Question

下午好。我尝试通过一个请求执行这种情况：我有一个表，每小时输入一个值。如果最后一次下注的日期超过1小时，我想插入一个新条目，如果在一小时内，则增加该值

示例：

+------------+-------------------+
| value      | date              |
+------------+-------------------+
|     100    |2020-08-06 12:12:12|
+------------+-------------------+
|     100    |2020-08-06 **11:11:00**|
+---------------------------------

新通知

+------------+-------------------+
|     50     |2020-08-06 **11:20:00**|
+------------+-------------------+

=>

+------------+-------------------+
| value      | date              |
+------------+-------------------+
|     100    |2020-08-06 12:12:12|
+------------+-------------------+
|     150    |2020-08-06 **11:11:00**|
+---------------------------------

需要：

IF EXISTS (SELECT * FROM energy_consumption WHERE date BETWEEN strftime('%Y-%m-%d %H:00:00', 'now') AND DATETIME('now'))
    UPDATE energy_consumption SET consumption_tarif_1 = consumption_tarif_1 + 100 WHERE date BETWEEN strftime('%Y-%m-%d %H:00:00', 'now') AND DATETIME('now')
ELSE
    INSERT INTO energy_consumption (counter_type_id, consumption_tarif_1, consumption_tarif_2, consumption_tarif_3) VALUES(1, 100, 100, 100)

但是IF - ELSE-在SQLite 3.x上不支持

我正在尝试做一个电表

Answer 1

使用2条语句：

UPDATE energy_consumption 
SET consumption_tarif_1 = consumption_tarif_1 + 100 
WHERE date BETWEEN strftime('%Y-%m-%d %H:00:00', 'now') AND DATETIME('now')
AND EXISTS (
  SELECT * FROM energy_consumption 
  WHERE date BETWEEN strftime('%Y-%m-%d %H:00:00', 'now') AND DATETIME('now')
);

INSERT INTO energy_consumption (counter_type_id, consumption_tarif_1, consumption_tarif_2, consumption_tarif_3) 
SELECT 1, 100, 100, 100
WHERE NOT EXISTS (
  SELECT * FROM energy_consumption 
  WHERE date BETWEEN strftime('%Y-%m-%d %H:00:00', 'now') AND DATETIME('now')
);

由于它们都包含与EXISTS和NOT EXISTS互斥的条件，因此将仅执行其中的1个。

SQLite3：如果存在IF行，则将递增值ELSE插入新行

1 个答案: