<dependency>  
  <groupId>org.mybatis.spring.boot</groupId>  
  <artifactId>mybatis-spring-boot-starter</artifactId>  
  <version>1.1.1</version>  
</dependency>

spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/city?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = mysql

mybatis.type-aliases-package=com.test.demo.model

@SpringBootApplication
@MapperScan("com.test.demo.dao")
public class Application {
  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }
}

@Mapper
public interface CityMapper {
  @Select("select * from city where state = #{state}")
  City findByState(@Param("state") String state);
}

mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

mybatis.config-locations=classpath:mybatis/mybatis-config.xml

<configuration>
  <typeAliases>
    <typeAlias alias="Integer" type="java.lang.Integer" />
    <typeAlias alias="Long" type="java.lang.Long" />
    <typeAlias alias="HashMap" type="java.util.HashMap" />
    <typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" />
    <typeAlias alias="ArrayList" type="java.util.ArrayList" />
    <typeAlias alias="LinkedList" type="java.util.LinkedList" />
  </typeAliases>
</configuration>

public interface CityDao {
  public City selectCityByState(String State);
}

<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.test.demo.dao.CityDao">
  <select id="selectCityByState" parameterType="String" resultType="City">
    select * from city where state = #{state}
  </select></mapper>