Spring 连接 Jdbc

<?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:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd"> <!-- bellow read only begin -->
<tx:annotation-driven transaction-manager="txManager" />

<context:property-placeholder location="classpath:/subs.properties" ignore-unresolvable="true"/>

<bean id="txManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>

<bean id="jdbcTemplate" lazy-init="true"
class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource" />
</bean>

<bean id="namedJdbcTemplate" lazy-init="true"
class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
<constructor-arg index="0" ref="dataSource" />
</bean>

<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${ddns_driverClassName}" />
<property name="url" value="${ddns_dbUrl}" />
<property name="username" value="${ddns_dbUsername}" />
<property name="password" value="${ddns_password}" />
</bean>

</beans>

public abstract class DDSDAO {

/**
* used for injecting NamedParameterJdbcTemplate.
*/
@Autowired
protected transient NamedParameterJdbcTemplate namedJdbcTemplate;

/**
* used for injecting tableSchema.
*/
@Value("${ddsSchema}")
protected String tableSchema;

protected JdbcTemplate getJdbcTemplate() {
return (JdbcTemplate) namedJdbcTemplate.getJdbcOperations();
}

}