准备工作
这里我们使用spring boot和thymeleaf编写一个增删改查的示例。
创建一个spring boot模块，里面勾选上Lombok，web，Thymeleaf，mysql，mybatis。
这里还是使用之前的t_user表，下面是建表语句：
CREATE TABLE `t_user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(45) DEFAULT NULL,
`phone` varchar(20) DEFAULT NULL,
`address` varchar(45) DEFAULT NULL,
`birthday` date DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8;
这里使用mybatis generator生成相应的文件，我们把mapper文件放到resource目录下，这样就不用在pom文件中添加标签将xml文件编译到target目录下了。
mapper
<?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.monkey1024.crud.mapper.StudentMapper">
<!--查询多条数据-->
<!--resultType是数据返回放到哪个类型中-->
<select id="selectAllStudent" resultType="com.monkey1024.crud.bean.Student">
SELECT id,name,age,score FROM t_student
</select>
<select id="selectStudentById" resultType="com.monkey1024.crud.bean.Student">
SELECT id,name,age,score FROM t_student WHERE id=#{id}
</select>
<!--修改-->
<update id="updateStudent">
UPDATE t_student SET name=#{name},age=#{age},score=#{score} WHERE id=#{id}
</update>
<!--删除-->
<delete id="deleteStudent">
DELETE FROM t_student Where id=#{id}
</delete>
<!--新增-->
<insert id="addStudent">
INSERT INTO t_student(name,age,score) VALUES (#{name},#{age},#{score})
<selectKey resultType="int" keyProperty="id" order="AFTER">
SELECT @@identity
</selectKey>
</insert>
</mapper>
dao
@Mapper//在dao接口上加入Mapper注解，这样springboot就可以扫描到
public interface StudentMapper {
List<Student> selectAllStudent();
Student selectStudentById(Integer id);
void addStudent(Student student);
void updateStudent(Student student);
void deleteStudent(Integer id);
}
service实现类
@Service
public class StudentServiceImpl implements StudentService {
@Autowired
private StudentMapper studentMapper;
@Override
public List<Student> selectAllStudent() {
return studentMapper.selectAllStudent();
}
@Override
public Student selectStudentById(Integer id) {
return studentMapper.selectStudentById(id);
}
@Override
public void addStudent(Student student) {
studentMapper.addStudent(student);
}
@Override
public void updateStudent(Student student) {
studentMapper.updateStudent(student);
}
@Override
public void deleteStudent(Integer id) {
studentMapper.deleteStudent(id);
}
}
controller
@Controller
public class StudentController {
@Autowired
private StudentService studentService;
/**
* 查询全部数据
* @param model
* @return
*/
@RequestMapping("/index")
public String index(Model model) {
List<Student> studentList = studentService.selectAllStudent();
model.addAttribute("studentList", studentList);
return "index";
}
/**
* 去修改页面
* @param id
* @param model
* @return
*/
@RequestMapping("/student/toUpdate")
public String toUpdate(@RequestParam(value = "id") Integer id,Model model) {
Student student = studentService.selectStudentById(id);
model.addAttribute("student", student);
return "student";
}
/**
* 去添加页面
* @return
*/
@RequestMapping("/student/toAdd")
public String toAdd(){
return "student";
}
/**
* 添加或修改
* @param student
* @return
*/
@RequestMapping("/student/addOrUpdate")
public String addOrUpdate(Student student) {
if (student.getId() == null){
//添加
studentService.addStudent(student);
}else {
//修改
studentService.updateStudent(student);
}
return "redirect:/index";
}
/**
* 删除
* @param id
* @return
*/
@RequestMapping("/student/delete")
public String delete(@RequestParam("id") Integer id){
studentService.deleteStudent(id);
return "redirect:/index";
}
}
yml配置文件
spring:
datasource:
username: root
password: 111111
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai
type: com.alibaba.druid.pool.DruidDataSource
thymeleaf:
cache: false
mode: LEGANCYHTML5
mybatis:
type-aliases-package: com.monkey1024.bean
mapper-locations: classpath:mappers/*.xml
#打印日志
logging:
level:
com.monkey1024.mapper: debug
前台index.html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8"/>
<link rel="stylesheet" href="/css/bootstrap.min.css"/>
<script src="/js/jquery.min.js"></script>
<script src="/js/bootstrap.min.js"></script>
<title>Title</title>
</head>
<body style="'margin:50px;'">
<div><a href="/student/toAdd">添加用户</a></div>
<table class="table table-striped">
<thead>
<tr>
<th>序号</th>
<th>姓名</th>
<th>年龄</th>
<th>分数</th>
</tr>
</thead>
<tbody>
<tr th:each="stu:${studentList}">
<td th:text="${stuStat.count}">1</td>
<td th:text="${stu.name}">jack</td>
<td th:text="${stu.age}">11</td>
<td th:text="${stu.score}">98</td>
<td>
<a th:href="@{/student/toUpdate(id=${stu.id})}">修改</a>
<a th:href="@{/student/delete(id=${stu.id})}">删除</a>
</td>
</tr>
</tbody>
</table>
</body>
</html>
前台Student.html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8"/>
<link rel="stylesheet" href="/css/bootstrap.min.css"/>
<script src="/js/jquery.min.js"></script>
<script src="/js/bootstrap.min.js"></script>
<title>Title</title>
</head>
<body th:style="'margin:50px;'">
<form action="/student/addOrUpdate" class="form-horizontal" role="form" method="post">
<div class="form-group">
<label for="name" class="col-sm-2 control-label">姓名</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="name" name="name" placeholder="请输入姓名" th:value="${student?.name}"/>
</div>
</div>
<div class="form-group">
<label for="age" class="col-sm-2 control-label">年龄</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="age" name="age" placeholder="请输入年龄" th:value="${student?.age}"/>
</div>
</div>
<div class="form-group">
<label for="score" class="col-sm-2 control-label">分数</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="score" name="score" placeholder="请输入分数" th:value="${student?.score}"/>
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<input type="hidden" id="id" name="id" th:value="${student?.id}"/>
<button type="submit" class="btn btn-default">提 交</button>
</div>
</div>
</form>
</body>
</html>