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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

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

 
GeneralRe: e:\temp\alxBASE\SRC\ALXParserFuncDef.cpp(1221): error C2666: ?pow? : 7 overloads have the similar conversion PinmemberDmitry Naumov21-Jan-04 21:14 
GeneralRe: e:\temp\alxBASE\SRC\ALXParserFuncDef.cpp(1221): error C2666: ?pow? : 7 overloads have the similar conversion Pinmemberm0xx22-Jun-04 21:57 
GeneralRe: e:\temp\alxBASE\SRC\ALXParserFuncDef.cpp(1221): error C2666: ?pow? : 7 overloads have the similar conversion Pinmembershaunwerkhoven28-Sep-04 0:15 
GeneralRe: e:\temp\alxBASE\SRC\ALXParserFuncDef.cpp(1221): error C2666: ?pow? : 7 overloads have the similar conversion PinsussGanjoo11-Oct-04 4:00 
GeneralRe: e:\temp\alxBASE\SRC\ALXParserFuncDef.cpp(1221): error C2666: ?pow? : 7 overloads have the similar conversion PinmemberAnthony_Yio17-May-05 23:11 
GeneralHelp, I'm a newbie Pinmemberarktow6-Nov-03 8:06 
GeneralRe: Help, I'm a newbie PinmemberAlexey9-Nov-03 19:53 
GeneralAssertion Failed! Pinmemberdade8888817-Oct-03 0:20 
Thanks for the previous reply!
Now i got another problem....
 
recompiling the lib i solved the vc60.pcb error but when i try to open a dbf
with the following function
 
CDBFRecordset* m_pSet;
 
m_pSet->Open("C:\\1.DBF");
 

Debug Assertion Failed!
 
in ..\\AlexBase\Src\DbfRecordset.cpp
Line:248
 
am i doing something wrong??
GeneralRe: Assertion Failed! PinmemberAlexey17-Oct-03 3:02 
GeneralVC60.pdb Pinmemberdade8888816-Oct-03 22:01 
GeneralRe: VC60.pdb PinmemberAlexey16-Oct-03 23:36 
GeneralRe: VC60.pdb PinmemberKarstenK17-Oct-03 0:18 
Generaldata not updated in DBFMemCursor Pinsussliyuncheng5-Oct-03 17:23 
GeneralRe: data not updated in DBFMemCursor Pinsussliyuncheng5-Oct-03 17:27 
GeneralSource for other apps - DBFNavigator, NTXFiew, etc. Pinmemberdrpc26-Jul-03 1:46 
GeneralRe: Source for other apps - DBFNavigator, NTXFiew, etc. PinsussAnonymous27-Jul-03 19:49 
GeneralUpdating table structure of 1 file from another. PinsussAnonymous21-Jul-03 7:30 
GeneralRe: Updating table structure of 1 file from another. PinmemberAlexey21-Jul-03 19:15 
GeneralRe: Updating table structure of 1 file from another. PinsussAnonymous23-Jul-03 9:40 
GeneralOracle Export to DBF PinmemberHamed Abnagar19-Jul-03 17:12 
QuestionHow to create a datetime field and what format is the datetime for input? Pinmemberliyuncheng17-Jul-03 16:40 
AnswerRe: How to create a datetime field and what format is the datetime for input? PinmemberAlexey17-Jul-03 19:15 
QuestionHow to pack deleted record? Pinmemberliyuncheng14-Jul-03 16:21 
AnswerRe: How to pack deleted record? PinmemberAlexey14-Jul-03 19:22 
Generalsort a dbf Pinmemberbtorrey10-Jun-03 13:18 

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