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--- en:mervis-db:data-identification [2017/07/21 18:03]
m.chlupac
+++ en:mervis-db:data-identification [2017/07/24 13:32]
@@ Line 1: / Line 1: @@
-====== Data Identification ======
-Every variable stored in Mervis DB is identified by set of keys and values. Combination of of keys and values marked with attribute "IsKey=true" defines unique identification of variable (equivalent to **primary key** known from SQL world).
-===== Keys =====
-Any string that consists of characters: a-z, A-Z, 0-9, ., _, - can be used as a key. The key must not start with underscore ("_") character and must not be empty.
-===== Values =====
-Any string that consists of characters: a-z, A-Z, 0-9, ., _, - can be used as a value.
-==== Example of Variable Keys and Values ====
-^Key^Value^IsKey^Description^
-| SoftPlcRtId | "MyRTNumber3025" | **True** |Unique identification of Mervis RT defined by user |
-| GUID| 546 | **True** |Unique identification of Mervis RT variable generated by Mervis IDE |
-| VariableName | "Outside Temperature" | False |Non-unique variable name defined by user in Mervis IDE |