OpenEuphoria

2. Re: Rock Band Clone - Update

• Posted by petelomax Nov 29, 2011
• 1406 views

Yeah, that needs rewriting. Get into the habit of saving the result codes from db_open etc so you can perform >1 test on them and optionally display the error code in a message.

You want to try and open the database, and if it does not exist, then try and create it, not the other way round. Below is an unaltered copy of the Edita db routine. (As an example only, there is code here that you certainly won't need.)

procedure initEditaEdb() 
-- 
-- open/create the edita database 
-- 
sequence tlist 
object exh 
integer errCode 
sequence Fkey 
 
    errCode = db_open(initialcurrentdir&editaEDB,DB_LOCK_EXCLUSIVE) 
    if errCode!=DB_OK then 
        if errCode = DB_LOCK_FAIL then 
            void = proemh("Error","edita.edb locked, aborting",0)  abort(0) 
        elsif db_create(initialcurrentdir&editaEDB,DB_LOCK_EXCLUSIVE)!=DB_OK then 
            void = proemh("Error","error creating edita.edb",0)  ?9/0 
        end if 
    end if 
    isOpen = 1 
 
    tlist = db_table_list() 
    for i=1 to length(Tset) do 
        if not find(Tset[i],tlist) then 
            if i=1 then --"version" not present; delete the lot. (pre 0.2.0) 
                for j=1 to length(tlist) do 
                    db_delete_table(tlist[j]) 
                end for 
                tlist = {} 
            end if 
            if db_create_table(Tset[i])!=DB_OK then 
                DBfatal("error creating "&Tset[i]&" table",CRASHALWAYS) 
            elsif i=1 then 
--              if db_insert(1,{0,2,0})!=DB_OK then 
                if db_insert(1,{0,3,3})!=DB_OK then 
                    DBfatal("error inserting version record",CRASHALWAYS) 
                end if 
            end if 
        end if 
    end for 
 
    -- 
    -- get the version 
    -- 
    SelectTable(Tversion) 
    dbversion = db_record_data(1) 
    if compare(dbversion,{0,3,3})<0 then 
        -- 0.2.0 (pre 0.3.3/usegpp) 
        needVedb = 1 
        -- (Tversion is [eventually] set to {0,3,3} by vedb.exw) 
    end if 
    -- 
    -- Plug in the elng_xxx.exh file for automatic builtin load... 
    -- 
    exh = getexhname() 
    if sequence(exh) then 
        void = logFile(exh[1],exh[2],0) -- ie add to background task list ) 
    end if 
 
    -- 
    -- Load the default macros now 
    --  (A macro saved as eg "F7default" [by editing the top box] will load as 
    --   the default for F7, whereas "F7" is "this session only". Note that it 
    --   handles multiple macros starting F7 alphabetically, so if you defined 
    --   both "F7default" and "F7zzz", the latter would override the former. 
    --   Of course macros can hold something named eg "paste and find next", 
    --   which will only be available after manually assigning it to a key.) 
    -- 
    MacroKeys = repeat({},4) 
    SelectTable(Tmacros) 
    for i=1 to db_table_size() do 
        Fkey = db_record_key(i) 
        if length(Fkey)>2 then 
            if Fkey[1]>'F' then exit end if 
            if Fkey[1]='F' then 
                if Fkey[2]>'9' then exit end if 
                if Fkey[2]>='6' then 
                    MacroKeys[Fkey[2]-'5'] = db_record_data(i) 
                end if 
            end if 
        end if 
    end for 
    DBclose() 
 
end procedure 

HTH, Pete

4. Re: Rock Band Clone - Update

• Posted by ghaberek (admin) Nov 29, 2011
• 1414 views

To extend Pete's comments, here are the typical wrapper functions I use all the time. I especially like db_auto_insert() which auto-numbers the key field for quick-and-dirty insert operations. Also, you may want to consider Matt's EuSQL on a project of this size.

global function db_load( sequence name, integer mode = DB_LOCK_EXCLUSIVE ) 
     
    integer retval 
     
    retval = db_select( name ) 
    if retval = DB_OK then 
        return retval 
    end if 
     
    retval = db_open( name, mode ) 
    if retval = DB_OK or retval = DB_LOCK_FAIL then 
        return retval 
    end if 
     
    return db_create( name, mode ) 
end function 
 
global function db_load_table( sequence name ) 
     
    integer retval 
     
    retval = db_select_table( name ) 
    if retval = DB_OK then 
        return retval 
    end if 
     
    return db_create_table( name ) 
end function 
 
global function db_auto_insert( object data ) 
     
    integer count, key 
    count = db_table_size() 
     
    if count > 0 then 
        key = db_record_key( count ) 
    else 
        key = 0 
    end if 
     
    return db_insert( key + 1, data ) 
end function 

-Greg

6. Re: Rock Band Clone - Update

• Posted by ghaberek (admin) Nov 29, 2011
• 1277 views

How's this?

if db_select(SongDB) != DB_OK then 
     
    puts(1,"Could not select database\n") 
     
    if db_open(SongDB, DB_LOCK_NO) != DB_OK then 
         
        puts(1,"Could not open database\n") 
         
        if db_create(SongDB, DB_LOCK_NO) != DB_OK then 
             
            puts(1,"Database could not be created\n") 
            abort(1) 
             
        end if 
         
    end if 
     
end if 
 
if db_select_table(SongTable) != DB_OK then 
     
    puts(1,"Could not select table\n") 
     
    if db_create_table(SongTable) != DB_OK then 
         
        puts(1,"Could not create table\n") 
        abort(1) 
         
    end if 
     
end if 
 
if db_insert(song_title,{SONG_TITLE}) != DB_OK then 
     
    puts(1,"Could not insert song table\n") 
    abort(1) 
     
end if 
 
db_close(SongDB) 

-Greg

8. Re: Rock Band Clone - Update

• Posted by DerekParnell (admin) Nov 30, 2011
• 1354 views

This might help...

include std/eds.e 
 
sequence SongDB = "songs.edb" 
sequence SongTable = "song" 
atom song_id 
sequence song_data 
integer idkey 
 
if db_select(SongDB) != DB_OK then  
    if db_open(SongDB, DB_LOCK_NO) != DB_OK then  
        if db_create(SongDB, DB_LOCK_NO) != DB_OK then  
            puts(1,"Database could not be created\n")  
            abort(1)  
        end if  
    end if  
	db_select(SongDB) -- Select the database after open/create 
      
end if  
 
  
if db_select_table(SongTable) != DB_OK then  
    if db_create_table(SongTable) != DB_OK then  
          
        puts(1,"Could not create table\n")  
        abort(1)  
          
    end if  
	db_select_table(SongTable) -- Select the table after create. 
      
end if  
 
-- example data  
song_data = {"I Wanna Hold Your Hand", "The Beatles", {1963,10,17}, {"rock","pop"},"Lennon/McCartney"} 
-- Generate a unique ID for this song. 
song_id = hash(song_data[1..3], SongTable) 
 
idkey = db_find_key( song_id ) 
if idkey < 0 then 
	if db_insert(song_id,{song_data}) != DB_OK then  
      
    	puts(1,"Could not insert song table\n")  
    	abort(1)  
    else 
       	printf(1, " Song ID: %d added.\n", song_id) 
    end if 
else 
	song_data = db_record_data(idkey) 
   	printf(1, " Song ID: %d\n", song_id) 
   	if length(song_data) = 1 then 
   		song_data = song_data[1] 
	   	printf(1, "   Title: %s\n", {song_data[1]}) 
	   	printf(1, "  Artist: %s\n", {song_data[2]}) 
	   	printf(1, "Recorded: %02dd%02dm%4d\n", {song_data[3][3],song_data[3][2],song_data[3][1]}) 
	   	printf(1, "Composer: %s\n", {song_data[5]}) 
	   	if length(song_data[4]) > 0 then 
	   		puts(1, "   Genre: ") 
	   		for i = 1 to length(song_data[4]) do 
	   			printf(1, "%s ", {song_data[4][i]}) 
	   		end for 
	   		puts(1, "\n") 
	   	end if 
	else 
		puts(1, "data no longer exists\n") 
	end if   	 
end if 
 
db_close()  

10. Re: Rock Band Clone - Update

• Posted by Lone_EverGreen_Ranger Nov 30, 2011
• 1271 views

include std/eds.e 
 
sequence SongDB = "songs.edb" 
sequence SongTable = "song" 
atom song_id 
sequence song_data 
integer idkey 
 
if db_select(SongDB) != DB_OK then  
    if db_open(SongDB, DB_LOCK_NO) != DB_OK then  
        if db_create(SongDB, DB_LOCK_NO) != DB_OK then  
            puts(1,"Database could not be created\n")  
            abort(1)  
        end if  
    end if  
	db_select(SongDB) -- Select the database after open/create 
      
end if  
 
  
if db_select_table(SongTable) != DB_OK then  
    if db_create_table(SongTable) != DB_OK then  
          
        puts(1,"Could not create table\n")  
        abort(1)  
          
    end if  
	db_select_table(SongTable) -- Select the table after create. 
      
end if  
 
-- example data  
song_data = {"I Wanna Hold Your Hand", "The Beatles", {1963,10,17}, {"rock","pop"},"Lennon/McCartney"} 
-- Generate a unique ID for this song. 
song_id = hash(song_data[1..3], SongTable) 
 
idkey = db_find_key( song_id ) 
if idkey < 0 then 
	if db_insert(song_id,{song_data}) != DB_OK then  
      
    	puts(1,"Could not insert song table\n")  
    	abort(1)  
    else 
       	printf(1, " Song ID: %d added.\n", song_id) 
    end if 
else 
	song_data = db_record_data(idkey) 
   	printf(1, " Song ID: %d\n", song_id) 
   	if length(song_data) = 1 then 
   		song_data = song_data[1] 
	   	printf(1, "   Title: %s\n", {song_data[1]}) 
	   	printf(1, "  Artist: %s\n", {song_data[2]}) 
	   	printf(1, "Recorded: %02dd%02dm%4d\n", {song_data[3][3],song_data[3][2],song_data[3][1]}) 
	   	printf(1, "Composer: %s\n", {song_data[5]}) 
	   	if length(song_data[4]) > 0 then 
	   		puts(1, "   Genre: ") 
	   		for i = 1 to length(song_data[4]) do 
	   			printf(1, "%s ", {song_data[4][i]}) 
	   		end for 
	   		puts(1, "\n") 
	   	end if 
	else 
		puts(1, "data no longer exists\n") 
	end if   	 
end if 
 
db_close()  

Thanks Derek, this looks really useful. The only thing is how would I make it so that you can add custom songs?

12. Re: Rock Band Clone - Update

• Posted by Lone_EverGreen_Ranger Nov 30, 2011
• 1245 views

function add_new_record(sequence TableName, sequence RecordFields, integer IDFldLow, integer IDFldHigh) 
    object record_key 
    integer record_id 
    integer dbres 
 
    dbres = db_select_table(TableName) 
    if dbres != DB_OK then 
        return {1, "Table not found", dbres} 
    end if 
 
    record_key = RecordFields[IDFldLow..IDFldHigh] 
    record_key = hash(record_key, TableName) & hash(record_key, record_key) 
    record_id = db_find_key(record_key) 
    if record_id < 0 then 
        dbres = db_insert(record_key, RecordFields) 
        if dbres != DB_OK then 
            return {2, "DB Insert failed", dbres} 
        else 
            return {0, -record_id} -- insert success, return new record's id. 
        end if 
    else 
        return {3, record_id} -- already in db, return record's id. 
    end if 
end function 
 
object SongData 
sequence res 
while 1 do 
    SongData = Get_Song_Details() 
    if atom(SongData) then 
        exit 
    end if 
    res = add_new_record(SongTable, SongData, 1, 3) 
    if res[1] != 0 then 
        Handle_Error(res, SongTable, SongData) 
    end if 
end while 
 
 

Thanks. I'll work with it tonight.