Ms sql update xml node

Here, a full XML document is supplanted by a new one. This generally occurs when a complete XML document is changed by a customer application. Msg , Level 16, State 1, Line 14 Argument data type xml is invalid for argument 1 of replace function. When the client needs to replace a specific XML element or attribute value, XQuery is a good solution for targeting the particular element or attribute.

In the traditional model, we retrieve the XML, update the details and replace it. XML path can be conditional because the path can exist with multiple parent tags. So, the condition can bifurcate to be inserted within the proper address in the XQuery. Privacy policy. Expression1 Identifies a node whose value is to be updated. It must identify only a single node.

That is, Expression1 must be a static singleton. If the XML is typed, the type of the node must be a simple type. When multiple nodes are selected, an error is raised. If Expression1 returns an empty sequence, no value replacement occurs and no errors are returned. Expression1 must return a single element that has simple type content list or atomic types , a text node, or an attribute node.

It allows you to identify nodes that will be mapped into a new row. Every xml data type instance has an implicitly provided context node. For the XML instance stored in a column or variable, this node is the document node. The document node is the implicit node at the top of every xml data type instance. The result of the nodes method is a rowset that contains logical copies of the original XML instances.

In these logical copies, the context node of every row instance is set to one of the nodes that is identified with the query expression. This way, later queries can navigate relative to these context nodes.

You can retrieve multiple values from the rowset. For example, you can apply the value method to the rowset returned by nodes and retrieve multiple values from the original XML instance. The value method, when applied to the XML instance, returns only one value. XQuery Is a string literal, an XQuery expression. If the query expression constructs nodes, these constructed nodes are exposed in the resulting rowset. Only employee 2 is working on this project, so we can run the following to remove the value:.

We can use replace value of to change node values. The syntax format for replace value of is as follows:. We realize that the salary amount for employee 2 is incorrect. We need to change it from to To update it to the new value, we'll run the following:. We can use a script that iterates Employee nodes appropriately:. We incorporated the SQL variable ' i' inside of a sql:variable extension function , which was used to iterate the Employee nodes.

Notice that the salary amount for employee 4 was not updated, since that employee is in the Accounting department. The modify method cannot be used to select the results of the XQuery modify statement.

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:. The above method can be used to check or test the modification script before actually applying it to the original XML value.

In other words, only one instance of modify may be used at the same time on the XML value. Employee 1 has reached tier 1 status. We need to update the salary amount to match that of employee 2 :. We also need to change the tier number for employee 1.

We've successfully changed the salary amount and tier number for employee 1. The results after running both statements are as follows:. Notice that we had to perform two separate modify operations in order to update the salary and tier data.

We introduced all three operational keyword sets: insert, replace value of , and delete ; and used them to perform some of the more common XML modification operations. We also pointed out some limitations and appropriate workarounds.

There seems to be something wrong with your email because I got a delivery error when trying to send over the info. I would need a little more info - if you want to send me a piece of the xml and your select statement I will look at it.

That didn't work for me, but I was able to get what I needed, I just need to find a way to put them together. I was able to get the XML the way I needed by using.