The alxBase classes for work with DBF files

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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.