我已附上代码以供引用。我正在尝试为我的项目详细信息创建数据库。我目前有 2 种形式:
- 主窗体
- 项目详细信息表
主窗体用于切换各种窗体
项目详细信息表单用于添加/编辑/加载项目详细信息
我在 visual basic 中的主窗体是这样的。
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
End Sub
Private Sub Bt_Project_Details_Click(sender As Object, e As EventArgs) Handles Bt_Project_Details.Click
Me.Hide()
Project_Details_Form.Show()
End Sub
End Class
我的项目详细信息表单如下所示。
Public Class Project_Details_Form
Private Sub Project_Details_Form_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'Project_Data_Set.Project_Data_Table' table. You can move, or remove it, as needed.
Me.Project_Data_TableTableAdapter.Fill(Me.Project_Data_Set.Project_Data_Table)
End Sub
Private Sub Bt_Load_Project_Click(sender As Object, e As EventArgs) Handles Bt_Load_Project.Click
End Sub
Private Sub Bt_Cancel_Click(sender As Object, e As EventArgs) Handles Bt_Cancel.Click
Me.Hide()
Form1.Show()
End Sub
Private Sub BindingNavigatorAddNewItem_Click(sender As Object, e As EventArgs) Handles BindingNavigatorAddNewItem.Click
Project_Data_TableBindingSource.AddNew()
End Sub
Private Sub Project_Data_TableBindingNavigatorSaveItem_Click(sender As Object, e As EventArgs) Handles Project_Data_TableBindingNavigatorSaveItem.Click
Me.Validate()
Me.Project_Data_TableBindingSource.EndEdit()
Me.TableAdapterManager.UpdateAll(Me.Project_Data_Set)
End Sub
Private Sub BindingNavigatorDeleteItem_Click(sender As Object, e As EventArgs) Handles BindingNavigatorDeleteItem.Click
Project_Data_TableBindingSource.RemoveCurrent()
End Sub
Private Sub FillByToolStripButton_Click(sender As Object, e As EventArgs)
Try
Me.Project_Data_TableTableAdapter.FillBy(Me.Project_Data_Set.Project_Data_Table)
Catch ex As System.Exception
System.Windows.Forms.MessageBox.Show(ex.Message)
End Try
End Sub
End Class
现在我面临着几个问题:
每当我运行程序时,尝试输入正在保存但值为空的第一个条目数据。下次输入的数据妥善保存。如何让我的第一个条目可见?
在下面的代码中:
Private Sub BindingNavigatorAddNewItem_Click(sender As Object, e As EventArgs) Handles BindingNavigatorAddNewItem.Click Project_Data_TableBindingSource.AddNew() End Sub
我正在使用
AddNew()
。这工作正常,但问题是即使我不输入日期之类的数据,名称保持为空,记录在他们位置的数据仅存储为空。我想说的是,如果任何项目数据集为空,则给出错误消息(因为用户必须输入这些数据)
最佳答案
有没有其他方法可以单独赋值。 就像我的项目数据库包含项目名称、客户名称等。如果我说按下新按钮清除所有字段。一旦按下保存按钮,填写表格后将记录单个值
Private Sub BindingNavigatorAddNewItem_Click(sender As Object, e As EventArgs) Handles BindingNavigatorAddNewItem.Click
Project_Data_TableBindingSource.AddNew()
End Sub
关于database - 更新数据库的问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32307281/