极简的MyBatis在Spring Boot下的配置

Posted 2020-10-17 天问

以我的一个项目为例。

0、项目结构：

1、POM中添加MyBatis的依赖：

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.1</version>
</dependency>

2、配置application.properties：

mybatis.mapper-locations=classpath:mapper/*.xml
#mybatis.type-aliases-package=com.julion.onlinestudy.domain

好吧，配置已经结束了。

接下来是一个小测试。

0、Bean文件：

  1 package com.julion.onlinestudy.domain;
  2 
  3 import com.fasterxml.jackson.annotation.JsonFormat;
  4 
  5 import java.util.Date;
  6 
  7 public class Student {
  8     private Integer id;
  9 
 10     private String username;
 11 
 12     private String password;
 13 
 14     private String name;
 15 
 16     private String gender;
 17 
 18     private String studentNo;
 19 
 20     private String grade;
 21 
 22     private String major;
 23 
 24     private Date createTime;
 25 
 26     private Date lastEditTime;
 27 
 28     public Integer getId() {
 29         return id;
 30     }
 31 
 32     public void setId(Integer id) {
 33         this.id = id;
 34     }
 35 
 36     public String getUsername() {
 37         return username;
 38     }
 39 
 40     public void setUsername(String username) {
 41         this.username = username == null ? null : username.trim();
 42     }
 43 
 44     public String getPassword() {
 45         return password;
 46     }
 47 
 48     public void setPassword(String password) {
 49         this.password = password == null ? null : password.trim();
 50     }
 51 
 52     public String getName() {
 53         return name;
 54     }
 55 
 56     public void setName(String name) {
 57         this.name = name == null ? null : name.trim();
 58     }
 59 
 60     public String getGender() {
 61         return gender;
 62     }
 63 
 64     public void setGender(String gender) {
 65         this.gender = gender == null ? null : gender.trim();
 66     }
 67 
 68     public String getStudentNo() {
 69         return studentNo;
 70     }
 71 
 72     public void setStudentNo(String studentNo) {
 73         this.studentNo = studentNo == null ? null : studentNo.trim();
 74     }
 75 
 76     public String getGrade() {
 77         return grade;
 78     }
 79 
 80     public void setGrade(String grade) {
 81         this.grade = grade == null ? null : grade.trim();
 82     }
 83 
 84     public String getMajor() {
 85         return major;
 86     }
 87 
 88     public void setMajor(String major) {
 89         this.major = major == null ? null : major.trim();
 90     }
 91 
 92     @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
 93     public Date getCreateTime() {
 94         return createTime;
 95     }
 96 
 97     public void setCreateTime(Date createTime) {
 98         this.createTime = createTime;
 99     }
100 
101     @JsonFormat(pattern="yyyy-MM-dd HH:mm:ss")
102     public Date getLastEditTime() {
103         return lastEditTime;
104     }
105 
106     public void setLastEditTime(Date lastEditTime) {
107         this.lastEditTime = lastEditTime;
108     }
109 }

1、Mapper XML文件：

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
 3 <mapper namespace="com.julion.onlinestudy.mapper.StudentMapper" >
 4   <resultMap id="BaseResultMap" type="com.julion.onlinestudy.domain.Student" >
 5     <id column="id" property="id" jdbcType="INTEGER" />
 6     <result column="username" property="username" jdbcType="VARCHAR" />
 7     <result column="password" property="password" jdbcType="VARCHAR" />
 8     <result column="name" property="name" jdbcType="VARCHAR" />
 9     <result column="gender" property="gender" jdbcType="CHAR" />
10     <result column="student_no" property="studentNo" jdbcType="VARCHAR" />
11     <result column="grade" property="grade" jdbcType="VARCHAR" />
12     <result column="major" property="major" jdbcType="VARCHAR" />
13     <result column="create_time" property="createTime" jdbcType="TIMESTAMP" />
14     <result column="last_edit_time" property="lastEditTime" jdbcType="TIMESTAMP" />
15   </resultMap>
16 
17   <sql id="Base_Column_List" >
18     id, username, password, name, gender, student_no, grade, major, create_time, last_edit_time
19   </sql>
20 
21   <select id="getOneById" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
22     select 
23     <include refid="Base_Column_List" />
24     from student
25     where id = #{id,jdbcType=INTEGER}
26   </select>
27 
28 </mapper>

 

2、Mapper文件：

 1 package com.julion.onlinestudy.mapper;
 2 
 3 import com.julion.onlinestudy.domain.Student;
 4 import org.apache.ibatis.annotations.Mapper;
 5 
 6 import java.util.List;
 7 import java.util.Map;
 8 
 9 @Mapper
10 public interface StudentMapper {
11 
12     Student getOneById(Integer id);
13 
14 }

3、Service文件：

package com.julion.onlinestudy.service;

import com.julion.onlinestudy.domain.Student;

import java.util.List;
import java.util.Map;

public interface StudentService {

    Student getOneById(Integer id);

}

4、Controller文件：

 1 package com.julion.onlinestudy.controller;
 2 
 3 import com.julion.onlinestudy.common.BaseResponse;
 4 import com.julion.onlinestudy.domain.Student;
 5 import com.julion.onlinestudy.enums.StatusCode;
 6 import com.julion.onlinestudy.service.StudentService;
 7 import org.slf4j.Logger;
 8 import org.slf4j.LoggerFactory;
 9 import org.springframework.beans.factory.annotation.Autowired;
10 import org.springframework.web.bind.annotation.*;
11 
12 import java.util.HashMap;
13 import java.util.List;
14 
15 @RestController
16 @RequestMapping("/student")
17 public class StudentController {
18 
19     private Logger logger = LoggerFactory.getLogger(this.getClass());
20 
21     @Autowired
22     private StudentService service;
23 
24     @GetMapping(value = "/one/{id}", produces = "application/json;charset=utf-8")
25     @ResponseBody
26     public Student getOneStudent(@PathVariable Integer id) {
27         logger.info("Controller--获取单个学生信息---Start");
28         Student student = service.getOneById(id);
29         logger.info("Controller--获取单个学生信息---End");
30         return student;
31     }
32 
33 }

5、测试结果：