Error using database toolkit

Question

Hello,
I'm using a DB Tools open Conection.......to get data from a SQL database....when I run the VI's it appears the following error:
Error -2147467259 occurred at DB Tools Open Connec (String).vi->connect_sql(1).vi
Possible reason(s):
Exception occured in Microsoft OLE DB Provider for ODBC Drivers, [MySQL][ODBC 3.51 Driver]Too many connections.  in DB Tools Open Connec (String).vi->connect_sql(1).vi
I don't know why it happens.....i've attached the sub vi's. It can be the drivers I'm using for this database?
Thanks
Attachments:
connect_sql(1).vi ‏26 KB

Answer 1

The error is described as too many connections, so this probably happens because you open a connection and then try to open another without closing the first (or whatever number of connections you can have open simultaneously). Move the open connection out of the loop, place a close connection after the loop and make sure you have a proper way to stop the loop. If you only want to run this once, you don't need the loop. This is also true if you want to run it as a subVI.
These things apply to any reference based action in LV (TCP, File I/O, queues and so on) - You need to open a resource once, use the reference you get in all the functions you need and then close the resource.
To learn more about LabVIEW, I suggest you try searching this site and google for LabVIEW tutorials. Here and here are a couple you can start with. You can also contact your local NI office and join one of their courses.
In addition, I suggest you read the LabVIEW style guide and the LabVIEW user manual (Help>>Search the LabVIEW Bookshelf).
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