How does lua store data in a table?

["devfua" <devfua@...>]

Hi~ 

I use :

mydata["key1"] = "value1"

mydata["key2"] = "value2"

in a lua script.

and use :

    lua_getfield(L, -1, "mydata");

    if (lua_istable(L, -1)) {

        lua_pushnil(L);

        while (lua_next(L, -2) != 0) { 

            if (lua_isstring(L, -1) && lua_isstring(L, -2)) {

                const char *key, *val;

                size_t key_len, val_len;

                key = lua_tolstring(L, -2, &key_len);

                val = lua_tolstring(L, -1, &val_len);

                store_into_db("key", "value");

            }    

            lua_pop(L, 1);

        }    

    } 

in c program to get data.

I've found that the pop order is different from the order I put data in.

How does lua store data in a table and is there any way to get data in the order of putting them in ?

thanks