ADO NumericScale プロパティと Precision プロパティの例 (VB)

適用先: Access 2013、Office 2013

この例では、NumericScale プロパティと Precision プロパティを使用して、Pubs データベースの Discounts テーブル内のフィールドの数値スケールと有効桁数を表示します。

 
'BeginNumericScaleVB 
 
 'To integrate this code 
 'replace the data source and initial catalog values 
 'in the connection string 
 
Public Sub Main() 
 On Error GoTo ErrorHandler 
 
 ' connection and recordset variables 
 Dim rstDiscounts As ADODB.Recordset 
 Dim Cnxn As ADODB.Connection 
 Dim fldTemp As ADODB.Field 
 Dim strCnxn As String 
 Dim strSQLDiscounts As String 
 
 ' Open connection 
 Set Cnxn = New ADODB.Connection 
 strCnxn = "Provider='sqloledb';Data Source='MySqlServer';" & _ 
 "Initial Catalog='Pubs';Integrated Security='SSPI';" 
 Cnxn.Open strCnxn 
 
 ' Open recordset 
 Set rstDiscounts = New ADODB.Recordset 
 strSQLDiscounts = "Discounts" 
 rstDiscounts.Open strSQLDiscounts, Cnxn, adOpenStatic, adLockReadOnly, adCmdTable 
 
 ' Display numeric scale and precision of 
 ' numeric and small integer fields 
 For Each fldTemp In rstDiscounts.Fields 
 If fldTemp.Type = adNumeric Or fldTemp.Type = adSmallInt Then 
 MsgBox "Field: " & fldTemp.Name & vbCr & _ 
 "Numeric scale: " & _ 
 fldTemp.NumericScale & vbCr & _ 
 "Precision: " & fldTemp.Precision 
 End If 
 Next fldTemp 
 
 ' clean up 
 rstDiscounts.Close 
 Cnxn.Close 
 Set rstDiscounts = Nothing 
 Set Cnxn = Nothing 
 Exit Sub 
 
ErrorHandler: 
 ' clean up 
 If Not rstDiscounts Is Nothing Then 
 If rstDiscounts.State = adStateOpen Then rstDiscounts.Close 
 End If 
 Set rstDiscounts = Nothing 
 
 If Not Cnxn Is Nothing Then 
 If Cnxn.State = adStateOpen Then Cnxn.Close 
 End If 
 Set Cnxn = Nothing 
 
 If Err <> 0 Then 
 MsgBox Err.Source & "-->" & Err.Description, , "Error" 
 End If 
 
End Sub 
'EndNumericScaleVB