Question

我有两个表，一个是sensor_pool，它是更改temp_cel值和计时器间隔

sensor_pool

| address | temp_cels |
|---------------------|
| sensor1 | 83C       |
| sensor2 | 82C       |
| sensor3 | 85C       |
| sensor4 | 85C       |
| sensor5 | 84C       |

和另一个表sensor_history，我有动态创建的列（添加了传感器地址为列名的列）。我能够捕获日期时间而不是其他表中的temp_cels。

INSERT INTO sensor_history(datetime) VALUES(" & dtfStr & ")

dtfStr = timestamp

传感器历史记录

|    datetime    | sensor1 | sensor2 | sensor3 | sensor4 | sensor5 | 
|------------------------------------------------------------------|
| 12022013080513 |  NULL   |  NULL   |  NULL   |  NULL   |  NULL   |

到目前为止，我的查询位于for循环内（用于获取列）

IF EXISTS(SELECT datetime FROM sensor_history where datetime='" & dtfStr & "') 
MERGE sensor_history sh USING sensor_pool sp ON [(SELECT '" & dgvSensors.Rows(l).Cells(0).Value & "' 
FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='sensor_history' AND COLUMN_NAME='" & dgvSensors.Rows(l).Cells(0).Value & "')] = sp.sens_code 
WHEN MATCHED THEN UPDATE SET sh.[" & dgvSensors.Rows(l).Cells(0).Value & "] = st.temp_cels 
WHEN NOT MATCHED BY TARGET THEN INSERT ([" & dgvSensors.Rows(l).Cells(0).Value & "]) VALUES (st.temp_cels);"

dgvSensors datagridview与sensor_pool表相同。 vb.net + SQL Server

这是我的目标结果：

|    datetime    | sensor1 | sensor2 | sensor3 | sensor4 | sensor5 | 
|------------------------------------------------------------------|
| 12022013080513 |   83C   |   82C   |   85C   |   85C   |   84C   |

希望有人可以帮助我

谢谢

Answer 1

INSERT INTO sensor_history(datetime,sensor1,sensor2,sensor3,sensor4,sensor5) 
VALUES(getdate(),
select temp_cels from sensor_pool where address='sensor1',
select temp_cels from sensor_pool where address='sensor2',
select temp_cels from sensor_pool where address='sensor3',
select temp_cels from sensor_pool where address='sensor4',
select temp_cels from sensor_pool where address='sensor5')

SQL Server更新来自另一个表行的所有列

1 个答案: