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<?PHP //$Id: backuplib.php,v 1.2 2004/02/24 15:45:01 stronk7 Exp $
//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 ($bf,full_tag("GROUPID",6,false,$cha_mes->groupid));
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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