第一個設計模式非常簡單。一個公司和雇員的Entity Bean和下面給出的Entity Bean的代碼片斷是類似的。它們是由jbuilder4的EntityBean模版生成的。所有的字段都聲明為public的cmp字段。
Code snippet for Company Entity Bean
public class CompanyBean implements EntityBean {
EntityContext entityContext;
public Integer comId; //the primary key
public String comName; //the company name
public String comDescription //basic description
public Timestamp mutationDate //explained later
public Integer ejbCreate(
) throws
CreateException {
return null;
}
//various get() and set() for every column/field
// which are exposed in the Remote Interface as well
Code snippet for Employee Entity Bean
public class EmployeeBean implements EntityBean {
EntityContext entityContext;
public Integer empId; //the primary key
public Integer comId; //the company foreign key
public String empFirstName; //the employee firstname
public String empLastName // the employee lastname
public Timestamp mutationDate //explained later
public Integer ejbCreate(
) throws
CreateException {
return null;
}
//various get() and set() for every column/field
// which are exposed in the Remote Interface as well
這個設計模式雖然很簡單,但是卻有很多缺點,比如,對每一個字段的訪問都會導致對get()和set()方法的一次遠程調用。而遠程過程調用(RPCs)是非常耗費資源的,並且,對於在實際中通常要求的組合的訪問會導致一系列的遠程調用。可以說,這個模式在實際中可用性很差。上面展示的設計模式可以作為其他設計模式的基礎,比如RAD,原型設計,測試等。這時,那個代表雇員的Employee Entity Bean並沒有展示出在雇員和公司之間有何關系。