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SpringBoot Service和Dao的编写详解

作者：瑞 新

这篇文章主要介绍了SpringBoot Service和Dao的编写详解，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧

本文主要介绍了SpringBoot Service和Dao的编写详解，分享给大家，具体如下：

效果图

在这里插入图片描述

配置环境

创建数据库

数据库中文编码

在这里插入图片描述

建表

create table `student` (
	`id` int(11) Not NULL AUTO_INCREMENT COMMENT '主键自增id',
	`name` varchar(250) NOT NULL DEFAULT ' ' COMMENT '姓名',
	PRIMARY KEY(`id`)
)ENGINE=INNODB DEFAULT CHARSET=utf8;

在这里插入图片描述

pom依赖和配置

mybatis 和 mysql

<!--    connect-->
<!--    不同版本mybatis对应boot版本不同-->
    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>2.1.1</version>
    </dependency>
<!--    mysql版本可以不指定-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>

application.properties

# mysql
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/rxguo_test?serverTimezone=UTC&characterEncoding=utf8&useSSL=false
spring.datasource.username=root
spring.datasource.password=

java bean

package com.bennyrhys.com.shop.bean;

public class Student {
  Integer id;
  String name;

  public Integer getId() {
    return id;
  }

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

  public String getName() {
    return name;
  }

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

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

Controller

package com.bennyrhys.com.shop;

import com.bennyrhys.com.shop.bean.Student;
import com.bennyrhys.com.shop.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class StudentController {
  @Autowired
  StudentService studentService;

  @GetMapping("/student")
  public String getStudentById(@RequestParam Integer id) {
    Student student = studentService.getStudentById(id);
    return student.toString();
  }
}

Service

package com.bennyrhys.com.shop.service;

import com.bennyrhys.com.shop.bean.Student;
import com.bennyrhys.com.shop.mapper.StudentMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class StudentService {

  @Autowired
  StudentMapper studentMapper;

  public Student getStudentById(Integer id) {
    return studentMapper.getStudentById(id);
  }
}

Mapper接口

package com.bennyrhys.com.shop.mapper;

import com.bennyrhys.com.shop.bean.Student;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;


@Mapper
@Repository
public interface StudentMapper {
  @Select("select * from student where id = #{id}")
  Student getStudentById(Integer id);
}

到此这篇关于SpringBoot Service和Dao的编写详解的文章就介绍到这了,更多相关SpringBoot Service和Dao编写内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！

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