Oracle XMLType Guide: Processing XML Strings

Oracle can use the XMLType data type to handle XML strings. Here are some common methods for processing XML strings:

1. Convert an XML string to an XMLType data type.

SELECT XMLType('<book><title>Oracle Database</title></book>') FROM dual;

1. Extract specific elements or attributes from an XML string.

SELECT XMLType('<book><title>Oracle Database</title></book>').extract('//title/text()') FROM dual;

1. Update elements or attributes in an XML string.

UPDATE books SET xml_column = xml_column.modify('replace value of (/book/title/text())[1] with "New Title"') WHERE id = 1;

1. Querying data in an XML string using the XPath query language.

SELECT XMLType('<book><title>Oracle Database</title></book>').extract('/book/title/text()').getStringVal() FROM dual;

1. Convert XML string to a different data type.

SELECT XMLType('<book><title>Oracle Database</title></book>').getClobVal() FROM dual;

Using these methods, Oracle can easily manage XML strings and manipulate/query the data within them.