Spring Boot整合Mybatis【超详细】

配置文件形式

pom.xml

<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>4.0.0modelVersion>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.4.4version>
        <relativePath/> 
    parent>
    <groupId>com.keafmdgroupId>
    <artifactId>spring-boot-09-mybatisartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <name>spring-boot-09-mybatisname>
    <description>Demo project for Spring Bootdescription>
    <properties>
        <java.version>1.8java.version>
    properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-jdbcartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>org.mybatis.spring.bootgroupId>
            <artifactId>mybatis-spring-boot-starterartifactId>
            <version>1.3.2version>
        dependency>

        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <scope>runtimescope>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            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。

<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

以上就是Spring Boot整合Mybatis【超详细】的全部内容。

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加油！

共同努力！

Keafmd