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SQL SERVER: How to Replace XML Node's Attribute Value in XML Column of Table

Introduction:  In this article i am going to explain how to update the value of XML node's attribute in XML data type column in all or specific row of sql server table.


Implementation: Let create a table variable for demonstration purpose.

DECLARE @Employee TABLE(Id INT IDENTITY(1,1),empXML XML); 

Let's insert some dummy data into this table

INSERT INTO @Employee VALUES
(
            '<ROOT>
            <Employee Id="100"/>
            <Employee Id="101"/>
            <Employee Id="102"/>      
            </ROOT>'
)
INSERT INTO @Employee VALUES
(
            '<ROOT>
            <Employee Id="100"/>
            <Employee Id="106"/>
            <Employee Id="107"/>      
            </ROOT>'
)
INSERT INTO @Employee VALUES
(
            '<ROOT>
            <Employee Id="100"/>
            <Employee Id="102"/>
            <Employee Id="109"/>      
            </ROOT>'
)
INSERT INTO @Employee VALUES
(
            '<ROOT>
            <Employee Id="111"/>
            <Employee Id="107"/>
            <Employee Id="101"/>      
            </ROOT>'
)

Show table data
SELECT * FROM @Employee

Replace XML node's attribute value in XML Column of sql server table


Now suppose we want to update the value of Xml node's attribute value from 101 to 777 in all rows where exists.

So let's declare two variables. @OldEmployeeId is the Id that we want to replace and @NewEmployeeId is the Id that we want to replace with.

DECLARE @OldEmployeeId INT=101, @NewEmployeeId INT=777;

The query will be as:

UPDATE @Employee
SET empXML.modify('replace value of (ROOT/Employee[@Id eq sql:variable("@OldEmployeeId")]/@Id)[1] with sql:variable("@NewEmployeeId")')
WHERE empXML.exist('ROOT/Employee[@Id eq sql:variable("@OldEmployeeId")]') = 1;

Show updated table data

SELECT * FROM @Employee

Result will be as:

Id
empXML
1
<ROOT><Employee Id="100" /><Employee Id="777" /><Employee Id="102" /></ROOT>
2
<ROOT><Employee Id="100" /><Employee Id="106" /><Employee Id="107" /></ROOT>
3
<ROOT><Employee Id="100" /><Employee Id="102" /><Employee Id="109" /></ROOT>
4
<ROOT><Employee Id="111" /><Employee Id="107" /><Employee Id="777" /></ROOT>

Now suppose we want to update the value of Xml node's attribute value from 101 to 777 in specific row i.e. where the value of column Id=4

The query will be as:

UPDATE @Employee
SET empXML.modify('replace value of (ROOT/Employee[@Id eq sql:variable("@OldEmployeeId")]/@Id)[1] with sql:variable("@NewEmployeeId")')
WHERE empXML.exist('ROOT/Employee[@Id eq sql:variable("@OldEmployeeId")]') = 1 AND Id=4;

Show updated table data

SELECT * FROM @Employee

Result will be as:
Id
empXML
4
<ROOT><Employee Id="111" /><Employee Id="107" /><Employee Id="777" /></ROOT>

Now over to you:
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