重点：application.propertis配置类

#TypeEnumHandler 这个类的包名，不是全路径
mybatis.type-handlers-package=com.fan.test.handler

两个枚举类：

public enum StatusEnum {
    DELETED(0),
    ACTIVE(1);

    private final int code;

    StatusEnum(int code) {
        this.code = code;
    }

    public int getCode() {
        return code;
    }
}

public enum TypeEnum {

    ONE(1, "one"),
    TWO(2, "two"),
    THREE(3, "three");

    private int code;
    private String desc;

    TypeEnum(int code, String desc) {
        this.code = code;
        this.desc = desc;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getDesc() {
        return desc;
    }

    public static TypeEnum fromCode(int code) {
        for (TypeEnum type : values()) {
            if (type.code == code) {
                return type;
            }
        }
        throw new IllegalArgumentException("Invalid TypeEnum code: " + code);
    }
}

实体类：

@Data
public class User {
    private Long id;
    private TypeEnum type;
    private String username;
    private String password;
}

handler 转换类【TypeEnumHandler】

@MappedTypes(TypeEnum.class)
@MappedJdbcTypes(JdbcType.INTEGER)
public class TypeEnumHandler implements TypeHandler<TypeEnum> {

    @Override
    public void setParameter(PreparedStatement ps, int i, TypeEnum parameter, JdbcType jdbcType) throws SQLException {
        System.out.println("TypeHandler called with value: " + parameter);
        ps.setInt(i, parameter.getCode());
    }

    @Override
    public TypeEnum getResult(ResultSet rs, String columnName) throws SQLException {
        return TypeEnum.fromCode(rs.getInt(columnName));
    }

    @Override
    public TypeEnum getResult(ResultSet rs, int columnIndex) throws SQLException {
        return TypeEnum.fromCode(rs.getInt(columnIndex));
    }

    @Override
    public TypeEnum getResult(CallableStatement cs, int columnIndex) throws SQLException {
        return TypeEnum.fromCode(cs.getInt(columnIndex));
    }
}

mapper接口

@Mapper
public interface UserMapper {

    List<User> selectAll();

    void insertUser(User user);
}

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="UserMapper">

    <!--查询（自动映射）-->
    <select id="selectAll" resultType="com.fan.test.entity.User">
        <bind name="ACTIVE" value="@com.fan.test.enums.StatusEnum@ACTIVE.code"/>
        SELECT * FROM user WHERE status = #{ACTIVE}
    </select>


    <!--插入（自动传入枚举的 code）-->
    <insert id="insertUser" parameterType="com.fan.test.entity.User">
        INSERT INTO user (type, username, password)
        VALUES (#{type}, #{username}, #{password})
    </insert>
</mapper>

这里枚举转换还有其他两种写法：
第一种：

 @TypeHandler(TypeEnumHandler.class)
    private TypeEnum type;

第二种：

<insert id="insertUser" parameterType="com.fan.test.entity.User">
    INSERT INTO user (type, username, password)
    VALUES (#{type, typeHandler=com.fan.test.handler.TypeEnumHandler}, #{username}, #{password})
</insert>