我已经与我的数据库问题,到目前为止的工作,我不能为我无法通过datagridview的更新命令中的datagridview数据库
有人可以检查更新我的数据库的原因一个新的模块进行在我的代码为什么我不能更新我的数据库在datagridview使用按钮单击?
这里就是我有我的DataGrid内容:
Public Sub loaddgvfrm3()
cmdconn = New SqlConnection
cmd = New SqlCommand
cmdconn.ConnectionString = sqlstr
cmdconn.Open()
cmd.Connection = cmdconn
cmd.CommandText = "select period, VOUCH_AMT, INDIVIDUAL_AMT, check_no, D_MAILED, DIR_NO, who_updated, claim_no, year_student from tobee.EBD_BILLHISTORY where CLAIM_NO like '" + txtClaimno.Text + "'"
'cmd.CommandText = "select a.period, a.VOUCH_AMT, a.INDIVIDUAL_AMT, a.check_no, a.bal_ent, a.D_MAILED, a.DIR_NO from tobee.EBD_BILLHISTORY a left join carlos.claims_waivee b on a.CLAIM_NO = b.claim_no where b.CLAIM_NO like '" + claimno.ToString + "'"
Dim dt As New DataTable
'Dim ds As New DataSet
da = New SqlDataAdapter
da.SelectCommand = cmd
da.Fill(dt)
Me.DataGridView1.DataSource = dt
Me.DataGridView2.DataSource = dt
cmdconn.Close()
End Sub
现在我想,我到数据库与buttonclick
这里做出的DataGridView和更新变化中修改某些行是我按一下按钮的代码:
Private Sub btnSave_Click(sender As Object, e As EventArgs) Handles btnSave.Click
Dim connstr As String = "server=midtelephone\sqlexpress; database=testdb; user= sa; password=sa;"
Dim cmd2 As New SqlCommand
Try
Using connection As New SqlConnection(connstr)
connection.Open()
cmd2.CommandText = "update tobee.EBD_BILLHISTORY set [email protected], [email protected]_amt, [email protected]_amt, [email protected]_no, [email protected]_mailed, [email protected]_no, [email protected]_updated where claim_no = '" + txtClaimno.Text + "' "
cmd2.Parameters.Add("@period", SqlDbType.Char, 25, "period")
cmd2.Parameters.Add(New SqlParameter("@vouch_amt", SqlDbType.Decimal) With {.Precision = 18, .Scale = 2}).Value = "vouch_amt"
cmd.Parameters.Add(New SqlParameter("@individual_amt", SqlDbType.Decimal) With {.Precision = 18, .Scale = 2}).Value = "individual_amt"
cmd2.Parameters.Add("@check_no", SqlDbType.Char, 15, "check_no")
'cmd2.Parameters.Add("@d_mailed", SqlDbType.DateTime, "d_mailed")
cmd2.Parameters.Add("@dir_no", SqlDbType.Char, 15, "DIR_NO")
cmd2.Parameters.Add("@who_updated", SqlDbType.Char, 15, "who_updated")
cmd2.ExecuteNonQuery()
connection.Close()
MsgBox("changes done")
'MessageBox.Show("Updated Successfully!", "Update", MessageBoxButtons.OK, MessageBoxIcon.Information)
End Using
Catch ex As Exception
msgbox(ex.message)
End Try
End Sub
出现的问题“的ExecuteNonQuery:连接属性尚未初始化” 可能是什么职业如果你有任何其他建议(更新)我在datagridview pls中所做的更改,我会不会知道mybutton保存的缺陷?(我不知道我是否正确地执行操作,是否将这两个“subs”正确连接?)。随意修改保存按钮:(
将断点放入'Catch'块中,在调试模式下运行您的应用程序。如果它转到'Catch',深入'ex'以获取有关导致异常的信息。或者至少,在'Catch'块中放置'MessageBox.Show(“Something”)',以便在发生异常时得到通知。 – har07
我得到了更新。 executenonquery:连接属性尚未初始化。那是错误。我的savebtn子是以某种方式连接到loaddgvfrm? :( –
基于错误消息,似乎你错过了单行。检查我的答案:)关于第二个问题:不。鉴于所有在sub中声明的变量,两个subs都没有连接在任何地方 – har07