[英]boxes stay empty after UPDATE sql query in ms-access
我在MS ACCESS中創建了以下查詢:
"UPDATE dbo_PricingFutures
SET dbo_PricingFutures.ttm =
DateDiff('m',dbo_PricingFutures.PricingDate,DateSerial(dbo_PricingFutures.PricingYear,dbo_PricingFutures.PricingMonth,14));"
當我運行查詢時,應該計算日期之間的差。 它說它將更新記錄:
但是,列中的字段保持為空。 我不明白為什么?
由於一個錯誤,列pricedate為空。 我運行了以下vba代碼:
Sub ttm()
Dim db As Database, rs As DAO.Recordset, strsql As String
Dim startdate As Date, maturity As Date, maturity_month As Double
Dim maturity_year As Double
Set db = CurrentDb()
strsql = "SELECT * FROM dbo_PricingFutures ORDER BY PricingDate;"
Set rs = db.OpenRecordset(strsql, dbOpenDynaset)
rs.MoveFirst
While (Not rs.EOF())
rs.Edit
startdate = rs.Fields("PricingDate")
maturity_month = rs.Fields("PricingMonth")
maturity_year = rs.Fields("PricingYear")
maturity = DateSerial(maturity_year, maturity_month, 14)
rs.Fields("ttm") = DateDiff("d", startdate, maturity)
rs.Update
rs.MoveNext
Wend
rs.Close
db.Close
End Sub
然后我在下面的行出現錯誤:
startdate = rs.Fields("PricingDate")
它顯示列PricingDate為空。 然后,我從舊的備份中獲取數據,將其復制/粘貼到PricingDate列中,並且運行良好。
SQL代碼正在運行,沒有顯示錯誤。
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