如何使用camel创建数据源？

Question

我刚开始学习Apache Camel.我理解了路由和组件的基础知识.现在我想通过连接到Oracle数据库,从一个特定的表读取记录并使用File组件将这些记录写入文件来尝试.要从数据库中读取,我假设我需要使用JDBC组件并给出dataSourceName.

但是,我找不到有关如何使用camel创建dataSource的任何信息.我发现与此主题相关的所有信息都使用Spring DSL示例.我不使用Spring,我只需要使用简单的独立Java应用程序来测试它.

我正在使用JDK7u25和Apache Camel 2.12.1.

有人可以发布样本从oracle表中读取并写入文件吗？

[编辑]

在网上查看了几个解决方案之后,我开始了解以下两种方法:

1. 骆驼独立运行.这是我的代码:

   import javax.sql.DataSource;    
   import org.apache.camel.main.Main;
   import org.apache.camel.builder.RouteBuilder;
   import org.apache.commons.dbcp.BasicDataSource;
   
   public class JDBCExample {
   
       private Main main;
   
       public static void main(String[] args) throws Exception {
           JDBCExample example = new JDBCExample();
           example.boot();
       }
   
       public void boot() throws Exception {
           // create a Main instance
           main = new Main();
           // enable hangup support so you can press ctrl + c to terminate the JVM
           main.enableHangupSupport();
   
           String url = "jdbc:oracle:thin:@MYSERVER:1521:myDB";
           DataSource dataSource = setupDataSource(url);
   
           // bind dataSource into the registery
           main.bind("myDataSource", dataSource);
   
           // add routes
           main.addRouteBuilder(new MyRouteBuilder());
   
           // run until you terminate the JVM
           System.out.println("Starting Camel. Use ctrl + c to terminate the JVM.\n");
           main.run();
       }
   
       class MyRouteBuilder extends RouteBuilder {
           public void configure() {
               String dst = "C:/Local Disk E/TestData/Destination";
               from("direct:myTable")
                  .setBody(constant("select * from myTable"))
                  .to("jdbc:myDataSource")
                   .to("file:" + dst);
           }
       }
   
       private DataSource setupDataSource(String connectURI) {
           BasicDataSource ds = new BasicDataSource();
           ds.setDriverClassName("oracle.jdbc.driver.OracleDriver");
           ds.setUsername("sa");
           ds.setPassword("devon1");
           ds.setUrl(connectURI);
           return ds;
       }
   }
   

2. 使用Claus lbsen提到的方法.这是代码:

   import javax.sql.DataSource;
   import org.apache.camel.CamelContext;
   import org.apache.camel.impl.DefaultCamelContext;
   import org.apache.camel.impl.SimpleRegistry;
   import org.apache.camel.main.Main;
   import org.apache.camel.builder.RouteBuilder;
   import org.apache.commons.dbcp.BasicDataSource;
   
   public class JDBCExample {
   
       private Main main;
   
       public static void main(String[] args) throws Exception {
           String url = "jdbc:oracle:thin:@MYSERVER:1521:myDB";
           DataSource dataSource = setupDataSource(url);
   
           SimpleRegistry reg = new SimpleRegistry() ;
           reg.put("myDataSource",dataSource);
   
           CamelContext context = new DefaultCamelContext(reg);
           context.addRoutes(new JDBCExample().new MyRouteBuilder());
           context.start();
           Thread.sleep(5000);
           context.stop();
       }
   
       class MyRouteBuilder extends RouteBuilder {
           public void configure() {
               String dst = "C:/Local Disk E/TestData/Destination";
               from("direct:myTable")
                  .setBody(constant("select * from myTable"))
                  .to("jdbc:myDataSource")
                   .to("file:" + dst);
           }
       }
   
       private static DataSource setupDataSource(String connectURI) {
           BasicDataSource ds = new BasicDataSource();
           ds.setDriverClassName("oracle.jdbc.driver.OracleDriver");
           ds.setUsername("sa");
           ds.setPassword("devon1");
           ds.setUrl(connectURI);
           return ds;
       }
   }
   

但在这两种情况下,我都会遇到异常:

Caused by: org.apache.camel.ResolveEndpointFailedException: Failed to resolve endpoint: jdbc://myDataSource due to: No component found with scheme: jdbc
    at org.apache.camel.impl.DefaultCamelContext.getEndpoint(DefaultCamelContext.java:534)
    at org.apache.camel.util.CamelContextHelper.getMandatoryEndpoint(CamelContextHelper.java:63)
    at org.apache.camel.model.RouteDefinition.resolveEndpoint(RouteDefinition.java:192)
    at org.apache.camel.impl.DefaultRouteContext.resolveEndpoint(DefaultRouteContext.java:106)
    at org.apache.camel.impl.DefaultRouteContext.resolveEndpoint(DefaultRouteContext.java:112)
    at org.apache.camel.model.SendDefinition.resolveEndpoint(SendDefinition.java:61)
    at org.apache.camel.model.SendDefinition.createProcessor(SendDefinition.java:55)
    at org.apache.camel.model.ProcessorDefinition.makeProcessor(ProcessorDefinition.java:500)
    at org.apache.camel.model.ProcessorDefinition.addRoutes(ProcessorDefinition.java:213)
    at org.apache.camel.model.RouteDefinition.addRoutes(RouteDefinition.java:909)
    ... 12 more
[Thread-0] INFO org.apache.camel.main.MainSupport$HangupInterceptor - Received hang up - stopping the main instance.

Answer 1

有一个SQL示例,它显示了如何设置a DataSource

• http://camel.apache.org/sql-example.html

是的,使用Spring XML的例子.但是,如何设置DataSource也可以在Java代码中完成.然后,您需要在Camel注册表中注册DataSource.

例如,您可以使用JndiRegistry或SimpleRegistry.后者更容易.

下面是一些伪代码,显示了创建注册表的原理,将bean添加到此注册表中,然后将注册表提供给构造函数DefaultCamelContext.

SimpleRegistry registry = new SimpleRegistry();

// code to create data source here
DateSource ds = ...

registry.put("myDataSource", ds);

CamelContext camel = new DefaultCamelContext(registry);

Answer 2

我真是太傻了！我没有在 CLASSPATH 中包含camel-jdbc-2.12.1.jar。现在上面的例子可以工作了。