117
DBMS_XMLSAVE

DBMS_XMLSAVE provides XML to database-type functionality.

This chapter contains the following topics:

• Using DBMS_XMLSAVE
  • Constants
  • Types
• Summary of DBMS_XMLSAVE Subprograms

Using DBMS_XMLSAVE

Constants

Table 117-1  Constants of DBMS_XMLSAVE

DEFAULT_ROWTAG 

DEFAULT_DATE_FORMAT

MATCH_CASE

IGNORE_CASE

Types

Table 117-2  Types of DBMS_XMLSAVE

ctxType

Summary of DBMS_XMLSAVE Subprograms

Table 117-3  DBMS_XMLSAVE Package Subprograms

CLEARKEYCOLUMNLIST

Clears the key column list.

Syntax

PROCEDURE clearKeyColumnList(
   ctxHdl IN ctxType);

ctxHdl

(IN)

CLEARUPDATECOLUMNLIST

Clears the update column list.

Syntax

PROCEDURE clearUpdateColumnList(
   ctxHdl IN ctxType);

ctxHdl

(IN)

CLOSECONTEXT

Closes/deallocates a particular save context.

Syntax

PROCEDURE closeContext(
   ctxHdl IN ctxType);

ctxHdl

(IN)

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. The options are described in the following table.

FUNCTION  deleteXML(
   ctxHdl IN ctxPType, 
   xDoc IN VARCHAR2) 
RETURN NUMBER;

FUNCTION  deleteXML( 
   ctxHdl IN ctxType, 
   xDoc IN CLOB) 
RETURN NUMBER;

ctxHdl

(IN)

xDoc

(IN)

GETEXCEPTIONCONTENT

Through its arguments, this method returns the thrown exception's error code and error message, SQL error code. This is to get around the fact that the JVM throws an exception on top of whatever exception was raised; thus, rendering PL/SQL unable to access the original exception.

Syntax

PROCEDURE getExceptionContent(
   ctxHdl IN ctxType,
   errNo OUT NUMBER,
   errMsg OUT VARCHAR2);

ctxHdl

(IN)

errNo

(IN)

errMsg

(IN)

INSERTXML

Inserts the XML document into the table specified at the context creation time, and returns the number of rows inserted. The options are described in the following table.

FUNCTION  insertXML(
   ctxHdl IN ctxType, 
   xDoc IN VARCHAR2) 
RETURN NUMBER;

FUNCTION  insertXML(
   ctxHdl IN ctxType,
   xDoc IN CLOB) 
RETURN NUMBER;

ctxHdl

(IN)

xDoc

(IN)

NEWCONTEXT

Creates a save context, and returns the context handle.

Syntax

FUNCTION newContext(
   targetTable IN VARCHAR2)
RETURN ctxType;

targetTable

(IN)

PROPAGATEORIGINALEXCEPTION

Tells the XSU that if an exception is raised, and is being thrown, the XSU should throw the very exception raised; rather then, wrapping it with an OracleXMLSQLException.

Syntax

PROCEDURE propagateOriginalException(
   ctxHdl IN ctxType,
   flag IN BOOLEAN);

ctxHdl

(IN)

flag

(IN)

REMOVEXSLTPARAM

Removes the value of a top-level stylesheet parameter.

Syntax

PROCEDURE removeXSLTParam(
   ctxHdl IN ctxType, 
   name IN VARCHAR2);

ctxHdl

(IN)

name

(IN)

SETBATCHSIZE

Changes the batch size used during DML operations. When performing inserts, updates or deletes, it is better to batch the operations so that they get executed in one shot rather than as separate statements. The flip side is that more memory is needed to buffer all the bind values. Note that when batching is used, a commit occurs only after a batch is executed. So if one of the statement inside a batch fails, the whole batch is rolled back. This is a small price to pay considering the performance gain; nevertheless, if this behavior is unacceptable, then set the batch size to 1.

Syntax

PROCEDURE setBatchSize(
   ctxHdl IN ctxType,
   batchSize IN NUMBER);

ctxHdl

(IN)

batchSize

(IN)

SETCOMMITBATCH

Sets the commit batch size. The commit batch size refers to the number or records inserted after which a commit should follow. If batchSize is less than 1 or the session is in "auto-commit" mode, using the XSU does not make any explicit commits. By default, commitBatch is 0.

Syntax

PROCEDURE setCommitBatch(
   ctxHdl IN ctxType,
   batchSize IN NUMBER);

ctxHdl

(IN)

batchSize

(IN)

SETDATEFORMAT

Sets the format of the generated dates in the XML document. The syntax of the date format patern, the date mask, should conform to the requirements of the class java.text.SimpleDateFormat. Setting the mask to <code>null</code> or an empty string unsets the date mask.

Syntax

PROCEDURE setDateFormat(
   ctxHdl IN ctxType,
   mask IN VARCHAR2);

ctxHdl

(IN)

mask

(IN)

SETIGNORECASE

The XSU does mapping of XML elements to db columns/attributes based on the element names (XML tags). This function tells the XSU to do this match case insensitive.

Syntax

PROCEDURE setIgnoreCase(
   ctxHdl IN ctxType,
   flag IN NUMBER);

ctxHdl

(IN)

flag

(IN)

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);

ctxHdl

(IN)

colName

(IN)

SETPRESERVEWHITESPACE

Tells the XSU whether or not to preserve whitespace.

Syntax

PROCEDURE setPreserveWhitespace(
   ctxHdl IN ctxType,
   flag IN BOOLEAN := true);

ctxHdl

(IN)

flag

(IN)

SETROWTAG

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

Syntax

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

ctxHdl

(IN)

tag

(IN)

SETSQLTOXMLNAMEESCAPING

Turns on or off escaping of XML tags in the case that the SQL object name, which is mapped to a XML identifier, is not a valid XML identifier.

Syntax

PROCEDURE setSQLToXMLNameEscaping(
   ctxHdl IN ctxType,
   flag IN BOOLEAN := true);

ctxHdl

(IN)

flag

(IN)

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.

Syntax

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

ctxHdl

(IN)

colName

(IN)

SETXSLT

Registers an XSL transform to be applied to the XML to be saved. If a stylesheet was already registered, it gets replaced by the new one. To un-register the stylesheet, pass in null for the URI. The options are described in the following table.

PROCEDURE setXSLT( 
   ctxHdl IN ctxType,
   uri IN VARCHAR2,
   ref IN VARCHAR2 := null);

PROCEDURE setXSLT(
   ctxHdl IN ctxType, 
   stylesheet IN CLOB, 
   ref IN VARCHAR2 := null);

ctxHdl

(IN)

uri

(IN)

ref

(IN)

stylesheet

(IN)

SETXSLTPARAM

Sets the value of a top-level stylesheet parameter. The parameter is expected to be a valid XPath expression; literal values would therefore have to be explicitly quoted.

Syntax

PROCEDURE setXSLTParam(
   ctxHdl IN ctxType,
   name IN VARCHAR2,
   value IN VARCHAR2);

ctxHdl

(IN)

name

(IN)

value

(IN)

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.

FUNCTION  updateXML( 
   ctxHdl IN ctxType,
   xDoc IN VARCHAR2) 
RETURN NUMBER;

FUNCTION  updateXML(
   ctxHdl IN ctxType, 
   xDoc IN CLOB)
RETURN NUMBER;

ctxHdl

(IN)

xDoc

(IN)