1、建表语句

create table user(
id int PRIMARY KEY auto_increment,
name varchar(400)
);

2、Maven 依赖

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>constxiong</groupId>
        <artifactId>demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <artifactId>mybatis-autoincrement</artifactId>

    <dependencies>
        <!-- MySQL 8.0.21 驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.21</version>
        </dependency>

        <!-- MyBatis -->
        <dependency>
		  <groupId>org.mybatis</groupId>
		  <artifactId>mybatis</artifactId>
		  <version>3.5.5</version>
		</dependency>

    </dependencies>

    <build>

    </build>
</project>

3、mybatis-config.xml 配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"></setting>
    </settings>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://172.31.32.184:3306/constxiong?serverTimezone=UTC&amp;useSSL=false&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="constxiong@123"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="constxiong/mapper/UserMapper.xml"/>
    </mappers>
</configuration>

4、Mapper 接口

package constxiong.mapper;

import constxiong.po.User;

/**
 * UserMapper 接口，映射对数据库的操作
 */
public interface UserMapper {

    int insertUser(User user);

}

5、Mapper xml

<?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="constxiong.mapper.UserMapper">

    <insert id="insertUser" parameterType="constxiong.po.User" useGeneratedKeys="true" keyProperty="id">
        insert into user(name) values(#{name})
    </insert>

</mapper>

6、User po 模型

package constxiong.po;

/**
 * 用户表模型
 */
public class User {
    private Integer id;

    private String name;

    private String mc;

    public User(Integer id, String name) {
        this.id = id;
        this.name = name;
    }

    public Integer getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getMc() {
        return mc;
    }

    public void setMc(String mc) {
        this.mc = mc;
    }

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

7、测试类