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swad-core/swad_game_database.c

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// swad_game_database.c: games using remote control, operations with database
/*
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) 1999-2023 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 ***********************************/
/*****************************************************************************/
#define _GNU_SOURCE // For asprintf
#include <stdio.h> // For asprintf
#include <stdlib.h> // For free
#include "swad_database.h"
#include "swad_error.h"
#include "swad_game.h"
#include "swad_game_database.h"
#include "swad_global.h"
/*****************************************************************************/
/************** External global variables from others modules ****************/
/*****************************************************************************/
extern struct Globals Gbl;
/*****************************************************************************/
/**************************** Create a new game ******************************/
/*****************************************************************************/
long Gam_DB_CreateGame (const struct Gam_Game *Game,const char *Txt)
{
Str_SetDecimalPointToUS (); // To write the decimal point as a dot
return
DB_QueryINSERTandReturnCode ("can not create new game",
"INSERT INTO gam_games"
" (CrsCod,Hidden,UsrCod,MaxGrade,Visibility,"
"Title,Txt)"
" VALUES"
" (%ld,'N',%ld,%.15lg,%u,"
"'%s','%s')",
Gbl.Hierarchy.Crs.CrsCod,
Gbl.Usrs.Me.UsrDat.UsrCod,
Game->MaxGrade,
Game->Visibility,
Game->Title,
Txt);
Str_SetDecimalPointToLocal (); // Return to local system
}
/*****************************************************************************/
/*************************** Update an existing game *************************/
/*****************************************************************************/
void Gam_DB_UpdateGame (const struct Gam_Game *Game,const char *Txt)
{
Str_SetDecimalPointToUS (); // To write the decimal point as a dot
DB_QueryUPDATE ("can not update game",
"UPDATE gam_games"
" SET CrsCod=%ld,"
"MaxGrade=%.15lg,"
"Visibility=%u,"
"Title='%s',"
"Txt='%s'"
" WHERE GamCod=%ld",
Gbl.Hierarchy.Crs.CrsCod,
Game->MaxGrade,
Game->Visibility,
Game->Title,
Txt,
Game->GamCod);
Str_SetDecimalPointToLocal (); // Return to local system
}
/*****************************************************************************/
/*************************** Hide/unhide a game ******************************/
/*****************************************************************************/
void Gam_DB_HideOrUnhideGame (long GamCod,bool Hide)
{
DB_QueryUPDATE ("can not hide/unhide game",
"UPDATE gam_games"
" SET Hidden='%c'"
" WHERE GamCod=%ld",
Hide ? 'Y' :
'N',
GamCod);
}
/*****************************************************************************/
/*************** Get list of all games in the current course *****************/
/*****************************************************************************/
unsigned Gam_DB_GetListGames (MYSQL_RES **mysql_res,Gam_Order_t SelectedOrder)
{
static const char *OrderBySubQuery[Gam_NUM_ORDERS] =
{
[Gam_ORDER_BY_START_DATE] = "StartTime DESC,"
"EndTime DESC,"
"gam_games.Title DESC",
[Gam_ORDER_BY_END_DATE ] = "EndTime DESC,"
"StartTime DESC,"
"gam_games.Title DESC",
[Gam_ORDER_BY_TITLE ] = "gam_games.Title",
};
char *HiddenSubQuery;
unsigned NumGames;
/***** Subquery: get hidden games depending on user's role *****/
switch (Gbl.Usrs.Me.Role.Logged)
{
case Rol_STD:
if (asprintf (&HiddenSubQuery," AND gam_games.Hidden='N'") < 0)
Err_NotEnoughMemoryExit ();
break;
case Rol_NET:
case Rol_TCH:
case Rol_DEG_ADM:
case Rol_CTR_ADM:
case Rol_INS_ADM:
case Rol_SYS_ADM:
if (asprintf (&HiddenSubQuery,"%s","") < 0)
Err_NotEnoughMemoryExit ();
break;
default:
Err_WrongRoleExit ();
break;
}
/***** Get list of games from database *****/
NumGames = (unsigned)
DB_QuerySELECT (mysql_res,"can not get games",
"SELECT gam_games.GamCod," // row[0]
"MIN(mch_matches.StartTime) AS StartTime," // row[1]
"MAX(mch_matches.EndTime) AS EndTime" // row[2]
" FROM gam_games"
" LEFT JOIN mch_matches"
" ON gam_games.GamCod=mch_matches.GamCod"
" WHERE gam_games.CrsCod=%ld"
"%s"
" GROUP BY gam_games.GamCod"
" ORDER BY %s",
Gbl.Hierarchy.Crs.CrsCod,
HiddenSubQuery,
OrderBySubQuery[SelectedOrder]);
/***** Free allocated memory for subquery *****/
free (HiddenSubQuery);
return NumGames;
}
/*****************************************************************************/
/*************** Get data of all games in the current course *****************/
/*****************************************************************************/
unsigned Gam_DB_GetListAvailableGames (MYSQL_RES **mysql_res)
{
return (unsigned)
DB_QuerySELECT (mysql_res,"can not get games",
"SELECT gam_games.GamCod," // row[0]
"gam_games.UsrCod," // row[1]
"UNIX_TIMESTAMP(MIN(mch_matches.StartTime)) AS StartTime," // row[2]
"UNIX_TIMESTAMP(MAX(mch_matches.EndTime)) AS EndTime," // row[3]
"gam_games.MaxGrade," // row[4]
"gam_games.Visibility," // row[5]
"gam_games.Title," // row[6]
"gam_games.Txt" // row[7]
" FROM gam_games"
" LEFT JOIN mch_matches"
" ON gam_games.GamCod=mch_matches.GamCod"
" WHERE gam_games.CrsCod=%ld"
" AND Hidden='N'"
" GROUP BY gam_games.GamCod"
" ORDER BY StartTime DESC,"
"EndTime DESC,"
"gam_games.Title DESC",
Gbl.Hierarchy.Crs.CrsCod);
}
/*****************************************************************************/
/********************** Get game data using its code *************************/
/*****************************************************************************/
unsigned Gam_DB_GetGameDataByCod (MYSQL_RES **mysql_res,long GamCod)
{
return (unsigned)
DB_QuerySELECT (mysql_res,"can not get game data",
"SELECT gam_games.GamCod," // row[0]
"gam_games.CrsCod," // row[1]
"gam_games.Hidden," // row[2]
"gam_games.UsrCod," // row[3]
"gam_games.MaxGrade," // row[4]
"gam_games.Visibility," // row[5]
"gam_games.Title" // row[6]
" FROM gam_games"
" LEFT JOIN mch_matches"
" ON gam_games.GamCod=mch_matches.GamCod"
" WHERE gam_games.GamCod=%ld"
" AND gam_games.CrsCod=%ld", // Extra check
GamCod,
Gbl.Hierarchy.Crs.CrsCod);
}
/*****************************************************************************/
/*********************** Get game title from database ************************/
/*****************************************************************************/
void Gam_DB_GetGameTitle (long GamCod,char *Title,size_t TitleSize)
{
DB_QuerySELECTString (Title,TitleSize,"can not get game title",
"SELECT Title" // row[0]
" FROM gam_games"
" WHERE GamCod=%ld"
" AND CrsCod=%ld", // Extra check
GamCod,
Gbl.Hierarchy.Crs.CrsCod);
}
/*****************************************************************************/
/********************** Get game text from database ************************/
/*****************************************************************************/
void Gam_DB_GetGameTxt (long GamCod,char Txt[Cns_MAX_BYTES_TEXT + 1])
{
DB_QuerySELECTString (Txt,Cns_MAX_BYTES_TEXT,"can not get game text",
"SELECT Txt" // row[0]
" FROM gam_games"
" WHERE GamCod=%ld",
GamCod);
}
/*****************************************************************************/
/******************* Check if the title of a game exists *******************/
/*****************************************************************************/
bool Gam_DB_CheckIfSimilarGameExists (const struct Gam_Game *Game)
{
return
DB_QueryEXISTS ("can not check similar games",
"SELECT EXISTS"
"(SELECT *"
" FROM gam_games"
" WHERE CrsCod=%ld"
" AND Title='%s'"
" AND GamCod<>%ld)",
Gbl.Hierarchy.Crs.CrsCod,
Game->Title,
Game->GamCod);
}
/*****************************************************************************/
/********************* Get number of courses with games **********************/
/*****************************************************************************/
// Returns the number of courses with games in this location
unsigned Gam_DB_GetNumCoursesWithGames (HieLvl_Level_t Scope)
{
/***** Get number of courses with games from database *****/
switch (Scope)
{
case HieLvl_SYS:
return (unsigned)
DB_QueryCOUNT ("can not get number of courses with games",
"SELECT COUNT(DISTINCT CrsCod)"
" FROM gam_games");
case HieLvl_CTY:
return (unsigned)
DB_QueryCOUNT ("can not get number of courses with games",
"SELECT COUNT(DISTINCT gam_games.CrsCod)"
" FROM ins_instits,"
"ctr_centers,"
"deg_degrees,"
"crs_courses,"
"gam_games"
" WHERE ins_instits.CtyCod=%ld"
" AND ins_instits.InsCod=ctr_centers.InsCod"
" AND ctr_centers.CtrCod=deg_degrees.CtrCod"
" AND deg_degrees.DegCod=crs_courses.DegCod"
" AND crs_courses.CrsCod=gam_games.CrsCod",
Gbl.Hierarchy.Cty.CtyCod);
case HieLvl_INS:
return (unsigned)
DB_QueryCOUNT ("can not get number of courses with games",
"SELECT COUNT(DISTINCT gam_games.CrsCod)"
" FROM ctr_centers,"
"deg_degrees,"
"crs_courses,"
"gam_games"
" WHERE ctr_centers.InsCod=%ld"
" AND ctr_centers.CtrCod=deg_degrees.CtrCod"
" AND deg_degrees.DegCod=crs_courses.DegCod"
" AND crs_courses.CrsCod=gam_games.CrsCod",
Gbl.Hierarchy.Ins.InsCod);
case HieLvl_CTR:
return (unsigned)
DB_QueryCOUNT ("can not get number of courses with games",
"SELECT COUNT(DISTINCT gam_games.CrsCod)"
" FROM deg_degrees,"
"crs_courses,"
"gam_games"
" WHERE deg_degrees.CtrCod=%ld"
" AND deg_degrees.DegCod=crs_courses.DegCod"
" AND crs_courses.CrsCod=gam_games.CrsCod",
Gbl.Hierarchy.Ctr.CtrCod);
case HieLvl_DEG:
return (unsigned)
DB_QueryCOUNT ("can not get number of courses with games",
"SELECT COUNT(DISTINCT gam_games.CrsCod)"
" FROM crs_courses,"
"gam_games"
" WHERE crs_courses.DegCod=%ld"
" AND crs_courses.CrsCod=gam_games.CrsCod",
Gbl.Hierarchy.Deg.DegCod);
case HieLvl_CRS:
return (unsigned)
DB_QueryCOUNT ("can not get number of courses with games",
"SELECT COUNT(DISTINCT CrsCod)"
" FROM gam_games"
" WHERE CrsCod=%ld",
Gbl.Hierarchy.Crs.CrsCod);
default:
return 0;
}
}
/*****************************************************************************/
/**************************** Get number of games ****************************/
/*****************************************************************************/
// Returns the number of games in this location
unsigned Gam_DB_GetNumGames (HieLvl_Level_t Scope)
{
/***** Get number of games from database *****/
switch (Scope)
{
case HieLvl_SYS:
return (unsigned)
DB_QueryCOUNT ("can not get number of games",
"SELECT COUNT(*)"
" FROM gam_games");
case HieLvl_CTY:
return (unsigned)
DB_QueryCOUNT ("can not get number of games",
"SELECT COUNT(*)"
" FROM ins_instits,"
"ctr_centers,"
"deg_degrees,"
"crs_courses,"
"gam_games"
" WHERE ins_instits.CtyCod=%ld"
" AND ins_instits.InsCod=ctr_centers.InsCod"
" AND ctr_centers.CtrCod=deg_degrees.CtrCod"
" AND deg_degrees.DegCod=crs_courses.DegCod"
" AND crs_courses.CrsCod=gam_games.CrsCod",
Gbl.Hierarchy.Cty.CtyCod);
case HieLvl_INS:
return (unsigned)
DB_QueryCOUNT ("can not get number of games",
"SELECT COUNT(*)"
" FROM ctr_centers,"
"deg_degrees,"
"crs_courses,"
"gam_games"
" WHERE ctr_centers.InsCod=%ld"
" AND ctr_centers.CtrCod=deg_degrees.CtrCod"
" AND deg_degrees.DegCod=crs_courses.DegCod"
" AND crs_courses.CrsCod=gam_games.CrsCod",
Gbl.Hierarchy.Ins.InsCod);
case HieLvl_CTR:
return (unsigned)
DB_QueryCOUNT ("can not get number of games",
"SELECT COUNT(*)"
" FROM deg_degrees,"
"crs_courses,"
"gam_games"
" WHERE deg_degrees.CtrCod=%ld"
" AND deg_degrees.DegCod=crs_courses.DegCod"
" AND crs_courses.CrsCod=gam_games.CrsCod",
Gbl.Hierarchy.Ctr.CtrCod);
case HieLvl_DEG:
return (unsigned)
DB_QueryCOUNT ("can not get number of games",
"SELECT COUNT(*)"
" FROM crs_courses,"
"gam_games"
" WHERE crs_courses.DegCod=%ld"
" AND crs_courses.CrsCod=gam_games.CrsCod",
Gbl.Hierarchy.Deg.DegCod);
case HieLvl_CRS:
return (unsigned)
DB_QueryCOUNT ("can not get number of games",
"SELECT COUNT(*)"
" FROM gam_games"
" WHERE CrsCod=%ld",
Gbl.Hierarchy.Crs.CrsCod);
default:
return 0;
}
}
/*****************************************************************************/
/********************************* Remove game *******************************/
/*****************************************************************************/
void Gam_DB_RemoveGame (long GamCod)
{
DB_QueryDELETE ("can not remove game",
"DELETE FROM gam_games"
" WHERE GamCod=%ld",
GamCod);
}
/*****************************************************************************/
/*********************** Remove the games of a course ************************/
/*****************************************************************************/
void Gam_DB_RemoveCrsGames (long CrsCod)
{
DB_QueryDELETE ("can not remove course games",
"DELETE FROM gam_games"
" WHERE CrsCod=%ld",
CrsCod);
}
/*****************************************************************************/
/**************** Insert question in the table of questions ******************/
/*****************************************************************************/
void Gam_DB_InsertQstInGame (long GamCod,unsigned QstInd,long QstCod)
{
DB_QueryINSERT ("can not add question to game",
"INSERT INTO gam_questions"
" (GamCod,QstInd,QstCod)"
" VALUES"
" (%ld,%u,%ld)",
GamCod,
QstInd,
QstCod);
}
/*****************************************************************************/
/*********** Update indexes of questions greater than a given one ************/
/*****************************************************************************/
void Gam_DB_UpdateIndexesOfQstsGreaterThan (long GamCod,unsigned QstInd)
{
DB_QueryUPDATE ("can not update indexes of questions",
"UPDATE gam_questions"
" SET QstInd=QstInd-1"
" WHERE GamCod=%ld"
" AND QstInd>%u",
GamCod,
QstInd);
}
/*****************************************************************************/
/********************* Change index of a set in an exam **********************/
/*****************************************************************************/
void Gam_DB_UpdateQstIndex (long QstInd,long GamCod,long QstCod)
{
DB_QueryUPDATE ("can not exchange indexes of questions",
"UPDATE gam_questions"
" SET QstInd=%ld"
" WHERE GamCod=%ld"
" AND QstCod=%ld",
QstInd,
GamCod,
QstCod);
}
/*****************************************************************************/
/************ Lock table to make the exchange of questions atomic ************/
/*****************************************************************************/
void Gam_DB_LockTable (void)
{
DB_Query ("can not lock tables to move game question",
"LOCK TABLES gam_questions WRITE");
DB_SetThereAreLockedTables ();
}
/*****************************************************************************/
/******************* Get number of questions of a game *********************/
/*****************************************************************************/
unsigned Gam_DB_GetNumQstsGame (long GamCod)
{
/***** Get nuumber of questions in a game from database *****/
return (unsigned)
DB_QueryCOUNT ("can not get number of questions of a game",
"SELECT COUNT(*)"
" FROM gam_questions"
" WHERE GamCod=%ld",
GamCod);
}
/*****************************************************************************/
/************************ Get the questions of a game ************************/
/*****************************************************************************/
unsigned Gam_DB_GetGameQuestionsBasic (MYSQL_RES **mysql_res,long GamCod)
{
return (unsigned)
DB_QuerySELECT (mysql_res,"can not get game questions",
"SELECT QstCod," // row[0]
"QstInd" // row[1]
" FROM gam_questions"
" WHERE GamCod=%ld"
" ORDER BY QstInd",
GamCod);
}
/*****************************************************************************/
/************************ Get the questions of a game ************************/
/*****************************************************************************/
unsigned Gam_DB_GetGameQuestionsFull (MYSQL_RES **mysql_res,long GamCod)
{
return (unsigned)
DB_QuerySELECT (mysql_res,"can not get questions of a game",
"SELECT gam_questions.QstCod," // row[0]
"gam_questions.QstInd," // row[1]
"tst_questions.AnsType," // row[2]
"tst_questions.Shuffle" // row[3]
" FROM gam_questions,"
"tst_questions"
" WHERE gam_questions.GamCod=%ld"
" AND gam_questions.QstCod=tst_questions.QstCod"
" ORDER BY gam_questions.QstInd",
GamCod);
}
/*****************************************************************************/
/************ Get question code given game and index of question *************/
/*****************************************************************************/
long Gam_DB_GetQstCodFromQstInd (long GamCod,unsigned QstInd)
{
long QstCod;
/***** Get question code of the question to be moved up *****/
QstCod = DB_QuerySELECTCode ("can not get question code",
"SELECT QstCod"
" FROM gam_questions"
" WHERE GamCod=%ld"
" AND QstInd=%u",
GamCod,
QstInd);
if (QstCod <= 0)
Err_WrongQuestionExit ();
return QstCod;
}
/*****************************************************************************/
/************ Get question index given game and code of question *************/
/*****************************************************************************/
// Return 0 is question is not present in game
unsigned Gam_DB_GetQstIndFromQstCod (long GamCod,long QstCod)
{
/***** Get question index in a game given the question code *****/
return DB_QuerySELECTUnsigned ("can not get question index",
"SELECT QstInd"
" FROM gam_questions"
" WHERE GamCod=%ld"
" AND QstCod=%ld",
GamCod,
QstCod);
}
/*****************************************************************************/
/****************** Get maximum question index in a game *********************/
/*****************************************************************************/
// Question index can be 1, 2, 3...
// Return 0 if no questions
unsigned Gam_DB_GetMaxQuestionIndexInGame (long GamCod)
{
/***** Get maximum question index in a game from database *****/
return DB_QuerySELECTUnsigned ("can not get last question index",
"SELECT MAX(QstInd)"
" FROM gam_questions"
" WHERE GamCod=%ld",
GamCod);
}
/*****************************************************************************/
/*********** Get previous question index to a given index in a game **********/
/*****************************************************************************/
// Input question index can be 1, 2, 3... n-1
// Return question index will be 1, 2, 3... n if previous question exists, or 0 if no previous question
unsigned Gam_DB_GetPrevQuestionIndexInGame (long GamCod,unsigned QstInd)
{
/***** Get previous question index in a game from database *****/
// Although indexes are always continuous...
// ...this implementation works even with non continuous indexes
return DB_QuerySELECTUnsigned ("can not get previous question index",
"SELECT COALESCE(MAX(QstInd),0)"
" FROM gam_questions"
" WHERE GamCod=%ld"
" AND QstInd<%u",
GamCod,
QstInd);
}
/*****************************************************************************/
/************* Get next question index to a given index in a game ************/
/*****************************************************************************/
// Input question index can be 0, 1, 2, 3... n-1
// Return question index will be 1, 2, 3... n if next question exists, or big number if no next question
unsigned Gam_DB_GetNextQuestionIndexInGame (long GamCod,unsigned QstInd)
{
/***** Get next question index in a game from database *****/
// Although indexes are always continuous...
// ...this implementation works even with non continuous indexes
return DB_QuerySELECTUnsigned ("can not get next question index",
"SELECT COALESCE(MIN(QstInd),%u)"
" FROM gam_questions"
" WHERE GamCod=%ld"
" AND QstInd>%u",
Gam_AFTER_LAST_QUESTION, // End of questions has been reached
GamCod,
QstInd);
}
/*****************************************************************************/
/***************** Get average number of questions per game ******************/
/*****************************************************************************/
double Gam_DB_GetNumQstsPerGame (HieLvl_Level_t Scope)
{
/***** Get number of questions per game from database *****/
switch (Scope)
{
case HieLvl_SYS:
return
DB_QuerySELECTDouble ("can not get number of questions per game",
"SELECT AVG(NumQsts)"
" FROM (SELECT COUNT(gam_questions.QstCod) AS NumQsts"
" FROM gam_games,"
"gam_questions"
" WHERE gam_games.GamCod=gam_questions.GamCod"
" GROUP BY gam_questions.GamCod) AS NumQstsTable");
case HieLvl_CTY:
return
DB_QuerySELECTDouble ("can not get number of questions per game",
"SELECT AVG(NumQsts)"
" FROM (SELECT COUNT(gam_questions.QstCod) AS NumQsts"
" FROM ins_instits,"
"ctr_centers,"
"deg_degrees,"
"crs_courses,"
"gam_games,"
"gam_questions"
" WHERE ins_instits.CtyCod=%ld"
" AND ins_instits.InsCod=ctr_centers.InsCod"
" AND ctr_centers.CtrCod=deg_degrees.CtrCod"
" AND deg_degrees.DegCod=crs_courses.DegCod"
" AND crs_courses.CrsCod=gam_games.CrsCod"
" AND gam_games.GamCod=gam_questions.GamCod"
" GROUP BY gam_questions.GamCod) AS NumQstsTable",
Gbl.Hierarchy.Cty.CtyCod);
case HieLvl_INS:
return
DB_QuerySELECTDouble ("can not get number of questions per game",
"SELECT AVG(NumQsts)"
" FROM (SELECT COUNT(gam_questions.QstCod) AS NumQsts"
" FROM ctr_centers,"
"deg_degrees,"
"crs_courses,"
"gam_games,"
"gam_questions"
" WHERE ctr_centers.InsCod=%ld"
" AND ctr_centers.CtrCod=deg_degrees.CtrCod"
" AND deg_degrees.DegCod=crs_courses.DegCod"
" AND crs_courses.CrsCod=gam_games.CrsCod"
" AND gam_games.GamCod=gam_questions.GamCod"
" GROUP BY gam_questions.GamCod) AS NumQstsTable",
Gbl.Hierarchy.Ins.InsCod);
case HieLvl_CTR:
return
DB_QuerySELECTDouble ("can not get number of questions per game",
"SELECT AVG(NumQsts)"
" FROM (SELECT COUNT(gam_questions.QstCod) AS NumQsts"
" FROM deg_degrees,"
"crs_courses,"
"gam_games,"
"gam_questions"
" WHERE deg_degrees.CtrCod=%ld"
" AND deg_degrees.DegCod=crs_courses.DegCod"
" AND crs_courses.CrsCod=gam_games.CrsCod"
" AND gam_games.GamCod=gam_questions.GamCod"
" GROUP BY gam_questions.GamCod) AS NumQstsTable",
Gbl.Hierarchy.Ctr.CtrCod);
case HieLvl_DEG:
return
DB_QuerySELECTDouble ("can not get number of questions per game",
"SELECT AVG(NumQsts)"
" FROM (SELECT COUNT(gam_questions.QstCod) AS NumQsts"
" FROM crs_courses,"
"gam_games,"
"gam_questions"
" WHERE crs_courses.DegCod=%ld"
" AND crs_courses.CrsCod=gam_games.CrsCod"
" AND gam_games.GamCod=gam_questions.GamCod"
" GROUP BY gam_questions.GamCod) AS NumQstsTable",
Gbl.Hierarchy.Deg.DegCod);
case HieLvl_CRS:
return
DB_QuerySELECTDouble ("can not get number of questions per game",
"SELECT AVG(NumQsts)"
" FROM (SELECT COUNT(gam_questions.QstCod) AS NumQsts"
" FROM gam_games,"
"gam_questions"
" WHERE gam_games.Cod=%ld"
" AND gam_games.GamCod=gam_questions.GamCod"
" GROUP BY gam_questions.GamCod) AS NumQstsTable",
Gbl.Hierarchy.Crs.CrsCod);
default:
Err_WrongScopeExit ();
return 0.0; // Not reached
}
}
/*****************************************************************************/
/********************* Get all tags of questions in a game *******************/
/*****************************************************************************/
unsigned Gam_DB_GetTstTagsPresentInAGame (MYSQL_RES **mysql_res,long GamCod)
{
return (unsigned)
DB_QuerySELECT (mysql_res,"can not get tags present in a match result",
"SELECT tst_tags.TagTxt" // row[0]
" FROM (SELECT DISTINCT "
"tst_question_tags.TagCod"
" FROM tst_question_tags,gam_questions"
" WHERE gam_questions.GamCod=%ld"
" AND gam_questions.QstCod=tst_question_tags.QstCod) AS TagsCods,"
"tst_tags"
" WHERE TagsCods.TagCod=tst_tags.TagCod"
" ORDER BY tst_tags.TagTxt",
GamCod);
}
/*****************************************************************************/
/************* Get number of answers of each question in a game **************/
/*****************************************************************************/
unsigned Gam_DB_GetNumAnswersOfQstsInGame (MYSQL_RES **mysql_res,long GamCod)
{
return (unsigned)
DB_QuerySELECT (mysql_res,"can not get data of a question",
"SELECT COUNT(tst_answers.AnsInd) AS N" // row[0]
" FROM tst_answers,"
"gam_questions"
" WHERE gam_questions.GamCod=%ld"
" AND gam_questions.QstCod=tst_answers.QstCod"
" GROUP BY tst_answers.QstCod",
GamCod);
}
/*****************************************************************************/
/************************* Remove question from game *************************/
/*****************************************************************************/
void Gam_DB_RemoveQstFromGame (long GamCod,unsigned QstInd)
{
DB_QueryDELETE ("can not remove a question",
"DELETE FROM gam_questions"
" WHERE GamCod=%ld"
" AND QstInd=%u",
GamCod,
QstInd);
}
/*****************************************************************************/
/**************************** Remove game questions **************************/
/*****************************************************************************/
void Gam_DB_RemoveGameQsts (long GamCod)
{
DB_QueryDELETE ("can not remove game questions",
"DELETE FROM gam_questions"
" WHERE GamCod=%ld",
GamCod);
}
/*****************************************************************************/
/***************** Remove the questions in games of a course *****************/
/*****************************************************************************/
void Gam_DB_RemoveCrsGameQsts (long CrsCod)
{
DB_QueryDELETE ("can not remove questions in course games",
"DELETE FROM gam_questions"
" USING gam_games,"
"gam_questions"
" WHERE gam_games.CrsCod=%ld"
" AND gam_games.GamCod=gam_questions.GamCod",
CrsCod);
}
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