【皇甫】☀那些数据源...

几种数据源

Test：

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 1 <!-- 1.dao -->   
 2    <bean id="bookDao" class="cn.happy.dao.impl.BookDAOImpl">
 3      <!--  <property name="jdbcTemplate" ref="myJDBCTemplate"></property> -->
 4      <property name="dataSource" ref="dataSource"></property>
 5    </bean>
 6    
 7     <!-- 2.service -->  
 8      <bean id="bookService" class="cn.happy.service.impl.BookServiceImpl">
 9         <property name="dao" ref="bookDao"></property>
10      </bean>
11      
12      <!-- c3p0数据源 -->
13    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
14       <property name="driverClass" value="${jdbc.driver}"></property>
15       <property name="jdbcUrl" value="${jdbc.url}"></property>
16       <property name="user" value="${jdbc.username}"></property>
17       <property name="password" value="${jdbc.password}"></property>
18    </bean> 
19    
20    <!-- 4.注册jdbc属性 -->
21    <context:property-placeholder location="classpath:jdb.properties"/>
22 
23   <!-- 5.注册jdbcTemplate -->
24  <!--  <bean id="myJDBCTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
25        <property name="dataSource" ref="dataSource"></property>
26   </bean> -->
27    
28     <!-- 3.注册数据源  spring -->
29   <!--  <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
30       <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
31       <property name="url" value="jdbc:mysql:///BookShop"></property>
32       <property name="username" value="root"></property>
33       <property name="password" value="root"></property>
34    </bean> -->
35    
36     <!-- 3.注册数据源  dbcp -->
37   <!--   <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
38       <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
39       <property name="url" value="jdbc:mysql:///BookShop"></property>
40       <property name="username" value="root"></property>
41       <property name="password" value="root"></property>
42    </bean>  -->
43    
44    
45 
46   <!-- 4.注册jdbc属性 -->
47   <!--  <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
48      <property name="location" value="classpath:jdb.properties"></property>
49    </bean> -->

applicationContext

<!-- 1.dao -->   
    <bean id="bookDao" class="cn.happy.dao.impl.BookDAOImpl"></bean>
   
   
    <!-- 2.service -->  
     <bean id="bookService" class="cn.happy.service.impl.BookServiceImpl">
        <property name="dao" ref="bookDao"></property>
     </bean>

子层里的applicationContext