User`s guide

232 VEE User’s Guide
5 Storing and Retrieving Test Results Chapter
Using DataSets to Store and Retrieve Records
DataSets can retrieve one or more records. VEE objects unpack
the records. Therefore, by storing records to DataSets instead of
files, you do not have to remember the data types. You can also
perform sort and search operations on the data, creating your
own customized test database.
Lab 5-5: Using DataSets
A DataSet is simply an array of Records stored in a file. This
exercise shows how to get data into and out of a DataSet.
Storing and Retrieving a Record from a DataSet
This exercise creates an array of ten Records, each containing
three fields with a test name, a Real64 Scalar, and an array of
Reals. It stores the array of Records in a DataSet, and retrieves
the records and displays them.
1 Select Flow ⇒ Start. Select Flow ⇒ Repeat ⇒ For Count and
place the object under Start. Select Device
⇒ Formula and
place the object to the right of For Count. Connect Start to
the sequence input pin on For Count; connect the For Count
data output pin to Formula data input pin.
2 Double- click the Formula expression field to highlight the
default expression, and then type “test“ + a.
When you click Start, the For Count object outputs integers
zero through nine sequentially to the A pin of Formula. In the
Formula object, the integers are added to the word “test”
and output as Text Scalars: test0, test1, test2,...,test9. These
values will fill the first fields in the ten Records.
3 Select Data ⇒ Build Data ⇒ Record, and place the object to
the right of Formula. Add a data input pin. Connect the data
output of Formula to the A input of Build Record.