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 >