如何用VBA更新Oracle的BLOB类型字段

可以使用ADO对象的Stream对象来操作BLOB类型字段。以下是一个示例代码：

Sub UpdateBlobField()
    Dim conn As ADODB.Connection
    Dim rs As ADODB.Recordset
    Dim stream As ADODB.Stream
    
    Set conn = New ADODB.Connection
    With conn
        .ConnectionString = "Provider=OraOLEDB.Oracle;Data Source=OracleDB;User ID=USERNAME;Password=PASSWORD;"
        .Open
    End With
    
    Set rs = New ADODB.Recordset
    rs.Open "SELECT BlobColumn FROM TableName WHERE ID=1", conn, adOpenDynamic, adLockOptimistic
    
    Set stream = New ADODB.Stream
    stream.Type = adTypeBinary
    stream.Open
    stream.LoadFromFile "C:\FilePath\File.pdf"
    rs.Fields("BlobColumn").Value = stream.Read
    
    rs.Update
    
    rs.Close
    conn.Close
End Sub

这个代码会从本地文件系统中读取一个PDF文件，并将其更新到Oracle数据库表的BLOB类型字段中。你需要将Data Source、User ID和Password替换为你的实际值，以及将TableName和BlobColumn替换为你的实际表和字段名。