SPRING IN ACTION 第4版笔记-第三章Advancing wiring-001-DataSource在应用和开发环境之间切换 profile

一、

DataSource在应用和开发环境的产生方式不同，可以用srping 的profile管理

Spring’s solution for environment-specific beans isn’t much different from build-time
solutions. Certainly, an environment-specific decision is made as to which beans will
and won’t be created. But rather than make that decision at build time, Spring waits to
make the decision at runtime. Consequently, the same deployment unit (perhaps a
WAR file) will work in all environments without being rebuilt.
In version 3.1, Spring introduced bean profiles. To use profiles, you must gather all

二、

1.java

 package com.myapp;

 import javax.sql.DataSource;

 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Profile;
 import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
 import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
 import org.springframework.jndi.JndiObjectFactoryBean;

 @Configuration
 public class DataSourceConfig {

   @Bean(destroyMethod = "shutdown")
   @Profile("dev")
   public DataSource embeddedDataSource() {
     return new EmbeddedDatabaseBuilder()
         .setType(EmbeddedDatabaseType.H2)
         .addScript("classpath:schema.sql")
         .addScript("classpath:test-data.sql")
         .build();
   }

   @Bean
   @Profile("prod")
   public DataSource jndiDataSource() {
     JndiObjectFactoryBean jndiObjectFactoryBean = new JndiObjectFactoryBean();
     jndiObjectFactoryBean.setJndiName("jdbc/myDS");
     jndiObjectFactoryBean.setResourceRef(true);
     jndiObjectFactoryBean.setProxyInterface(javax.sql.DataSource.class);
     return (DataSource) jndiObjectFactoryBean.getObject();
   }

 }

2.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
   xmlns:jee="http://www.springframework.org/schema/jee" xmlns:p="http://www.springframework.org/schema/p"
   xsi:schemaLocation="
     http://www.springframework.org/schema/jee
     http://www.springframework.org/schema/jee/spring-jee.xsd
     http://www.springframework.org/schema/jdbc
     http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
     http://www.springframework.org/schema/beans
     http://www.springframework.org/schema/beans/spring-beans.xsd">

   <beans profile="dev">
     <jdbc:embedded-database id="dataSource" type="H2">
       <jdbc:script location="classpath:schema.sql" />
       <jdbc:script location="classpath:test-data.sql" />
     </jdbc:embedded-database>
   </beans>

   <beans profile="prod">
     <jee:jndi-lookup id="dataSource"
       lazy-init="true"
       jndi-name="jdbc/myDatabase"
       resource-ref="true"
       proxy-interface="javax.sql.DataSource" />
   </beans>
 </beans>