seam框架CRUD

首先，配置数据源context.xml 将这个文件放在<catalina_home>的conf目录下，我用的是tomcat6

context.xml  内容如下：

 

<Resource name="jdbc/BBS" auth="Container"  
  type="javax.sql.DataSource"  
  driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"  
  url="jdbc:sqlserver://192.168.1.1:1433;DatabaseName=infodb1"  
  username="sa" password="sa" maxActive="4" maxIdle="2"  
  maxWait="5000" /> 

 

 

在这里，我用的数据库是sql server2005 ,如果改为mysql数据库的话，需要修改driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"
换成mysql的数据库驱动。

配置seam 的components.xml，该文件放在WEB-INF目录下。

<?xml version="1.0" encoding="UTF-8"?>  
<components xmlns="http://jboss.com/products/seam/components"  
 xmlns:core="http://jboss.com/products/seam/core"  
 xmlns:persistence="http://jboss.com/products/seam/persistence"  
 xmlns:security="http://jboss.com/products/seam/security"  
 xmlns:transaction="http://jboss.com/products/seam/transaction"  
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
 xsi:schemaLocation="http://jboss.com/products/seam/core   
  http://jboss.com/products/seam/core-2.1.xsd                   http://jboss.com/products/seam/persistence   
  http://jboss.com/products/seam/persistence-2.1.xsd                   http://jboss.com/products/seam/transaction   
  http://jboss.com/products/seam/transaction-2.1.xsd                   http://jboss.com/products/seam/security   
  http://jboss.com/products/seam/security-2.1.xsd                  http://jboss.com/products/seam/components   
  http://jboss.com/products/seam/components-2.1.xsd   
  http://jboss.com/products/seam/spring   
  http://jboss.com/products/seam/spring-2.1.xsd">  
 <core:init debug="false" />  
 <core:manager concurrent-request-timeout="500"  
  conversation-id-parameter="cid" conversation-timeout="120000" />  
 <transaction:entity-transaction entity-manager="#{em}" />  
 <persistence:entity-manager-factory name="BBS" />  
 <persistence:managed-persistence-context auto-create="true"  
  entity-manager-factory="#{BBS}" name="em" />  
  
 <security:identity  
  authenticate-method="#{authenticator.authenticate}" />  
 <core:pojo-cache  
  cfg-resource-name="#{facesContext.externalContext.context.getRealPath('/WEB-INF/cache.xml')}" />  
</components>  


接着，我们写一个dao的接口

 

注意 <transaction:entity-transaction entity-manager="#{em}" />
 <persistence:entity-manager-factory name="BBS" />
 <persistence:managed-persistence-context auto-create="true"
  entity-manager-factory="#{BBS}" name="em" /> 这几句，其中 <persistence:entity-manager-factory name="BBS" /> 要跟上面的context.xml中的《Resource name="jdbc/BBS" 》一致。

 

接着，我们写一个dao的接口

 

public interface UserDAO {   
      public void saveUser(User user);   
} 

@Name(" UserDAO ")   
@AutoCreate  
  
public class UserDAOImpl implements  UserDAO {   
     @In  
     private EntityManager em;    
     public void saveUser(User user) throws PersistenceException {   
               em.persist(user);   
      }   
}  

  

 

@In
     private EntityManager em;  之际就注入进来了，不需要在写数数据库连接的东西了。

在faces层：

@In

private UserDAO userDAO;

这样就可以引入DAO进行操作了

 

 

评论

1 楼 cnlw1985 2010-03-12  

垃圾seam