Question

我正在尝试更新名为＆＃39; schedulle＆＃39;的表格中的数据。但每次控制转到包含double值的条件语句时，我都会收到错误：

数据截断列＆＃39;总计＆＃39;在第1行和第34行;串

我在下面的代码中收到此错误：

//Insert Data in Schedule
                    foreach (ScheduleData item in schedUpdate)
                    {
                        query = "UPDATE schedulle SET "
                            +" sch_day='"+ item.DayOfWeek + "',morning='"+ item.Morning + "',evening='"+ item.Evening + "',total='@t' WHERE emp_id_fk='"+global_ID+"'";
                        command = new MySqlCommand(query, connection, transaction);
                        if (item.Morning.Equals("set") && item.Evening.Equals("set"))
                        {
                            command.Parameters.AddWithValue("@t", 5.0);
                        }
                        if (item.Morning.Equals("set") && item.Evening.Equals("unset"))
                        {
                            command.Parameters.AddWithValue("@t", Convert.ToDouble(2.5));
                        }
                        if (item.Morning.Equals("unset") && item.Evening.Equals("set"))
                        {
                            command.Parameters.AddWithValue("@t", 2.5);
                        }
                        if (item.Morning.Equals("unset") && item.Evening.Equals("unset"))
                        {
                            command.Parameters.AddWithValue("@t", 0);
                        }
                        command.ExecuteNonQuery();
                    }
                    transaction.Commit();

                }
                catch (Exception ex)
                {
                    transaction.Rollback();
                    MessageBox.Show(ex.Message);
                }
                finally
                {
                    connection.Close();
                }
            }

我的数据库架构如下：

CREATE TABLE payroll_db.schedulle (
  sch_id INT(11) NOT NULL AUTO_INCREMENT,
  emp_id_fk INT(11) NOT NULL,
  sch_day VARCHAR(10) NOT NULL,
  morning VARCHAR(10) NOT NULL DEFAULT 'unset',
  evening VARCHAR(10) NOT NULL DEFAULT 'unset',
  total DOUBLE(10, 3) NOT NULL,
  PRIMARY KEY (sch_id),
  INDEX emp_id_fk (emp_id_fk),
  CONSTRAINT schedulle_ibfk_1 FOREIGN KEY (emp_id_fk)
    REFERENCES payroll_db.employee(emp_id) ON DELETE CASCADE ON UPDATE CASCADE
)
ENGINE = INNODB
AUTO_INCREMENT = 64
AVG_ROW_LENGTH = 2340
CHARACTER SET ascii
COLLATE ascii_general_ci
ROW_FORMAT = DYNAMIC;

此外，＆＃39;项目＆＃39;是ScheduleData类的实例。 ScheduleData类在下面提到：

public class ScheduleData : INotifyPropertyChanged
        {

            private string dayOfWeek;
            public string DayOfWeek
            {
                get { return dayOfWeek; }
                set
                {
                    if (dayOfWeek != value)
                    {
                        dayOfWeek = value;
                        OnPropertyChanged("DayOfWeek");
                    }
                }
            }

            private string morning = "unset";
            public string Morning
            {
                get { return morning; }
                set
                {
                    if (morning != value)
                    {
                        morning = value;
                        OnPropertyChanged("Morning");
                    }
                }
            }

            private string evening = "unset";
            public string Evening
            {
                get { return evening; }
                set
                {
                    if (evening != value)
                    {
                        evening = value;
                        OnPropertyChanged("Evening");
                    }
                }
            }

            private double total;
            public double Total
            {
                get { return total; }
                set
                {
                    if(total != value)
                    {
                        total = value;
                        OnPropertyChanged("Total");
                    }
                }
            }


            public event PropertyChangedEventHandler PropertyChanged;
            protected void OnPropertyChanged(string propertyName)
            {
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
            }
        }

＆＃39; SchedUpdate＆＃39;财产如下：

private List<ScheduleData> schedUpdate;
        public List<ScheduleData> SchedUpdate
        {
            get
            {
                return schedUpdate;
            }
            set
            {
                if (schedUpdate != value)
                {
                    schedUpdate = value;
                    OnPropertyChanged("SchedUpdate");
                }
            }
        }

我想我已经分享了有关我收到错误的代码的最大细节。请帮助解决此错误。

Answer 1

您在参数名称qoutes周围提供了@t，这不是必需的。从查询@t

中的total=@t移除qoutes

也不要在查询中使用参数化Sql连接值，就像添加参数@t

的值一样

＆＃34;数据被截断＆＃34; C＃

1 个答案: