SQL Server XML file update the value of one node where text of other node is XXX

Here is the XML I have in my Table Field

<CtcConfiguration xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <Ctc>3</Ctc>
    <SalaryComponent>
        <SalaryComponentConfiguration>
            <Name>Basic</Name>
            <DisplayOrder>0</DisplayOrder>
            <Value>5634655</Value>
        </SalaryComponentConfiguration>
        <SalaryComponentConfiguration>
            <Name>HR</Name>
            <DisplayOrder>0</DisplayOrder>
            <Value>1234</Value>
        </SalaryComponentConfiguration>
        <SalaryComponentConfiguration>
            <Name>medical</Name>
            <DisplayOrder>0</DisplayOrder>
            <Value>0</Value>
        </SalaryComponentConfiguration>
    </SalaryComponent>
</CtcConfiguration>

I want the update the value of node(DisplayOrder) by depending on the node(Name). For example if I give name as medical it should update the displayorder value as required.

This is what I tried so far:

UPDATE payroll.pays set 
    CtcConfiguration.modify('replace value of (/CtcConfiguration/SalaryComponent/SalaryComponentConfiguration/DisplayOrder/text())[1] with ("99999")') 
where 
    CtcConfiguration.value('((/CtcConfiguration/SalaryComponent/SalaryComponentConfiguration/Name)[]/text())[1]','varchar(50)') = 'HR'

Solution

Try it like this:

hint: This example manipulates the <Value> but it works in the same way for <DisplayOrder> too.

DECLARE @mockupTable TABLE(ID INT IDENTITY, YourXML XML);
INSERT INTO @mockupTable VALUES
(N'<CtcConfiguration xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <Ctc>3</Ctc>
    <SalaryComponent>
        <SalaryComponentConfiguration>
            <Name>Basic</Name>
            <DisplayOrder>0</DisplayOrder>
            <Value>5634655</Value>
        </SalaryComponentConfiguration>
        <SalaryComponentConfiguration>
            <Name>HR</Name>
            <DisplayOrder>0</DisplayOrder>
            <Value>1234</Value>
        </SalaryComponentConfiguration>
        <SalaryComponentConfiguration>
            <Name>medical</Name>
            <DisplayOrder>0</DisplayOrder>
            <Value>0</Value>
        </SalaryComponentConfiguration>
    </SalaryComponent>
</CtcConfiguration>');


DECLARE @AttributeName VARCHAR(100)=N'medical';
DECLARE @NewValue INT=12345;

UPDATE @mockupTable
SET YourXML.modify(N'replace value of (/CtcConfiguration
                                       /SalaryComponent
                                       /SalaryComponentConfiguration[(Name/text())[1]=sql:variable("@AttributeName")]
                                       /Value/text())[1] 
                     with sql:variable("@NewValue")');


SELECT * FROM @mockupTable;

Short explanation

your XML is a rather simple Attribute-Value model (with a visible rank). You use an XQuery predicate to filter the correct attribute and set this special <Value>. So you have to look for the <SalaryComponentConfiguration> where the <Name> has got a special content.