| Unit: | SDL_datatable |
| Class: |
TDataTable |
| Declaration: |
function CRCofNamesAndAttributes: string; |
The function CRCofNamesAndAttributes calculates a 256-bit CRC code over the following information of the data table:
- the comment
- the row and column headings
- the row and column attributes
- the scale type of each variable (column)
- the nominal identifiers of each variable
The CRC code is returned as a hexadecimal string of 64 characters.
| Hint 1: |
Please note that the CRC code cannot be unique but there is only an extremely small chance to get a hash code collision. Thus the CRC code can be used to check whether two matrices are different (if the CRCs differ the matrices must be different), however there is a very small chance that the CRCs of two different matrices are equal.
|
| Hint 2: |
In order to detect the change of any aspect of the data table you have to use the following three functions: CRCofCellStates, CRCofNamesAndAttributes, and NumericData.CRCofData |
|
MathPack 
