1、SpringBoot+Mybatis整合------简单CRUD的实现

编译工具：STS

　　　　代码下载链接：https://github.com/theIndoorTrain/SpringBoot_Mybatis01/commit/b757cd9bfa4e2de551b2e9e5c095ded585c90566

一、项目的建立

选择依赖：Mybatis，Web，MySql，JDBC

SpringBoot版本：2.0.3

项目生成结构：

pom依赖：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xm</groupId>
    <artifactId>demo005_Mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo005_Mybatis</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

---

二、创建数据库

三、项目配置

1.添加yml配置文件：application.yml

#配置mybatis
mybatis:
  #配置xml映射路径
  mapper-locations: classpath:mapper/*.xml
   #配置实体类的别名
  type-aliases-package: com.xm.pojo
  configuration:
    #开启驼峰命名法
    map-underscore-to-camel-case: true
    

#配置mysql连接
spring:
  datasource:
    url: jdbc:mysql://10.1.51.31:3306/xm
    username: root
    password: cube1501
    driver-class-name: com.mysql.jdbc.Driver

2.在source文件夹下建立mapper文件夹

3.在Springboot启动类添加@MapperScan注解

package com.xm;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@MapperScan(value="com.xm.mapper")
@SpringBootApplication
public class Demo005MybatisApplication {

    public static void main(String[] args) {
        SpringApplication.run(Demo005MybatisApplication.class, args);
    }
}

注意：添加@MapperScan注解后，每个mapper都会自动扫描成为Bean。否则，需要在每个mapper接口上添加@Mapper接口

四、代码实现

1.实体类Student

package com.xm.pojo;

/**
 * name:学生实体
 * @author xxm
 *
 */
public class Student {
    /**
     * content:主键id
     */
    private int id;
    /**
     * content:姓名
     */
    private String name;
    
    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;
    }
    
    

}

 2.数据操作层StudentMapper

　　　　　　　　　

package com.xm.mapper;

import java.util.List;

import com.xm.pojo.Student;

public interface StudentMapper {

    /**
     * 根据id查询
     * @param id
     * @return
     */
    public Student getById(Integer id);
    
    /**
     * 查询全部
     * @return
     */
    public List<Student> list();
    
    /**
     * 插入
     * @param student
     */
    public void insert(Student student);
    
    /**
     * 根据student的id修改
     * @param student
     */
    public void update(Student student);
    
    /**
     * 根据id删除
     * @param id
     */
    public void delete(Integer id);
    
}

3.mapper映射Studentmapper

<?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.xm.mapper.StudentMapper">

    <!-- 根据id查询 -->
    <select id="getById" parameterType="int" resultType="student">
    select * from student where id=#{id}
    </select>
    
    <!-- 查询所有 -->
    <select id="list" parameterType="int" resultType="student">
    select * from student
    </select>
    
    <!-- 插入一个学生 -->
    <insert id="insert" parameterType="student">
    insert into student(name) values(#{name})
    </insert>
    
    <!-- 根据id修改学生信息 -->
    <update id="update" parameterType="student">
    update student set name=#{name} where id=#{id}
    </update>
    
    <!-- 根据id删除学生 -->
    <delete id="delete" parameterType="int">
    delete  from student where id=#{id}
    </delete>
</mapper>

4.控制层StudentController

　　　　　　　　

package com.xm.controller;

import java.util.List;

import javax.websocket.server.PathParam;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RestController;

import com.xm.mapper.StudentMapper;
import com.xm.pojo.Student;

@RestController
public class StudentController {
    @Autowired
    private StudentMapper studentMapper;
    
    /**
     * 根据id查询学生
     * @param id
     * @return
     */
    @GetMapping("/student/{id}")
    public Student getById(@PathVariable("id") Integer id) {
        
        Student student = studentMapper.getById(id);
        return student;
        
    }
    
    /**
     * 查询全部
     * @return
     */
    @GetMapping("/students")
    public List<Student> list(){
        List<Student> students = studentMapper.list();
        return students;
    }
    
    /**
     * 插入
     * @param student
     */
    @PostMapping("/student")
    public void insert( Student student) {
        studentMapper.insert(student);
    }
    
    /**
     * 修改
     * @param student
     */
    @PutMapping("/student/{id}")
    public void update(Student student,@PathVariable("id")Integer id) {
        studentMapper.update(student);
    }
    
    /**
     * 根据id删除
     * @param id
     */
    @DeleteMapping("/student/{id}")
    public void delete(@PathVariable("id") Integer id) {
        studentMapper.delete(id);
    }

}

 

2018-06-1517:31:14