Mybatis 如何在配置文件中给实体类起别名

<select id="getTeacherById" parameterType="integer" resultType="entity.Teacher">

    <typeAliases>
        <typeAlias type="entity.Teacher" alias="ss"/>
    </typeAliases>

<typeAliases>   
        <package name="entity"/>
    </typeAliases>

@Alias("ss")
public class Teacher {

public Configuration() {
 typeAliasReGIStry.registerAlias("JDBC", JdbcTransactionFactory.class);
    typeAliasRegistry.registerAlias("MANAGED", ManagedTransactionFactory.class);
    typeAliasRegistry.registerAlias("JNDI", JndiDataSourceFactory.class);
    typeAliasRegistry.registerAlias("POOLED", PooledDataSourceFactory.class);
    typeAliasRegistry.registerAlias("UNPOOLED", UnpooledDataSourceFactory.class);
    typeAliasRegistry.registerAlias("PERPETUAL", PerpetualCache.class);
    typeAliasRegistry.registerAlias("FIFO", FifoCache.class);
    typeAliasRegistry.registerAlias("LRU", LruCache.class);
    typeAliasRegistry.registerAlias("SOFT", SoftCache.class);
    typeAliasRegistry.registerAlias("WEAK", WeakCache.class);
    typeAliasRegistry.registerAlias("DB_VENDOR", VendorDatabaseIdProvider.class);
    typeAliasRegistry.registerAlias("XML", XMLLanguageDriver.class);
    typeAliasRegistry.registerAlias("RAW", RawLanguageDriver.class);
    typeAliasRegistry.registerAlias("SLF4J", Slf4jImpl.class);
    typeAliasRegistry.registerAlias("COMMONS_LOGGING", JakartaCommonsLoggingImpl.class);
    typeAliasRegistry.registerAlias("LOG4J", Log4jImpl.class);
    typeAliasRegistry.registerAlias("LOG4J2", Log4j2Impl.class);
    typeAliasRegistry.registerAlias("jdk_LOGGING", Jdk14LoggingImpl.class);
    typeAliasRegistry.registerAlias("STDOUT_LOGGING", StdOutImpl.class);
    typeAliasRegistry.registerAlias("NO_LOGGING", NoLoggingImpl.class);
    typeAliasRegistry.registerAlias("CGLIB", CglibProxyFactory.class);
    typeAliasRegistry.registerAlias("JAVASSIST", JavassistProxyFactory.class);

<?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>
    <!--typeAlias用于配置别名。type属性指定的是实体类全限定类名。alias属性指定别名，当指定了别名就不区分大小写，linux中仍然区分大小写，且typeAlias标签必须放在properties后面-->
    <properties resource="jdbcConfig.properties">
    </properties>
    <typeAliases>
        <package name="domain"></package>
    </typeAliases>
    <!--配置环境-->
    <environments default="Mysql">
        <!--配置mysql的环境-->
        <environment id="mysql">
            <!--配置事务的类型-->
            <transactionManager type="JDBC">
            </transactionManager>
            <!--配置数据源(连接池)-->
            <dataSource type="POOLED">
                <!--配置连接数据库的4个基本信息-->
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="passWord" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
    <!--指定映射配置文件的位置，映射配置文件指的是每个dao独立的配置文件
        如果是用注解来配置的话，此处应该使用class属性指定被注解的dao全限定类名
    -->
    <mappers>
        <package name="dao"/>
    </mappers>
</configuration>