用VB6编写的应用程序。 DB是Pervasive v9.5。
目前有效:
Public Sub Save()
if rs.State = adStateOpen Then
rs.AddNew
SetFields rs
rs.Update
End If
end sub
Public Sub SetFields(rs as ADODB.Recordset)
rs!Name = strName
StrToField strReport rs!Report
StrToField strResponse rs!Response
end sub
Public Sub StrToField(ByVal str As String, fld As ADODB.Field)
Dim Data As String
Dim StrSize As Long, CharsRead As Long
' for field of LONVARCHAR type only
If fld.Type = adLongVarChar Then
StrSize = Len(str)
Do While StrSize <> CharsRead
If StrSize - CharsRead < BLOCK_SIZE_LONGVARCHAR Then
Data = Mid(str, CharsRead + 1, StrSize - CharsRead)
CharsRead = StrSize
Else
Data = Mid(str, CharsRead + 1, BLOCK_SIZE_LONGVARCHAR)
CharsRead = CharsRead + BLOCK_SIZE_LONGVARCHAR
End If
fld.AppendChunk Data
Loop
Else
' do something
End If
End Sub
Const BLOCK_SIZE_LONGVARCHAR = 4096
这可以正常工作,直到我的报告或响应变量大于32000个字符。调用rs.update时收到此错误消息:
“[Pervasive] [ODBC客户端接口]字符串长度超出列长度参数#15。数据被截断。”
任何人都可以指出我正确的方向或让我知道我是否遗漏了什么。 Pervasive Longvarchar最大大小应为2GB。
谢谢, 格雷厄姆
答案 0 :(得分:0)
此代码使用PSQL v11(我没有v9.5)。
Dim conn As New ADODB.Connection
Set conn = New ADODB.Connection
conn.ConnectionString = "demodata"
conn.Open
Dim sql As String
Dim cmd As New ADODB.Command
cmd.ActiveConnection = conn
cmd.CommandText = "insert into lvc (f2) values (?)"
Dim parm As New ADODB.Parameter
parm.Name = "f2"
Dim longstring As String
Open "c:\longdata.txt" For Input As #1
Do While Not EOF(1)
Line Input #1, sNextLine
'do something with it
'add line numbers to it, in this case!
sText = sText & sNextLine
Loop
longstring = sText
parm.Value = longstring
cmd.Parameters.Append cmd.CreateParameter("param1", adLongVarChar, adParamInput, Len(longstring), longstring)
cmd.Execute
conn.Close
MsgBox "done"
基本上,您将使用参数化查询而不是.AddNew方法。