Updating xml clob in oracle
If you’re looking for insight or guidance on XML, XML in the database, or XMLDB – then please keep looking. What I am here to talk about is some of the support that SQL Developer offers for XML in the database. If you do a lot of ad hoc table creates like me, then you will appreciate the simplified wizard.You may have heard me say ‘I do not like XML.’ What I mean by that is ‘I do not like poor design decisions, and XML seems to be frequently misued.’ Just to be clear, I don’t mean to malign the technology here! Ninety-five percent of the time, you just want to store numbers, dates, and text.In Listing 1, the row-generating expression is the XPath /Employees/Employee.The passing clause defines that the refers to the XML column data of the table Employees emp.And then use Output: Along with text() expression, Oracle provides various other useful expressions. In below query we select attribute type from the employee node.For example item(), node(), attribute(), element(), document-node(), namespace(), text(), xs:integer, xs:string. Sometimes you may want to fetch the text value of currently selected node item.
Output: In above example we read the content of node firstname / lastname.
Heres a list of useful paths and expression that can be used to select any node/nodelist from a xml document.
There are other useful expressions that you can use to query the data.
Now we can use Oracle XMLTable function to retrieve different information from this XML. Before we start with Oracle XMLTable function it is good to know a bit about XPath.
XPath uses a path expression to select nodes or list of node from a xml document.