SQLTransaction을 사용하여 두 테이블에서 관련 레코드의 내용을 삭제하는 방법은 무엇입니까?

Question

다음 코드를 사용하여 "초기화 문자열의 형식이 인덱스 0에서 시작하는 사양을 준수하지 않습니다."라는 오류가 발생합니다. 명령은 두 개의 테이블, 즉 StudentDetails.Students를 마스터 테이블로, RegistrationDetails.Registration을 자식 테이블로 삭제하여 관련 레코드를 삭제합니다.

Private Sub cmdDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdDelete.Click 
    Try 
     Dim cd As String 

     If txtStudentID.Text = "" And txtName.Text = "" And cboDay.Text = "" And cboMonth.Text = "" And txtYear.Text = "" And lblAge.Text = "" And radioMale.Checked = False Or RadioFemale.Checked = False And txtGName.Text = "" And txtPhone.Text = "" And txtEmail.Text = "" And txtAddress.Text = "" And txtTown.Text = "" And cboRegion.Text = "" And PictureBox1.ImageLocation = "" Then 
      MessageBox.Show("There is no record selected to delete. Search for the record to delete.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error) 
     Else 
      cd = MessageBox.Show("You are about to delete this record. Are you sure you want to delete?", "Confirm Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Question) 
      If cd = vbYes Then 
       Using c As New SqlConnection("connection string") 
        c.Open() 
        Using tx As SqlTransaction = c.BeginTransaction() 
         Try 
          Using cmd As SqlCommand = c.CreateCommand() 
           cmd.CommandText = "delete from RegistrationDetails.Registration where StudentId = @studentId" 
           cmd.Parameters.Add("@studentId", SqlDbType.BigInt).Value = txtStudentID.Text 
           cmd.ExecuteNonQuery() 

           cmd.CommandText = "delete from StudentDetails.Students where StudentId = @studentId" 
           cmd.Parameters.Add("@studentId", SqlDbType.BigInt).Value = txtStudentID.Text 
           cmd.ExecuteNonQuery() 

           tx.Commit() 
          End Using 
         Catch generatedExceptionName As Exception 
          tx.Rollback() 
          ' take care of exception here 
          Throw 
         End Try 
        End Using 
       End Using 
       MessageBox.Show("Record deleted", "Deleted", MessageBoxButtons.OK, MessageBoxIcon.Information) 
       showgrid() 
       txtStudentID.Clear() 
       txtName.Clear() 
       cboDay.Text = "" 
       cboMonth.Text = "" 
       txtYear.Clear() 
       lblAge.Text = "" 
       If radioMale.Checked = True Then 
        Gender = "" 
       End If 
       txtGName.Clear() 
       txtPhone.Clear() 
       txtEmail.Clear() 
       txtAddress.Clear() 
       txtTown.Clear() 
       cboRegion.Text = "" 
       PictureBox1.Image = PictureBox1.ErrorImage 
       txtStudentID.Focus() 
      End If 
     End If 
    Catch ex As Exception 
     MessageBox.Show(ex.Message) 
    End Try 
End Sub 

Answer 1

이렇게하면 문제가 해결 될 수도 있습니다.

cmd.CommandText = "delete from RegistrationDetails.Registration where StudentId = @studentId" 
Dim sqlParam as SqlParameter = cmd.Parameters.Add("@studentId", SqlDbType.BigInt) 
sqlParam.Value = txtStudentID.Text 
cmd.ExecuteNonQuery() 

cmd.CommandText = "delete from StudentDetails.Students where StudentId = @studentId" 
sqlParam.Value = txtStudentID.Text 
cmd.ExecuteNonQuery() 

실제로 쿼리와 동일한 매개 변수를 추가 할 때마다 단일 SqlCommand를 사용하고 있습니다.

희망이 도움이됩니다.