Sql xml update

So, the modify function will carry out the activity on an inappropriate XML tag which is situated in the same position in the target XML path:. When we execute the above statement without a condition, then the first fname will be updated with a new value on the targeted XML path. But when a user wants to modify a specific element of those, then there must be a condition to filter the element.

The filter can be applied by adding a condition on attribute or element with a specific value, as shown below. Even there can be multiple filters with different tags in the XML. See the example:. This article describes the feature of XQuery and related implicit functions with the data model. Example updates selected nodes within a collection. Example illustrates the common mistake of using an XQuery Update replace-value operation to update a node that occurs multiple times in a collection.

Instead of updating only the intended node, Example updates the values of all text nodes that belong to the Description element. This is not what was intended. A WHERE clause can be used only to identify which documents must be updated, not which nodes within a document must be updated.

After the document has been selected, the XQuery expression passed to XQuery Update determines which nodes within the document must be updated. In this case, the XQuery expression identifies all three Description nodes, so all three of the associated text nodes were updated. To correctly update a node that occurs multiple times within a collection, use the XQuery expression passed XQuery Update to identify which nodes in the XML document to update. By introducing the appropriate predicate into the XQuery expression, you can limit which nodes in the document are updated.

Example illustrates the correct way to update one node within a collection. The type and namespace properties of the element are retained. See Example If you update an attribute value to NULL , the value appears as the empty string. If you update the text node of an element to NULL , the content text of the element is removed. The element itself remains, but it is empty. Example updates all of the following to NULL :. The Description element and the Quantity attribute of the LineItem element whose Part element has attribute Id value Note that Example shows two different but equivalent ways to remove the value of a node.

For element Description and attribute Quantity , a literal XQuery empty sequence, , replaces the existing value directly. But in real-world examples you will often pass a value that is available only at runtime. You can use XQuery Update to insert new children either a single attribute or one or more elements of the same type under parent XML elements. The XML document that is the target of the insertion can be schema-based or non-schema-based.

Example inserts a new LineItem element as a child of element LineItems. Note that it uses the Oracle XQuery pragma ora:child-element-name to specify the name of the inserted child element as LineItem. If the XML data to be updated is XML schema-based and it refers to a namespace, then the data to be inserted must also refer to the same namespace.

Otherwise, an error is raised because the inserted data does not conform to the XML schema. Be aware that using XQuery Update to update XML schema-based data results in an error being raised if you try to store the updated data back into an XML schema-based column or table. Example is the same as Example , except that the LineItem element to be inserted refers to a namespace.

This assumes that the relevant XML schema requires a namespace for this element. Example inserts a LineItem element before the first LineItem element. Example inserts a Date element as the last child of an Action element. Example deletes the LineItem element whose ItemNumber attribute has value Example creates a view of table purchaseorder. A SQL query that involves XQuery expressions can often be automatically rewritten optimized in one or more ways.

This optimization is referred to as XML query rewrite or optimization. XPath expressions are a proper subset of XQuery expressions. The rewritten SQL statement can also make use of any B-tree indexes on the underlying data structures. This can take place for both queries and update operations. As with database queries generally, you determine whether tuning is required by examining the execution plan for a query.

If the plan is not optimal, then consult the following documentation for specific tuning information:. In addition, be aware that the following expressions can be expensive to process, so they might add performance overhead when processing large volumes of data:.

Several competing optimization possibilities can exist for queries with XQuery expressions, depending on various factors such as the XMLType storage model and indexing that are used. By default, Oracle XML DB follows a prioritized set of rules to determine which of the possible optimizations should be used for any given query and context. This behavior is referred to as rule-based XML query rewrite. In this mode, Oracle XML DB estimates the performance of the various XML optimization possibilities for a given query and chooses the combination that is expected to be most performant.

Once way to accomplish what you want to do is to put the update in a loop:. SET Salaries. Hi, These tips are very useful and it has help me in updating the XMLs individual attributes. But I have one query , Is there any way that we can update all the salaries to irrespective of them being in accounting or marketing. Currently am able to do this by preperaing multiple update scripts. But Instead can we have one scripts where I can update all at one shot irrespective of department and employee ID.

I have found the solutioin already and it works just fine. Here is the solution for those who needs it for bulk updates:. I have been banging my head against both inserting and updating xml for many hours.

Your article with the very clear examples solved my problems in about 15 minutes. Prem - please see the 'Replacing Values' section of this article. You'll want to use the 'replace value of' expression inside of the modify function. I want to replace the code which has alpha numeric characters as alpha characters, how can we do it?

Problem arises when we have to update any node value for all Deal lines. As Replace Value Of updates only 1 node at once we have to apply loop for updating all nodes. This takes quite a long time. We tried creating Primary and secondary indexes but that doesn't improve update speed.

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View all my tips. Back To Top Sorry Reem, it should be seth nym. How to update xml using value from a sql query Ask Question. Asked 3 years, 8 months ago. Active 3 years, 8 months ago. Viewed 5k times. Improve this question. Sir Swears-a-lot Sir Swears-a-lot 3, 2 2 gold badges 21 21 silver badges 44 44 bronze badges. Add a comment. Active Oldest Votes.

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