MyBatis动态连接数据库，动态传入数据库参数

配置MyBatis时，一般都会将数据库参数放在配置文件中，如jdbc.properties，然后通过载入配置文件的方式获取参数：

<?xml version="1.0" encoding="UTF-8"?>  
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">  
<configuration>  
    <!-- 
    <properties resource="mybatis/jdbc.properties"/> 
    -->  
  
    <typeAliases>  
        <typeAlias alias="userTpm" type="com.test.tool.common.tpm.UserTpm"/>  
    </typeAliases>  
  
    <environments default="development">  
        <environment id="development">  
            <transactionManager type="JDBC"/>  
            <dataSource type="POOLED">  
                <property name="driver" value="${jdbc.driver}"/>  
                <property name="url" value="${jdbc.url}"/>  
                <property name="username" value="${jdbc.username}"/>  
                <property name="password" value="${jdbc.password}"/>  
            </dataSource>  
        </environment>  
    </environments>  
  
    <mappers>  
        <mapper resource="com/test/tool/dsm/UserDsm.xml"/>  
    </mappers>  
</configuration>  

jdbc.properties文件内容如下：

1. jdbc.driver=xxxx  
2. jdbc.url=xxxxxx  
3. jdbc.username=xxxx  
4. jdbc.password=xxxx  

现在想要 动态修改 数据库连接的参数 ，不使用jdbc.properties中的参数，代码如下：

 //动态配置数据库参数
 Properties properties = new Properties();
 properties.setProperty("jdbc.driver", "动态设置");
 properties.setProperty("jdbc.url", "动态设置");
 properties.setProperty("jdbc.username", "动态设置");
 properties.setProperty("jdbc.password", "动态设置");

 //加载mybatis配置文件和映射文件
 String resource = "mybatis/mybatis-config.xml";
 Reader reader = Resources.getResourceAsReader(resource);
 SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
 SqlSessionFactory factory = builder.build(reader, properties);
 SqlSession session = factory.openSession();
 //获取对象
 userDsm = session.getMapper(UserDsm.class);
 ......
 userDsm.addUser(...);
 ......