Sql Server: Update multiple XML node values with new values in table

Introduction:  In this article I am going to share how to modify or we can say replace multiple XML node/ attribute values with new values in single or multiple update statement(s) based on condition in sql server table. 

In Previous articles i explained Parse xml and get data as comma separated string format and Convert xml data to sql database table and Delete records from table using inner join in sql server and Get age in years, months and days from date of birth and Query to find all foreign keys references of particular table

Implementation: Let’s create an employee table using table variable for demonstration purpose and insert some dummy xml data in xml type column of table.

DECLARE @Employee TABLE(empXML XML)

INSERT INTO @Employee VALUES('<ROOT><Employee Id="101" Name="Hrithik" City="Noida" Age="32" /></ROOT>')

INSERT INTO @Employee VALUES('<ROOT><Employee Id="102" Name="Ranbeer" City="Delhi" Age="25" /></ROOT>')

INSERT INTO @Employee VALUES('<ROOT><Employee Id="103" Name="Akshay" City="Mumbai" Age="56" /></ROOT>')

INSERT INTO @Employee VALUES('<ROOT><Employee Id="104" Name="Sidharth" City="Kolkata" Age="33" /></ROOT>')

INSERT INTO @Employee VALUES('<ROOT><Employee Id="105" Name="Randeep" City="Chennai" Age="29" /></ROOT>')

INSERT INTO @Employee VALUES('<ROOT><Employee Id="106" Name="Varun" City="Bengaluru" Age="30" /></ROOT>')

Check table data

SELECT * FROM @Employee

Suppose we want to update value of Employee Id to "111", Name to "Aamir", City to "Chandigarh" and Age to "40" where Employee Id is 104

Then there are two options as following:

First is to update each node based on condition as

UPDATE @Employee SET

empXML.modify('replace value of (ROOT/Employee/@Name)[1] with "Aamir"')

WHERE empXML.value('(ROOT/Employee/@Id)[1]', 'INT') = 104

UPDATE @Employee SET

empXML.modify('replace value of (ROOT/Employee/@City)[1] with "Chandigarh"')

WHERE empXML.value('(ROOT/Employee/@Id)[1]', 'INT') = 104

UPDATE @Employee SET

empXML.modify('replace value of (ROOT/Employee/@Age)[1] with "40"')

WHERE empXML.value('(ROOT/Employee/@Id)[1]', 'INT') = 104

UPDATE @Employee SET

empXML.modify('replace value of (ROOT/Employee/@Id)[1] with "111"')

WHERE empXML.value('(ROOT/Employee/@Id)[1]', 'INT') = 104

Second and Best way:

DECLARE @xmlData xml;

SELECT @xmlData = empXML FROM @Employee;

SET @xmlData.modify('replace value of (ROOT/Employee/@Id)[1] with "111"')

SET @xmlData.modify('replace value of (ROOT/Employee/@Name)[1] with "Aamir"')

SET @xmlData.modify('replace value of (ROOT/Employee/@City)[1] with "Chandigarh"')

SET @xmlData.modify('replace value of (ROOT/Employee/@Age)[1] with "40"')

-- This way we only need to do one update on the table instead of multiple updates corresponding to each node/attribute we wish to update.

UPDATE @Employee

SET empXML = @xmlData WHERE  empXML.value('(ROOT/Employee/@Id)[1]', 'INT') = 104

Check updated table data now

SELECT * FROM @Employee

 Now over to you:

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