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/* xbdrpix.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{
#ifdef XB_INDEX_SUPPORT
/***********************************************************************/
xbInt16 xbSql::SqlDropIndex( const xbString &sCmdLine ){
// std::cout << "DROP INDEX [" << sCmdLine << "]\n";
// expected format:
// DROP INDEX [IF EXISTS] ixname.ndx ON tablename.dbf
xbInt16 iRc = 0;
xbInt16 iErrorStop = 0;
xbString sTableName;
xbString sIxName;
xbUInt32 ulPos;
xbString sCmd = sCmdLine;
xbString sNode;
xbBool bIfExists = xbFalse;
xbDbf * dbf = NULL;
try{
// drop off the first node "DROP"
ulPos = sCmd.Pos( ' ' );
sCmd.Ltrunc( ulPos );
sCmd.Ltrim();
// drop off the second node "INDEX"
ulPos = sCmd.Pos( ' ' );
sCmd.Ltrunc( ulPos );
sCmd.Ltrim();
sNode.ExtractElement( sCmd, ' ', 1, 0 );
sNode.Trim();
sNode.ToUpperCase();
if( sNode == "IF" ){
ulPos = sCmd.Pos( ' ' );
sCmd.Ltrunc( ulPos );
sCmd.Ltrim();
sNode.ExtractElement( sCmd, ' ', 1, 0 );
sNode.Trim();
sNode.ToUpperCase();
if( sNode != "EXISTS" ){
iErrorStop = 100;
iRc = XB_SYNTAX_ERROR;
throw iRc;
} else {
ulPos = sCmd.Pos( ' ' );
sCmd.Ltrunc( ulPos );
sCmd.Ltrim();
bIfExists = xbTrue;
}
}
// get the index name
sIxName.ExtractElement( sCmd, ' ', 1, 0 );
sIxName.Trim();
ulPos = sCmd.Pos( ' ' );
sCmd.Ltrunc( ulPos );
sCmd.Ltrim();
// go past "ON"
ulPos = sCmd.Pos( ' ' );
sCmd.Ltrunc( ulPos );
sCmd.Ltrim();
sTableName = sCmd;
sTableName.Trim();
xbFile fDbf( xbase );
fDbf.SetFileName( sTableName );
// if not open, attempt to open it
dbf = xbase->GetDbfPtr( fDbf.GetFqFileName());
if( !dbf ){
if(( iRc = xbase->OpenHighestVersion( sTableName, "", &dbf )) != XB_NO_ERROR ){
iErrorStop = 110;
throw iRc;
}
}
if( dbf == NULL ){
iErrorStop = 120;
iRc = XB_FILE_NOT_FOUND;
throw iRc;
}
#ifdef XB_LOCKING_SUPPORT
if(( iRc = dbf->LockTable( XB_LOCK )) != XB_NO_ERROR ){
iErrorStop = 130;
throw iRc;
}
#endif // XB_LOCKING_SUPPORT
ulPos = sIxName.Pos( ".NDX" );
if( ulPos > 0 ){
iRc = dbf->DeleteTag( "NDX", sIxName );
if( iRc == XB_FILE_NOT_FOUND && !bIfExists ){
iErrorStop = 140;
throw( iRc );
} else if( iRc != XB_NO_ERROR ){
iErrorStop = 150;
throw iRc;
}
} else { // assuming MDX tag
iRc = dbf->DeleteTag( "MDX", sIxName );
if( iRc == XB_FILE_NOT_FOUND && !bIfExists ){
iErrorStop = 160;
throw( iRc );
} else if( iRc != XB_NO_ERROR ){
iErrorStop = 170;
throw iRc;
}
}
}
catch (xbInt16 iRc ){
xbString sMsg;
sMsg.Sprintf( "xbSql::SqlDropIndex() Exception Caught. Error Stop = [%d] rc = [%d] table = [%s]", iErrorStop, iRc, sTableName.Str() );
xbase->WriteLogMessage( sMsg.Str() );
xbase->WriteLogMessage( GetErrorMessage( iRc ));
}
#ifdef XB_LOCKING_SUPPORT
dbf->LockTable( XB_UNLOCK );
#endif // XB_LOCKING_SUPPORT
return iRc;
}
#endif // XB_INDEX_SUPPORT
/***********************************************************************/
} /* namespace */
#endif /* XB_SQL_SUPPORT */
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