[英]vb6 ADODB recordset size retrieval
使用ADODB-是否有一个函数可以检索结果查询的实际大小? (vb6)
我并不是说它的计数是我的实际大小,我想知道需要通过网络使用多少数据来检索我的查询结果。
如果不存在这样的东西,我想我总是可以获取所有检索到的数据,将其转换为字节,然后开始计算,但是如果已经内置了某些东西(应该是),我想避免使用它。
谢谢 !
ps使用.mdb文件,使用adodb 2.0库
这是一个示例,在使用ADO提取客户端记录集之后,报告了WorkingSetSize
Option Explicit
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
Private Declare Function GetCurrentProcess Lib "kernel32" () As Long
Private Declare Function GetProcessMemoryInfo Lib "psapi" (ByVal hProcess As Long, ppsmemCounters As PROCESS_MEMORY_COUNTERS, ByVal cb As Long) As Long
Private Type PROCESS_MEMORY_COUNTERS
cb As Long
PageFaultCount As Long
PeakWorkingSetSize As Long
WorkingSetSize As Long
QuotaPeakPagedPoolUsage As Long
QuotaPagedPoolUsage As Long
QuotaPeakNonPagedPoolUsage As Long
QuotaNonPagedPoolUsage As Long
PagefileUsage As Long
PeakPagefileUsage As Long
PrivateUsage As Long
End Type
Private Function pvGetWorkingSetSize() As String
Dim uCounters As PROCESS_MEMORY_COUNTERS
On Error GoTo QH
If GetProcessMemoryInfo(GetCurrentProcess(), uCounters, Len(uCounters)) <> 0 Then
pvGetWorkingSetSize = Format$(pvToUnsigned(uCounters.WorkingSetSize) / 1024 / 1024, "0.00") & "MB"
End If
QH:
End Function
Private Function pvToUnsigned(ByVal lValue As Long) As Currency
Call CopyMemory(pvToUnsigned, lValue, 4)
pvToUnsigned = pvToUnsigned * 10000@
End Function
'--- UI stuff
Private Sub Command1_Click()
Const CONN_STR As String = "Provider=SQLOLEDB;Data Source=UCSDB\R2;Initial Catalog=Dreem15_IVB_2;Integrated Security=SSPI"
Dim rs As ADODB.Recordset
pvLog "Starting"
Set rs = New ADODB.Recordset
pvLog "After loading ADO"
Set rs = New ADODB.Recordset
rs.CursorLocation = adUseClient
rs.Open "SELECT 1 AS ID", CONN_STR, adOpenStatic, adLockBatchOptimistic
pvLog "After loading SQLOLEDB"
Set rs = New ADODB.Recordset
rs.CursorLocation = adUseClient
rs.Open "SELECT TOP 10000 * FROM inv_Docs", CONN_STR, adOpenStatic, adLockBatchOptimistic
pvLog "After fetching 10000 records"
With New PropertyBag
.WriteProperty "rs", rs
pvLog "Propbag size: " & Format$(UBound(.Contents) / 1024 / 1024, "0.00") & "MB"
End With
pvLog "After destroy propbag"
Set rs = Nothing
pvLog "After destroy recordset"
End Sub
Private Sub Command2_Click()
pvLog "Ping"
End Sub
Private Sub pvLog(sText As String)
Text1.Text = Text1.Text & Format$(Timer, "0.00") & ": " & pvGetWorkingSetSize() & ", " & sText & vbCrLf
Text1.SelStart = &H7FFF
Refresh
End Sub
这是三个连续执行后的结果
60366.48: 17.71MB, Starting
60366.48: 18.04MB, After loading ADO
60366.51: 22.00MB, After loading SQLOLEDB
60366.74: 48.49MB, After fetching 10000 records
60368.34: 62.81MB, Propbag size: 6.04MB
60368.34: 50.73MB, After destroy propbag
60368.34: 28.63MB, After destroy recordset
60369.45: 28.67MB, Starting
60369.45: 28.68MB, After loading ADO
60369.47: 28.90MB, After loading SQLOLEDB
60369.71: 53.28MB, After fetching 10000 records
60371.30: 67.41MB, Propbag size: 6.04MB
60371.30: 55.33MB, After destroy propbag
60371.30: 33.88MB, After destroy recordset
60371.95: 33.88MB, Starting
60371.95: 33.88MB, After loading ADO
60371.96: 33.91MB, After loading SQLOLEDB
60372.20: 56.37MB, After fetching 10000 records
60373.80: 69.11MB, Propbag size: 6.04MB
60373.80: 57.03MB, After destroy propbag
60373.80: 34.09MB, After destroy recordset
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