如何使用一个DataSource在Spring3.x中以编程方式更改数据库？

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/mydatabase" />
    <property name="username" value="root" />
    <property name="password" value="password" />
</bean>

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import javax.sql.DataSource;

public class DatabaseUpdater {
    private JdbcTemplate jdbcTemplate;

    @Autowired
    public void setDataSource(DataSource dataSource) {
        this.jdbcTemplate = new JdbcTemplate(dataSource);
    }

    public void updateDatabase() {
        String sql = "UPDATE mytable SET column1 = 'new value' WHERE id = 1";
        jdbcTemplate.update(sql);
    }
}