Spring Boot整合Mybatis【超详细】

我不是女神ヾ 2022-11-17 05:26 163阅读 0赞

### pring Boot整合Mybatis ###

*  配置文件形式
 *   *  pom.xml
     *  配置数据源
     *  UserMapper.xml
     *  UserMapper
     *  配置springboot整合mybatis
     *  在运行类上添加@MapperScan注解
     *  测试类
     *  效果

# 配置文件形式 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70]

## pom.xml ##

<?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>2.4.4</version>
            <relativePath/> 
        </parent>
        <groupId>com.keafmd</groupId>
        <artifactId>spring-boot-09-mybatis</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>spring-boot-09-mybatis</name>
        <description>Demo project for Spring Boot</description>
        <properties>
            <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>

## 配置数据源 ##

**在yml文件中配置数据源。**

**application.yml：**

server:
      port: 80
    
    # 配置数据源
    spring:
      datasource:
        url: jdbc:mysql://127.0.0.1:3306/ssm-java1?useSSL=false
        driver-class-name: com.mysql.cj.jdbc.Driver
        username: root
        password: 18044229
    
    # 整合mybatis
    mybatis:
      # typeAliasesPackage: com.neuedu.entity
      mapper-locations: classpath*:com/neuedu/boot/mapper/*.xml

## UserMapper.xml ##

> **这里注意!!!:一定是和UserMapper相同的目录，是个三级目录，创建时仿照这样创建`com/keafm/mapper`(正确的) 别这样`com.keafam.mapper`(错误的)，这样错误的创建的话，是个一级目录，不是三级的，后面运行的时候可能会提示找不到Mapper。**

<?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.keafmd.mapper.UserMapper">
    
        <select id="list" resultType="map">
            select * from user
        </select>
    
    </mapper>

## UserMapper ##

package com.keafmd.mapper;
    
    import org.apache.ibatis.annotations.Mapper;
    
    import java.util.List;
    
    /** * Keafmd * * @ClassName: UserMapper * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 16:09 * @Blog: https://keafmd.blog.csdn.net/ */
    
    public interface UserMapper { 
    
        List list();
    }

## 配置springboot整合mybatis ##

**在application.yml中配置：**

# 整合mybatis
    mybatis:
      # typeAliasesPackage: com.neuedu.entity
      mapper-locations: classpath*:com/neuedu/boot/mapper/*.xml

## 在运行类上添加@MapperScan注解 ##

**SpringBoot09MybatisApplication：**

package com.keafmd;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    @MapperScan("com.keafmd.mapper")
    public class SpringBoot09MybatisApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(SpringBoot09MybatisApplication.class, args);
        }
    
    }

## 测试类 ##

**UserMapperTest ：**

package com.keafmd.mapper;
    
    import com.keafmd.SpringBoot09MybatisApplication;
    import org.junit.jupiter.api.Test;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    
    import java.util.List;
    
    import static org.junit.jupiter.api.Assertions.*;
    
    @SpringBootTest(classes = SpringBoot09MybatisApplication.class)
    class UserMapperTest { 
    
        @Autowired
        UserMapper userMapper;
    
        @Test
        void list(){ 
            List list = userMapper.list();
            for (Object o : list) { 
                System.out.println(o);
            }
        }
    
    }

## 效果 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 1]

> **以上就是Spring Boot整合Mybatis【超详细】的全部内容。**

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如果你是电脑端的话，看到右下角的 “一键三连” 了吗，没错点它\[哈哈\]**  
![在这里插入图片描述][20210115230629703.gif_pic_center]

**加油！**

**共同努力！**

**Keafmd**

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[20210115230629703.gif_pic_center]: /images/20221022/7ce54457011f43aca168687988de96e0.png