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自动获得下一记录ID号码(ORACLE)
作者: xiaohe
'--FUNCTION : it can get One Database's espacialy Fields SERIALNO
'--Parament :
' (1). mLen : the FIELD's total length
' (2). mHead : the SerialNo Start with Charactor
' (3). mField: the database fields name it will be.
' (4). mDB : Database Name
'--Return : Return a Specaily format string with you want HEADCHAR by appointed.
'--Attention: the mLen must no less than the length of mHead
'--Example : sSerialNo = GetSerialNo(12, "TA", "ta_id", "mtotal_Asset")
'==-----------------------------------------------------------------------------------------------------
Function GetSerialNo(mLen, mHead, mField, mDB)
Dim tmpstr
dim strSql
dim tmpRs
If mLen <= len(mHead) then 'if Length of head Character equal mLen
GetSerialNo = Null 'then return NULL
exit function
end if
mHead = UCase(mHead)
strSql = " Select max(" & mField & ") mMax from " & mDB
strSql = strSql & " Where " & mField & " like '" & mHead & "%'" 'The sql Condition
Set tmpRs = Server.CreateObject("ADODB.RecordSet")
tmpRs.Open strSql, Session("OraArsConn")
If (tmpRs.BOF And tmpRs.EOF) Then
tmpstr = String(mLen - Len(mHead) - 1, "0") & "1" 'The base begin with 1
tmpstr = mHead + tmpstr
Else
IF not IsNull(tmpRs.Fields("mMax")) Then
tmpstr = tmpRs.Fields("mMax") 'Get the max value
tmpStr = Mid(tmpStr,Len(mHead) + 1,mLen)
tmpStr = CInt(tmpStr) + 1 'Increase the value
tmpStr = mHead & String(mLen - len(mHead) - len(tmpStr),"0") & tmpStr 'Create New SerialNo
Else
tmpstr = String(mLen - Len(mHead) - 1, "0") & "1" 'The base begin with 1
tmpstr = mHead + tmpstr
End If
End If
tmpRs.close
set tmpRs = nothing
GetSerialNo = tmpstr
End Function
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