Updating xml

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Otherwise, sample XML data will need to be provided in order to select the node using the XML browser.

What is the most efficient way to modify XML values?

To allow for precise modification of XML nodes and values, the XQuery XML query language employs an extension known as the XML Data Modification Language (DML).

The XML DML uses the XML modify() method, which makes use of three operational keyword sets: insert, replace value of, and delete. The insert keyword uses the following structure: The Accounting node was added inside the Salaries node by simply using the insert..format.

The following will fail: This is because modify() operates directly on the XML value, whether it is a column or variable, and cannot be used in an ad-hoc operation that does not update the underlying XML value.

An alternative to the above operation would be to select the XML value into a new XML variable, make the change, and then select the variable value: , on the same XML value.

Even though there is only one Salaries node, the singleton is still required.

Attempting to run the query without the singleton will result in an error: We see that the node was placed after the only other existing node residing on the same level (the Marketing node) by default.

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We incorporated the SQL variable '@i' (inside of a sql:variable() extension function), which was used to iterate the Employee nodes.If we want to designate a new project for employee ID #2, we can do the following: The newest employee now needs salary data.Employee #4 is at tier 4, like employee #1, and should be at the same salary range as employee #1.You may notice that we designated a singleton (single node value) representation of [1]' for Expression 2 (the Salaries destination node).This is because the insert keyword requires that Expression 2 be a single node.

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