Cursor to update hierarchy column in every row in several times

Hierarchy value must be returns to multiple rows Hierarchy holds the value of id for exam I'd=1 the value of 1 holding parent_id .3.it checks until the id be null .Can any one help me to write a cursors logic in stored procedures in my sql

I'd   parent_id     hierarchy
1        3.                                
3.        2
2.        1

If we pass 1 as input then output is .3.2.1.3 This value is stored in hierarchy

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