Question

我需要一些帮助来删除数据库中的记录。

我正在尝试从SQL Server数据库中的表中删除记录。

我错过了什么吗？

  Private Sub cmdDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdDelete.Click
     _DataSet.Tables(0).Rows(CInt(txtCurrent.Text) - 1).Delete()
     ' tho, it can remove the deleted rows
     ' we cannot call the DataSet.AcceptChanges method
     ' because the DataAdapter would not recognize the delete row
     ' by the time DataAdapter.Update(DataSet) is called.
     EnableNavigation()
     cmdSave.Enabled = True  ' let user update the underlying database
     ' after deleting the current record, the current record still points to the
     ' deleted record (though it cannot be updated). 
     ' The user must MoveNext/Back to view other records.
 End Sub

Answer 1

DataRow.Delete不会从数据库中删除此行。它将DataRow＆＃39; s RowState标记为deleted。如果您致电Update，我们会从DataAdapter检查此项。如果状态为Deleted，则会根据您必须提供的DeleteCommand查找其状态。

因此，您需要为DataAdapter提供DeleteCommand，这是从数据库中删除该行的SQL。

Answer 2

您想删除它

_DataSet.Tables(0).Rows(CInt(txtCurrent.Text) - 1).Delete()

 Dim adapter As New SqlDataAdapter
 Dim cmdBuilder As New SqlCommandBuilder(adapter)
 Dim DutyDetails As String = "SELECT * from MyTable"

 adapter.SelectCommand = New SqlCommand(DutyDetails, SQLConn)
 adapter.UpdateCommand = cmdBuilder.GetUpdateCommand
 adapter.DeleteCommand = cmdBuilder.GetDeleteCommand

 Dim cb As SqlCommandBuilder = New SqlCommandBuilder(adapter)

  adapter.Update(_DataSet.Tables("0"))

来源：Deleting a record from dataset and sql server

Answer 3

您将表格称为_DataSet.Tables(0)，然后稍后将其称为_DataSet.Tables("0")我打赌其中一个不正确。

从数据库中删除记录时出错

3 个答案: