springboot整合mybatis之二：mapper.xml文件位置

<?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>
    <!-- 配置全局属性 -->
    <settings>
        <!-- 使用jdbc的getGeneratedKeys获取数据库自增主键值 -->
        <setting name="useGeneratedKeys" value="true" />

        <!-- 使用列别名替换列名 默认:true -->
        <setting name="useColumnLabel" value="true" />

        <!-- 开启驼峰命名转换:Table{create_time} -> Entity{createTime} -->
        <setting name="mapUnderscoreToCamelCase" value="true" />

        <!-- 打印查询语句 -->
        <setting name="logImpl" value="STDOUT_LOGGING" />
    </settings>

    <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>

    <!--以下已经在application.yml中配置过了-->
    <!--
    <environments default="development">
        <environment id="development">
            # 使用JDBC事务管理
            <transactionManager type="JDBC" />
            # 数据库连接池
            <dataSource type="POOLED">
                <property name="driver" value="org.gjt.mm.mysql.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis "/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    -->
    <!--
    <typeAliases>
        <package name="com.example.mybatis01.entity"/>
    </typeAliases>
    <mappers>
        <mapper resource="mapper/*.xml"/>
    </mappers>
    -->
</configuration>

package com.example.mybatis01.mapper;

import com.example.mybatis01.entity.Dept;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import java.util.List;

//@Mapper
public interface DeptMapper {

   public  List<Dept>  queryAllDepts();

   @Select("select deptno,dname,loc from dept where deptno=#{deptno}")
   Dept findOneDept(@Param("deptno") String deptno);

   @Insert("insert into dept (deptno,dname,loc) values (#{deptno},#{dname},#{loc})")
   void insertDept(String deptno,String dname,String loc);

   List<Dept> getAll();
   Dept getOne(String deptno);
   void insert(Dept dept);
   void update(Dept dept);
   void delete(String deptno);

}

<?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.example.mybatis01.mapper.DeptMapper">
    <resultMap id="dept" type="com.example.mybatis01.entity.Dept">
        <result column="deptno" property="deptno"></result>
        <result column="dname" property="dname"></result>
        <result column="loc" property="loc"></result>
    </resultMap>
    
    <sql id="base-columns">
        deptno,dname,loc
    </sql>
    <select id="queryAllDepts" resultMap="dept">
        select deptno,dname,loc from dept
    </select>

    <select id="getAll" resultMap="dept">
        select
        <include refid="base-columns"></include>
        from dept
    </select>

    <select id="getOne" resultMap="dept" parameterType="java.lang.String">
        select
        <include refid="base-columns"></include>
        from dept
        where deptno=#{deptno}
    </select>

    <insert id="insert" parameterType="com.example.mybatis01.entity.Dept">
        insert into dept (deptno,dname,loc) values (#{deptno},#{dname},#{loc})
    </insert>

    <update id="update" parameterType="com.example.mybatis01.entity.Dept">
    update dept set
        <if test="dname!=null and dname!=''">dname=#{dname},</if>
        <if test="loc!=null and loc!=''">loc=#{loc},</if>
        deptno=#{deptno}
     where  deptno = #{deptno}
    </update>

    <delete id="delete" parameterType="java.lang.String">
        delete from dept where  deptno = #{deptno}
    </delete>

</mapper>