Table Proxy Extension

The Table Proxy Extension contains the information used to help look up the value in the resolved ORD table. For example, the device contains the Table ORD that's resolved into a table. The 'Column Name' refers to the name of the column while the other row Properties are used to help look up which row the value is referring too.

Properties

Column Name: The name of the column in the table that contains the value.
Row Column Name: In order to look up the value in a table, we need to find it by referring to a column and a row. This Property refers to the name of the column used to look up the value via the Row Index Property. If this is left blank, the query will simply get the last value in the row of the specified column. A more detailed explanation is given below.
Row Index: This value is looked up in the column referred to via the 'Row Column Name'. A more detailed explanation is given below.

Examples of use

Take the follow table of information...

Index Status Value

1 ok 1.2

2 ok 1.6

3 fault 2.4

4 ok 3.3

5 ok 4.1

Index	Status	Value
1	ok	1.2
2	ok	1.6
3	fault	2.4
4	ok	3.3
5	ok	4.1

The first use case will be a Numeric Point we want to update with the latest value from the table. In this case, Column Name will be set to 'Value' and the 'Row Column Name' and 'Row Index' Properties shall be left blank. When run, the Numeric Point will be updated with the value of '4.1'. If another row is added to the table, this point will update with its value.

The second use case will be a Numeric Point we want to update with the value on the third row. It's always the third row so we need to hard code that into the proxy extension. For example, in this case we want to always update the point with the value of '2.4'. In this case we assign the 'Column Name' Property to 'Value', the 'Row Column Name' to 'Index' and 'Row Index' to '3'. This gives the position of the value in a table. This is particularly useful if you're using the table driver to refer to values in a specially constructed SQL view.