Using menu ring to select data out of database with SQL

I have a database setup with two tables and six columns of data. One of the columns contains an array of data. I would like to be able to read the data out with two ring controls. One ring to select the table and the other to select certain rows of data based on the value in one row. I want the data charts to update automatically inside a loop when the ring values are changed. I started by modifying the playback(fetching) example. The problem is when I change the menu item, I am not closing the first connection before opening a new one. Should I be using the running stored procedures with parameters method to accomplish this task?? I suppose all of the data could be read and then sorted out of the result.
Attachments:
myPlayback_rev2.vi ‏120 KB

unclebump,
There are two possible solutions. If you are using LabVIEW 6.0.x, then you will need to put a while loop around all of your program and poll to see if the values of the ring controls have changed (can be done with a shift register). If nothing has changed, then have a case structure that does nothing. If the values have changed, then get the new data.
If you are using LabVIEW 6.1, then you can check for a value changed event on the ring controls. Everything else from the 6.0.x version from above would be the same. This eliminates the polling which reduces processor use.
Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask

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