如何在數據庫上設置我的NumericUpDown

Question

例如，我的表中的我的Item_Quantity是50, 那麼我的NumericUpDown的最小值將是1和50？ 即時通訊使用C＃和MySQL，我不能讓它工作。

編輯：

這是我的代碼：

string MyConnectionString = "Server=localhost;Port=3307;database=invpos;Uid=root;Pwd=''"; 

    public void LoadGrid() 
    { 
     MySqlConnection connection = new MySqlConnection(MyConnectionString); 
     connection.Open(); 

     try 
     { 
      MySqlCommand cmd = connection.CreateCommand(); 
      cmd.CommandText = "Select * from items"; 
      MySqlDataAdapter adap = new MySqlDataAdapter(cmd); 
      DataSet ds = new DataSet(); 
      adap.Fill(ds); 
     } 
     catch (Exception) 
     { 
      throw; 
     } 
     finally 
     { 
      if (connection.State == ConnectionState.Open) 
      { 
       connection.Clone(); 
      } 
     } 
    } 

    public void ComboBox() 
    { 
     MySqlConnection connection = new MySqlConnection(MyConnectionString); 
     connection.Open();   
     MySqlCommand cmd = connection.CreateCommand(); 
     MySqlDataAdapter adap = new MySqlDataAdapter("Select Item_Name from items", connection); 
     DataSet ds = new DataSet(); 
     adap.Fill(ds); 
     comboBox1.DataSource = ds.Tables[0]; 
     comboBox1.DisplayMember = "Item_Name"; 
    }  
    private void Form4_Load(object sender, EventArgs e) 
    { 
     LoadGrid(); 
     ComboBox(); 

    } 

我希望有人能幫助我:(

Answer 1

這是我希望發生的：例如：數據庫：Item_Quantity = 50，我想將我的NumericUpDown的最大值設置爲Item_Quantity的值:(

據我所知，您不知道如何獲得NumericUpDown的最大值？

試試這個：

int itemQuantity = numericUpDown1.Maximum; //Get maximum value of `NumericUpDown` 
int currentValue = numericUpdown1.Value; //Get current value of `NumericUpDown` 

它是否解決問題了嗎？

*更新

try 
{ 
    MySqlCommand cmd = connection.CreateCommand(); 
    cmd.CommandText = "Update <your table> set <column> = " + itemQuantity; 
    //Use Command Parameter will be better. 
    cmd.executeNonQuery(); //execute update. 
} 
catch (Exception ex) 
{ 
    //Catch exception 
}