ORDER BY random() with seed in SQLITE

Question

I would like to implement paging for a random set

Select * from Animals ORDER BY random(SEED) LIMIT 100 OFFSET 50  

I tried to set int to

Answer 1

I don't know if you're wanting a PHP and iOS solution, but if you are only interested in iOS and dont care much about using the built-in sqlite random() function, you could declare a custom function to use in your queries, one that does take a seed parameter.

sqlite3_create_function(database, "CUSTOM_RANDOM", 1, SQLITE_UTF8, NULL, &CustomRandomSQLite, NULL, NULL);

.

void CustomRandomSQLite(sqlite3_context* context, int argc, sqlite3_value** argv)
{
    if(argc == 1 && sqlite3_value_type(argv[0]) == SQLITE_INTEGER)
    {
        const int seed = sqlite3_value_int(argv[0]);
        const int result = ...;

        sqlite3_result_int(context, result);
    }
    else
    {
        sqlite3_result_error(context, "Invalid", 0);
    }
}

.

Select * from Animals ORDER BY CUSTOM_RANDOM(SEED) LIMIT 100 OFFSET 50