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/* xbdelete.cpp
XBase64 Software Library
Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
Email Contact:
XDB-devel@lists.sourceforge.net
XDB-users@lists.sourceforge.net
*/
#include "xbase.h"
#ifdef XB_SQL_SUPPORT
namespace xb{
/***********************************************************************/
xbInt16 xbSql::SqlDelete( const xbString &sCmdLine ){
// expected format:
// DELETE FROM tablename.DBF [WHERE expression]
xbInt16 iRc = 0;
xbInt16 iRc2 = 0;
xbInt16 iErrorStop = 0;
xbString sTableName = "";
xbUInt32 ulPos = 0;
xbString sCmd = sCmdLine;
xbString sNode = "";
xbString sFilter;
xbInt16 iDelOpt = 0;
xbString sTable;
xbDbf * dbf = NULL;
try{
// std::cout << "xbSql::SqlDelete( " << sCmdLine.Str() << " )\n";
sNode.ExtractElement( sCmd, ' ', 1, 0 );
sNode.Trim();
sNode.ToUpperCase();
if( sNode == "UNDELETE" )
iDelOpt = 1;
// pull off the action
sNode.ExtractElement( sCmd, ' ', 2, 0 );
sNode.Trim();
sNode.ToUpperCase();
if( sNode != "FROM" ){
iErrorStop = 100;
iRc = XB_SYNTAX_ERROR;
throw iRc;
}
// pull off the table name
sTable.ExtractElement( sCmd, ' ', 3, 0 );
sTable.Trim();
// pull off the "WHERE" statement if it exists
sNode.ExtractElement( sCmd, ' ', 4, 0 );
sNode.Trim();
sNode.ToUpperCase();
if( sNode == "WHERE" ){
ulPos = sCmd.Pos( "WHERE" );
sFilter = sCmd;
sFilter.Ltrunc( ulPos + 5 );
}
// if not open, attempt to open it
dbf = xbase->GetDbfPtr( sTable );
if( !dbf ){
if(( iRc = xbase->OpenHighestVersion( sTable, "", &dbf )) != XB_NO_ERROR ){
iErrorStop = 110;
throw iRc;
}
}
if( !dbf ){
iErrorStop = 120;
iRc = XB_DBF_FILE_NOT_OPEN;
throw iRc;
}
if( sFilter == "" ){
if(( iRc = dbf->DeleteAll( iDelOpt )) != XB_NO_ERROR ){
iErrorStop = 130;
throw iRc;
}
} else {
xbFilter f( dbf );
if(( iRc = f.Set( sFilter )) != XB_NO_ERROR ){
iErrorStop = 150;
throw iRc;
}
iRc2 = f.GetFirstRecord( XB_ALL_RECS );
while( iRc2 == XB_NO_ERROR ){
if( iDelOpt == 0 ){
if( !dbf->RecordDeleted()){
if(( iRc = dbf->DeleteRecord()) != XB_NO_ERROR ){
iErrorStop = 160;
throw iRc;
}
if(( iRc = dbf->Commit()) != XB_NO_ERROR ){
iErrorStop = 170;
throw iRc;
}
}
} else { // undelete
if( dbf->RecordDeleted()){
if(( iRc = dbf->UndeleteRecord()) != XB_NO_ERROR ){
iErrorStop = 180;
throw iRc;
}
if(( iRc = dbf->Commit()) != XB_NO_ERROR ){
iErrorStop = 190;
throw iRc;
}
}
}
iRc2 = f.GetNextRecord();
}
}
}
catch (xbInt16 iRc ){
xbString sMsg;
sMsg.Sprintf( "xbSql::SqlDelete() Exception Caught. Error Stop = [%d] rc = [%d] table = [%s]", iErrorStop, iRc, sTableName.Str() );
xbase->WriteLogMessage( sMsg.Str() );
xbase->WriteLogMessage( GetErrorMessage( iRc ));
}
return iRc;
}
/***********************************************************************/
} /* namespace */
#endif /* XB_SQL_SUPPORT */
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