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Add a new database exchange function, because get and set aren't atomic enough.

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git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3861 ed5197a5-7fde-0310-b194-c3ffbd925b24
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Cory McWilliams
2022-03-16 00:34:45 +00:00
parent 5e0c20e432
commit 9b2d4b393d
1 changed files with 32 additions and 0 deletions
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32
src/database.js.c
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@@ -23,6 +23,7 @@ static void _database_finalizer(JSRuntime *runtime, JSValue value);
static JSValue _database_get(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv); static JSValue _database_get(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv);
static JSValue _database_set(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv); static JSValue _database_set(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv);
static JSValue _database_exchange(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv);
static JSValue _database_remove(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv); static JSValue _database_remove(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv);
static JSValue _database_get_all(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv); static JSValue _database_get_all(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv);
static JSValue _database_get_like(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv); static JSValue _database_get_like(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv);
@@ -72,6 +73,7 @@ static JSValue _database_create(JSContext* context, JSValueConst this_val, int a
JS_SetPropertyStr(context, object, "get", JS_NewCFunction(context, _database_get, "get", 1)); JS_SetPropertyStr(context, object, "get", JS_NewCFunction(context, _database_get, "get", 1));
JS_SetPropertyStr(context, object, "set", JS_NewCFunction(context, _database_set, "set", 2)); JS_SetPropertyStr(context, object, "set", JS_NewCFunction(context, _database_set, "set", 2));
JS_SetPropertyStr(context, object, "exchange", JS_NewCFunction(context, _database_exchange, "exchange", 2));
JS_SetPropertyStr(context, object, "remove", JS_NewCFunction(context, _database_remove, "remove", 1)); JS_SetPropertyStr(context, object, "remove", JS_NewCFunction(context, _database_remove, "remove", 1));
JS_SetPropertyStr(context, object, "getAll", JS_NewCFunction(context, _database_get_all, "getAll", 0)); JS_SetPropertyStr(context, object, "getAll", JS_NewCFunction(context, _database_get_all, "getAll", 0));
JS_SetPropertyStr(context, object, "getLike", JS_NewCFunction(context, _database_get_like, "getLike", 1)); JS_SetPropertyStr(context, object, "getLike", JS_NewCFunction(context, _database_get_like, "getLike", 1));
@@ -140,6 +142,36 @@ JSValue _database_set(JSContext* context, JSValueConst this_val, int argc, JSVal
return JS_UNDEFINED; return JS_UNDEFINED;
} }
static JSValue _database_exchange(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv)
{
JSValue exchanged = JS_UNDEFINED;
database_t* database = JS_GetOpaque(this_val, _database_class_id);
if (database)
{
sqlite3_stmt* statement;
if (sqlite3_prepare(database->db, "UPDATE properties SET value = $1 WHERE id = $2 AND key = $3 AND value = $4", -1, &statement, NULL) == SQLITE_OK)
{
size_t key_length;
size_t expected_length;
size_t set_length;
const char* key = JS_ToCStringLen(context, &key_length, argv[0]);
const char* expected = JS_ToCStringLen(context, &expected_length, argv[1]);
const char* set = JS_ToCStringLen(context, &set_length, argv[2]);
if (sqlite3_bind_text(statement, 1, set, set_length, NULL) == SQLITE_OK &&
sqlite3_bind_text(statement, 2, database->id, -1, NULL) == SQLITE_OK &&
sqlite3_bind_text(statement, 3, key, key_length, NULL) == SQLITE_OK &&
sqlite3_bind_text(statement, 4, expected, expected_length, NULL) == SQLITE_OK &&
sqlite3_step(statement) == SQLITE_DONE)
{
exchanged = sqlite3_changes(database->db) != 0 ? JS_TRUE : JS_FALSE;
}
JS_FreeCString(context, key);
sqlite3_finalize(statement);
}
}
return exchanged;
}
JSValue _database_remove(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv) JSValue _database_remove(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv)
{ {
database_t* database = JS_GetOpaque(this_val, _database_class_id); database_t* database = JS_GetOpaque(this_val, _database_class_id);