Question

我有一张名为Town的桌子，它掌握着玩家和玩家建筑物之间的关系。该表包含以下列： userid（int） buildingid（int） number（int）

我已成功为玩家插入新建筑物，现在我无法更新播放器的特定行。

我有这段代码：

if (!existPlayerBuilding(userid, buildingid))
            {
                SqlConnection sqlcon = new SqlConnection(connectionString);
                string query = "INSERT INTO Town VALUES(@userid, @buildingid, @number)";
                SqlCommand sqlcom = new SqlCommand(query, sqlcon);

                sqlcom.Parameters.Add("@userid", userid);
                sqlcom.Parameters.Add("@buildingid", buildingid);
                sqlcom.Parameters.Add("@number", number);

                try
                {
                    sqlcon.Open();
                    sqlcom.ExecuteNonQuery();
                    sqlcon.Close();
                }
                catch (Exception i)
                {
                    lblTestlabel.Text = "SQL FEILET";
                }
                lblTestlabel.Text = "Bygningen ble kjøpt!!!!";
            }
            else
            {
                SqlConnection sqlcon = new SqlConnection(connectionString);
                string query = "UPDATE Town VALUES(@userid, @buildingid, @number) WHERE userid = @userid AND buildingid = @buildingid";
                SqlCommand sqlcom = new SqlCommand(query, sqlcon);

                sqlcom.Parameters.Add("@userid", userid);
                sqlcom.Parameters.Add("@buildingid", buildingid);
                sqlcom.Parameters.Add("@number", number);

                try
                {
                    sqlcon.Open();
                    sqlcom.ExecuteNonQuery();
                    sqlcon.Close();
                }
                catch (Exception i)
                {
                    lblTestlabel.Text = "SQL FEILET";
                }
                lblTestlabel.Text = "Bygningen ble kjøpt!!!!";
            }

如果玩家已经拥有具有给定id的建筑物，则existsPlayerBuilding方法返回true，否则返回false。当我运行并测试我是否可以为用户构建更新号码时没有任何反应。

Answer 1

SQL中的更新语法为

UPDATE Town
SET number = @number 
WHERE userid = @userid AND buildingid = @buildingid

Answer 2

您的更新查询错误：

UPDATE Town
SET number = @number
WHERE userid = @userid AND buildingid = @buildingid

无法在SQL中更新表c＃

2 个答案: