vb.net保存在phpmyadmin空值返回

Question

我是新的vb.net，sql甚至记录在phpmyadmin中的数据。当我使用我的界面添加记录时，我检查了我的phpmyadmin，它指示表中有一个条目，表示我的vb.net和phpmyadmin已连接，但值返回NULL。我怎样才能让它不是NULL？相反，记录所需的数据？

这是我的代码：

Dim ServerString As String = "Server=localhost; database=patientinfo;user id=root;password=" 
Dim SQLConnection As New MySqlConnection() 

Public Sub SaveInfos(ByRef SQLStatement As String) 
    Dim cmd As MySqlCommand = New MySqlCommand 

    With cmd 
     .CommandText = SQLStatement 
     .CommandType = CommandType.Text 
     .Connection = SQLConnection 
     .ExecuteNonQuery() 

    End With 
    SQLConnection.Close() 

    'MsgBox("Successfully Added!") 
    MsgBox("Successfully Saved") 
    Me.Visible = False 
    Mainform.Show() 

    SQLConnection.Dispose() 
End Sub 

Private Sub cmdSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdSave.Click 
    Try 
     '===========================Add New Patient======================================== 
     bednumber = txtbednum.Text 
     patient_name = txtName.Text 
     patient_age = Convert.ToInt32(txtAge.Text) 
     date_of_confinement = Date.Parse(dtpDate.Value) 
     type_of_sickness = txtSickness.Text 
     type_of_IV_fluid = txtFluid.Text 
     number_of_bottles = Convert.ToInt32(txtBottle.Text) 
     drop_rate = Convert.ToInt32(txtDrop.Text) 

     'To check if all values have been filled up 
     If patient_name = "" Or patient_age = "" Or date_of_confinement = "" _ 
     Or type_of_sickness = "" Or type_of_IV_fluid = "" Or number_of_bottles = "" Or drop_rate = "" _ 
     Then 

      MsgBox("Please Complete All the Required Fields") 

     Else 

      Dim SQLStatement As String = "INSERT INTO patient(bednumber, name, age, date_of_confinement,type_of_sickness, type_of_IV_fluid, number_of_bottles, drop_rate) VALUES(@bednumber, @name, @age, @date_of_confinement, @type_of_sickness, @type_of_IV_fluid, @number_of_bottles, @drop_rate)" 
      SaveInfos(SQLStatement) 

这就是我的表看起来像在phpMyAdmin：

http://i1182.photobucket.com/albums/x454/catherinefbalauro/Untitled.png

任何帮助，将不胜感激。谢谢！ :)

Answer 1

做这样的事情：

' Assuming that your SQLStatement is as follow 
' INSERT INTO MyTableName 
' VALUES ( @bednumber, @name, @age, 
'   @date_of_confinement,@type_of_sickness, 
'   @type_of_IV_fluid, @number_Of_Bottles, 
'   @drop_rate 
'  ) 
With cmd 
    .CommandText = SQLStatement 
    .CommandType = CommandType.Text 
    .Connection = SQLConnection 

    .Parameters.AddWithValue("@bednumber", txtbednum.Text) 
    .Parameters.AddWithValue("@name", txtName.Text) 
    .Parameters.AddWithValue("@age", txtAge.Text) 
    ' dothe same until 
    ' you have added allthe parameter 
    ' with values 

    SQLConnection.Open() 
    .ExecuteNonQuery() 
End With