch = FetchType.EAGER)
   @ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE }, fetch = FetchType.LAZY, mappedBy="attachs")
   private java.util.Listimplambition.forxxx.model.Product> products;

apusic operamasks使用了 w：foreach 迁移到tomcat的问题

aom使用了 w：foreach 迁移到tomcat的问题

如果部署到tomcat的aom应用中使用了 w：foreach，只包含
elite.jar
jsf-api.jar
operamasks-impl.jar
operamasks-options.jar
operamasks-third-party.jar
在一些特殊情况下（w：foreach 绑定的不是一个list对象）是不能运行的，需要加上jstl.jar

uidata.java 方法getDataModel会调用到jstl.jar

复制内容到剪贴板

JAVA 代码:

protected DataModel getDataModel() {
 
   // Return any previously cached DataModel instance
   if (this.model != null) {
    return (model);
   }
 
   // Synthesize a DataModel around our current value if possible
   Object current = getValue();
   if (current == null) {
    setDataModel(new ListDataModel(Collections.EMPTY_LIST));
   } else if (current instanceof DataModel) {
    setDataModel((DataModel) current);
   } else if (current instanceof List) {
    setDataModel(new ListDataModel((List) current));
   } else if (Object[].class.isAssignableFrom(current.getClass())) {
    setDataModel(new ArrayDataModel((Object[]) current));
   } else if (current instanceof ResultSet) {
    setDataModel(new ResultSetDataModel((ResultSet) current));
   } else if (current instanceof Result) {
    setDataModel(new ResultDataModel((Result) current));
   } else {
    setDataModel(new ScalarDataModel(current));
   }
   return (model);
 
  }

关于CSS Sprites

前两天看apple的网站，网站导航看起来挺酷的，查看源码发现是一个大图片，如下图
心里就想apple的网页设计师怎么这么烂，现在都是css+小图片搞掂导航的，心里一直纳闷，今天在javaeye看到CSS Sprites介绍，其中就讲到了apple，原来是使用的CSS Sprites，看来倒是自己孤陋寡闻了，呵呵！转贴这篇文章给那些和我一样孤陋寡闻的朋友们
见文章：http://www.javaeye.com/news/7261-decrypt-css-sprites-skills-tools-and-tutorials