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The alxBase classes for work with DBF files

, 5 Nov 2002
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The alxBase classes for work with dbf files.

Introduction

This classes is useful for work with dbf files. The current version supports formats: FoxPro, Visual FoxPro, dBASEIII - dBASE 5.x, Clipper and HiPer-SIx. The memo fields also are supported. CDBFRecordset provides all the useful functions for navigation and modification in table. CDBFCursorset it is possible to use for work only with the selected records. CDBFTableDef it is used for creation and updating of structure of the table.

Create/Update table structure

For creation/updating of structure of the table are available functions:

    <li><code>CreateTable
  • ModifyTable
  • AddField
  • InsertField
  • ModifyField
  • MoveField
  • DeleteField
  • UpdateTable

For cancels any pending updates you may call function CanselUpdateTable().

try
{
	CDBFTableDef mNewTable;
	// begin create
	mNewTable.CreateTable(szFileName);

	// add field
	FIELD_REC FieldRec;
	memset(&FieldRec, 0, sizeof(FIELD_REC));
	memcpy(FieldRec.field_name, szFieldName, 10);
	FieldRec.field_type = FLD_TYPE_CHARACTER;
	FieldRec.len_info.char_len = 20;
	mNewTable.AddField(&FieldRec);

	// ...

	// end create
	mNewTable.UpdateTable();
}
catch(CDBFException* e)
{
	e->ReportError();
	e->Delete();
}

Navigation

For navigation are supported functions:

    <li><code>Move
  • MoveNext
  • MovePrev
  • MoveFirst
  • MoveLast
  • SetAbsolutePosition

You also may use functions: IsEOF(), IsBOF(), GetRecordCount(), GetAbsolutePosition().

try
{
	CDBFRecordset m_Set;
	m_Set.Open("test.dbf");
	while(!m_Set.IsEOF())
	{
		// ...
		m_Set.MoveNext();
	}
}
catch(CDBFException* e)
{
	e->ReportError();
	e->Delete();
}

Append/Edit record

For addition, changes of record are functions:

    <li><code>AddNew
  • Edit
  • SetFieldValue
  • Delete
  • Undelete
  • Update

You also may use functions: LockRecord(), UnlockRecord(), GetFieldvalue().

try
{
	m_Set.Edit();
	m_Set.SetFieldValue("Key",varKey);
	m_Set.SetFieldValue("NAME",varName);
	m_Set.SetFieldValue("PHONE",varPhone);
	m_Set.Update();
}
catch(CDBFException* e)
{
	e->ReportError();
	e->Delete();
}

Find Functions

For find are supported functions:

    <li><code>FindFirst
  • FindNext
  • FindLast
  • FindPrev
try
{
	BOOL bFind = m_Set.FindFirst("LIKE('*Club*', NAME)");
	while(bFind)
	{
		// ...
		bFind = m_Set.FindNext();
	}
}
catch(CDBFException* e)
{
	e->ReportError();
	e->Delete();
}

Parameter of functions: FindFirst(), FindLast(), ... string expression of dBASE language.

Filter

For the filter SetFilter function is used:

    <li><code>SetFilter
try
{
	m_Set.SetFilter("LIKE('*Club*', NAME)");
	m_Set.Requery()
	// ...
}
catch(CDBFException* e)
{
	e->ReportError();
	e->Delete();
}

This function is supported only in classes CDBFCursorset and CDBFMemCursorset.

DBFView Demo

This sample shows some opportunities of library alxBASE.

More information about the product can be found at http://www.alxsoft.narod.ru.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

Alexey
Web Developer
Russian Federation Russian Federation
Year of birth - 1974.
Eeducation - was ended by Kaliningrad State University in 1997.
Now I work as the engineer-programmer in Kaliningrad (RUSSIA).

Comments and Discussions

 
QuestionAssertion Failed! PinmemberGoa3-Jul-07 8:36 
AnswerRe: Assertion Failed! PinmemberGoa4-Jul-07 6:18 
QuestionalxBase without mfc Pinmemberjoviens19-Dec-06 6:44 
AnswerRe: alxBase without mfc PinmemberS Mario26-Oct-09 19:08 
Generalfield content PinmemberJoao Araujo21-Jan-06 16:51 
GeneralDelete records Pinmemberpgiustinoni7-Jul-05 7:49 
GeneralGood work But... Pinmemberali TEKE11-Apr-05 4:37 
GeneralProblem in adding new records PinmemberMr.V.Stephen30-Jan-05 0:04 
GeneralRe: Problem in adding new records PinmemberEndlessWinter10-Feb-05 17:18 
GeneralIts really a very nice project Pinmembervstephen200222-Jan-05 0:37 
GeneralUsing the FindFirst function PinmemberAlex Evans1-Nov-04 12:14 
GeneralRe: Using the FindFirst function PinmemberEndlessWinter10-Feb-05 17:23 
GeneralConverted library for Windos CE PinmemberAlex Evans2-Oct-04 22:53 
GeneralUsing this with Windows CE PinmemberAlex Evans1-Oct-04 21:51 
GenerallockRecord() Pinmemberthangoftin29-Aug-04 19:18 
GeneralUsing the FindFirst function PinmemberAlex Evans1-Nov-04 12:17 
QuestionHow can i insert/update/delete image file? PinmemberMr.Ahn7-Jul-04 2:21 
QuestionHow to pack deleted record Pinmembersimranjeet11-Jun-04 4:08 
AnswerRe: How to pack deleted record PinmemberAlexey14-Jun-04 20:28 
QuestionHow to pack deleted record Pinsusssimranjit11-Jun-04 4:02 
QuestionSample db files? Pinmemberchenhuisheng13-Apr-04 16:21 
GeneralGreat!! - one question Pinmemberbdiamond29-Mar-04 4:30 
I was having problems with your classes a few days ago, so I stopped using them and opted to use ODBC functions instead to do multiple inserts. The problem was my own because I compiled a debug version of the .lib file and it was conflicting with the release version of my DLL. Now that I took care of that, everything is working great! SetFieldValue() is working about 100 times faster than using ODBC was!! But while I was using ODBC my boss asked me if I could make it also export to Excel, which was also easily done, but slow. Since I'm back using your classes now I'd like to know if you know if there's a way I can derive from your dbfrecordset class with the correct offset in the header fields to do the same thing with an .xls file? Any help would be greatly appreciated. I'm giving your article a rating of 5, by the way!
 
If it's broken, I probably did it
 
bdiamond
GeneralRe: Great!! - one question PinmemberAlexey29-Mar-04 19:33 
Generalcan't write header info correctly Pinmemberbdiamond18-Mar-04 8:10 
GeneralRe: can't write header info correctly PinmemberAlexey18-Mar-04 20:42 

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