Oracle update xml schema

Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Ask Question. Asked 4 years, 5 months ago.

Active 4 years, 5 months ago. Viewed times. How can I generalise my code to work for my non-schema xml file? Mick Greener. Mick Greener Mick Greener 93 1 1 silver badge 15 15 bronze badges. The exception is being thrown by your trigger, not the update itself; so what is the trigger doing? Sorry for some reason I did not add in the full error message, I have edited the post now.

One such example is an XML schema, registered for object-relational storage mapping, that is evolved by splitting a complex type into two complex types. Even if this XML schema has no associated instance documents, and therefore no data copy is required, a change in the layout of existing tables is required to accommodate future instance documents. These code excerpts show the definitions of the original ShippingInstructionsType type and the new Person -Name and Contact-Info types.

As an example, if a complex type named ShippingInstructionsType requires that its child elements name , address , and telephone be in that order, you cannot use in-place evolution to change the order to name , telephone , and address.

You cannot use in-place evolution to change a collection to a non-collection. An example would be changing from maxOccurs greater than one to maxOccurs equal to one. In-place evolution thus cannot delete an element from a complex type if the deletion requires that a collection be evolved to a non-collection. A model is a group , choice , sequence , or all element. Within a complexType element you cannot use in-place evolution to either add a new model or replace an existing model with a model of another type for example, replace a choice element with a sequence element.

You can, however, add a global group element, that is, add a group element outside of a complexType element. Some restrictions on in-place XML schema evolution are necessary for reasons other than backward compatibility of the evolved XML schema.

For object-relational XMLType data, you cannot use in-place evolution to change a non-collection object type to a collection object type. An example would be adding an element to a complex type if the element is already present in the type or in a type related through inheritance. Some of the operations that are supported for in-place schema evolution are described. Some of these are not permitted in specific contexts, which are specified. Add an optional element to a complex type or group: Always permitted.

An example is the addition of the optional element shipmethod in the following complex type definition:. Add an optional attribute to a complex type or attribute group: Always permitted. An example is the addition of the optional attribute shipbydate in the following complex type definition:. Convert an element from simple type to complex type with simple content: Supported only if the storage model is binary XML.

Modify the value attribute of an existing maxLength element: Always permitted. The value can only be increased, not decreased. Add an enumeration value: You can add a new enumeration value only to the end of an enumeration list. Add a global element: Always permitted. An example is the addition of the global element PurchaseOrderComment in the following schema definition:.

Add or delete a global complex type: Always permitted. An example is the addition of the global complex type ComplexAddressType in the following schema definition:. Change the minOccurs attribute value: The value of minOccurs can only be decreased. Change the maxOccurs attribute value: The value of maxOccurs can only be increased, and this is only possible for data stored as binary XML.

That is, you cannot make any change to the maxOccurs attribute for data stored object-relationally. Add or delete a global group or attributeGroup : Always permitted. An example is the addition of an Instructions group in the following type definition:. Change the xdb:defaultTable attribute value: Always permitted. Changes are not permitted to any other attributes in the xdb namespace. Guidelines that apply to in-place XML-schema evolution are presented. Be sure to back up your data before performing in-place schema evolution.

Back up all existing data instance documents for the XML schema to be evolved. Make sure that you back up your data before performing in-place XML schema evolution, in case the result is not what you intended. There is no rollback possible after an in-place evolution.

If any errors occur during evolution, or if you make a major mistake and need to redo the entire operation, you must be able to go back to the backup copy of your original data. Perform a dry run using trace only, that is, without actually evolving the XML schema or updating any instance documents, produce a trace of the update operations that would be performed during evolution. After performing the dry run, examine the trace file, verifying that the listed DDL operations are in fact those that you intend.

If you are accessing the database using a client that caches data, or if you are not sure whether this is the case, then restart your client. Otherwise, the pre-evolution version of the XML schema might continue to be used locally, with unpredictable results. By Sohel Sayyad.

With the help of XML, we can perform different operations such as insert, delete and update as well as we are also able to perform the different operations on SQL data. The main feature of oracle databases is reliability, availability, scalability, and security. When we talk about the architecture of oracle XML then it uses the repository to store any type of data or document including the XML document associated with XML schema.

In the above syntax we use create table statement, here specified table name means actual table name that we need to create, and XMLTYPE is used as a column name. XMLType tables and columns are used to store large object values or we say that set of values. When we store the set of objects then we refer to structured or shredded storage.

You can use the XQuery declare namespace declaration in the prolog of an XQuery expression to define a namespace prefix. You can use declare default namespace to establish the namespace as the default namespace for the expression.

To avoid this, you can do one of the following:. Place a comment, such as : : , after the semicolon, on the same line. Example illustrates use of a namespace declaration in an XQuery expression.

An XQuery namespace declaration has no effect outside of its XQuery expression. It uses a local XMLType instance to store transient data. They then insert that data into a relational table. Example tabulates the purchase orders whose shipping address contains the string " Shores " and which were requested by customers whose names contain the string " ll " double L. These purchase orders are grouped by customer and counted. The example uses XQuery Full Text to perform full-text search. Example extracts the fragments of a document that are identified by an XPath expression.

You cannot insert fragments into XMLType columns. Execution is identical, with the same optimizations. A typical use case for this feature is to access data stored in remote databases from a local Java program. These are then passed to XQuery as XQuery variables itemno and id , respectively. NET and the C language. The C input parameters :nbitems and :partid are passed to XQuery as XQuery variables itemno and id , respectively. This can be created in any of the following ways:.

The entire document is updated, not just the part of it that is selected. In real-world examples you will typically pass a value that is available only at runtime; Example shows how to do that. This is also true of other examples.

Example updates multiple text nodes and attribute nodes. 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.