Sql server updating existing xml data using replace function

OBJECT_VALUE COLUMNS reference VARCHAR2(28) PATH 'Reference', lineitem XMLType PATH 'Line Items/Line Item') t, XMLTable('Line Item' PASSING t.lineitem COLUMNS lineno NUMBER(10) PATH '@Item Number', upc VARCHAR2(14) PATH 'Part/@Id', description VARCHAR2(128) PATH 'Description', quantity NUMBER(10) PATH 'Part/@Quantity', unitprice NUMBER(12,2) PATH 'Part/@Unit Price') li WHERE t.reference = 'EABEL-20021009123336251PDT'; SELECT reference, userid, shiptoname, specialinstructions FROM purchaseorder_table; REFERENCE USERID SHIPTONAME SPECIALINSTRUCTIONS -------------------------------- -------- ------------------------------------------------ ------------------- EABEL-20021009123336251PDT EABEL Ellen S. OBJECT_VALUE COLUMNS reference VARCHAR2(28) PATH 'Reference', requestor VARCHAR2(48) PATH 'Requestor', actions XMLType PATH 'Actions', userid VARCHAR2(32) PATH 'User', costcenter VARCHAR2(3) PATH 'Cost Center', shiptoname VARCHAR2(48) PATH 'Shipping Instructions/name', address VARCHAR2(512) PATH 'Shipping Instructions/address', phone VARCHAR2(32) PATH 'Shipping Instructions/telephone', rejectedby VARCHAR2(32) PATH 'Reject/User', daterejected DATE PATH 'Reject/Date', comments VARCHAR2(2048) PATH 'Reject/Comments', specialinstructions VARCHAR2(2048) PATH 'Special Instructions') t WHERE t.reference = 'EABEL-20021009123336251PDT'; INSERT INTO purchaseorder_lineitem (reference, lineno, upc, description, quantity, unitprice) SELECT t.reference, li.lineno, li.upc, li.description, li.quantity, li.unitprice FROM purchaseorder p, XMLTable('/Purchase Order' PASSING p.The XML Data type has definite uses, but the way of interrogating, retrieving, and manipulating the values of properties and attributes within XML have been so foreign to the SQL language as to be somewhat of a barrier to their use.Fortunately, Robert Sheldon has once more managed to make the subject accessible to those of us who just need to get the job done. Based on those examples, it might seem that retrieving XML data is similar to retrieving objects configured with other data types.However, that’s true only when returning the entire XML value.If instead you want to work with individual components within an XML instance, such as when retrieving the value of a single attribute, you must use one of the five methods that available to the methods require only one argument: an XQuery expression that identifies the XML components to be retrieved or modified, and any actions to be taken on those components.Applying an XPath expression to an XML document can result in a set of nodes.For example, the expression , return the input XML data unchanged.

The xml data type comes with its own set of methods for processing xml data.

The xml data type methods utilize XQuery expressions to specify the portion of the XML on which to operate.

In the case of the modify() method, extensions to XQuery were necessary to provide the data manipulation capabilities.

The first argument is a SQL expression that is evaluated.

Any of the following SQL data types can be used as the second argument: argument is an XML value.

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