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1 <?php
2 //$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/webprojs/fboprime/sw/phplib/resv.inc,v 1.5 2006/07/29 23:04:50 dashley Exp $
3 //--------------------------------------------------------------------------------------------------------------
4 //resv.inc--FboPrime Database resv Table Manipulation Functions
5 //Copyright (C) 2006 David T. Ashley
6 //
7 //This program is free software; you can redistribute it and/or
8 //modify it under the terms of the GNU General Public License
9 //as published by the Free Software Foundation; either version 2
10 //of the License, or (at your option) any later version.
11 //
12 //This program is distributed in the hope that it will be useful,
13 //but WITHOUT ANY WARRANTY; without even the implied warranty of
14 //MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 //GNU General Public License for more details.
16 //
17 //You should have received a copy of the GNU General Public License
18 //along with this program; if not, write to the Free Software
19 //Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 //********************************************************************************
21 //Contains functions related to [operations on] the usrs table of the database.
22 //-------------------------------------------------------------------------------------------------
23 //Copyright 2006 David T. Ashley
24 //-------------------------------------------------------------------------------------------------
25 //This source code and any program in which it is compiled/used is provided under the GNU GENERAL
26 //PUBLIC LICENSE, Version 3, full license text below.
27 //-------------------------------------------------------------------------------------------------
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694 //<http://www.gnu.org/licenses/>.
695 //
696 // The GNU General Public License does not permit incorporating your program
697 //into proprietary programs. If your program is a subroutine library, you
698 //may consider it more useful to permit linking proprietary applications with
699 //the library. If this is what you want to do, use the GNU Lesser General
700 //Public License instead of this License. But first, please read
701 //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
702 //-------------------------------------------------------------------------------------------------
703 //--------------------------------------------------------------------------------------------------------------
704 //
705 require_once("db.inc");
706 require_once("global.inc");
707 //
708 //--------------------------------------------------------------------------------------------------------------
709 //Constants for usrs table fields.
710 //
711 //Constants for different types of reservations.
712 define("RESV_TYPE_BANNER", 0 );
713 define("RESV_TYPE_ACTIVE", 1 );
714 define("RESV_TYPE_STANDBY", 2 );
715 //
716 //--------------------------------------------------------------------------------------------------------------
717 //Retrieves a two dimensional associative array corresponding to the RESV record
718 //with the passed IDX, or FALSE if the record does not exist.
719 //
720 function RESV_retrieve_by_idx($idx)
721 {
722 global $GLOBAL_dbhandle;
723
724 //Form the query string.
725 $query_string = "SELECT * FROM resv WHERE idx=\""
726 .
727 mysql_real_escape_string($idx, $GLOBAL_dbhandle)
728 .
729 "\"";
730
731 //Execute the query.
732 $result = mysql_query($query_string, $GLOBAL_dbhandle);
733
734 if ($result === FALSE)
735 {
736 //Unknown query failure. Return FALSE to the caller. No need to free,
737 //as this is not a result.
738 $rv = FALSE;
739 }
740 else
741 {
742 //Figure out how many rows in the result.
743 $nrows = mysql_num_rows($result);
744
745 if ($nrows == 0)
746 {
747 //No rows in the result. The query failed to give us a record, but still
748 //we need to free the result set.
749
750 //Free the result.
751 mysql_free_result($result);
752
753 //The caller gets FALSE. No record with that SID.
754 $rv = FALSE;
755 }
756 else
757 {
758 //We have at least one record. Assume just one, because the IDX is supposed
759 //to be unique.
760 $rv = mysql_fetch_assoc($result); //Get the associative record.
761
762 //Free the result.
763 mysql_free_result($result);
764 }
765
766 //Return the value to the caller.
767 return($rv);
768 }
769 }
770 //
771 //--------------------------------------------------------------------------------------------------------------
772 //Retrieves two two-dimensional arrays of elements containing full information about each reservation that
773 //overlaps into the passed time window. Two arrays are necessary because we have the need to sort both by
774 //flight instructor and by aircraft/simulator.
775 //
776 //Reservations are sorted first by index of the flight instructor/resource, then by reservation, then by the
777 //start time, then by the tie-breaker SGUID.
778 //
779 //The start-time ordering is necessary to be sure that within a displayed row, one doesn't have to sort
780 //before trying to display.
781 //
782 //For each of the two arrays, a parallel search array is also returned. The indices of the parallel search
783 //array are the same as the corresponding indices of the data array, and the values are the flight
784 //instructor/resource index. The purpose of the parallel search array are to assist in locating the data
785 //for a given flight instructor/resource by index in the data array as rapidly as possible.
786 //
787 //If no reservations apply for either of the two queries, FALSE is returned in both the data array and
788 //the search array.
789 //
790 function RESV_resvns_in_time_window( $stime_startwindow_in,
791 $stime_endwindow_in,
792 &$flight_inst_data_array,
793 &$flight_inst_search_array,
794 &$resource_data_array,
795 &$resource_search_array )
796 {
797 global $GLOBAL_dbhandle;
798
799 //------------------------------------------------------------------------------------------------------------
800 //Start with a clean slate for the output variables.
801 //
802 if (isset($flight_inst_data_array))
803 unset($flight_inst_data_array);
804 if (isset($flight_inst_search_array))
805 unset($flight_inst_search_array);
806 if (isset($resource_data_array))
807 unset($resource_data_array);
808 if (isset($resource_search_array))
809 unset($resource_search_array);
810 //
811 //------------------------------------------------------------------------------------------------------------
812 //Flight instructor half.
813 //
814 $query_string = "SELECT * FROM resv WHERE finstid!=\"0\" AND finsttimestart<\""
815 .
816 $stime_endwindow_in
817 .
818 "\" AND finsttimeend>\""
819 .
820 $stime_startwindow_in
821 .
822 "\" ORDER BY finstid, type, finsttimestart, crsguid ASC";
823
824 $result = mysql_query($query_string, $GLOBAL_dbhandle);
825
826 //If the query did not go through successfully, return FALSE to the caller.
827 //
828 if ($result === FALSE)
829 {
830 //The caller gets FALSE signaling no data.
831 $flight_inst_data_array = FALSE;
832 $flight_inst_search_array = FALSE;
833 }
834 //
835 //If the number of rows in the result set is 0, also give the caller FALSE.
836 else if (mysql_num_rows($result) <= 0)
837 {
838 //Technically, we got a result set, so free it.
839 mysql_free_result($result);
840
841 //The caller gets FALSE signaling no data.
842 $flight_inst_data_array = FALSE;
843 $flight_inst_search_array = FALSE;
844 }
845 else
846 {
847 //If we're here, we have a valid result set. Each row of the returned array is
848 //the expected fields from the resv table.
849
850 //Copy out the results to the array we'll return.
851 while ($row = mysql_fetch_assoc($result))
852 {
853 $flight_inst_data_array[] = $row; //Assign the data.
854 $flight_inst_search_array[] = $row["finstid"]; //Set the search index.
855 }
856
857 //Free memory.
858 mysql_free_result($result);
859 }
860
861 //------------------------------------------------------------------------------------------------------------
862 //Resource half.
863 //
864 $query_string = "SELECT * FROM resv WHERE acftsimid!=\"0\" AND acftsimtimestart<\""
865 .
866 $stime_endwindow_in
867 .
868 "\" AND acftsimtimeend>\""
869 .
870 $stime_startwindow_in
871 .
872 "\" ORDER BY acftsimid, type, acftsimtimestart, crsguid ASC";
873
874 $result = mysql_query($query_string, $GLOBAL_dbhandle);
875
876 //If the query did not go through successfully, return FALSE to the caller.
877 //
878 if ($result === FALSE)
879 {
880 //The caller gets FALSE signaling no data.
881 $resource_data_array = FALSE;
882 $resource_search_array = FALSE;
883 }
884 //
885 //If the number of rows in the result set is 0, also give the caller FALSE.
886 else if (mysql_num_rows($result) <= 0)
887 {
888 //Technically, we got a result set, so free it.
889 mysql_free_result($result);
890
891 //The caller gets FALSE signaling no data.
892 $resource_data_array = FALSE;
893 $resource_search_array = FALSE;
894 }
895 else
896 {
897 //If we're here, we have a valid result set. Each row of the returned array is
898 //the expected fields from the resv table.
899
900 //Copy out the results to the array we'll return.
901 while ($row = mysql_fetch_assoc($result))
902 {
903 $resource_data_array[] = $row; //Assign the data.
904 $resource_search_array[] = $row["acftsimid"]; //Set the search index.
905 }
906
907 //Free memory.
908 mysql_free_result($result);
909 }
910 }
911 //
912 //--------------------------------------------------------------------------------------------------------------
913 //Extracts the records pertaining to a certain flight instructor from an array returned from
914 //the RESV_resvns_in_time_window() function, using the search array as a search aid. Returns FALSE
915 //if no match.
916 //
917 //Records must not have been rearranged (they must still be sorted by the flight instructor ID).
918 //
919 function RESV_extract_finst_records($data_array_in, $search_array_in, $idx_to_find_in)
920 {
921 //If the data array or search array are FALSE, then the result is FALSE, i.e. subset of the
922 //empty set is also the empty set.
923 if (($data_array_in === FALSE) || ($search_array_in === FALSE))
924 {
925 return(FALSE);
926 }
927
928 //Find the first record with the passed index, if any. This is enough, as the others will be contiguous.
929 $index = array_search($idx_to_find_in, $search_array_in);
930
931 //If there is no match, return FALSE.
932 if (($index === FALSE) || ($index === NULL))
933 {
934 return(FALSE);
935 }
936
937 //If we're here, we have success. Find out how many elements in the array, for reference.
938 $n = count($data_array_in);
939
940 //Tack the original search success onto the return value.
941 $rv[] = $data_array_in[$index];
942
943 //Find any others.
944 $index++;
945 while (($index < $n) && ($search_array_in[$index] == $idx_to_find_in))
946 {
947 $rv[] = $data_array_in[$index];
948 $index++;
949 }
950
951 //Return the results.
952 return($rv);
953 }
954 //
955 //--------------------------------------------------------------------------------------------------------------
956 //Extracts the records pertaining to a certain resource (aircraft/simulator) from an array returned from
957 //the RESV_resvns_in_time_window() function, using the search array as a search aid. Returns FALSE
958 //if no match.
959 //
960 //Records must not have been rearranged (they must still be sorted by the resource ID).
961 //
962 function RESV_extract_resource_records($data_array_in, $search_array_in, $idx_to_find_in)
963 {
964 //If the data array or search array are FALSE, then the result is FALSE, i.e. subset of the
965 //empty set is also the empty set.
966 if (($data_array_in === FALSE) || ($search_array_in === FALSE))
967 {
968 return(FALSE);
969 }
970
971 //Find the first record with the passed index, if any. This is enough, as the others will be contiguous.
972 $index = array_search($idx_to_find_in, $search_array_in);
973
974 //If there is no match, return FALSE.
975 if (($index === FALSE) || ($index === NULL))
976 {
977 return(FALSE);
978 }
979
980 //If we're here, we have success. Find out how many elements in the array, for reference.
981 $n = count($data_array_in);
982
983 //Tack the original search success onto the return value.
984 $rv[] = $data_array_in[$index];
985
986 //Find any others.
987 $index++;
988 while (($index < $n) && ($search_array_in[$index] == $idx_to_find_in))
989 {
990 $rv[] = $data_array_in[$index];
991 $index++;
992 }
993
994 //Return the results.
995 return($rv);
996 }
997 //
998 //--------------------------------------------------------------------------------------------------------------
999 //End of $RCSfile: resv.inc,v $.
1000 //--------------------------------------------------------------------------------------------------------------
1001 ?>

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