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Converts a Visual FoxPro cursor to XML.

CURSORTOXML(nWorkArea | cTableAlias, cOutput [, nOutputFormat 
[, nFlags [, nRecords [, cSchemaName [, cSchemaLocation [, cNameSpace ]]]]]])

Parameters

nWorkArea


Specifies the work area of the table from which to create the XML string. If you specify 0 or no value, Visual FoxPro uses the current work area.
cTableAlias


Specifies the alias of the table from which to create the XML string.
cOutput


Specifies the path and file name or memory variable name to which results are sent. If nFlags is set to 0 (default) for memory variable output, XML is returned to the memory variable. If the memory variable does not exist, it is created. If nFlags is set to 512 for file output, and the file does not exist, it is created. If the file already exists, it is overwritten. The setting for SET SAFETY is observed.
nOutputFormat


Specifies the output format of the XML string. The following table lists the values for nOutputFormat.

nOuputFormat Description

1 – ELEMENTS

(Default) Element-centric XML

2 – ATTRIBUTES

Attribute-centric XML

3 – RAW

Generic, attribute-centric XML

nFlags


Specifies the formatting of the XML that is produced and its destination. The following table lists the values for nFlags.

nFlags Bit Output description

0

0000

(Default) Produce XML in UTF-8 format.

This setting creates a memory variable if one does not exist when specified by cOutput and returns XML to the memory variable.

The XML declaration does not contain an Encoding= attribute; that is, no encoding attribute is set to UTF-8.

1

0001

Produce unformatted XML as a continuous string.

2

0010

Enclose empty elements with open and closing elements, for example, <cc04><cc04/>.

4

0100

Preserve white space in fields.

8

1000

Wrap Memo fields in CDATA sections.

16

10000

Output encoding. Output is set to the cursor code page.

To ensure accurate character translation, the Visual FoxPro default code page must match the code page of the cursor. You can accomplish this by setting character and memo fields in the cursor to NOCPTRAN (character binary/memo binary).

When setting this value with tables using any of the code pages, the encoding attribute in the XML is set to an empty string (""). To change to the correct encoding attribute, use the STRTRAN(В ) function.

For example, for code page 936, provide the following to the resulting XML string:

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strxml=STRTRAN(strxml, 'encoding=""', 'encoding="gb2312"'

32

100000

Output encoding.

512

1000000000

Output to the file specified by cOutput.

If a file does not exist, it is created. If the file already exists, it is overwritten. The setting for SET SAFETY is observed.

4096

1000000000000

Disables base64 encoding.

CURSORTOXML(В ) exports Memo (Binary) fields as xsd:base64binary unless you use nFlags set to 4096. In Visual FoxPro, base64 encoding is meant for encoding only binary data.

32768

none

Indicates that a code page should be used.

The following table describes how the encoding attribute is written when output encoding defaults to the cursor or table code page.
Note:
Encoding flags are set by combining bits 4 and 5 (0010000).

Encoding flag Bits 4 and 5 Description

+0

00

(Default) Windows-1252.

+16

01

Set output encoding attribute to the cursor code page.

+32

10

Set output encoding attribute to UTF-8 with no character translation.

+48

11

Set output encoding attribute to UTF-8 and translate character data to UTF-8.

The following table lists common Windows-compatible code pages.

Code page Platform Encoding attribute in XML Declaration Comments

437

MS-DOS, US

ibm437

В 

850

MS-DOS, International

ibm850

В 

865

MS-DOS, Nordic

Empty string ("")

В 

866

MS-DOS, Russian

cp866

В 

932

Windows, Japanese

shift-jis

В 

936

Simplified Chinese

gb2312

В 

949

Windows, Korean

iso-2022-kr

or:

ks_c_5601-1987

950

Windows, Traditional Chinese (Taiwan)

big5

В 

1250

Windows, East European

Windows-1250

Note case.

1251

Windows, Russian

Windows-1251

В 

1252

Windows, U.S., West European

Windows-1252

В 

1253

Windows, Greek

Windows-1253

В 

1254

Windows, Turkish

Windows-1254

В 

1255

Windows, Hebrew

Windows-1255

В 

1256

Windows, Arabic

Windows-1256

В 

Note:
Visual FoxPro uses Windows-1252 as the default encoding. You can specify that the encoding attribute be set to match the code page, such as Big5 (code page 950), when using double-byte character sets (DBCS) for DBCS languages for which Visual FoxPro supports code pages.

When using Windows-1252 and DBCS, no additional character translation is required to display correctly in Internet Explorer. However, to make XML more compliant for Web browsers that can interpret UTF-8, you can optionally set the encoding attribute to UTF-8 instead of Windows-1252. The result set undergoes translation to UTF-8 characters only when you set nFlags to 48 (specify the encoding attribute as UTF-8 and translate character data to UTF-8 format). This is required only when the data actually contains double-byte characters. You do not have to use character translation, STRCONV (В ), for example, if you are outputting only Latin (single byte) characters.
nRecords


Specifies the number of records to output to XML and has a default value is 0. If nRecords is 0, all records are output. If nRecords is greater than the number of records remaining in the table, all remaining records are output.
cSchemaName


Specifies the name and location to contain schema information for the data in cOutput, for example "MySchema.xsd". If no extension is provided, the schema file is created with an .xsd extension. The following table lists the values for cSchemaName.

cSchemaName Description

cSchemaName

Specifies the name and path of the external file for the schema (scoped to the root element of the XML).

Note:
If cSchemaName contains a file name and cSchemaLocation is not provided or is blank, the contents of cSchemaName are written to the xsi:schemaLocation or xsi:noNamespaceSchemaLocation attribute in the XML.

In the following example, Visual FoxPro generates a generic XML file named MyXMLFile.xml from the Labels.dbf file in the "Labels" alias and the schema file named MySchema in the same folder.

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CURSORTOXML("LABELS", "myXMLFile.xml", 1, 512, 0, "mySchema.xsd")

If cSchemaName includes a URI, the schema is written to the current directory and must be uploaded to the server to be accessed by the browser or parser. External schemas always are written to the same location as the XML file.

"1"

Specifies an inline schema is produced. For example, the following code produces an inline schema:

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CURSORTOXML("LABELS", "myXMLFile.xml", 1, 512, 0, "1")

""

Specifies that no schema is produced.

cSchemaLocation


Specifies an optional location where the application reading the XML data should look for the schema file.
Note:
Use this parameter only when you are deploying your schema to a location other than the location of the XML data.

The contents of cSchemaLocation are written to the xsi:schemaLocation or xsi:noNamespaceSchemaLocation attribute of the XML data produced. The cschemaLocation parameter can be an HTTP address or other URI. You need to copy the schema file to the location you have specified in cSchemaLocation. The following example produces XML data:
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   CURSORTOXML("LABELS", "myXMLFile.xml", 1, 512, 0, ;
       "mySchema.xsd", "http://www.microsoft.com/mySchema.xsd")
containing the following attribute:
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   xsi:noNamespaceSchemaLocation=" http://www.microsoft.com/mySchema.xsd"
Specifying cSchemaLocation when cSchemaName is blank causes the same attributes to be written to the XML data. This makes it possible for you to point to an existing schema without recreating the schema each time CURSORTOXML( ) is called.
cNamespace


Specifies the namespace of the XML or schema to be produced and has an empty string ("") as the default value. Specifying a value for cNameSpace sets the targetNamespace attribute to the same value and adds the elementFormDefault="qualified" attribute to the schema. If you do not specify a cNamespace value, and the schema is external, no namespace declaration is written to the schema. If you do not specify a cNamespace value and the schema is inline, the targetNamespace in the schema is set to an empty string ("").

Return Value

Numeric data type. CURSORTOXML(В ) returns the number of bytes written to the file or a memory variable.

Remarks

You can use CURSORTOXML( ) with the OLE DB Provider for Visual FoxPro. However, the _VFPВ VFPXMLProgID property is not supported because the _VFP system variable is not supported in the OLE DB Provider.

Note:
To use the Visual FoxPro OLE DB Provider with CURSORTOXML( ), you must install MSXMLВ 3.0 on the computer with the OLE DB Provider.

CURSORTOXML(В ) output adheres to the cursor index order, SET FIELDS TO, and current filter settings. However, it does not preserve the cursor location. After the calling CURSORTOXML( ), if all records are output, the cursor record pointer reports EOF. If not all records are output, it points to the last record output to XML.

The resulting XML from CURSORTOXML( ) contains the same scale as the exported table if the table contains Double data type values. For example, if a Double column is created with a scale of 6 using the following codem the resulting XML contains six digits to the right of the decimal point:

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CREATE TABLE test (col1 b(6))

When you use the CURSORTOXML( ) function to export a table or cursor to XML, the root node is always called "VFPData", regardless of the output format.

For Date types only, you can export "EMPTY" Date and DateTime types using CURSORTOXML( ). However, the XML schema validation might fail because "EMPTY" is not valid for these types in an XML schema definition (XSD) schema. This is an issue only if a schema is required, and the resulting XML is validated against an XML parser that can interpret XSD schemas. To work around this issue, you might need to change the data to a nonempty representation by calling the appropriate SELECT statement and use CURSORTOXML( ) on the created cursor. For example, you can change the empty Date or DateTime values to .NULL.:

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SELECT orderid, EVL(shippeddate,.NULL.) as ShippedDate FROM orders

You can also change the empty Date or DateTime to an appropriate representation for "empty":

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SELECT orderid, IIF(EMPTY(shippeddate),{^1899-12-30 00:00:00},tc11); 
   as ShippedDate FROM orders

When using flag 32768, the flags 16 and 32 settings can affect which code page is applied depending on the type of data you are writing to XML. The following tables show the possible combinations of settings and the code page each combination applies.

For XML documents written with the 32768 flag set, the following code pages are applied.

Flag 16

Flag 32

Flag 32768 is Set

Not set

Not set

XML documents: Window-1252.

Unicode data: code page 1252.

Character data: default code page, unless a field is marked as NOCPTRANS.

True (.T)

Not set

XML documents: Plus-CodePage property of the cursor. If XMLField CodePage property is greater than zero (0) and it doesn’t match the cursor’s code page, an error is reported.

Unicode data: the Code page property of the cursor object.

Character data: none. Raw data from the Visual FoxPro tables (.dbf) are used instead.

Not set

Set

XML documents: UTF-8 code page.

Unicode data: UTF-8 code page.

Character data: Default code page unless field is marked as NOCPTRANS, in which case no additional character translation to UTF-8 occurs.

Set

Set

XML documents: UTF-8 code page.

Unicode data: UTF-8 code page.

Character data: default code page unless a field is marked as NOCPTRANS, in which case the data are translated to UTF-8 using the SYS(3005) setting.

For XML documents written without setting the 32768 flag, the following code pages are applied.

Flag 16

Flag 32

Without the 32768 flag

Not set

Not set

XML documents: Window-1252.

Unicode data: code page 1252.

Character data: default code page unless a field is marked as NOCPTRANS.

True (.T)

Not set

XML documents: CodePage property of the cursor.

Character data: none. Raw data from the Visual FoxPro tables (.dbf) are used instead.

Unicode data: code page property of the cursor object.

Not set

Set

XML documents: UTF-8 code page.

Unicode data: UTF-8 code page.

Character data: default code page unless field is marked as NOCPTRANS, in which case no additional character translation to UTF-8 occurs.

Set

Set

XML documents: UTF-8 code page.

Unicode data: UTF-8 code page.

Character data: default code page unless field is marked as NOCPTRANS, in which case, they are translated to UTF-8 using code page for the current SYS(3005) setting.

See Also



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