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Posted by / 01-Jun-2019 08:01

A number of update operations can be performed by a single Update XML action.The XPath query to the XML nodes that will be altered. The XQuery Update Facility provides expressions that can be used to make persistent changes to instances of the XQuery 1.0 and XPath 2.0 Data Model.Thus, besides querying XML documents, you can modify them using the various insert/delete/modify/create methods available in the XQuery Update 1.0 standard.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.We can identify the correct employee by their ID attribute, using the @ID' argument: The Projects node has been inserted into the Employee node having ID #2.

A couple of operations involving the modify() method will not work as may be expected: Issue # 1 The modify() method cannot be used to select the results of the XQuery modify statement.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.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.

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