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Now chats are backuped too !! :-)

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1 parent 74a0363 commit 724db5766152c8c1559400b868624f0f2b886129 stronk7 committed Aug 3, 2003
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  1. +139 −0 mod/chat/backuplib.php
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+<?PHP //$Id$
+ //This php script contains all the stuff to backup/restore
+ //chat mods
+
+ //This is the "graphical" structure of the chat mod:
+ //
+ // chat
+ // (CL,pk->id)
+ // |
+ // |
+ // |
+ // chat_messages
+ // (UL,pk->id, fk->chatid)
+ //
+ // Meaning: pk->primary key field of the table
+ // fk->foreign key to link with parent
+ // nt->nested field (recursive data)
+ // CL->course level info
+ // UL->user level info
+ // files->table may have files)
+ //
+ //-----------------------------------------------------------
+
+ //This function executes all the backup procedure about this mod
+ function chat_backup_mods($bf,$preferences) {
+
+ global $CFG;
+
+ $status = true;
+
+ //Iterate over chat table
+ $chats = get_records ("chat","course",$preferences->backup_course,"id");
+ if ($chats) {
+ foreach ($chats as $chat) {
+ //Start mod
+ fwrite ($bf,start_tag("MOD",3,true));
+ //Print chat data
+ fwrite ($bf,full_tag("ID",4,false,$chat->id));
+ fwrite ($bf,full_tag("MODTYPE",4,false,"chat"));
+ fwrite ($bf,full_tag("NAME",4,false,$chat->name));
+ fwrite ($bf,full_tag("INTRO",4,false,$chat->intro));
+ fwrite ($bf,full_tag("KEEPDAYS",4,false,$chat->keepdays));
+ fwrite ($bf,full_tag("STUDENTLOGS",4,false,$chat->studentlogs));
+ fwrite ($bf,full_tag("SCHEDULE",4,false,$chat->schedule));
+ fwrite ($bf,full_tag("CHATTIME",4,false,$chat->chattime));
+ fwrite ($bf,full_tag("TIMEMODIFIED",4,false,$chat->timemodified));
+ //if we've selected to backup users info, then execute backup_chat_messages
+ if ($preferences->mods["chat"]->userinfo) {
+ $status = backup_chat_messages($bf,$preferences,$chat->id);
+ }
+ //End mod
+ $status =fwrite ($bf,end_tag("MOD",3,true));
+ }
+ }
+ return $status;
+ }
+
+ //Backup chat_messages contents (executed from chat_backup_mods)
+ function backup_chat_messages ($bf,$preferences,$chat) {
+
+ global $CFG;
+
+ $status = true;
+
+ $chat_messages = get_records("chat_messages","chatid",$chat,"id");
+ //If there is messages
+ if ($chat_messages) {
+ //Write start tag
+ $status =fwrite ($bf,start_tag("MESSAGES",4,true));
+ //Iterate over each message
+ foreach ($chat_messages as $cha_mes) {
+ //Start message
+ $status =fwrite ($bf,start_tag("MESSAGE",5,true));
+ //Print message contents
+ fwrite ($bf,full_tag("ID",6,false,$cha_mes->id));
+ fwrite ($bf,full_tag("USERID",6,false,$cha_mes->userid));
+ fwrite ($bf,full_tag("SYSTEM",6,false,$cha_mes->system));
+ fwrite ($bf,full_tag("MESSAGE_TEXT",6,false,$cha_mes->message));
+ fwrite ($bf,full_tag("TIMESTAMP",6,false,$cha_mes->timestamp));
+ //End submission
+ $status =fwrite ($bf,end_tag("MESSAGE",5,true));
+ }
+ //Write end tag
+ $status =fwrite ($bf,end_tag("MESSAGES",4,true));
+ }
+ return $status;
+ }
+
+ //Return an array of info (name,value)
+ function chat_check_backup_mods($course,$user_data=false,$backup_unique_code) {
+ //First the course data
+ $info[0][0] = get_string("modulenameplural","chat");
+ if ($ids = chat_ids ($course)) {
+ $info[0][1] = count($ids);
+ } else {
+ $info[0][1] = 0;
+ }
+
+ //Now, if requested, the user_data
+ if ($user_data) {
+ $info[1][0] = get_string("messages","chat");
+ if ($ids = chat_message_ids_by_course ($course)) {
+ $info[1][1] = count($ids);
+ } else {
+ $info[1][1] = 0;
+ }
+ }
+ return $info;
+ }
+
+
+
+
+
+
+ // INTERNAL FUNCTIONS. BASED IN THE MOD STRUCTURE
+
+ //Returns an array of chats id
+ function chat_ids ($course) {
+
+ global $CFG;
+
+ return get_records_sql ("SELECT c.id, c.course
+ FROM {$CFG->prefix}chat c
+ WHERE c.course = '$course'");
+ }
+
+ //Returns an array of assignment_submissions id
+ function chat_message_ids_by_course ($course) {
+
+ global $CFG;
+
+ return get_records_sql ("SELECT m.id , m.chatid
+ FROM {$CFG->prefix}chat_messages m,
+ {$CFG->prefix}chat c
+ WHERE c.course = '$course' AND
+ m.chatid = c.id");
+ }
+?>

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