使用 FOXPRO 数据库的 VFPOLEDB 提供程序从返回的集合中排除已删除的记录 [英] Excluding Deleted Records from returned Set using VFPOLEDB provider for FOXPRO database
本文介绍了使用 FOXPRO 数据库的 VFPOLEDB 提供程序从返回的集合中排除已删除的记录的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
VS 2010、VB.NET、WINFORMS.在我的应用程序中，我需要导入 foxpro 数据库表并排除已删除的记录.问题是 FOXPRO 表将删除的项目保留在同一个表中.我曾尝试在连接字符串中使用 DELETED=NO 但 vb 抛出
VS 2010, VB.NET, WINFORMS. In my app i have a need to import foxpro database tables and exclude the deleted records. The problem is that FOXPRO tables keep deleted items inside the same table. I have tried using DELETED=NO in the connection string but vb throws
"Format of the initialization string does not conform to the OLE DB specification."
我的功能如下:
Dim _DBConn1 As String = "provider=vfpoledb.1; Data Source = " & file1 & ";DELETED=NO"
Dim _DBConn2 As String = "provider=vfpoledb.1; Data Source = " & file2 & ";DELETED=NO"
Dim _DBConn3 As String = "provider=vfpoledb.1; Data Source = " & file3 & ";DELETED=NO"
Dim _DBConn4 As String = "provider=vfpoledb.1; Data Source = " & file4 & ";DELETED=NO"
Using _connection As New OleDbConnection(_DBConn1)
Dim _savedId As String = String.Empty
_connection.Open()
Using _command As New OleDbCommand("SELECT * FROM " & _fileName1 & "", _connection)
Using _reader2 As OleDbDataReader = _command.ExecuteReader
While _reader2.Read
counter += 1
End While
y = 100 / counter
Dim x As String = String.Empty
End Using
Using _reader As OleDbDataReader = _command.ExecuteReader
While _reader.Read
Dim _letter As Integer = Nothing
Dim _name As String = String.Empty
Dim _content As String = String.Empty
Dim _copies As Integer = Nothing
Dim _type As Integer = Nothing
Dim _fee As Decimal = Nothing
_letter = _reader.Item(0)
_name = _reader.Item(1)
_content = _reader.Item(2)
_copies = _reader.Item(3)
_type = _reader.Item(4)
_fee = _reader.Item(5)
_UpdateLetters(_letter, _name, _content, _copies, _type, _fee)
_progress += y
Dim d As Integer = Convert.ToInt16((Convert.ToString(y).Split(".")(0)))
ProgressBar1.Increment(d)
End While
End Using
End Using
_connection.Close()
End Using
Using _connection As New OleDbConnection(_DBConn2)
Dim _savedId As String = String.Empty
_connection.Open()
Using _command As New OleDbCommand("SELECT * FROM " & _fileName2 & "", _connection)
Using _reader2 As OleDbDataReader = _command.ExecuteReader
While _reader2.Read
counter += 1
End While
y = 100 / counter
Dim x As String = String.Empty
End Using
Using _reader As OleDbDataReader = _command.ExecuteReader
While _reader.Read
Dim _unit As String = String.Empty
Dim _Size As String = String.Empty
Dim _contractDate As String = String.Empty
Dim _deposit As Decimal = Nothing
Dim _Tfirst As String = String.Empty
Dim _Tlast As String = String.Empty
Dim _optional As String = String.Empty
Dim _address1 As String = String.Empty
Dim _address2 As String = String.Empty
Dim _city As String = String.Empty
Dim _st As String = String.Empty
Dim _zip As String = String.Empty
Dim _hphone As String = String.Empty
Dim _drLicense As String = String.Empty
Dim _employer As String = String.Empty
Dim _wphone As String = String.Empty
Dim _bname As String = String.Empty
Dim _baddress1 As String = String.Empty
Dim _baddress2 As String = String.Empty
Dim _bCity As String = String.Empty
Dim _bState As String = String.Empty
Dim _bZip As String = String.Empty
Dim _bPhone As String = String.Empty
Dim _contact_Name As String = String.Empty
Dim _contact_Address1 As String = String.Empty
Dim _contact_Address2 As String = String.Empty
Dim _contact_City As String = String.Empty
Dim _contact_State As String = String.Empty
Dim _contact_zip As String = String.Empty
Dim _contact_phone As String = String.Empty
Dim _balance As Decimal = Nothing
Dim _lastPaymentDate As String = String.Empty
Dim _lastPayAmount As Decimal = Nothing
Dim _memo As String = String.Empty
Dim _lateFee As Decimal = Nothing
Dim _email As String = String.Empty
_unit = _reader.Item(0)
_Size = _reader.Item(1)
_contractDate = _reader.Item(2)
_deposit = _reader.Item(3)
_Tfirst = _reader.Item(4)
_Tlast = _reader.Item(5)
_optional = _reader.Item(6)
_address1 = _reader.Item(7)
_address2 = _reader.Item(8)
_city = _reader.Item(9)
_st = _reader.Item(10)
_zip = _reader.Item(11)
_hphone = _reader.Item(12)
_drLicense = _reader.Item(13)
_employer = _reader.Item(15)
_wphone = _reader.Item(16)
_bname = _reader.Item(17)
_baddress1 = _reader.Item(18)
_baddress2 = _reader.Item(19)
_bCity = _reader.Item(20)
_bState = _reader.Item(21)
_bZip = _reader.Item(22)
_bPhone = _reader.Item(23)
_contact_Name = _reader.Item(24)
_contact_Address1 = _reader.Item(25)
_contact_Address2 = _reader.Item(26)
_contact_City = _reader.Item(27)
_contact_State = _reader.Item(28)
_contact_zip = _reader.Item(29)
_contact_phone = _reader.Item(30)
_balance = _reader.Item(32)
_lastPaymentDate = _reader.Item(33)
_lastPayAmount = _reader.Item(34)
_memo = _reader.Item(46)
_lateFee = _reader.Item(49)
_email = _reader.Item(50)
_UpdateTenent(_unit, _Size, _contractDate, _deposit, _Tfirst, _Tlast, _optional, _address1, _address2, _city, _st, _zip, _hphone, _drLicense, _employer, _wphone, _bname, _baddress1, _baddress2, _bCity, _bState, _bZip, _bPhone, _contact_Name, _contact_Address1, _contact_Address2, _contact_City, _contact_State, _contact_zip, _contact_phone, _balance, _lastPaymentDate, _lastPayAmount, _memo, _lateFee, _email)
_progress += y
Dim d As Integer = Convert.ToInt16((Convert.ToString(y).Split(".")(0)))
ProgressBar2.Increment(d)
End While
End Using
End Using
_connection.Close()
End Using
任何想法我的连接字符串是怎么错误的?Google 结果为我指明了 DELETED=NO 的方向，但既然我已经添加了它，它就会抛出该异常错误..
Any ideas how my Connection string is wrong? Google results pointed me in the direction of DELETED=NO but its throwing that exception error now that I have added it..
推荐答案
VfpOleDb 提供程序默认排除已删除的记录.因此您的连接字符串不需要包含已删除的设置.如果您想包含删除记录...您可以在连接字符串中包含deleted=false".
The VfpOleDb provider excludes deleted records by default. So your connection string doesn't need to include the deleted setting. If you wanted to include delete records... you would include "deleted=false" in the connection string.
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