adding data to oracle database in vb6 - oracle

Question

I have a problem adding data oracle database,it's show me this message(" https://ufile.io/lzpuj ") Run-time ORA-00904:"EMPCODE": invalid identifier.
This is Cody:
Dim connEmp As ADODB.Connection
Dim rsEmp As ADODB.Recordset
Private Sub Command1_Click()
Set rsEmp = New ADODB.Recordset
rsEmp.Open "select * from tablebooks where empcode = '" & Text1.Text & "'",
connEmp, adOpenKeyset, adLockReadOnly, adCmdText
If rsEmp.RecordCount <> 0 Then
MsgBox " ! åÐÇ ÇáßÊÇÈ ãæÌæÏ ÈÇáÝÚá "
rsEmp.Close
Set rsEmp = Nothing
Exit Sub
Else
Set rsEmp = New ADODB.Recordset
rsEmp.Open "select * from tablebooks where empcode = '" & Text1.Text & "'",
connEmp, adOpenKeyset, adLockPessimistic, adCmdText
rsEmp.AddNew
rsEmp!Book_no = Val(Trim(Text1.Text))
rsEmp!Book_name = Trim(Text2.Text)
rsEmp!Author_name = Trim(Text10.Text)
rsEmp!Edition_no = Val(Trim(Text3.Text))
rsEmp!Publisher_place = Trim(Text11.Text)
rsEmp!Part_no = Val(Trim(Text5.Text))
rsEmp!Book_cost = Trim(Text6.Text)
rsEmp!Place_book = Trim(Text7.Text)
rsEmp!Note = Trim(Text9.Text)
rsEmp!Date_publishing = DTPicker1.Value
rsEmp!Subject = Trim(Combo4.Text)
rsEmp!State = Trim(Combo4.Text)
rsEmp.Update
connEmp.Execute "commit"
rsEmp.Close
Set rsEmp = Nothing
Label11.Visible = True
Label11 = " ! ÊãÊ ÇáÅÖÇÝÉ ÈäÌÇÍ "
End If
End Sub

Answer 1

First make sure empcode is exactly the right column name.
Then fix your code. You have two big issues:
It's crazy-vulnerable to Sql Injection attacks.
It tries to re-open the same command on the same connection in the ELSE block for no reason.
The exact fix for #1 depends on which provider you are using (Ole vs Odbc), but this link might help:
Call a parameterized Oracle query from ADODB in Classic ASP
For #2, this is somewhat better:
Dim connEmp As ADODB.Connection
Dim rsEmp As ADODB.Recordset
Private Sub Command1_Click()
Set rsEmp = New ADODB.Recordset
'TODO: Use parameterized query here!
rsEmp.Open "select * from tablebooks where empcode = #empcode '" & Text1.Text & "'",
connEmp, adOpenKeyset, adLockReadOnly, adCmdText
If rsEmp.RecordCount <> 0 Then
MsgBox " ! åÐÇ ÇáßÊÇÈ ãæÌæÏ ÈÇáÝÚá "
rsEmp.Close
Set rsEmp = Nothing
Exit Sub
End If
rsEmp.AddNew
rsEmp!Book_no = Val(Trim(Text1.Text))
rsEmp!Book_name = Trim(Text2.Text)
rsEmp!Author_name = Trim(Text10.Text)
rsEmp!Edition_no = Val(Trim(Text3.Text))
rsEmp!Publisher_place = Trim(Text11.Text)
rsEmp!Part_no = Val(Trim(Text5.Text))
rsEmp!Book_cost = Trim(Text6.Text)
rsEmp!Place_book = Trim(Text7.Text)
rsEmp!Note = Trim(Text9.Text)
rsEmp!Date_publishing = DTPicker1.Value
rsEmp!Subject = Trim(Combo4.Text)
rsEmp!State = Trim(Combo4.Text)
rsEmp.Update
connEmp.Execute "commit"
rsEmp.Close
Set rsEmp = Nothing
Label11.Visible = True
Label11 = " ! ÊãÊ ÇáÅÖÇÝÉ ÈäÌÇÍ "
End Sub