SpringBoot 整合 MyBatis

SpringBoot 整合 MyBatis

1、在pom.xml 配置依赖

<?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.sgg</groupId>
    <artifactId>springboot_mybatis</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <!-- 继承父包 2.0.7.RELEASE 子依赖版本与父版本一致 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.7.RELEASE</version>
    </parent>

    <name>springboot_mybatis Maven Webapp</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <!-- web启动jar包 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--mybatis 提供springboot整合的依赖-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!-- 导入MySQL-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.15</version>
        </dependency>
        <!-- 导入lombok(实体类可以不用写get set 方法) -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.6</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <finalName>springboot_mybatis</finalName>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.22.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>3.2.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

2、yml 配置

server:
  port: 8081
spring:
  datasource:
    url: jdbc:mysql://localhost:3307/login_jdbc?useUnicode=true&characterEncoding=UTF-8
    username: root
    password: 123
    driver-class-name: com.mysql.jdbc.Driver
mybatis:
  mapper-locations: classpath:/mapping/*.xml
  type-aliases-package: com.sgg.entity

3、实体类

package com.sgg.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.hibernate.validator.constraints.Length;

import javax.validation.constraints.Min;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.NotNull;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Integer id;
    private String name;
    private int age;
}

4、repository 代码

package com.sgg.repository;

import com.sgg.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public interface UserRepository {
    public List<User> findAll();
    public User findById(Integer id);
    public void save(User user);
    public void update(User user);
    public void deleteById(Integer id);
}

5、repository.xml 代码

<?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.sgg.repository.UserRepository">
    <select id="findAll" resultType="User">
        select * from user
    </select>

    <select id="findById" parameterType="Integer" resultType="User">
        select * from user where id = #{id}
    </select>

    <insert id="save" parameterType="com.sgg.entity.User">
        INSERT INTO `user`(`name`,age) VALUES(#{name},#{age})
    </insert>

    <update id="update" parameterType="com.sgg.entity.User">
        UPDATE `user` SET `name`=#{name},age=#{age} WHERE id=#{id}
    </update>

    <delete id="deleteById" parameterType="Integer">
        DELETE FROM `user` WHERE id=#{id}
    </delete>

</mapper>

6、Controller 代码

package com.sgg.controller;

import com.sgg.entity.User;
import com.sgg.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/user")
public class UserHandler {

    @Autowired
    private UserRepository userRepository;

    @GetMapping("/findAll")
    public List<User> findAll(){
        return userRepository.findAll();
    }

    @GetMapping("/findById/{id}")
    public User findById(@PathVariable Integer id){
        return userRepository.findById(id);
    }

    @PostMapping("/save")
    public void save(@RequestBody User user){
        userRepository.save(user);
    }

    @PutMapping("/update")
    public void update(@RequestBody User user){
        userRepository.update(user);
    }

    @DeleteMapping("/deleteById/{id}")
    public void deleteById(@PathVariable Integer id){
        userRepository.deleteById(id);
    }

}

7、SpringBoot 启动类

package com;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

// SpringBoot的启动类
@SpringBootApplication
@MapperScan("com.sgg.repository")  //repository本来由mybatis管理，利用@MapperScan将它给spring管理
public class HelloSpringBootApplication {
    public static void main(String[] args) {
        SpringApplication.run(HelloSpringBootApplication.class,args);
    }
}

8、Postman 测试接口

接口作用：查询所有用户
接口：http://localhost:8081/user/findAll  
请求类型：GET
参数：无
结果：
    [
        {
            "id": 1,
            "name": "李世民",
            "age": 28
        },
        {
            "id": 2,
            "name": "李四",
            "age": 22
        },
        {
            "id": 3,
            "name": "王五",
            "age": 33
        },
        {
            "id": 7,
            "name": "李静",
            "age": 21
        }
    ]

接口作用：根据用户Id查询
接口：http://localhost:8081/user/findById/1  
请求类型：GET
参数：1
结果：
{
    "id": 1,
    "name": "李世民",
    "age": 28
}

接口作用：新增用户
接口：http://localhost:8081/user/save 
请求类型：POST
参数：
    {
        "name": "周杰伦",
        "age": 33
    }
结果：
	postman返回空，代表新增成功。

接口作用：根据用户id修改用户信息
接口：http://localhost:8081/user/save 
请求类型：PUT
参数：
    {
        "id":1,
        "name": "周杰伦",
        "age": 33
    }
结果：
	postman返回空，代表修改成功。

接口作用：根据用户id删除用户信息
接口：http://localhost:8081/user/deleteById/2  
请求类型：DELETE
参数：2
结果：
	postman返回空，代表删除成功。