Update a single tag with most recent values from database
- Last UpdatedNov 18, 2022
- 1 minute read
- PI System
- Interfaces
This query retrieves all values written to the RDBMS after the last time that values
were read.
SELECT timestamp, value, 0
FROM table2
WHERE timestamp > ? ORDER BY timestamp ASC;
Configure the target PI point with the following settings:
|
Point Attribute |
Description |
Setting |
|---|---|---|
|
ExDesc |
Placeholders and options |
P1=TS |
|
Location2 |
First row/all rows |
1 (Processes all rows) |
|
Location3 |
Data distribution strategy |
0 (Single) |
|
Location4 |
Scan class |
1 |
|
Location5 |
Exception reporting |
0 (Exception reporting is enabled) |
|
InstrumentTag |
Name of the query file |
Example2.SQL |
|
PointType |
Data type of PI point |
Float32 |
In the RDBMS, create a table formatted as follows.
|
Column name |
Column data type |
|
|---|---|---|
|
SQL Server data type |
Microsoft Access data type |
|
|
timestamp |
DateTime |
Date/Time |
|
value |
Real |
Number-Single Precision |