/
iter.c
218 lines (173 loc) · 4.67 KB
/
iter.c
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// Copyright (c) 2014 Kevin Martin
struct queryuserdata {
sqlite3_stmt *stmt;
int assockey;
int intkey;
};
static int queryuserdata_mtgc(lua_State *l) {
lua_settop(l, 1); //[u]
assert(lua_type(l, 1) == LUA_TUSERDATA);
struct queryuserdata *ud =
(struct queryuserdata *)lua_touserdata(l, 1);
assert(ud != NULL);
if(ud->stmt != NULL) {
sqlite3_finalize(ud->stmt);
ud->stmt = NULL;
}
return 0;
}
static int queryuserdata_mtcall(lua_State *l) {
lua_settop(l, 1); //[u]
assert(lua_type(l, 1) == LUA_TUSERDATA);
struct queryuserdata *ud =
(struct queryuserdata *)lua_touserdata(l, 1);
assert(ud != NULL);
if(ud->stmt == NULL) {
lua_pushnil(l); //[u_]
return 1;
}
int rc = sqlite3_step(ud->stmt);
if(rc == SQLITE_DONE) {
sqlite3_finalize(ud->stmt);
ud->stmt = NULL;
lua_pushnil(l); //[u_]
return 1;
}
if(rc != SQLITE_ROW) {
lua_pushfstring(l,
"Failed to execute statement: %s",
sqlite3_errmsg(sqlite3_db_handle(ud->stmt)));
sqlite3_finalize(ud->stmt);
ud->stmt = NULL;
return lua_error(l);
}
assert(rc == SQLITE_ROW);
lua_newtable(l); //[ut]
int col = sqlite3_column_count(ud->stmt) - 1;
while(col >= 0) {
switch(sqlite3_column_type(ud->stmt, col)) {
case SQLITE_NULL:
lua_pushnil(l);
break;
case SQLITE_INTEGER:
case SQLITE_FLOAT:
lua_pushnumber(l, sqlite3_column_double(ud->stmt, col));
break;
case SQLITE_TEXT:
lua_pushlstring(l,
(const char *)sqlite3_column_text(ud->stmt, col),
sqlite3_column_bytes(ud->stmt, col));
break;
case SQLITE_BLOB:
lua_pushlstring(l,
(const char *)sqlite3_column_blob(ud->stmt, col),
sqlite3_column_bytes(ud->stmt, col));
break;
default:
assert(0);
return luaL_error(l, "Logic Error: unknown col type");
}
//[ut?]
lua_pushvalue(l, -1); //[ut??]
if(ud->intkey) {
lua_rawseti(l, -3, col+1); //[ut?]
} else {
lua_pop(l, 1); //[ut?]
}
if(ud->assockey) {
lua_setfield(l, -2, sqlite3_column_name(ud->stmt, col)); //[ut]
} else {
lua_pop(l, 1); //[ut]
}
--col;
}
return 1;
}
//sets the db metatable on the userdata, and returns the userdata
static int queryuserdata_setmt(lua_State *l) {
lua_settop(l, 1); //[u]
assert(lua_type(l, 1) == LUA_TUSERDATA);
assert(lua_getmetatable(l, 1) == 0);
lua_rawgetp(l, LUA_REGISTRYINDEX, (void *)queryuserdata_setmt);
if(lua_type(l, -1) == LUA_TNIL) {
//[u_]
lua_pop(l, 1); //[u]
lua_newtable(l); //[ut]
lua_pushcfunction(l, queryuserdata_mtcall); //[utf]
lua_setfield(l, -2, "__call"); //[ut]
lua_pushcfunction(l, queryuserdata_mtgc); //[utf]
lua_setfield(l, -2, "__gc"); //[ut]
lua_pushvalue(l, -1); //[utt]
lua_rawsetp(l, LUA_REGISTRYINDEX, (void *)queryuserdata_setmt); //[ut]
}
assert(lua_type(l, -1) == LUA_TTABLE);
lua_setmetatable(l, -2); //[u]
return 1;
}
static int queryuserdata_create(lua_State *l) {
//the dbud, queryobj, params, assoc
lua_settop(l, 4); //[uttb]
assert(lua_type(l, 1) == LUA_TUSERDATA);
luaL_checktype(l, 2, LUA_TTABLE);
luaL_checktype(l, 3, LUA_TTABLE);
luaL_checktype(l, 4, LUA_TBOOLEAN);
struct dbuserdata *uddb =
(struct dbuserdata *)lua_touserdata(l, 1);
assert(uddb != NULL);
assert(uddb->db != NULL);
struct queryuserdata *ud = //[uttbu]
(struct queryuserdata *)lua_newuserdata(l, sizeof(struct queryuserdata));
assert(ud != NULL);
ud->stmt = NULL;
if(lua_toboolean(l, 4)) {
ud->assockey = 1;
ud->intkey = 0;
} else {
ud->assockey = 0;
ud->intkey = 1;
}
lua_remove(l, 4); //[uttu]
lua_pushcfunction(l, queryuserdata_setmt); //[uttuf]
lua_insert(l, 4); //[uttfu]
lua_call(l, 1, 1); //[uttu]
lua_getfield(l, 2, "_fullquery"); //[uttus]
int rc = sqlite3_prepare_v2(uddb->db, lua_tostring(l, 5),
-1, &ud->stmt, NULL);
if(rc != SQLITE_OK) {
return luaL_error(l, "Failed to parse SQL '%s': %s",
lua_tostring(l, 5), sqlite3_errmsg(uddb->db));
}
lua_pop(l, 1); //[uttu]
lua_pushvalue(l, 2); //[uttut]
lua_setuservalue(l, -2); //[uttu]
lua_remove(l, 2); //[utu];
//the db is held by the query (the user value)
lua_remove(l, 1); //[tu]
lua_insert(l, 1); //[ut]
//Bind the parameters
lua_getfield(l, -1, "n"); //[utn]
assert(lua_type(l, -1) == LUA_TNUMBER);
int n = lua_tointeger(l, -1);
lua_pop(l, 1); //[ut]
while(n > 0) {
lua_rawgeti(l, -1, n); //[ut?]
switch(lua_type(l, -1)) {
case LUA_TNIL:
sqlite3_bind_null(ud->stmt, n);
break;
case LUA_TSTRING:
sqlite3_bind_text(ud->stmt, n, lua_tostring(l, -1),
-1, SQLITE_TRANSIENT);
break;
case LUA_TNUMBER:
sqlite3_bind_double(ud->stmt, n, lua_tonumber(l, -1));
break;
default:
return luaL_error(l, "Unable to bind parameter type");
}
--n;
lua_pop(l, 1); //[ut]
}
lua_pop(l, 1); //[u]
return 1;
}