SpringBoot + Mybatis增删改查实战记录

server:
 port: 8080

spring:
 datasource:
 name:
 url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&serverTimezone=UTC
 username: root
 password: root

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

package com.ljsh.test.model;

public class Person {
 /*
 {id} 自增主键
 {name} 人员姓名
 {mobile} 人员电话
  */
 private int id;
 private String name;
 private String mobile;
 
 // 右键 Generate -> Setter and Getter -> Shift全选 -> ok 生成如下代码

 public int getId() {
  return id;
 }

 public void setId(int id) {
  this.id = id;
 }

 public String getName() {
  return name;
 }

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

 public String getMobile() {
  return mobile;
 }

 public void setMobile(String mobile) {
  this.mobile = mobile;
 }
 
 // 右键 Generate -> toString() -> 全选 -> ok 生成如下代码

 @Override
 public String toString() {
  return "Person{" +
    "id=" + id +
    ", name='" + name + '\'' +
    ", mobile='" + mobile + '\'' +
    '}';
 }
}

package com.ljsh.test.dao;

import com.ljsh.test.model.Person;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;

@Mapper
public interface PersonDao {
  /*
  查所有
  return List<Person>
   */
  List<Person> getAll();

  /*
  根据ID查询
  {id} 要查询人员的 id
   */
  Person getPersonByID(int id);
  
  /*
  删除
  {id} 要删除人员的 id
   */
  void delete(int id);

  /*
  更新
  {p} 要更新的Person实例
   */
  void update(Person p);

  /*
  增加
  {p} 要新增的Person实例
   */
  void newp(Person p);
}

<?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" >
<!-- 这里填写对应的Dao文件所在的路径 -->
<mapper namespace="com.ljsh.test.dao.PersonDao"  >
  <!-- 填写数据库里实例Person对应的表的表名 -->
  <!-- 这里是作为一个变量使用 -->
  <sql id="table">person</sql>

  <!-- id属性填写Dao文件里的函数名称 xxType是参数或是结果的类型根据情况填写 -->
  <!-- 查询所有  -->
  <select id="getAll" resultType="com.ljsh.test.model.Person">
    SELECT
    *
    FROM
    <include refid="table" />
  </select>


  <!-- 根据id查询 -->
  <select id="getPersonById" resultType="com.ljsh.test.model.Person">
    SELECT
    *
    FROM
    <include refid="table"/>
    WHERE
    id = #{id}
  </select>

  <!-- 增 -->
  <insert id="newp" parameterType="com.ljsh.test.model.Person">
    INSERT INTO
    <include refid="table"/>
    (name,phone)
    VALUES
    (#{name},#{phone})
  </insert>

  <!-- 改 -->
  <update id="update" parameterType="com.ljsh.test.model.Person">
    UPDATE
    <include refid="table"/>
    SET
    <!--<if test="name != null">name = #{name}</if>-->
    name = #{name},phone = #{phone},status = #{status}
    WHERE
    id = #{id}
  </update>

  <!-- 删 -->
  <delete id="delete" parameterType="com.ljsh.test.model.Person">
    DELETE FROM
    <include refid="table"/>
    WHERE
    id = #{id}
  </delete>
</mapper>

package com.ljsh.test.service;
import com.ljsh.test.dao.PersonDao;
import com.ljsh.test.model.Person;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class PersonService {
  @Autowired
  PersonDao personDao;

  /*
    Service层介于controller和dao之间作为服务层进行一些逻辑处理，
    这里逻辑太简单所以知识单纯调用dao所以不做注释
   */
  public List<Person> getAll(){
    return personDao.getAll();
  }

  public Person getPersonByID(int id){
    return personDao.getPersonByID(id);
  }

  public void delete(int id){
    personDao.delete(id);
  }

  public void update(Person p){
    personDao.update(p);
  }

  public void newp(Person p){
    personDao.newp(p);
  }
}

package com.ljsh.test.controller;

import com.ljsh.test.model.Person;
import com.ljsh.test.service.PersonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import java.util.List;

@Controller
public class PersonController {

  @Autowired
  PersonService personService;

  // 设置访问路由值为路径
  @RequestMapping("/")
  public ModelAndView index(){
    // 顾名思义 实体和数据 同时返回页面模板和数据
    ModelAndView mav = new ModelAndView("index");
    List<Person> list = personService.getAll();
    mav.addObject("list",list);
    return mav;
  }
}

<!DOCTYPE html>
<html lang="en">
<!-- -->
<!-- 使用thymeleaf需引入 -->
<html xmlns:th="http://www.thymeleaf.org">
<head>
</head>
<body>
<div id="tableP">
    <table>
      <caption>人员信息</caption>
      <tr>
        <th>Name</th>
        <th>Phone</th>
      </tr>
      <!-- 通过th命令使用一些操作 -->
      <!-- 通过${} 使用变量 -->
      <tr th:each="item: ${list}">
        <td th:text="${{item.name}}">还没有任何人员信息哦</td>
        <td th:text="${{item.mobile}}">你是不是想独吞奖品</td>
      </tr>
    </table>
  </div>
</div>
</body>
</html>