我看 jLynx

崔振 — Thu, 30 Aug 2007 18:09:00 GMT

jLynx是一个简单、轻量级、高性能的持久层框架。它非常适合于中小应用程序开发，其jar文件大小只有32K并且不依赖任何第三方组件。jLynx的API远比Hibernate、EJB 或JPA来得简单。POJO与java.util.Map持久化都是使用现有JDBC标准。经测试支持的数据库包括：Microsoft SQL Server 2000+、Oracle 9i、10g、IBM DB2/UDB、MySQL和HSQL。支持通过XML定义SQL查询。提供完整的示例包括POJO与JSP代码生成。

于是我google了一下，没有源代码，有点可惜。只有一个zip包。里面有个war包。
唉……既然是开源，为啥没有源代码呢？有点耿耿于怀。
还是来一个QS吧
1.web.xml

1 <servlet>
2   <servlet-name>jLynxFormHandlerservlet-name>
3     <servlet-class>example.FormHandlerServletservlet-class>
4     <load-on-startup>1load-on-startup>
5 servlet>
6 <servlet-mapping>
7   <servlet-name>jLynxFormHandlerservlet-name>
8   <url-pattern>/jLynxServlet/*url-pattern>
9 servlet-mapping>

2.实现getDatabaseConnection()方法

1 public class FormHandlerServlet extends net.sf.jlynx.web.FormHandlerServlet {
2
3     public Connection getDatabaseConnection() throws SQLException {
4
5                 Context c;
6                 try {
7                         c = new InitialContext();
8                         DataSource ds = (DataSource) c.lookup("java:jdbc/MyDatabase");
9                         return ds.getConnection();
10                 } catch (NamingException e) {
11                         e.printStackTrace();
12                         throw new SQLException(e.getMessage());
13                 }
14     }
15 }
16

官方提供了一个完整的servlet的例子

1 import java.sql.Connection;
2 import java.sql.DriverManager;
3 import java.sql.SQLException;
4
5 import net.sf.jlynx.RelationalFactory;
6
7 @SuppressWarnings("unchecked")
8 public class FormHandlerServlet extends net.sf.jlynx.web.FormHandlerServlet {
9
10     private static final long serialVersionUID = 7379859928139821607L;
11
12     private static boolean tableCreated = false;
13
14     public Connection getDatabaseConnection() throws SQLException {
15
16         try {
17             Class.forName(params.get("driver"));
18         } catch (Exception e) {
19         }
20         Connection c = DriverManager.getConnection(params.get("url"), params
21                 .get("user"), params.get("password"));
22
23         if (!tableCreated) {
24             try {
25                 RelationalFactory.getInstance().setConnection(c).exec(
26                         "PersonDDL", null);
27                 tableCreated = true;
28             } catch (Exception e) {
29                 // TODO Auto-generated catch block
30                 e.printStackTrace();
31             } finally {
32                 c = DriverManager.getConnection(params.get("url"), params
33                         .get("user"), params.get("password"));
34             }
35
36         }
37
38         return c;
39     }
40
41     @SuppressWarnings("unused")
42     public String list() throws SQLException {
43
44         String result = RelationalFactory.getInstance().setConnection(conn)
45                 .select("SelectAllPersons", null, "PERSON");
46
47         result = "\n\n" + result
48                 + "";
49
50         logger.debug("\n\nXML..\n\n" + result + "\n\n");
51         return result;
52     }
53
54     @Override
55     public String save() throws SQLException {
56         return "No. of objects saved: " + super.save();
57     }
58
59 }
60
61

3.页面的实现

1 <form action="#" id="person">
2     <input name="person.id" type="hidden">
3        Name: <input name="person.name" type="text"> <br>
4        City: <input name="person.city" type="text"> <br>
5        Country: <input name="person.country" type="text"> <br>
6        <a href="javascript:savePerson()">Savea>
7        <a href="javascript:deletePerson()">Deletea>
8    form><script type="text/javascript">
9    function savePerson() {
10     $("person").action = "jLynxServlet/action/save"
11     $("person").request()
12    }
13    function deletePerson() {
14        $("person").action = "jLynxServlet/action/delete"
15        $("person").request()
16    }
17    script>

唉，其实一直都没觉得吧action的路径放到js里是个好的解决方法……

总的说来，感觉没有官方说的那么牛……

崔振 2007-08-31 02:09 发表评论

BlogJava-狐狸&花生-随笔分类-我看的

我看 jLynx