springboot整合mybatis詳細教程

1，打開idea創建springboot專案，點擊Spring Initializr

2，隨便填寫點擊next，java version是jdk版本

3，就選一個lombok，其他jar包在pom手動匯入

4，直接finish

5，在pom.xml檔案中匯入三個整合mybatis所需的依賴jar包

<?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>2.4.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ph</groupId>
    <artifactId>springboot-mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-mybatis</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- mybatis整合springboot jar包 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <!-- driud整合springboot jar包 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>

        <!-- mysql驅動 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

6，在application.yml中配置druid連接池（只是簡單配置）

spring:
  #druid連接池配置
  datasource:
    druid:
      username: root
      password: 123456
      url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
      driver-class-name: com.mysql.jdbc.Driver
      db-type: com.alibaba.druid.pool.DruidDataSource

7，創建物體類

package com.ph.springbootmybatis.entity;

import lombok.Data;

@Data
public class Student {

    private long id;
    private String name;
}

8，創建mapper介面

package com.ph.springbootmybatis.mapper;

import com.ph.springbootmybatis.entity.Student;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface StudentMapper {
    List<Student> findAll();
}

9，在啟動類上添加注解掃描（用來掃描mapper類）

package com.ph.springbootmybatis;

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

@SpringBootApplication
@MapperScan("com.ph.mapper")//掃描mapper包下的所有類
public class SpringbootMybatisApplication {

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

}

10，創建mapper.xml檔案

<?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.ph.springbootmybatis.mapper.StudentMapper">
    <select id="findAll" resultType="com.ph.springbootmybatis.entity.Student">
        select * from student
    </select>
</mapper>

11，在application.yml中配置掃描映射檔案

#配置mybatis
mybatis:
  #掃描xml檔案
  mapper-locations: classpath:mapper/*.xml
  configuration:
    #開啟駝峰命名法
    map-underscore-to-camel-case: true

12，測驗

package com.ph.springbootmybatis.mapper;

import com.ph.springbootmybatis.entity.Student;
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
class StudentMapperTest {
    @Autowired
    private StudentMapper studentMapper;

    @Test
    void findAll() {
        List<Student> students = studentMapper.findAll();
        for (Student student : students) {
            System.out.println(student);
        }
    }
}

測驗結果：

總結：

根據以上操作就能把springboot與mybatis整合，注意點就是mybatis的jar包是整合包mybatis-spring-boot-starter，然后就是在啟動類上需要加上注解@MapperScan(“mapper包的路徑”)或者在需要交給spring容器管理的mapper介面上加上@Mapper注解（以上操作中兩種方式都實作了，一種即可生效），還有application組態檔中需要配置需要掃描的mapper映射檔案的位置，mybatis的其他配置看專案需求，