HttpClient在Angular中发布问题

Question

我正在使用Web api开发Angular应用。

我创建了一个服务（sellerService），可以在其中使用HttpClient put更新数据库中的某些数据。

以上工作正常，但它更新了我表的所有数据，如下所示；

在我更新卖家之前：

更新卖家后

我的卖家服务代码：

  updateSeller(user: string, nbsales: number, pVote: number, nVote: number, idUser: number): Observable<any> {
      return this.http.put('http://localhost:50867/api/seller_user/', {
        'username': user,
        'nbSales': nbsales,
        'positiveVote': pVote,
        'negativeVote': nVote,
        'idUser': idUser
      });
    }

我的更新查询（DAO（c＃））：

public static readonly string UPDATE = "update " + TABLE_NAME + " set "
            + COLUMN_USERNAME + " =@username"
            + ", " + COLUMN_NB_SALES + "=@nbSales"
            + ", " + COLUMN_POSITIVE_VOTE + "=@positiveVote"
            + ", " + COLUMN_NEGATIVE_VOTE + " =@negativeVote"
            + ", " + COLUMN_ID_USER + "=@idUser";

        //Update a seller_user
        public static bool Update(Seller_user todo)
        {
            bool state = false;
            using (SqlConnection connection = DataBase.GetConnection())
            {
                connection.Open();
                SqlCommand command = new SqlCommand(UPDATE, connection);

                //command.Parameters.AddWithValue("@idSeller", todo.idSeller);
                command.Parameters.AddWithValue("@username", todo.username);
                command.Parameters.AddWithValue("@nbSales", todo.nbSales);
                command.Parameters.AddWithValue("@positiveVote", todo.positiveVote);
                command.Parameters.AddWithValue("@negativeVote", todo.negativeVote);
                command.Parameters.AddWithValue("@idUser", todo.idUser);

                state = command.ExecuteNonQuery() != 0;
            }
            return state;
        }

预先感谢;）

Answer 1

您错过了SQL查询中的where子句。因此它将更新所有记录。

public static readonly string UPDATE = "update " + TABLE_NAME + " set "
            + COLUMN_USERNAME + " =@username"
            + ", " + COLUMN_NB_SALES + "=@nbSales"
            + ", " + COLUMN_POSITIVE_VOTE + "=@positiveVote"
            + ", " + COLUMN_NEGATIVE_VOTE + " =@negativeVote"
            + ", " + COLUMN_ID_USER + "=@idUser"
            + "WHERE "  + COLUMN_ID_USER + "=" + "= @idUser";