dataset - 从 vb.net 中的数据集中过滤记录

Question

我要从数据集中过滤值 .它包含以零和非零值开头的电话号码。如何从数据集中过滤电话号码(以非零开头)。下面是 vb.net 代码和由此产生的错误。

cmd = New OracleCommand("select  PHONE from  reports.renewal_contact_t where run_date=to_date('" + TextBox1.Text + "','mm/dd/yyyy') and  EXP_DATE =to_date('" + TextBox2.Text + "','mm/dd/yyyy') and  region not in('TNP')", cn)
ada = New OracleDataAdapter(cmd)
ada.Fill(ds, "reports.renewal_contact_t ")
Dim ds1 As New DataSet
ds1.Tables("reports.renewal_contact_t").DefaultView.RowFilter = "PHONE NOT like'0'"

错误:你调用的对象是空的。行过滤器行中的错误

Answer 1

在您的 ds1 中有 无表 *reports.renewal_contact_t*。将其更改为

cmd = New OracleCommand("select  PHONE from  reports.renewal_contact_t where run_date=to_date('" + TextBox1.Text + "','mm/dd/yyyy') and  EXP_DATE =to_date('" + TextBox2.Text + "','mm/dd/yyyy') and  region not in('TNP')", cn)
ada = New OracleDataAdapter(cmd)
ada.Fill(ds, "reports.renewal_contact_t")
' no need for a new dataset - as you fill ds (and not ds1)!!
ds.Tables("reports.renewal_contact_t").DefaultView.RowFilter = "PHONE NOT like'0'"