Initial revision

git-svn-id: https://svn.code.sf.net/p/flaim/code/trunk@621 0109f412-320b-0410-ab79-c3e0c5ffbbe6
2006-06-30 21:45:39 +00:00
parent 8c0b2ce402
commit fce94ee1f0
3 changed files with 677 additions and 0 deletions
--- a/sql/src/droptable.cpp
+++ b/sql/src/droptable.cpp
@@ -0,0 +1,215 @@
+//------------------------------------------------------------------------------
+// Desc:	This module contains routines that will drop an index.
+//
+// Tabs:	3
+//
+//		Copyright (c) 2006 Novell, Inc. All Rights Reserved.
+//
+//		This program is free software; you can redistribute it and/or
+//		modify it under the terms of version 2 of the GNU General Public
+//		License as published by the Free Software Foundation.
+//
+//		This program is distributed in the hope that it will be useful,
+//		but WITHOUT ANY WARRANTY; without even the implied warranty of
+//		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+//		GNU General Public License for more details.
+//
+//		You should have received a copy of the GNU General Public License
+//		along with this program; if not, contact Novell, Inc.
+//
+//		To contact Novell about this file by physical or electronic mail,
+//		you may find current contact information at www.novell.com
+//
+// $Id$
+//------------------------------------------------------------------------------
+
+#include "flaimsys.h"
+
+//------------------------------------------------------------------------------
+// Desc:	Drop a table.
+//------------------------------------------------------------------------------
+RCODE F_Db::dropTable(
+	FLMUINT				uiTableNum)
+{
+	RCODE					rc = NE_SFLM_OK;
+	F_TABLE *			pTable;
+	F_COLUMN *			pColumn;
+	FLMUINT				uiLoop;
+	FLMBOOL				bStartedTrans = FALSE;
+	
+	// Make sure we are in an update transaction.
+	
+	if (RC_BAD( rc = checkTransaction( SFLM_UPDATE_TRANS, &bStartedTrans)))
+	{
+		goto Exit;
+	}
+	
+	// Create a new dictionary, if we don't already have one.
+	
+	if (!(m_uiFlags & FDB_UPDATED_DICTIONARY))
+	{
+		if (RC_BAD( rc = dictClone()))
+		{
+			goto Exit;
+		}
+	}
+	
+	pTable = m_pDict->getTable( uiTableNum);
+	flmAssert( pTable);
+	
+	// Cannot drop internal system tables.
+	
+	if (pTable->bSystemTable)
+	{
+		rc = RC_SET( NE_SFLM_CANNOT_DROP_SYSTEM_TABLE);
+		goto Exit;
+	}
+	
+	// Delete the row for the table in the table table.
+	
+	if (RC_BAD( rc = deleteRow( SFLM_TBLNUM_TABLES,
+						pTable->ui64DefRowId, FALSE)))
+	{
+		goto Exit;
+	}
+	
+	// Delete all of the rows that define the table's columns
+	
+	for (pColumn = pTable->pColumns, uiLoop = 0;
+		  uiLoop < pTable->uiNumColumns;
+		  uiLoop++, pColumn++)
+	{
+		if (RC_BAD( rc = deleteRow( SFLM_TBLNUM_COLUMNS,
+							pColumn->ui64DefRowId, FALSE)))
+		{
+			goto Exit;
+		}
+	}
+	
+	// Initiate the background process to delete the b-tree.
+
+	if (RC_BAD( rc = m_pDatabase->lFileDelete( this, &pTable->lfInfo,
+												FALSE, TRUE)))
+	{
+		goto Exit;
+	}
+
+	// Remove the column name table.
+	
+	pTable->pColumnNames->Release();
+	pTable->pColumnNames = NULL;
+	
+	// Remove the table name from the table name table.
+	
+	m_pDict->m_pTableNames->removeName( pTable->pszTableName);
+
+	// Remove the table from the in-memory dictionary.  This is done
+	// simply by zeroing out the entire structure.
+	
+	f_memset( pTable, sizeof( F_TABLE), 0);
+	
+	// Log the operation
+	
+	if (RC_BAD( rc = m_pDatabase->m_pRfl->logDropTable( this, uiTableNum)))
+	{
+		goto Exit;
+	}
+	
+	// Commit the transaction if we started it
+	
+	if (bStartedTrans)
+	{
+		bStartedTrans = FALSE;
+		if (RC_BAD( rc = transCommit()))
+		{
+			goto Exit;
+		}
+	}
+
+Exit:
+
+	if (bStartedTrans)
+	{
+		transAbort();
+	}
+
+	return( rc);
+}
+
+//------------------------------------------------------------------------------
+// Desc:	Process the drop index statement.  The "DROP INDEX" keywords
+//			have already been parsed.
+//------------------------------------------------------------------------------
+RCODE SQLStatement::processDropTable( void)
+{
+	RCODE						rc = NE_SFLM_OK;
+	FLMBOOL					bStartedTrans = FALSE;
+	char						szTableName [MAX_SQL_NAME_LEN + 1];
+	FLMUINT					uiTableNameLen;
+	F_TABLE *				pTable;
+	
+	// If we are in a read transaction, we cannot do this operation
+	
+	if (RC_BAD( rc = m_pDb->checkTransaction( SFLM_UPDATE_TRANS, &bStartedTrans)))
+	{
+		goto Exit;
+	}
+
+	// SYNTAX: DROP INDEX <indexname> [ON <tablename>]
+	
+	// Whitespace must follow the "DROP INDEX"
+
+	if (RC_BAD( rc = skipWhitespace( TRUE)))
+	{
+		goto Exit;
+	}
+
+	// Get the table name - table name must exist
+	
+	if (RC_BAD( rc = getTableName( TRUE, szTableName, sizeof( szTableName),
+							&uiTableNameLen, &pTable)))
+	{
+		goto Exit;
+	}
+	
+	// Cannot drop system tables
+	
+	if (pTable->bSystemTable)
+	{
+		setErrInfo( m_uiCurrLineNum,
+				m_uiCurrLineOffset - 1,
+				SQL_ERR_CANNOT_DROP_SYSTEM_TABLE,
+				m_uiCurrLineFilePos,
+				m_uiCurrLineBytes);
+		rc = RC_SET( NE_SFLM_INVALID_SQL);
+		goto Exit;
+	}
+	
+	// Drop the table.
+
+	if (RC_BAD( rc = m_pDb->dropTable( pTable->uiTableNum)))
+	{
+		goto Exit;
+	}
+
+	// Commit the transaction if we started it
+	
+	if (bStartedTrans)
+	{
+		bStartedTrans = FALSE;
+		if (RC_BAD( rc = m_pDb->transCommit()))
+		{
+			goto Exit;
+		}
+	}
+
+Exit:
+
+	if (bStartedTrans)
+	{
+		m_pDb->transAbort();
+	}
+
+	return( rc);
+}
+