177 DBMS_XMLSTORE

DBMS_XMLSTORE provides the ability to store XML data in relational tables.

Using DBMS_XMLSTORE

Types

Types

Table 177-1 Types of DBMS_XMLSTORE

Type	Description
`ctxType`	The type of the query context handle. This is the return type of NEWCONTEXT.

Summary of DBMS_XMLSTORE Subprograms

Table 177-2 DBMS_XMLSTORE Package Subprograms

Method	Description
CLEARKEYCOLUMNLIST	Clears the key column list.
CLEARUPDATECOLUMNLIST	Clears the update column list.
CLOSECONTEXT	It closes/deallocates a particular save context.
DELETEXML	Deletes records specified by data from the XML document, from the table specified at the context creation time.
INSERTXML	Inserts the XML document into the table specified at the context creation time.
NEWCONTEXT	Creates a save context, and returns the context handle.
SETKEYCOLUMN	This method adds a column to the key column list.
SETROWTAG	Names the tag used in the XML document., to enclose the XML elements corresponding to the database.
SETUPDATECOLUMN	Adds a column to the "update column list".
UPDATEXML	Updates the table given the XML document.

CLEARKEYCOLUMNLIST

Clears the key column list.

Syntax

PROCEDURE clearKeyColumnList(
   ctxHdl IN ctxType);

Parameter	IN / OUT	Description
`ctxHdl`	`(IN)`	Context handle.

CLEARUPDATECOLUMNLIST

Clears the update column list.

Syntax

PROCEDURE clearUpdateColumnList(
   ctxHdl IN ctxType);

Parameter	IN / OUT	Description
`ctxHdl`	`(IN)`	Context handle.

CLOSECONTEXT

Closes/deallocates a particular save context.

Syntax

PROCEDURE closeContext(
   ctxHdl IN ctxType);

Parameter	IN / OUT	Description
`ctxHdl`	`(IN)`	Context handle.

DELETEXML

Deletes records specified by data from the XML document from the table specified at the context creation time, and returns the number of rows deleted.

Syntax Description

Syntax	Description
`FUNCTION deleteXML(` `ctxHdl IN ctxPType,` `xDoc IN VARCHAR2)` `RETURN NUMBER;`	Uses a `VARCHAR2` type for the `xDoc` parameter.
`FUNCTION deleteXML(` `ctxHdl IN ctxType,` `xDoc IN CLOB)` `RETURN NUMBER;`	Uses a `CLOB` type for the `xDoc` parameter.
`FUNCTION deleteXML(` `ctxHdl IN ctxType,` `xDoc IN XMLType)` `RETURN NUMBER;`	Uses an `XMLType` type for the `xDoc` parameter.

FUNCTION deleteXML(

ctxHdl IN ctxPType,

xDoc IN VARCHAR2)

RETURN NUMBER;

Uses a VARCHAR2 type for the xDoc parameter.

FUNCTION deleteXML(

ctxHdl IN ctxType,

xDoc IN CLOB)

RETURN NUMBER;

Uses a CLOB type for the xDoc parameter.

FUNCTION deleteXML(

ctxHdl IN ctxType,

xDoc IN XMLType)

RETURN NUMBER;

Uses an XMLType type for the xDoc parameter.

Parameter	IN / OUT	Description
`ctxHdl`	`(IN)`	Context handle.
`xDoc`	`(IN)`	String containing the XML document.

INSERTXML

Inserts the XML document into the table specified at the context creation time, and returns the number of rows inserted.

Note that if a user passes an XML file for insertXML to DBMS_XMLSTORE which contains extra elements (ones that do not match up to any columns in the table), Oracle will try to insert into those columns unless SETUPDATECOLUMN is used. The use of setUpdateColumn is optional only if the elements in the XML file match up to the columns in the table.

Syntax Description

Syntax	Description
`FUNCTION insertXML(` `ctxHdl IN ctxType,` `xDoc IN VARCHAR2)` `RETURN NUMBER;`	Passes in the `xDoc` parameter as a `VARCHAR2`.
`FUNCTION insertXML(` `ctxHdl IN ctxType,` `xDoc IN CLOB)` `RETURN NUMBER;`	Passes in the `xDoc` parameter as a `CLOB`.
`FUNCTION insertXML(` `ctxHdl IN ctxType,` `xDoc IN XMLType)` `RETURN NUMBER;`	Passes in the `xDoc` parameter as an `XMLType`.

FUNCTION insertXML(

ctxHdl IN ctxType,

xDoc IN VARCHAR2)

RETURN NUMBER;

Passes in the xDoc parameter as a VARCHAR2.

FUNCTION insertXML(

ctxHdl IN ctxType,

xDoc IN CLOB)

RETURN NUMBER;

Passes in the xDoc parameter as a CLOB.

FUNCTION insertXML(

ctxHdl IN ctxType,

xDoc IN XMLType)

RETURN NUMBER;

Passes in the xDoc parameter as an XMLType.

Parameter	IN / OUT	Description
`ctxHdl`	`(IN)`	Context handle.
`xDoc`	`(IN)`	String containing the XML document.

NEWCONTEXT

Creates a save context, and returns the context handle.

Syntax

FUNCTION newContext(
   targetTable IN VARCHAR2)
RETURN ctxType;

Parameter	IN / OUT	Description
`targetTable`	`(IN)`	The target table into which to load the XML document.

SETKEYCOLUMN

This method adds a column to the "key column list". The value for the column cannot be NULL. In case of update or delete, the columns in the key column list make up the WHERE clause of the statement. The key columns list must be specified before updates can complete; this is optional for delete operations

Syntax

PROCEDURE setKeyColumn( 
   ctxHdl IN ctxType,
   colName IN VARCHAR2);

Parameter	IN / OUT	Description
`ctxHdl`	`(IN)`	Context handle.
`colName`	`(IN)`	Column to be added to the key column list; cannot be `NULL`.

SETROWTAG

Names the tag used in the XML document, to enclose the XML elements corresponding to databse records.

Syntax

PROCEDURE setRowTag(
   ctxHdl IN ctxType,
   tag IN VARCHAR2);

Parameter	IN / OUT	Description
`ctxHdl`	`(IN)`	Context handle.
`tag`	`(IN)`	Tag name.

SETUPDATECOLUMN

Adds a column to the update column list. In case of insert, the default is to insert values to all the columns in the table; on the other hand, in case of updates, the default is to only update the columns corresponding to the tags present in the ROW element of the XML document. When the update column list is specified, the columns making up this list alone will get updated or inserted into.

Note that if a user passes an XML file for INSERTXML to DBMS_XMLSTORE which contains extra elements (ones that do not match up to any columns in the table), Oracle will try to insert into those columns unless setUpdateColumn is used. The use of setUpdateColumn is optional only if the elements in the XML file match up to the columns in the table.

Syntax

PROCEDURE setUpdateColumn( 
   ctxHdl IN ctxType,
   colName IN VARCHAR2);

Parameter	IN / OUT	Description
`ctxHdl`	`(IN)`	Context handle.
`colName`	`(IN)`	Column to be added to the update column list.

UPDATEXML

Updates the table specified at the context creation time with data from the XML document, and returns the number of rows updated. The options are described in the following table.

Syntax Description

Syntax	Description
`FUNCTION updateXML(` `ctxHdl IN ctxType,` `xDoc IN VARCHAR2)` `RETURN NUMBER;`	Passes in the `xDoc` parameter as a `VARCHAR2`.
`FUNCTION updateXML(` `ctxHdl IN ctxType,` `xDoc IN CLOB)` `RETURN NUMBER;`	Passes in the `xDoc` parameter as a `CLOB`.
`FUNCTION updateXML(` `ctxHdl IN ctxType,` `xDoc IN XMLType)` `RETURN NUMBER;`	Passes in the `xDoc` parameter as a `XMLType`.

FUNCTION updateXML(

ctxHdl IN ctxType,

xDoc IN VARCHAR2)

RETURN NUMBER;

Passes in the xDoc parameter as a VARCHAR2.

FUNCTION updateXML(

ctxHdl IN ctxType,

xDoc IN CLOB)

RETURN NUMBER;

Passes in the xDoc parameter as a CLOB.

FUNCTION updateXML(

ctxHdl IN ctxType,

xDoc IN XMLType)

RETURN NUMBER;

Passes in the xDoc parameter as a XMLType.

Parameter	IN / OUT	Description
`ctxHdl`	`(IN)`	Context handle.
`xDoc`	`(IN)`	String containing the XML document.