Updating array data in sql database

Question

HI,
Im facing problems in updating array data in SQL database.
As of now, i am able to write an "insert" query and insert array data in an image datatype field. Im using image datatype because the array size is very big(around 80,000 x and y values).
Althoug inserting data is easy im unable to write a query to update this data.
Referring to the help of SQL server and Labview database connectivity toolkit, i came across a method of accessing image datatype....using textpointers, which are 16 bit binary values and using the WRITETEXT function instead of the UPDATE function.
but the problem im facing is that ive to pass the array as a 2d string array in the query as a result the updated array is retrieved in the form of a string a
nd not as an array. how do I get over this problem?

Answer 1

Hi Pavitra,
I'm not very clear on how you have inserted the data into your application, but I do know that when you call the UPDATETEXT or WRITETEXT function you use the TEXTPOINTERS to point to the first location of a 1d array. So, depending on how you've stored the data, you may have problems updating your data if you're looking at it as a 1d array instead of how you originally formatted it. If you are able to successfully access the data as a 1d array, you can use the database variant to data type vi and pass in a string array constant for the data type. This will convert the variant datatype into whatever you specify. You may have to index the row and column of the variant (you receive a 2d array of variant) first before you convert. If possible, can yo
u provide some more detail and maybe some example code of how you perform the insert and plan to do the update? I can probably give you a better solution if I know how you are formatting the data. Thanks!
Jeremy L.
National Instruments
Jeremy L.
National Instruments