Mybatis-Plus 配置选项 mapunderscoretocamelcase

Mybaits-plus 默认开启 mapunderscoretocamelcase 驼峰命名规则映射，它会将 SQL 查询结果中以下划线命名的数据库字段（比如 A_COLUMN）映射为以驼峰命名的 Java 类字段（比如 aColumn）。

[!WARNING]
如果此时将 Java 类字段定义为小写下划线规则，比如 a_column，那么这个Java 类字段就接受不到 Mybatis 查询的结果。比如：

@Data
public SomeResponse {
    private String n_alms;
    private String c_alms;
    private String b_alms;
}

<select id="getAlarmCountToday" resultType="com.example.demo.device.model.SomeResponse">
    SELECT
        SUM(IF(DATE(alarm_time) = CURRENT_DATE AND alarm_type = 'c_alms', 1, 0)) AS c_alms,
        SUM(IF(DATE(alarm_time) = CURRENT_DATE AND alarm_type = 'b_alms', 1, 0)) AS b_alms,
        SUM(IF(DATE(alarm_time) = CURRENT_DATE AND alarm_type = 'n_alms', 1, 0)) AS n_alms
    FROM device_alarm_record
    WHERE tenant_id = #{tenantId}
</select>

mapunderscoretocamelcase