spring boot 驼峰遇到的一个奇怪问题

实体类

public class UserInfoVo {

    @Schema(description = "登录帐号")
    private String uAccount;

    @Schema(description = "用户姓名")
    private String uName;

    @Schema(description = "手机号")
    private String uTel;

    @Schema(description = "电子邮箱")
    private String uEmail;

    @Schema(description = "头像")
    private String uAvatar;

    @Schema(description = "附加说明")
    private String uSubject;
}

mapper

@Select(" select u_account,u_name,u_tel,u_email,u_avatar,u_subject " +
        " from sys_users " +
        " where aid=#{uId} " +
        " limit 1 ")
public UserInfoVo getInfoById(int uId);

返回前端，全部小写，并没有驼峰，甚至在 mapper 里面写 select u_account as uAccount 一样是小写

试了一下别名，发现问题解决了！

public class UserInfoVo {

    @Schema(description = "登录帐号")
    private String urAccount;

    @Schema(description = "用户姓名")
    private String urName;

    @Schema(description = "手机号")
    private String urTel;

    @Schema(description = "电子邮箱")
    private String urEmail;

    @Schema(description = "头像")
    private String urAvatar;

    @Schema(description = "附加说明")
    private String urSubject;
}

@Select(" select u_account as ur_account,u_name as ur_name,u_tel as ur_tel,u_email as ur_email,u_avatar as ur_avatar,u_subject as ur_subject " +
        " from sys_users " +
        " where aid=#{uId} " +
        " limit 1 ")
public UserInfoVo getInfoById(int uId);

 找不到问题，java 新手不知道原因何在，记录一下吧：数据库字段名下划线前只有一个字符的时候不会自动转驼峰，只会转成全部小写格式，如 u_account 转成 uaccount，可以使用别名 ur_account 可得到 urAccount