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java那些事20240222-springBoot整合mybatis

创建项目

java那些事20240222-springBoot整合mybatis,java那些事20240222-springBoot整合mybatis_spring boot,第1张

java那些事20240222-springBoot整合mybatis,java那些事20240222-springBoot整合mybatis_User_02,第2张

目录结构

java那些事20240222-springBoot整合mybatis,java那些事20240222-springBoot整合mybatis_spring boot_03,第3张

创建一个接口mapper

package com.example.springbootmybatis.mapper;

import com.example.springbootmybatis.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

@Mapper
public interface UserMapper {
    @Select("select * from user where id=#{id}")
    public User findById(@Param("id") Integer id);
}

Userservice

package com.example.springbootmybatis.services;

import com.example.springbootmybatis.pojo.User;

public interface UserService {
    public User findById(Integer id);
}

UserserviceImpl

package com.example.springbootmybatis.services.impl;

import com.example.springbootmybatis.mapper.UserMapper;
import com.example.springbootmybatis.pojo.User;
import com.example.springbootmybatis.services.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;
    @Override
    public User findById(Integer id){
        return userMapper.findById(id);
    }

}

controller层

package com.example.springbootmybatis.controller;

import com.example.springbootmybatis.pojo.User;
import com.example.springbootmybatis.services.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {
    @Autowired
    private UserService userService;
    @RequestMapping("/findById")
    public User findById(Integer id){
        return userService.findById(id);
    }
}

运行结果

java那些事20240222-springBoot整合mybatis,java那些事20240222-springBoot整合mybatis_spring_04,第4张

配置文件

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.2.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>springbootmybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springbootmybatis</name>
    <description>springbootmybatis</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
        </dependency>
<!--        mybatis以来-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>3.0.3</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </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>



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