【MyBatis】＜typeAliases＞ --（别名处理器 ）

为Java类型起个短名，避免resultType引用javabean全限定类名

public class Employee { 
	
	private Integer id;
	private String lastName; 
	private String email;
	private String gender;
}

public interface EmployeeMapper {
	public Employee getEmpById(Integer id);
}

public class MyBatisTest {
	@Test	
	public void test() throws IOException {
		SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
		SqlSession openSession = sqlSessionFactory.openSession();
		EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class);
		try {
			Employee employee = mapper.getEmpById(1); 
			System.out.println(employee);
		} finally {
			openSession.close();
		}

	}
}

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=root

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.mybatis.dao.EmployeeMapper">
	<select id="getEmpById" resultType="employee">
		select * from tbl_employee where id = #{id}
	</select>
</mapper>

<?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="dbconfig.properties"></properties>

<settings>
  <setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>

<typeAliases>
  <typeAlias type="com.mybatis.bean.Employee"/>
</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="EmployeeMapper.xml" />
	</mappers>
</configuration>