SpringBoot Service和Dao的编写详解

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

配置环境

创建数据库

数据库中文编码

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;

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

# mysqlspring.datasource.driver-class-name=com.mysql.cj.jdbc.Driverspring.datasource.url=jdbc:mysql://localhost:3306/rxguo_test?serverTimezone=UTC&characterEncoding=utf8&useSSL=falsespring.datasource.username=rootspring.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;@RestControllerpublic 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;@Servicepublic 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@Repositorypublic interface StudentMapper { @Select('select * from student where id = #{id}') Student getStudentById(Integer id);}

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