10.30

今天实现了对于学生个人信息添加的基本功能，我使用的是springboot实现后端的代码，通过springboot加mybatis实现接口类的实现。

POJO包定义类变量以及返回值变量

1、PersonInformation.java

package com.example.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.List;

//@Data
//@NoArgsConstructor
//@AllArgsConstructor
public class PersonInformation {
    private String studentid;
    private String name;
    private Integer age;
    private String gender;
    private List<String> hobby;
    private String major;

    public PersonInformation() {
    }

    public PersonInformation(String studentid, String name, Integer age, String gender, List<String> hobby, String major) {
        this.studentid = studentid;
        this.name = name;
        this.age = age;
        this.gender = gender;
        this.hobby = hobby;
        this.major = major;
    }

    @Override
    public String toString() {
        return "PersonInformation{" +
                "studentid='" + studentid + '\'' +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", gender='" + gender + '\'' +
                ", hobby=" + hobby +
                ", major='" + major + '\'' +
                '}';
    }

    public String getStudentid() {
        return studentid;
    }

    public void setStudentid(String studentid) {
        this.studentid = studentid;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public List<String> getHobby() {
        return hobby;
    }

    public void setHobby(List<String> hobby) {
        this.hobby = hobby;
    }

    public String getMajor() {
        return major;
    }

    public void setMajor(String major) {
        this.major = major;
    }
}

2、Result.java

package com.example.pojo;

/**
 * 统一响应结果封装类
 */
public class Result {
    private Integer code ;//1 成功 , 0 失败
    private String msg; //提示信息
    private Object data; //数据 data


    public static Result success(Object data){
        return new Result(1, "success", data);
    }
    public static Result success(){
        return new Result(1, "success", null);
    }
    public static Result error(String msg){
        return new Result(0, msg, null);
    }

    public Result() {
    }

    public Result(Integer code, String msg, Object data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }

    @Override
    public String toString() {
        return "Result{" +
                "code=" + code +
                ", msg='" + msg + '\'' +
                ", data=" + data +
                '}';
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }
}

Mapper类

PersonMapper.interface

package com.example.mapper;

import com.example.pojo.PersonInformation;
import org.apache.ibatis.annotations.*;

import java.util.List;
@Mapper
public interface PersonMapper {

     PersonInformation getById(String studentid);

     PersonInformation getByName(String name);
@Update("UPDATE personinformation.person set name=#{name},age=#{age},gender=#{gender},major=#{major},hobby=#{hobby} where studentid=#{studentid}")
     void updatePerson(String studentid,  String name, Integer age, String gender,  String major,  String hobby);

     void deletePersonById(String studentid);

     List<PersonInformation> getAllPerson();

//    void insertPerson(@Param("studentid") String sutdentid, @Param("name") String name, @Param("age") Integer age, @Param("gender") String gender, @Param("major") String major, @Param("hobby") String hobby);
     @Insert("INSERT INTO personinformation.person (studentid,name, age, gender, major,hobby) VALUES (#{studentid},#{name}, #{age}, #{gender},#{major},#{hobby})")
void insertPerson( String studentid,  String name, Integer age, String gender,  String major,  String hobby);
}

Service类

package com.example.service;

import com.example.mapper.PersonMapper;
import com.example.pojo.PersonInformation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class PersonService {
    @Autowired
    private PersonMapper personMapper;

    public void addPerson(PersonInformation personInformation) {
        String studentid = personInformation.getStudentid();
        String name = personInformation.getName();
        Integer age = personInformation.getAge();
        String gender = personInformation.getGender();
        String major = personInformation.getMajor();

    }

    public PersonInformation getPersonById(String studentid) {
        return personMapper.getById(studentid);
    }

    public PersonInformation getPersonByName(String name) {
        return personMapper.getByName(name);
    }

    public void deletePersonById(String studentid) {
        personMapper.deletePersonById(studentid);
    }

    public void updatePerson(PersonInformation personInformation) {
        String studentid = personInformation.getStudentid();
        String name = personInformation.getName();
        Integer age = personInformation.getAge();
        String gender = personInformation.getGender();
        String major = personInformation.getMajor();
        String hobby = String.join(",", personInformation.getHobby());
        if (personInformation.getStudentid() != null) {
            personMapper.updatePerson(studentid, name, age, gender, major, hobby);
        } else {
            System.out.println("studentid不能为空");
        }
    }

    public List<PersonInformation> getAllPerson() {
        return personMapper.getAllPerson();
    }
}

Contorller类

PersonController.java

package com.example.controller;

import com.example.pojo.PersonInformation;
import com.example.pojo.Result;
import com.example.service.PersonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/person")
public class PersonController {
    @Autowired
    private PersonService personService;

    @GetMapping("/getAll")
    public Result getAllPersons() {

        List<PersonInformation> persons = personService.getAllPerson();
        return Result.success(persons);
    }

    @PostMapping("/add")
    public Result addPerson(@RequestBody PersonInformation personInformation) {
        try {
            System.out.println(personInformation);
            personService.addPerson(personInformation);
            return Result.success(personInformation);
        } catch (Exception e) {
            e.printStackTrace(); // 输出异常信息到控制台
            throw e; // 抛出异常以查看更多详细信息
        }
    }

    @GetMapping("/getById/{studentid}")
    public Result getById(@PathVariable String studentid) {
        PersonInformation personInformation = personService.getPersonById(studentid);
        if (personInformation != null) {
            return Result.success(personInformation);
        } else {
            return Result.error("未查询到相关信息");
        }
    }

    @GetMapping("/getByName/{name}")
    public Result getByName(@PathVariable String name) {
        PersonInformation personInformation = personService.getPersonByName(name);
        System.out.println(personInformation);
        return Result.success(personInformation);

    }

    @PutMapping("/update")
    public Result updatePerson(@RequestBody PersonInformation personInformation) {
        personService.updatePerson(personInformation);
        PersonInformation personInformation1 = personService.getPersonById(personInformation.getStudentid());
        if (personInformation1 != null) {
            return Result.success(personInformation1);
        } else {
            return Result.error("无法查询到信息，无法修改");
        }
    }

    @DeleteMapping("/delete/{studentid}")
    public Result deletePerson(@PathVariable String studentid) {
        personService.deletePersonById(studentid);
        PersonInformation personInformation = personService.getPersonById(studentid);
        if (personInformation != null) {
            return Result.success(personInformation);
        } else {
            return Result.error("并未查询到信息");
        }
    }
}

同时在资源包resources里创建一个和Mapper类相同的包位置以及名字

创建一个PersonMapper的映射类xml。

PersonMapper.XML

<?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.mapper.PersonMapper">
    <!--    <insert id="insertPerson" parameterType="com.example.pojo.PersonInformation">-->
    <!--        INSERT INTO personinformation.person (studentid,name, age, gender, major,hobby)-->
    <!--        VALUES (#{studentid},#{name}, #{age}, #{gender},#{major},#{hobby})-->
    <!--    </insert>-->
    <!--        <foreach collection="hobby" item="h" open="(" separator="," close=")">-->
    <!--            #{h}-->
    <!--        </foreach>)-->
    <!--    </insert>-->
    <resultMap id="PersonInformationResultMap" type="com.example.pojo.PersonInformation">
        <id property="studentid" column="studentid"/>
        <result property="name" column="name"/>
        <result property="age" column="age"/>
        <result property="gender" column="gender"/>
        <result property="major" column="major"/>
        <collection property="hobby" ofType="java.lang.String">
            <result column="hobby"/>
        </collection>
    </resultMap>


    <select id="getById" parameterType="java.lang.String" resultMap="PersonInformationResultMap">
        SELECT *
        FROM personinformation.person
        WHERE studentid = #{studentid}
    </select>
    <select id="getByName" parameterType="java.lang.String" resultMap="PersonInformationResultMap">
        SELECT *
        FROM personinformation.person
        WHERE name = #{name}
    </select>
    <!--    <update id="updatePerson" parameterType="com.example.pojo.PersonInformation">-->
    <!--        UPDATE personinformation.person-->
    <!--        <set>-->
    <!--            <if test="name != null">name = #{name},</if>-->
    <!--            <if test="age != null">age = #{age},</if>-->
    <!--            <if test="gender != null">gender = #{gender},</if>-->
    <!--&lt;!&ndash;            <if test="hobby != null and hobby.size() > 0">&ndash;&gt;-->
    <!--&lt;!&ndash;                hobby =&ndash;&gt;-->
    <!--&lt;!&ndash;                <foreach collection="hobby" item="h" separator=",">&ndash;&gt;-->
    <!--&lt;!&ndash;                    #{h}&ndash;&gt;-->
    <!--&lt;!&ndash;                </foreach>,&ndash;&gt;-->
    <!--&lt;!&ndash;            </if>&ndash;&gt;-->
    <!--            <if test="hobby != null">hobby = #{hobby}</if>-->
    <!--            <if test="major != null">major = #{major},</if>-->
    <!--        </set>-->
    <!--        <where>-->
    <!--            <if test="studentid != null">studentid = #{studentid}</if>-->
    <!--        </where>-->
    <!--    </update>-->
    <delete id="deletePersonById" parameterType="java.lang.String">
        DELETE
        FROM personinformation.person
        WHERE studentid = #{studentid}
    </delete>
    <select id="getAllPerson" resultMap="PersonInformationResultMap">
        SELECT *
        FROM personinformation.person
    </select>
</mapper>

当然也不要忘了配置数据库的链接

application.properties

#?????
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#???????url
spring.datasource.url=jdbc:mysql://localhost:3306/personinformation
#?????????
spring.datasource.username=root
#??
spring.datasource.password=123456789
#??mybatis?????????????
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
#kaiqi tuofengmingming zidongyingshe kaiguan
mybatis.configuration.map-underscore-to-camel-case=true

第一行的代码意思为确定我这个项目工程所需要使用的数据库驱动mysql，第二行为链接数据库的url，第三行为连接数据库的用户名，第四行为连接数据库的密码，第五行为配置mybatis框架，使得我的运行日志可以在控制台上输出出来。最后一行是自动匹配数据库表中变量与java实体类的命名不同问题，当然需要我们的实体类的命名方式严格遵循驼峰命名法。