keep working on the like button

server/src/db.cpp

@@ -154,6 +154,22 @@ void Database::addPost(const Post& post) {
     sqlite3_finalize(stmt);
 }
 
+void Database::addLike(uint64_t postId, uint64_t userId) {
+    std::stringstream sql;
+    sql << R"(
+        UPDATE posts 
+        SET likes = likes + 1
+        WHERE id =
+    )";
+    sql << postId << ";";
+    std::string sqlstr = sql.str();
+
+    char* errmsg = nullptr;
+    if (sqlite3_exec(db, sqlstr.c_str(), nullptr, nullptr, &errmsg) != SQLITE_OK) {
+        throw std::runtime_error("sqlite3 error: " + std::string(errmsg));
+    }
+}
+