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swad-core/swad_program_resource.c

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// swad_program_resource.c: course program (resources)
/*
SWAD (Shared Workspace At a Distance),
is a web platform developed at the University of Granada (Spain),
and used to support university teaching.
This file is part of SWAD core.
Copyright (C) 1999-2021 Antonio Cañas Vargas
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*****************************************************************************/
/********************************* Headers ***********************************/
/*****************************************************************************/
#include "swad_error.h"
#include "swad_form.h"
#include "swad_global.h"
#include "swad_program.h"
#include "swad_program_database.h"
#include "swad_program_resource.h"
/*****************************************************************************/
/************** External global variables from others modules ****************/
/*****************************************************************************/
extern struct Globals Gbl;
/*****************************************************************************/
/******************************* Private types *******************************/
/*****************************************************************************/
#define PrgRsc_NUM_MOVEMENTS_UP_DOWN 2
typedef enum
{
PrgRsc_MOVE_UP,
PrgRsc_MOVE_DOWN,
} PrgRsc_MoveUpDown_t;
/*****************************************************************************/
/***************************** Private variables *****************************/
/*****************************************************************************/
static long PrgSrc_RscCodToBeRemoved = -1L;
static const char *PrgRsc_RESOURCE_SECTION_ID = "rsc_section";
/*****************************************************************************/
/***************************** Private prototypes ****************************/
/*****************************************************************************/
static void PrgRsc_PutIconsViewResources (void *ItmCod);
static void PrgRsc_PutIconsEditResources (void *ItmCod);
static void PrgSrc_PutIconToViewResources (long ItmCod);
static void PrgSrc_PutIconToEditResources (long ItmCod);
static void PrgRsc_GetDataOfResourceByCod (struct PrgRsc_Resource *Resource);
static void PrgRsc_GetDataOfResource (struct PrgRsc_Resource *Resource,
MYSQL_RES **mysql_res);
static void PrgRsc_ResetResource (struct PrgRsc_Resource *Resource);
static void PrgRsc_WriteRowViewResource (unsigned NumRsc,
struct PrgRsc_Resource *Resource);
static void PrgRsc_WriteRowEditResource (unsigned NumRsc,unsigned NumResources,
struct PrgRsc_Resource *Resource);
static void PrgRsc_PutFormsToRemEditOneResource (unsigned NumRsc,
unsigned NumResources,
struct PrgRsc_Resource *Resource);
static void PrgRsc_PutParams (void *RscCod);
static void PrgRsc_PutParamRscCod (long RscCod);
static long PrgRsc_GetParamRscCod (void);
static void PrgRsc_HideOrUnhideResource (bool Hide);
static void PrgRsc_MoveUpDownResource (PrgRsc_MoveUpDown_t UpDown);
static bool PrgRsc_ExchangeResources (const struct PrgRsc_Rsc *Rsc1,
const struct PrgRsc_Rsc *Rsc2);
/*****************************************************************************/
/****************************** View resources *******************************/
/*****************************************************************************/
void PrgRsc_ViewResources (void)
{
long ItmCod;
unsigned FormLevel;
struct Prg_ItemRange ToHighlight;
/***** Get list of program items *****/
Prg_GetListItems ();
/***** Get the code of the program item *****/
if ((ItmCod = Prg_GetParamItmCod ()) > 0)
FormLevel = Prg_GetLevelFromNumItem (Prg_GetNumItemFromItmCod (ItmCod));
else
FormLevel = 0;
/***** Show current program items, if any *****/
Prg_SetItemRangeEmpty (&ToHighlight);
Prg_ShowAllItems (Prg_END_EDIT_RES,
&ToHighlight,-1L,ItmCod,FormLevel);
/***** Free list of program items *****/
Prg_FreeListItems ();
}
/*****************************************************************************/
/****************************** Edit resources *******************************/
/*****************************************************************************/
void PrgRsc_EditResources (void)
{
long ItmCod;
unsigned FormLevel;
struct Prg_ItemRange ToHighlight;
/***** Get list of program items *****/
Prg_GetListItems ();
/***** Get the code of the program item *****/
if ((ItmCod = Prg_GetParamItmCod ()) > 0)
FormLevel = Prg_GetLevelFromNumItem (Prg_GetNumItemFromItmCod (ItmCod));
else
FormLevel = 0;
/***** Show current program items, if any *****/
Prg_SetItemRangeEmpty (&ToHighlight);
Prg_ShowAllItems (Prg_EDIT_RESOURCES,
&ToHighlight,-1L,ItmCod,FormLevel);
/***** Free list of program items *****/
Prg_FreeListItems ();
}
/*****************************************************************************/
/****************************** List resources *******************************/
/*****************************************************************************/
void PrgRsc_ListItemResources (Prg_ListingItem_t ListingItem,long ItmCod)
{
extern const char *Hlp_COURSE_Program;
extern const char *Txt_Remove_resource;
extern const char *Txt_Resources;
MYSQL_RES *mysql_res;
unsigned NumRsc;
unsigned NumResources;
struct PrgRsc_Resource Resource;
static bool GetHiddenResources[Prg_NUM_LISTING_ITEM_TYPES] =
{
[Prg_PRINT ] = false,
[Prg_VIEW ] = false,
[Prg_EDIT_LIST ] = false,
[Prg_NEW_ITEM ] = false,
[Prg_EDIT_ITEM ] = false,
[Prg_EDIT_RESOURCES] = true,
[Prg_END_EDIT_RES ] = false,
};
static bool FeaturedList[Prg_NUM_LISTING_ITEM_TYPES] =
{
[Prg_PRINT ] = false,
[Prg_VIEW ] = false,
[Prg_EDIT_LIST ] = false,
[Prg_NEW_ITEM ] = false,
[Prg_EDIT_ITEM ] = false,
[Prg_EDIT_RESOURCES] = true,
[Prg_END_EDIT_RES ] = true,
};
/***** Trivial check *****/
if (ItmCod <= 0)
return;
/***** Get list of item resources from database *****/
NumResources = Prg_DB_GetListResources (&mysql_res,ItmCod,
GetHiddenResources[ListingItem]);
/***** Begin section *****/
if (FeaturedList[ListingItem])
HTM_SECTION_Begin (PrgRsc_RESOURCE_SECTION_ID);
/***** Show possible alerts *****/
if (FeaturedList[ListingItem])
switch (Gbl.Action.Act)
{
case ActReqRemPrgRsc:
/* Alert with button to remove resource */
Ale_ShowLastAlertAndButton (ActRemPrgRsc,PrgRsc_RESOURCE_SECTION_ID,NULL,
PrgRsc_PutParams,&PrgSrc_RscCodToBeRemoved,
Btn_REMOVE_BUTTON,Txt_Remove_resource);
break;
default:
Ale_ShowAlerts (PrgRsc_RESOURCE_SECTION_ID);
break;
}
/***** Begin box *****/
switch (ListingItem)
{
case Prg_EDIT_LIST:
case Prg_NEW_ITEM:
case Prg_EDIT_ITEM:
case Prg_END_EDIT_RES:
Box_BoxBegin ("100%",Txt_Resources,
PrgRsc_PutIconsEditResources,&ItmCod,
Hlp_COURSE_Program,Box_NOT_CLOSABLE);
break;
case Prg_EDIT_RESOURCES:
Box_BoxBegin ("100%",Txt_Resources,
PrgRsc_PutIconsViewResources,&ItmCod,
Hlp_COURSE_Program,Box_NOT_CLOSABLE);
break;
default:
Box_BoxBegin ("100%",Txt_Resources,
NULL,NULL,
Hlp_COURSE_Program,Box_NOT_CLOSABLE);
break;
}
/***** Table *****/
HTM_TABLE_BeginWideMarginPadding (2);
HTM_TBODY_Begin (NULL);
/***** Write all item resources *****/
for (NumRsc = 0;
NumRsc < NumResources;
NumRsc++)
{
/* Get data of this item resource */
PrgRsc_GetDataOfResource (&Resource,&mysql_res);
/* Show item */
switch (ListingItem)
{
case Prg_EDIT_RESOURCES:
PrgRsc_WriteRowEditResource (NumRsc,NumResources,&Resource);
break;
default:
PrgRsc_WriteRowViewResource (NumRsc,&Resource);
break;
}
The_ChangeRowColor ();
}
/***** End table *****/
HTM_TBODY_End ();
HTM_TABLE_End ();
/***** End box *****/
Box_BoxEnd ();
/***** End section *****/
if (FeaturedList[ListingItem])
HTM_SECTION_End ();
}
/*****************************************************************************/
/************** Put contextual icons in list of item resources ***************/
/*****************************************************************************/
static void PrgRsc_PutIconsViewResources (void *ItmCod)
{
/***** Put icon to create a new item resource *****/
if (ItmCod)
if (*((long *) ItmCod) > 0)
if (Prg_CheckIfICanCreateItems ())
PrgSrc_PutIconToViewResources (*((long *) ItmCod));
}
static void PrgRsc_PutIconsEditResources (void *ItmCod)
{
/***** Put icon to create a new item resource *****/
if (ItmCod)
if (*((long *) ItmCod) > 0)
if (Prg_CheckIfICanCreateItems ())
PrgSrc_PutIconToEditResources (*((long *) ItmCod));
}
/*****************************************************************************/
/********************* Put icon to edit item resources ***********************/
/*****************************************************************************/
static void PrgSrc_PutIconToViewResources (long ItmCod)
{
Ico_PutContextualIconToView (ActFrmSeePrgRsc,PrgRsc_RESOURCE_SECTION_ID,
Prg_PutParams,&ItmCod);
}
static void PrgSrc_PutIconToEditResources (long ItmCod)
{
Ico_PutContextualIconToEdit (ActFrmEdiPrgRsc,PrgRsc_RESOURCE_SECTION_ID,
Prg_PutParams,&ItmCod);
}
/*****************************************************************************/
/****************** Get item resource data using its code ********************/
/*****************************************************************************/
static void PrgRsc_GetDataOfResourceByCod (struct PrgRsc_Resource *Resource)
{
MYSQL_RES *mysql_res;
if (Resource->Rsc.Cod > 0)
{
/***** Get data of item resource *****/
if (Prg_DB_GetDataOfResourceByCod (&mysql_res,Resource->Rsc.Cod))
PrgRsc_GetDataOfResource (Resource,&mysql_res);
else
PrgRsc_ResetResource (Resource);
/***** Free structure that stores the query result *****/
DB_FreeMySQLResult (&mysql_res);
}
else
/***** Clear all item resource data *****/
PrgRsc_ResetResource (Resource);
}
/*****************************************************************************/
/************************* Get item resource data ****************************/
/*****************************************************************************/
static void PrgRsc_GetDataOfResource (struct PrgRsc_Resource *Resource,
MYSQL_RES **mysql_res)
{
MYSQL_ROW row;
/***** Get data of item resource from database *****/
/* Get row */
row = mysql_fetch_row (*mysql_res);
/*
ItmCod row[0]
RscCod row[1]
RscInd row[2]
Hidden row[3]
Title row[4]
*/
/* Get code of the program item (row[0]) */
Resource->ItmCod = Str_ConvertStrCodToLongCod (row[0]);
/* Get code and index of the item resource (row[1], row[2]) */
Resource->Rsc.Cod = Str_ConvertStrCodToLongCod (row[1]);
Resource->Rsc.Ind = Str_ConvertStrToUnsigned (row[2]);
/* Get whether the program item is hidden (row(3)) */
Resource->Hidden = (row[3][0] == 'Y');
/* Get the title of the item resource (row[4]) */
Str_Copy (Resource->Title,row[4],sizeof (Resource->Title) - 1);
}
/*****************************************************************************/
/************************ Clear all item resource data ***********************/
/*****************************************************************************/
static void PrgRsc_ResetResource (struct PrgRsc_Resource *Resource)
{
Resource->ItmCod = -1L;
Resource->Rsc.Cod = -1L;
Resource->Rsc.Ind = 0;
Resource->Hidden = false;
Resource->Title[0] = '\0';
}
/*****************************************************************************/
/************************** Show one item resource ***************************/
/*****************************************************************************/
static void PrgRsc_WriteRowViewResource (unsigned NumRsc,
struct PrgRsc_Resource *Resource)
{
/***** Begin row *****/
HTM_TR_Begin (NULL);
/***** Resource number *****/
HTM_TD_Begin ("class=\"PRG_NUM PRG_RSC_%s RT %s\"",
The_GetSuffix (),The_GetColorRows ());
HTM_Unsigned (NumRsc + 1);
HTM_TD_End ();
/***** Title *****/
HTM_TD_Begin ("class=\"PRG_MAIN PRG_RSC_%s %s\"",
The_GetSuffix (),The_GetColorRows ());
HTM_Txt (Resource->Title);
HTM_TD_End ();
/***** End row *****/
HTM_TR_End ();
}
/*****************************************************************************/
/************************** Edit one item resource ***************************/
/*****************************************************************************/
static void PrgRsc_WriteRowEditResource (unsigned NumRsc,unsigned NumResources,
struct PrgRsc_Resource *Resource)
{
/***** Begin row *****/
HTM_TR_Begin (NULL);
/***** Forms to remove/edit this item resource *****/
HTM_TD_Begin ("class=\"PRG_COL1 LT %s\"",The_GetColorRows ());
PrgRsc_PutFormsToRemEditOneResource (NumRsc,NumResources,Resource);
HTM_TD_End ();
/***** Resource number *****/
HTM_TD_Begin ("class=\"PRG_NUM PRG_RSC_%s RT %s\"",
The_GetSuffix (),The_GetColorRows ());
HTM_Unsigned (NumRsc + 1);
HTM_TD_End ();
/***** Title *****/
HTM_TD_Begin ("class=\"PRG_MAIN PRG_RSC_%s %s\"",
The_GetSuffix (),The_GetColorRows ());
HTM_Txt (Resource->Title);
HTM_TD_End ();
/***** End row *****/
HTM_TR_End ();
}
/*****************************************************************************/
/**************** Put a link (form) to edit one program item *****************/
/*****************************************************************************/
static void PrgRsc_PutFormsToRemEditOneResource (unsigned NumRsc,
unsigned NumResources,
struct PrgRsc_Resource *Resource)
{
extern const char *Txt_Movement_not_allowed;
switch (Gbl.Usrs.Me.Role.Logged)
{
case Rol_TCH:
case Rol_SYS_ADM:
/***** Put form to remove item resource *****/
Ico_PutContextualIconToRemove (ActReqRemPrgRsc,PrgRsc_RESOURCE_SECTION_ID,
PrgRsc_PutParams,&Resource->Rsc.Cod);
/***** Put form to hide/show item resource *****/
if (Resource->Hidden)
Ico_PutContextualIconToUnhide (ActUnhPrgRsc,PrgRsc_RESOURCE_SECTION_ID,
PrgRsc_PutParams,&Resource->Rsc.Cod);
else
Ico_PutContextualIconToHide (ActHidPrgRsc,PrgRsc_RESOURCE_SECTION_ID,
PrgRsc_PutParams,&Resource->Rsc.Cod);
/***** Put form to edit program item *****/
// Ico_PutContextualIconToEdit (ActFrmChgPrgItm,"item_form",
// Prg_PutParams,&Item->Hierarchy.ItmCod);
/***** Put form to add a new child item inside this item *****/
// Ico_PutContextualIconToAdd (ActFrmNewPrgItm,"item_form",
// Prg_PutParams,&Item->Hierarchy.ItmCod);
/***** Put icon to move up the item *****/
if (NumRsc > 0)
Lay_PutContextualLinkOnlyIcon (ActUp_PrgRsc,PrgRsc_RESOURCE_SECTION_ID,
PrgRsc_PutParams,&Resource->Rsc.Cod,
"arrow-up.svg",Ico_BLACK);
else
Ico_PutIconOff ("arrow-up.svg",Ico_BLACK,Txt_Movement_not_allowed);
/***** Put icon to move down the item *****/
if (NumRsc < NumResources - 1)
Lay_PutContextualLinkOnlyIcon (ActDwnPrgRsc,PrgRsc_RESOURCE_SECTION_ID,
PrgRsc_PutParams,&Resource->Rsc.Cod,
"arrow-down.svg",Ico_BLACK);
else
Ico_PutIconOff ("arrow-down.svg",Ico_BLACK,Txt_Movement_not_allowed);
break;
case Rol_STD:
case Rol_NET:
break;
default:
break;
}
}
/*****************************************************************************/
/******************** Params used to edit a program item *********************/
/*****************************************************************************/
static void PrgRsc_PutParams (void *RscCod)
{
if (RscCod)
if (*((long *) RscCod) > 0)
PrgRsc_PutParamRscCod (*((long *) RscCod));
}
/*****************************************************************************/
/**************** Write parameter with code of program item ******************/
/*****************************************************************************/
static void PrgRsc_PutParamRscCod (long RscCod)
{
Par_PutHiddenParamLong (NULL,"RscCod",RscCod);
}
/*****************************************************************************/
/***************** Get parameter with code of item resource ******************/
/*****************************************************************************/
static long PrgRsc_GetParamRscCod (void)
{
return Par_GetParToLong ("RscCod");
}
/*****************************************************************************/
/************ Ask for confirmation of removing an item resource **************/
/*****************************************************************************/
void PrgRsc_ReqRemResource (void)
{
extern const char *Txt_Do_you_really_want_to_remove_the_resource_X;
struct PrgRsc_Resource Resource;
long ItmCod;
unsigned FormLevel;
struct Prg_ItemRange ToHighlight;
/***** Get list of program items *****/
Prg_GetListItems ();
/***** Get data of the item resource from database *****/
Resource.Rsc.Cod = PrgRsc_GetParamRscCod ();
PrgRsc_GetDataOfResourceByCod (&Resource);
if (Resource.ItmCod <= 0)
Err_WrongResourceExit ();
/***** Create alert to remove the item resource *****/
Ale_CreateAlert (Ale_QUESTION,PrgRsc_RESOURCE_SECTION_ID,
Txt_Do_you_really_want_to_remove_the_resource_X,
Resource.Title);
PrgSrc_RscCodToBeRemoved = Resource.Rsc.Cod;
/***** Get the code of the program item *****/
ItmCod = Resource.ItmCod;
FormLevel = Prg_GetLevelFromNumItem (Prg_GetNumItemFromItmCod (Resource.ItmCod));
/***** Show current program items, if any *****/
Prg_SetItemRangeEmpty (&ToHighlight);
Prg_ShowAllItems (Prg_EDIT_RESOURCES,
&ToHighlight,-1L,ItmCod,FormLevel);
/***** Free list of program items *****/
Prg_FreeListItems ();
}
/*****************************************************************************/
/**************************** Remove an item resource ************************/
/*****************************************************************************/
void PrgRsc_RemoveResource (void)
{
extern const char *Txt_Resource_X_removed;
struct PrgRsc_Resource Resource;
long ItmCod;
unsigned FormLevel;
struct Prg_ItemRange ToHighlight;
/***** Get list of program items *****/
Prg_GetListItems ();
/***** Get data of the item resource from database *****/
Resource.Rsc.Cod = PrgRsc_GetParamRscCod ();
PrgRsc_GetDataOfResourceByCod (&Resource);
if (Resource.ItmCod <= 0)
Err_WrongResourceExit ();
/***** Remove resource *****/
Prg_DB_RemoveResource (&Resource);
/***** Create alert to remove the item resource *****/
Ale_CreateAlert (Ale_SUCCESS,PrgRsc_RESOURCE_SECTION_ID,
Txt_Resource_X_removed,Resource.Title);
/***** Get the code of the program item *****/
ItmCod = Resource.ItmCod;
FormLevel = Prg_GetLevelFromNumItem (Prg_GetNumItemFromItmCod (Resource.ItmCod));
/***** Show current program items, if any *****/
Prg_SetItemRangeEmpty (&ToHighlight);
Prg_ShowAllItems (Prg_EDIT_RESOURCES,
&ToHighlight,-1L,ItmCod,FormLevel);
/***** Free list of program items *****/
Prg_FreeListItems ();
}
/*****************************************************************************/
/***************************** Hide a program item ***************************/
/*****************************************************************************/
void PrgRsc_HideResource (void)
{
PrgRsc_HideOrUnhideResource (true);
}
void PrgRsc_UnhideResource (void)
{
PrgRsc_HideOrUnhideResource (false);
}
static void PrgRsc_HideOrUnhideResource (bool Hide)
{
struct PrgRsc_Resource Resource;
long ItmCod;
unsigned FormLevel;
struct Prg_ItemRange ToHighlight;
/***** Get list of program items *****/
Prg_GetListItems ();
/***** Get data of the item resource from database *****/
Resource.Rsc.Cod = PrgRsc_GetParamRscCod ();
PrgRsc_GetDataOfResourceByCod (&Resource);
if (Resource.ItmCod <= 0)
Err_WrongResourceExit ();
/***** Hide/unhide item resource *****/
Prg_DB_HideOrUnhideResource (Resource.Rsc.Cod,Hide);
/***** Get the code of the program item *****/
ItmCod = Resource.ItmCod;
FormLevel = Prg_GetLevelFromNumItem (Prg_GetNumItemFromItmCod (Resource.ItmCod));
/***** Show current program items, if any *****/
Prg_SetItemRangeEmpty (&ToHighlight);
Prg_ShowAllItems (Prg_EDIT_RESOURCES,
&ToHighlight,-1L,ItmCod,FormLevel);
/***** Free list of program items *****/
Prg_FreeListItems ();
}
/*****************************************************************************/
/**************************** Move up/down resource **************************/
/*****************************************************************************/
void PrgRsc_MoveUpResource (void)
{
PrgRsc_MoveUpDownResource (PrgRsc_MOVE_UP);
}
void PrgRsc_MoveDownResource (void)
{
PrgRsc_MoveUpDownResource (PrgRsc_MOVE_DOWN);
}
static void PrgRsc_MoveUpDownResource (PrgRsc_MoveUpDown_t UpDown)
{
extern const char *Txt_Movement_not_allowed;
struct PrgRsc_Resource Resource;
struct PrgRsc_Rsc Rsc2;
long ItmCod;
unsigned FormLevel;
struct Prg_ItemRange ToHighlight;
bool Success = false;
static unsigned (*GetOtherRscInd[PrgRsc_NUM_MOVEMENTS_UP_DOWN])(long ItmCod,unsigned RscInd) =
{
[PrgRsc_MOVE_UP ] = Prg_DB_GetRscIndBefore,
[PrgRsc_MOVE_DOWN] = Prg_DB_GetRscIndAfter,
};
/***** Get list of program items *****/
Prg_GetListItems ();
/***** Get data of the item resource from database *****/
Resource.Rsc.Cod = PrgRsc_GetParamRscCod ();
PrgRsc_GetDataOfResourceByCod (&Resource);
if (Resource.ItmCod <= 0)
Err_WrongResourceExit ();
/***** Move up/down resource *****/
if ((Rsc2.Ind = GetOtherRscInd[UpDown] (Resource.ItmCod,Resource.Rsc.Ind))) // 0 ==> movement not allowed
{
/* Get the other resource code */
Rsc2.Cod = Prg_DB_GetRscCodFromRscInd (Resource.ItmCod,Rsc2.Ind);
/* Exchange subtrees */
Success = PrgRsc_ExchangeResources (&Resource.Rsc,&Rsc2);
}
if (!Success)
Ale_ShowAlert (Ale_WARNING,Txt_Movement_not_allowed);
/***** Get the code of the program item *****/
ItmCod = Resource.ItmCod;
FormLevel = Prg_GetLevelFromNumItem (Prg_GetNumItemFromItmCod (Resource.ItmCod));
/***** Show current program items, if any *****/
Prg_SetItemRangeEmpty (&ToHighlight);
Prg_ShowAllItems (Prg_EDIT_RESOURCES,
&ToHighlight,-1L,ItmCod,FormLevel);
/***** Free list of program items *****/
Prg_FreeListItems ();
}
/*****************************************************************************/
/**** Exchange the order of two consecutive subtrees in a course program *****/
/*****************************************************************************/
// Return true if success
static bool PrgRsc_ExchangeResources (const struct PrgRsc_Rsc *Rsc1,
const struct PrgRsc_Rsc *Rsc2)
{
if (Rsc1->Ind > 0 && // Indexes should be in the range [1, 2,...]
Rsc2->Ind > 0)
{
/***** Lock table to make the move atomic *****/
Prg_DB_LockTableResources ();
/***** Exchange indexes of items *****/
// This implementation works with non continuous indexes
/*
Example:
Rsc1->Ind = 5
Rsc2->Ind = 17
Step 1 Step 2 Step 3 (Equivalent to)
+-------+-------+ +-------+-------+ +-------+-------+ +-------+-------+ +-------+-------+
|Rsc.Ind|Rsc.Cod| |Rsc.Ind|Rsc.Cod| |Rsc.Ind|Rsc.Cod| |Rsc.Ind|Rsc.Cod| |Rsc.Ind|Rsc.Cod|
+-------+-------+ +-------+-------+ +-------+-------+ +-------+-------+ +-------+-------+
| 5 | 218 | | 5 | 218 |-->|--> 17 | 218 | | 17 | 218 | | 5 | 240 |
| 17 | 240 |-->|-->-17 | 240 | | -17 | 240 |-->|--> 5 | 240 | | 17 | 218 |
+-------+-------+ +-------+-------+ +-------+-------+ +-------+-------+ +-------+-------+
*/
/* Step 1: Change second index to negative,
necessary to preserve unique index (ItmCod,RscInd) */
Prg_DB_UpdateRscInd (Rsc2->Cod,-(int) Rsc2->Ind);
/* Step 2: Change first index */
Prg_DB_UpdateRscInd (Rsc1->Cod, (int) Rsc2->Ind);
/* Step 3: Change second index */
Prg_DB_UpdateRscInd (Rsc2->Cod, (int) Rsc1->Ind);
/***** Unlock table *****/
DB_UnlockTables ();
return true; // Success
}
return false; // No success
}
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