home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Programming Languages Suite
/
ProgramD2.iso
/
Borland
/
Borland C++ V5.02
/
32SNIPIT.PAK
/
FIELDMAP.C
< prev
next >
Wrap
C/C++ Source or Header
|
1997-05-06
|
4KB
|
111 lines
// BDE32 3.x - (C) Copyright 1996 by Borland International
// fieldmap.c
#include "snipit.h"
static const char szTblName[] = "Vendors";
static const char szTblType[] = szPARADOX;
// Field descriptor used in mapping the fields of the table
static SNIPFAR FLDDesc FldDescs1[] = {
{
1, // Field number
"Vendor Name",// Field name
fldZSTRING, // Field type
fldUNKNOWN, // Field subtype
20, // Field size ( 1 or 0, except
// BLOb or CHAR field )
0, // Decimal places ( 0 )
// computed
0, // Offset in record ( 0 )
0, // Length in bytes ( 0 )
0, // For Null bits ( 0 )
fldvNOCHECKS, // Validity checks ( 0 )
fldrREADWRITE // Rights
},
{
2, "State/Prov", fldZSTRING, fldUNKNOWN,
20, 0, 0, 0, 0,
fldvNOCHECKS, fldrREADWRITE
}
}; // FldDescs1
//=====================================================================
// Function:
// TBFieldMap();
//
// Description:
// This example shows how to set a field map on a cursor. Field
// maps limit the number of fields that are visible to the user.
// This limits the data that needs to be transfered.
//=====================================================================
void
TBFieldMap (void)
{
hDBIDb hDb; // Handle to the database
hDBICur hCur; // Handle to the table
UINT16 uNumFields; // Number of fields in the mapping
UINT32 uNumRecs = 10; // Number of records to display
DBIResult rslt; // Return value from IDAPI functions
Screen("*** Field Mapping Example ***\r\n");
BREAK_IN_DEBUGGER();
Screen(" Initializing IDAPI... ");
if (InitAndConnect(&hDb) != DBIERR_NONE)
{
Screen("\r\n*** End of Example ***");
return;
}
Screen(" Setting the database directory...");
rslt = DbiSetDirectory(hDb, (pCHAR) szTblDirectory);
ChkRslt(rslt, "SetDirectory");
Screen(" Open the %s table....", szTblName);
rslt = DbiOpenTable(hDb, (pCHAR) szTblName, (pCHAR) szTblType,
NULL, NULL, 0, dbiREADWRITE, dbiOPENSHARED,
xltFIELD, FALSE, NULL, &hCur);
if (ChkRslt(rslt, "OpenTable") != DBIERR_NONE)
{
CloseDbAndExit(&hDb);
Screen("\r\n*** End of Example ***");
return;
}
Screen(" Change the fields that are visible in the table...");
// Determine the number of fields in the descriptor
uNumFields = sizeof(FldDescs1) / sizeof (FldDescs1[0]);
// Set the field mapping as specified in the field descriptor
rslt = DbiSetFieldMap(hCur, uNumFields, FldDescs1);
ChkRslt(rslt, "SetFieldMap");
rslt = DbiSetToBegin(hCur);
ChkRslt(rslt, "SetToBegin");
Screen(" Display the table with an active field map...");
DisplayTable(hCur, uNumRecs);
Screen("\r\n Remove all field mappings...");
rslt = DbiSetFieldMap(hCur, 0, 0);
ChkRslt(rslt, "SetFieldMap");
rslt = DbiSetToBegin(hCur);
ChkRslt(rslt, "SetToBegin");
Screen(" Display the table without any field mapping...");
DisplayTable(hCur, uNumRecs);
Screen("\r\n Close the %s table...", szTblName);
rslt = DbiCloseCursor(&hCur);
ChkRslt(rslt, "CloseCursor");
Screen(" Close the database and exit IDAPI...");
CloseDbAndExit(&hDb);
Screen("\r\n*** End of Example ***");
}