Import the last row written in a database

Question

Hello!
I want know what i have to do to import the last row written in a table from a MySQL database.
I'm using labview database toolkit.
Thank you in advanced.
Larson

Answer 1

Hi Larson
I total agree that my first suggestion isn't what you want but I wanted to put the idea across that you can retrieve records from table in the order they were written using a simple SQL command.
When dealing with databases I always design my queries using Design View in MS Access. Once you have the query designed you can then convert the query you have just designed in Design View to SQL by changing to SQL View.
So this example SQL statement would return the MAX Timestamp.
SELECT Max(tblTimeStampTest.Timestamp) AS MaxOfTimestamp
FROM tblTimeStampTest;
Say the timestamp was 12/14/2005 8:18:33
SELECT tblTimeStampTest.*
FROM tblTimeStampTest
WHERE (((tblTimeStampTest.Timestamp)=#12/14/2005 8:18:33#));
This will return your last record as long at the timestamps are unique and records are written in timestamp order. You can then use Build Text Express VI or Format into String to build your SQL strings that have variables like the timestamp above.
I have no experience with mySQL but I would assume MS Access could interface to it somehow either through ODBC or MS Access Projects so that can build you SQL commands.
David