红警三盟军攻略:求贵人详细解释这些vb代码?万分感谢

Public Function ExecuteSQL(ByVal SQL As String, MsgString As String) As ADODB.Recordset
Dim cnn As ADODB.Connection
Dim rst As ADODB.Recordset
Dim sTokens() As String
SQL = Replace(SQL, vbCrLf, vbNullString)
'MsgBox ConnectString, vbOKOnly + vbExclamation, "警告"

On Error GoTo ExecuteSQL_Error

sTokens = Split(SQL)
Set cnn = New ADODB.Connection
cnn.ConnectionString = (ConnectString)
cnn.Open
'cnn.Open ConnectString
If InStr("INSERT,DELETE,UPDATE", UCase$(sTokens(0))) Then
cnn.Execute SQL
MsgString = sTokens(0) & " query successful"
Else
'Set rst = New ADODB.Recordset
'rst.Open Trim$(SQL), cnn, adOpenKeyset, adLockOptimistic
'cnn.Execute SQL
Set rs = New ADODB.Recordset
With rs
.ActiveConnection = cnn
.CursorLocation = adUseClient
.CursorType = adOpenKeyset
.LockType = adLockOptimistic
.Open SQL
End With

Set ExecuteSQL = rs
MsgString = "查询到" & ExecuteSQL.RecordCount & " 条记录 "
End If
ExecuteSQL_Exit:
Set rst = Nothing
Set cnn = Nothing
Exit Function
ExecuteSQL_Error:
MsgString = "查询错误: " & Err.Description
Resume ExecuteSQL_Exit
End Function