HM-SpringBoot1.6【SpringBoot整合MyBatis】

 

 

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<?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>2.5.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.haifei</groupId>
    <artifactId>springboot7-mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot7-mybatis</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.0</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>

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CREATE TABLE `t_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(32) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `password` varchar(32) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

insert  into `t_user`(`id`,`username`,`password`) values (1,'zhangsan','123'),(2,'lisi','234');

 

 

 

 

 

 

 

 

 

 

 

package com.haifei.springboot7mybatis.domain;

public class User {

    private int id;
    private String username;
    private String password;

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

 

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1 纯注解开发

 

 

 

application.yml



# 一、配置datasource
spring:
  datasource:
    # url: jdbc:mysql://localhost:3306/hm_springboot
    url: jdbc:mysql://localhost:3306/hm_springboot?serverTimezone=UTC
    username: root
    password: root
    # driver-class-name: com.mysql.jdbc.Driver
    driver-class-name: com.mysql.cj.jdbc.Driver

 

 

package com.haifei.springboot7mybatis.mapper;

import com.haifei.springboot7mybatis.domain.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper
@Repository
public interface UserMapper {

    @Select("select * from t_user")
    public List<User> findAll();

}

package com.haifei.springboot7mybatis;

import com.haifei.springboot7mybatis.domain.User;
import com.haifei.springboot7mybatis.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

@SpringBootTest
class Springboot7MybatisApplicationTests {

    @Autowired
    private UserMapper userMapper; //userMapper编译异常解决：在UserMapper类上加@Repository注解

    @Test
    void findAllTest() {
        List<User> userList = userMapper.findAll();
        System.out.println(userList);
    }

}

 

 

 

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2 xml开发

 

 

 

package com.haifei.springboot7mybatis.mapper;

import com.haifei.springboot7mybatis.domain.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper
@Repository
public interface UserXmlMapper {

    public List<User> findAll();

}

<?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.haifei.springboot7mybatis.mapper.UserXmlMapper">
    <select id="findAll" resultType="user">
        select * from t_user
    </select>
</mapper>

 

application.yml



# 一、配置datasource
spring:
  datasource:
    # url: jdbc:mysql://localhost:3306/hm_springboot
    url: jdbc:mysql://localhost:3306/hm_springboot?serverTimezone=UTC
    username: root
    password: root
    # driver-class-name: com.mysql.jdbc.Driver
    driver-class-name: com.mysql.cj.jdbc.Driver

# 二、配置mybatis
mybatis:
  # config-location: # 指定mybatis的核心配置文件（sqlMapConfig.xml）路径
  mapper-locations: classpath:mapper/*Mapper.xml # 指定mapper映射文件路径
  type-aliases-package:  com.haifei.springboot7mybatis.domain # 配置别名

package com.haifei.springboot7mybatis;

import com.haifei.springboot7mybatis.domain.User;
import com.haifei.springboot7mybatis.mapper.UserMapper;
import com.haifei.springboot7mybatis.mapper.UserXmlMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

@SpringBootTest
class Springboot7MybatisApplicationTests {

    @Autowired
    private UserMapper userMapper; //userMapper编译异常解决：在UserMapper类上加@Repository注解，下同

    @Autowired
    private UserXmlMapper userXmlMapper;

    @Test
    void findAllTest() {
        List<User> userList = userMapper.findAll();
        System.out.println(userList);
    }

    @Test
    void findAllTest2() {
        List<User> userList = userMapper.findAll();
        System.out.println("userXmlMapper:" + userList);
    }

}