OpenSchema 方法示例 (VB)

适用于：Access 2013、Office 2013

此示例使用 OpenSchema 方法显示 Pubs 数据库中每个表的名称和类型。

 
'BeginOpenSchemaVB 
 
 'To integrate this code 
 'replace the data source and initial catalog values 
 'in the connection string 
 
Public Sub OpenSchemaX() 
 On Error GoTo ErrorHandler 
 
 Dim Cnxn As ADODB.Connection 
 Dim rstSchema As ADODB.Recordset 
 Dim strCnxn As String 
 
 Set Cnxn = New ADODB.Connection 
 strCnxn = "Provider='sqloledb';Data Source='MySqlServer';" & _ 
 "Initial Catalog='Pubs';Integrated Security='SSPI';" 
 Cnxn.Open strCnxn 
 
 Set rstSchema = Cnxn.OpenSchema(adSchemaTables) 
 
 Do Until rstSchema.EOF 
 Debug.Print "Table name: " & _ 
 rstSchema!TABLE_NAME & vbCr & _ 
 "Table type: " & rstSchema!TABLE_TYPE & vbCr 
 rstSchema.MoveNext 
 Loop 
 
 ' clean up 
 rstSchema.Close 
 Cnxn.Close 
 Set rstSchema = Nothing 
 Set Cnxn = Nothing 
 Exit Sub 
 
ErrorHandler: 
 ' clean up 
 If Not rstSchema Is Nothing Then 
 If rstSchema.State = adStateOpen Then rstSchema.Close 
 End If 
 Set rstSchema = 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 
'EndOpenSchemaVB 

此示例在 OpenSchema 方法 Criteria 参数中指定TABLE_TYPE查询约束。 因此，仅返回 Pubs 数据库中指定的视图的架构信息。 本示例随后显示每个表的名称和类型。

 
'BeginOpenSchema2VB 
Public Sub Main() 
 On Error GoTo ErrorHandler 
 
 Dim Cnxn2 As ADODB.Connection 
 Dim rstSchema As ADODB.Recordset 
 Dim strCnxn As String 
 
 Set Cnxn2 = New ADODB.Connection 
 strCnxn = "Provider=sqloledb;" & _ 
 "Data Source=MySqlServer;Initial Catalog=Pubs;Integrated Security=SSPI; " 
 Cnxn2.Open strCnxn 
 
 Set rstSchema = Cnxn2.OpenSchema(adSchemaTables, Array(Empty, Empty, Empty, "VIEW")) 
 
 Do Until rstSchema.EOF 
 Debug.Print "Table name: " & _ 
 rstSchema!TABLE_NAME & vbCr & _ 
 "Table type: " & rstSchema!TABLE_TYPE & vbCr 
 rstSchema.MoveNext 
 Loop 
 
 ' clean up 
 rstSchema.Close 
 Cnxn2.Close 
 Set rstSchema = Nothing 
 Set Cnxn2 = Nothing 
 Exit Sub 
 
ErrorHandler: 
 ' clean up 
 If Not rstSchema Is Nothing Then 
 If rstSchema.State = adStateOpen Then rstSchema.Close 
 End If 
 Set rstSchema = Nothing 
 
 If Not Cnxn2 Is Nothing Then 
 If Cnxn2.State = adStateOpen Then Cnxn2.Close 
 End If 
 Set Cnxn2 = Nothing 
 
 If Err <> 0 Then 
 MsgBox Err.Source & "-->" & Err.Description, , "Error" 
 End If 
End Sub 
'EndOpenSchema2VB