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<!DOCTYPE HTML PUBLIC>
<HTML>
<TITLE>Xbase DBMS Chapter 13</TITLE>
<BODY BGCOLOR=#FFFFFF>
<H1><p align="center">Field Methods</p></H1>
<p align="center">Chapter Updated 2/1/99</p><hr>
This chapter lists the field methods and provides examples of how to use
them.<br><br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Xbase Field Method List</h3></CAPTION>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Method<TD>Description
<TR><TH ALIGN="LEFT">xbLong cnt FieldCount()<TD>Returns the number of fields
in the file
<TR><TH ALIGN="LEFT">xbDouble d GetDoubleField(char * FieldName)<TD>Returns a xbDouble field for field name
<TR><TH ALIGN="LEFT">xbDouble d GetDoubleField(xbShort FieldNo)<TD>Returns a xbDouble field for field number
<TR><TH ALIGN="LEFT">xbShort rc GetField(xbShort,char *buf)<TD>Gets field data from the record buffer
<TR><TH ALIGN="LEFT">xbShort d GetFieldDecimal(xbShort FieldNo)<TD>Gets field decimal count
<TR><TH ALIGN="LEFT">xbShort len GetFieldLen(xbShort FieldNo)<TD>Returns the length of a given field
<TR><TH ALIGN="LEFT">char * name GetFieldName(xbShort FieldNo)<TD>Returns field name for field number
<TR><TH ALIGN="LEFT">xbShort FieldNo GetFieldNo(char * FieldName)<TD>Returns the field ID number for a given field
<TR><TH ALIGN="LEFT">char type GetFieldType(xbShort FieldNo)<TD>Returns the type of a given field
<TR><TH ALIGN="LEFT">xbFloat f GetFloatField(char * FieldName)<TD>Returns a float field for field name
<TR><TH ALIGN="LEFT">xbFloat f GetFloatField(xbShort FieldNo)<TD>Returns a float field for field number
<TR><TH ALIGN="LEFT">xbShort l GetLogicalField(xbShort FieldNo)<TD>Returns logical field data
<TR><TH ALIGN="LEFT">xbShort l GetLogicalField(char * FieldName)<TD>Returns logical field data
<TR><TH ALIGN="LEFT">xbLong l GetLongField(char * FieldName)<TD>Returns a long field for field name
<TR><TH ALIGN="LEFT">xbLong l GetLongField(xbShort FieldNo)<TD>Returns a long field for field number
<TR><TH ALIGN="LEFT">xbShort rc GetMemoField(xbShort FieldNo,<br>xbLong len,char * buf)<TD>Get memo field data
<TR><TH ALIGN="LEFT">xbLong len GetMemoFieldLen(xbShort FieldNo)<TD>Get memo field data length
<TR><TH ALIGN="LEFT">xbShort s MemoFieldsPresent()<TD>Determine if memo fields exist in DBF file
<TR><TH ALIGN="LEFT">xbShort s MemoFieldExists(xbShort FieldNo)<TD>Determine if a particular memo field has data
<TR><TH ALIGN="LEFT">xbShort rc PutDoubleField(char * FieldName,<br>xbDouble d)<TD>Updates a xbDouble field for field name
<TR><TH ALIGN="LEFT">xbShort rc PutDoubleField(xbShort FieldNo,<br>xbDouble d)<TD>Updates a xbDouble field for field number
<TR><TH ALIGN="LEFT">xbShort rc PutField(xbShort FieldNo,char * val)<TD>Fills or overlays a field in the current record buffer
</TABLE>
<br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Xbase Field Method List (cont)</h3></CAPTION>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Method<TD>Description
<TR><TH ALIGN="LEFT">xbShort rc PutFloatField(char * FieldName,<br>xbFloat f)<TD>Updates a float field for field name
<TR><TH ALIGN="LEFT">xbShort rc PutFloatField(xbShort FieldNo,<br>xbFloat f)<TD>Updates a float field for field number
<TR><TH ALIGN="LEFT">xbShort rc PutLongField(char * FieldName,<br>xbLong l)<TD>Updates a long field for field name
<TR><TH ALIGN="LEFT">xbShort rc PutLongField(xbShort FieldNo,<br>xbLong l)<TD>Updates a long field for field number
<TR><TH ALIGN="LEFT">xbShort rc UpdateMemoData(xbShort FieldNo,<br>xbLong len,char * buf,
xbShort LockOpt)<TD>Update memo field data
<TR><TH ALIGN="LEFT">xbShort l ValidLogicalData( char * buf )<TD>Check for valid logical data
<TR><TH ALIGN="LEFT">xbShort l ValidNumericData( char * buf )<TD>Check for valid numeric data
</TABLE>
<BR><BR>
<hr>
<h2>Method Definitions</h2>
<hr>
<h3>Method xbLong xbDbf::FieldCount( void )</h3><br>
This method returns the number of fields which exist in the database.
<br><br>
<h4>Method Return Codes</h4><br>
If successful, this method returns the number of fields in the database.
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/sample3.cpp">sample3.cpp</A> for an
example of how to use this method.
<hr>
<h3>Method xbDouble xbDbf::GetxbDoubleField( char * FieldNo )</h3><br>
This method returns a xbDouble value for field FieldNo. Fieldno can be retrieved
by using method GetFieldNo.
<br><br>
<hr>
<h3>Method xbDouble xbDbf::GetxbDoubleField( char * FieldName )</h3><br>
This method returns a xbDouble value for field FieldName. If multiple accesses
for this particular field will be made from within the program, it is more
efficient to access the data utlizing the field's number, rather than its name.
<br><br>
<hr>
<h3>Method xbShort xbDbf::GetField( xbShort FieldNo, char * buf )</h3><br>
This method fills an application program supplied buffer *buf with data
from the record buffer for field number FieldNo. FieldNo can be retrieved
by using method GetFieldNo.<br><br>
It is the responsibility of the application program to verify the buffer is
large enough to hold the data. No checking is done by method GetField to
verify the buffer is large enough to hold the data.<br><br>
If successful, this method returns the length of the field in bytes.
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/sample3.cpp">sample3.cpp</A> for an
example of how to use this method.
<hr>
<h3>Method xbShort xbDbf::GetFieldDecimal( xbShort FieldNo )</h3><br>
This method returns the decimal count of field FieldNo. FieldNo can be retrieved
by using method GetFieldNo.<br><br>
If successful, this method returns the decimal count.
<hr>
<h3>Method xbShort xbDbf::GetFieldLen( xbShort FieldNo )</h3><br>
This method returns the length of field FieldNo. FieldNo can be retrieved
by using method GetFieldNo.<br><br>
If successful, this method returns the length of the field in bytes.
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/sample3.cpp">sample3.cpp</A> for an example
of how to use this method.
<hr>
<h3>Method char * xbDbf::GetFieldName( xbShort FieldNo )</h3><br>
This method returns a pointer to the name of field FieldNo. FieldNo can be retrieved
by using method GetFieldNo.<br><br>
If successful, this method returns the field name.<br>
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/dumpdbt.cpp">dumpdbt.cpp</A> for an example
of how to use this method.
<hr>
<h3>Method xbShort xbDbf::GetFieldNo( char * FieldName )</h3><br>
This method is used to get a field's ID number based on paramater
FieldName. Where FieldName is a valid name of a field in the database.<br><br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Method Return Codes</h3></CAPTION><br>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Return Code<TD>Description
<TR><TH ALIGN="LEFT">-1<TD>Field not found in record
<TR><TH ALIGN="LEFT">0 through n<TD>The field number for field FieldName
</TABLE>
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/sample2.cpp">sample2.cpp</A> for an example
of how to use this method.
<hr>
<h3>Method xbShort xbDbf::GetFieldType( xbShort FieldNo )</h3><br>
This method returns the type of field FieldNo. FieldNo can be retrieved
by using method GetFieldNo.<br><br>
<h4>Method Return Codes</h4><br>
If successful, this method returns the field type.<br>
C = character<br>
D = Date<br>
L = Logical<br>
M = Memo<br>
N = Numeric<br>
F = Float<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/sample3.cpp">sample3.cpp</A> for an example
of how to use this method.
<hr>
<h3>Method xbFloat xbDbf::GetFloatField( char * FieldName )</h3><br>
This method returns a float value for field FieldName. If multiple accesses
for this particular field will be made from within the program, it is more
efficient to access the data utlizing the field's number, rather than its name.
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/sample3.cpp">sample3.cpp</A> for an
example of how to use this method.
<hr>
<h3>Method xbFloat xbDbf::GetFloatField( xbShort * FieldNo )</h3><br>
This method returns a float value for field number FieldNo.
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/sample3.cpp">sample3.cpp</A> for an
example of how to use this method.
<hr>
<h3>Method xbShort xbDbf::GetLogicalField( xbShort FieldNo )</h3><br>
<h3>Method xbShort xbDbf::GetLogicalField( char * FieldName )</h3><br>
This method returns -1 if field <em>FieldName</em> or <em>FieldNo</em> is not
a logical field.
It returns 1 if field <em>FieldName</em> is a 'T','t','Y' or 'y'. It returns
0 if not 'T','t','Y' or 'y'.
<br>
<hr>
<h3>Method xbLong xbDbf::GetLongField( xbShort * FieldNo )</h3><br>
<h3>Method xbLong xbDbf::GetLongField( char * FieldName )</h3><br>
This method returns a long value for field FieldName. If multiple accesses
for this particular field will be made from within the program, it is more
efficient to access the data utlizing the field's number, rather than its name.
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/zips/zipinit.cpp">zipinit.cpp</A> for an
example of how to use this method.
<hr>
<h3>Method xbLong xbDbf::GetLongField( xbShort * FieldNo )</h3><br>
This method returns a long value for field FieldNo. FieldNo can be
determined by utilizing method GetFieldNo.
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/zips/zipinq.cpp">zipinq.cpp</A> for an
example of how to use this method.
<hr>
<h3>Method xbShort xbDbf::GetMemoField( xbShort FieldNo, xbLong len, char * Buf, xbShort LockOption )</h3><br>
This method returns <em>Len</em> bytes of memo field <em>FieldNo</em>. <em>Buf</em>
is a user supplied buffer large enough to contain the data. No checking
of the field's size is performed by this method.<br><br>
<em>Lock Option</em>is one of:<br>
F_SETLK - return immediately if lock fails<br>
F_SETLKW - wait until lock function executes<br><br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Method Return Codes</h3></CAPTION><br>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Return Code<TD>Description
<TR><TH ALIGN="LEFT">XB_INVALID_FIELDNO<TD>An invalid field number was used
<TR><TH ALIGN="LEFT">XB_NOT_MEMO_FIELD<TD>Not a memo field
<TR><TH ALIGN="LEFT">XB_NO_MEMO_DATA<TD>No memo data exists
<TR><TH ALIGN="LEFT">XB_INVALID_BLOCK_NO<TD>Internal error, notify tech support
<TR><TH ALIGN="LEFT">XB_SEEK_ERROR<TD>Disk Error
<TR><TH ALIGN="LEFT">XB_READ_ERROR<TD>Disk Error
<TR><TH ALIGN="LEFT">XB_NO_ERROR<TD>No Error
</TABLE>
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/dumpdbt.cpp">dumpdbt.cpp</A> for
an example of how to use this method.
<hr>
<h3>Method xbLong xbDbf::GetMemoFieldLen( xbShort FieldNo )</h3><br>
This method returns the length of memo field FieldNo. FieldNo can be
retrieved by using method GetFieldNo.<br><br>
If successful, this method returns the length of the memo field in bytes.
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/dumpdbt.cpp">dumpdbt.cpp</A> for
an example of how to use this method.
<hr>
<h3>Method xbShort xbDbf::MemoFieldExists( xbShort FieldNo )</h3><br>
This method returns true (1) if field FieldNo has any memo data. Otherwise
it returns false (0).
<br><br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Method Return Codes</h3></CAPTION><br>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Return Code<TD>Description
<TR><TH ALIGN="LEFT">0<TD>Data file does not have any memo fields
<TR><TH ALIGN="LEFT">1<TD>Data file has memo fields
</TABLE>
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/dumpdbt.cpp">dumpdbt.cpp</A> for an
example of how to use this method.
<hr>
<h3>Method xbShort xbDbf::MemoFieldsPresent( void )</h3><br>
This method returns true (1) if the file has any memo fields. Otherwise
it returns false (0).
<br><br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Method Return Codes</h3></CAPTION><br>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Return Code<TD>Description
<TR><TH ALIGN="LEFT">0<TD>Data file does not have any memo fields
<TR><TH ALIGN="LEFT">1<TD>Data file has memo fields
</TABLE>
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/dumpdbt.cpp">dumpdbt.cpp</A> for an
example of how to use this method.
<hr>
<h3>Method xbShort xbDbf::PutxbDoubleField( char * FieldName, xbDouble d )</h3><br>
This method puts a xbDouble value d for field FieldName. If multiple accesses
for this particular field will be made from within the program, it is more
efficient to access the data utlizing the field's number.
<br><br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Method Return Codes</h3></CAPTION><br>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Return Code<TD>Description
<TR><TH ALIGN="LEFT">XB_INVALID_FIELDNO<TD>An invalid field number was used
<TR><TH ALIGN="LEFT">XB_INVALID_DATA<TD>Attempt to load invalid numeric or logical data
</TABLE>
<br><br><hr>
<h3>Method xbShort xbDbf::PutxbDoubleField( xbShort FieldNo, xbDouble d )</h3><br>
This method puts a xbDouble value d for field FieldNo.
<br><br>
<h3>Method Return Codes</h3>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Method Return Codes</h3></CAPTION><br>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Return Code<TD>Description
<TR><TH ALIGN="LEFT">XB_INVALID_FIELDNO<TD>An invalid field number was used
<TR><TH ALIGN="LEFT">XB_INVALID_DATA<TD>Attempt to load invalid numeric or logical data
</TABLE>
<br><br>
<hr>
<h3>Method xbShort xbDbf::PutField( xbShort FieldNo, char * buf )</h3><br>
This method fills field number FieldNo, with the data from buffer *buf.<br><br>
It copies data from *buf until a 0x00 character is encountered or the buffer
is filled. The field will be truncated if it is to long.<br><br>
Use method GetFieldNo to determine the value for FieldNo.<br><br>
If the field is type N or F, the field is loaded right justified, left blank
filled onto the record buffer.<br><br>
This method does check the validity of NUMERIC and LOGICAL data it is loading onto the
record buffer. Ther can be no spaces or non-numeric data for numeric fields.<br><br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Method Return Codes</h3></CAPTION><br>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Return Code<TD>Description
<TR><TH ALIGN="LEFT">XB_INVALID_FIELDNO<TD>An invalid field number was used
<TR><TH ALIGN="LEFT">XB_INVALID_DATA<TD>Attempt to load invalid numeric or logical data
</TABLE>
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/sample2.cpp">sample2.cpp</A> for an example
of how to use this method.
<hr>
<h3>Method xbShort xbDbf::PutFloatField( char * FieldName, FLOAT f )</h3><br>
This method puts a float value f for field FieldName. If multiple accesses
for this particular field will be made from within the program, it is more
efficient to access the data utlizing the field's number.
<br><br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Method Return Codes</h3></CAPTION><br>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Return Code<TD>Description
<TR><TH ALIGN="LEFT">XB_INVALID_FIELDNO<TD>An invalid field number was used
<TR><TH ALIGN="LEFT">XB_INVALID_DATA<TD>Attempt to load invalid numeric or logical data
</TABLE>
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/sample2.cpp">sample2.cpp</A> for an
example of how to use this method.
<hr>
<h3>Method xbShort xbDbf::PutFloatField( xbShort FieldNo, FLOAT f )</h3><br>
This method puts a float value f for field number FieldNo.
<br><br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Method Return Codes</h3></CAPTION><br>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Return Code<TD>Description
<TR><TH ALIGN="LEFT">XB_INVALID_FIELDNO<TD>An invalid field number was used
<TR><TH ALIGN="LEFT">XB_INVALID_DATA<TD>Attempt to load invalid numeric or logical data
</TABLE>
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/sample2.cpp">sample2.cpp</A> for an
example of how to use this method.
<hr>
<h3>Method xbLong xbDbf::PutLongField( char * FieldName, xbLong Val )</h3><br>
This method puts a long value Val for field FieldName. If multiple accesses
for this particular field will be made from within the program, it is more
efficient to access the data utlizing the field's number.
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/zips/zipinit.cpp">zipinit.cpp</A> for an
example of how to use this method.
<hr>
<h3>Method xbLong xbDbf::PutLongField( xbShort FieldNo, xbLong Val )</h3><br>
This method puts a long value Val for field FieldNo. FieldNo can be determined
by utilizing method GetFieldNo.
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/zips/zipinq.cpp">zipinq.cpp</A> for an
example of how to use this method.
<hr>
<h3>Method xbShort xbDbf::UpdateMemoData( xbShort FieldNo, xbLong len,
char * Buf, xbShort LockOption )</h3><br>
This method updates field <em>FieldNo</em> with <em>Len</em> bytes of
data from <em>Buf</em>.<br><br>
This is the only routine necessary to add, revise or delete memo field
data. To delete a memo field, set the length to zero (0L).<br><br>
<em>LockOption</em> is one of<br>
<li>F_SETLK - return immediately if lock fails
<li>F_SETLKW - wait until lock function executes
<br><br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Method Return Codes</h3></CAPTION><br>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Return Code<TD>Description
<TR><TH ALIGN="LEFT">XB_LOCK_FAILED<TD>Lock Failed
<TR><TH ALIGN="LEFT">XB_INVALID_BLOCK_NO<TD>Internal error, notify tech support
<TR><TH ALIGN="LEFT">XB_SEEK_ERROR<TD>Disk Error
<TR><TH ALIGN="LEFT">XB_READ_ERROR<TD>Disk Error
<TR><TH ALIGN="LEFT">XB_WRITE_ERROR<TD>Disk Error
<TR><TH ALIGN="LEFT">XB_NO_ERROR<TD>No Error
</TABLE>
<br><br>
<h4>Example Program:</h4>
See sample program <A HREF="/XbaseSamples/sample2.cpp">sample2.cpp</A> for
an example of how to use this method.
<hr>
<h3>Method xbShort xbDbf::ValidLogicalData( char * data )</h3><br>
This method returns true if <em>data</em> contains a valid logical data value.
Otherwise, it returns false.
<br><br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Method Return Codes</h3></CAPTION><br>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Return Code<TD>Description
<TR><TH ALIGN="LEFT">1<TD>Valid logical data
<TR><TH ALIGN="LEFT">0<TD>Invalid logical data
</TABLE>
<br>
<hr>
<h3>Method xbShort xbDbf::ValidNumericData( char * data )</h3><br>
This method returns true if <em>data</em> contains a valid numeric data value.
Otherwise, it returns false.
<br><br>
<TABLE BORDER>
<CAPTION ALIGN="TOP"><h3>Method Return Codes</h3></CAPTION><br>
<TR VALIGN="BASELINE">
<TR><TH ALIGN="LEFT">Return Code<TD>Description
<TR><TH ALIGN="LEFT">1<TD>Valid numeric data
<TR><TH ALIGN="LEFT">0<TD>Invalid numeric data
</TABLE>
<br>
<hr>
<p><img src="xbase.jpg"><br><hr>
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