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Parse (Database Engine)

Parse converts the canonical string representation of a hierarchyid to a hierarchyid value. Parse is called implicitly when a conversion from a string type to hierarchyid occurs. Acts as the opposite of ToString. Parse() is a static method.


-- Transact-SQL syntax
hierarchyid::Parse (input)
-- This is functionally equivalent to the following syntax 
-- which implicitly calls Parse():
CAST (input AS hierarchyid )

-- CLR syntax
static SqlHierarchyId Parse (SqlString input) 

input

Transact-SQL: The character data type value that is being converted.

CLR: The String value that is being evaluated.

SQL Server return type:hierarchyid

CLR return type:SqlHierarchyId

If Parse receives a value that is not a valid string representation of a hierarchyid, an exception is raised. For example, if char data types contain trailing spaces, an exception is raised.

A. Converting Transact-SQL values without a table

The following code example uses ToString to convert a hierarchyid value to a string, and Parse to convert a string value to a hierarchyid.

DECLARE @StringValue AS nvarchar(4000), @hierarchyidValue AS hierarchyid
SET @StringValue = '/1/1/3/'
SET @hierarchyidValue = 0x5ADE

SELECT hierarchyid::Parse(@StringValue) AS hierarchyidRepresentation,
 @hierarchyidValue.ToString() AS StringRepresentation ;
GO

Here is the result set.

hierarchyidRepresentation StringRepresentation

------------------------- -----------------------

0x5ADE /1/1/3/

B. CLR example

The following code snippet calls the Parse() method:

string input = “/1/2/”;
SqlHierarchyId.Parse(input);

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