Hvad betyder denne kode?

her er hvad tallere er:

'-----------------------------------------------------
' ADO Cursor Types
'------------------------------------------------------
Const adOpenUnspecified = -1
Const adOpenForwardOnly = 0
Const adOpenKeyset = 1
Const adOpenDynamic = 2
Const adOpenStatic = 3
'------------------------------------------------------
' ADO Lock Types
'------------------------------------------------------
Const adLockUnspecified = -1
Const adLockReadOnly = 1
Const adLockPessimistic = 2
Const adLockOptimistic = 3
Const adLockBatchOptimistic = 4


objRS.open SQL, connection, Cursor Types, Lock Type

Her er de sidste konstanter:

'---- CommandTypeEnum Values ----
Const adCmdUnknown = 0
Const adCmdText = &H0001
Const adCmdTable = &H0002
Const adCmdStoredProc = &H0004


objRS.open SQL, connection, Cursor Types, Lock Type, Commandtype

Et sammendrag fra msdn:

Syntax:
recordset.Open Source, ActiveConnection, CursorType, LockType, Options

Cursortype:
0: adOpenForwardOnly (Default) Opens a forward-only–type cursor.
1: adOpenKeyset Opens a keyset-type cursor.
2: adOpenDynamic Opens a dynamic-type cursor.
3: adOpenStatic Opens a static-type cursor.

LockType:
1: adLockReadOnly (Default) Read-only—you cannot alter the data.
2: adLockPessimistic Pessimistic locking, record by record—the provider does what is necessary to ensure successful editing of the records, usually by locking records at the data source immediately upon editing.
3: adLockOptimistic Optimistic locking, record by record—the provider uses optimistic locking, locking records only when you call the Update method.
4:adLockBatchOptimistic Optimistic batch updates—required for batch update mode as opposed to immediate update mode.

Option:
1: adCmdText Indicates that the provider should evaluate Source as a textual definition of a command.
2: adCmdTable Indicates that ADO should generate an SQL query to return all rows from the table named in Source.
512: adCmdTableDirect Indicates that the provider should return all rows from the table named in Source. 
4: adCmdStoredProc Indicates that the provider should evaluate Source as a stored procedure.
8: adCmdUnknown Indicates that the type of command in the Source argument is not known.
256: adCmdFile Indicates that the persisted (saved) Recordset should be restored from the file named in Source. 
16: adAsyncExecute Indicates that the Source should be executed asynchronously.
32: adAsyncFetch Indicates that after the initial quantity specified in the Initial Fetch Size property is fetched, any remaining rows should be fetched asynchronously. If a row is required that has not been fetched, the main thread is blocked until the requested row becomes available. 
64: adAsyncFetchNonBlocking Indicates that the main thread never blocks while fetching. If the requested row has not been fetched, the current row automatically moves to the end of the file.

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