clear me about cursor type

[sal21]

I work with vb6 and access database and i need only read recordset.

my conn:

Public Sub APRI_CONNESSIONE3()

On Error GoTo Err_SomeName

If Not CONN3 Is Nothing Then
If CONN3.State = 1 Then
CONN3.Close
End If
Set CONN3 = Nothing
End If

Set CONN3 = New ADODB.Connection
With CONN3
.CursorLocation = adUseClient
.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\REPORT_L0928\DATABASE\" & MIO_DB & "-L0928_TEST.mdb;Persist Security Info=False"
End With

Exit_SomeName:
Exit Sub

Err_SomeName:
MsgBox Err.Number & Err.Description
Resume Exit_SomeName

End Sub

my open recorset:

Public Function ExecuteSQL(SQL)

CLEAN_UP

Set RST0 = New ADODB.Recordset
With RST0
.CursorLocation = adUseServer
DoEvents
'test1
'.Open SQL, CONN3, adOpenStatic, adLockReadOnly, adCmdText
'test2
'.Open SQL, CONN3, adOpenDynamic, adLockOptimistic, adCmdText
'test3
.Open SQL, CONN3, adOpenForwardOnly, adLockReadOnly, adCmdText
'test4
.Open SQL, CONN3, adOpenStatic, adLockOptimistic, adCmdText

End With

End Function

Public Function CLEAN_UP()

If Not RST0 Is Nothing Then
If RST0.State = 1 Then
RST0.Close
End If
Set RST0 = Nothing
End If

End Function


i have tested all 3 .open statement but not sure wat i need really.

note:
- approx records in table are 1.500.xxx
- i have eindexed all fileds in clausole Where

- here one of mine query, for example:

SQL = "SELECT DT FROM L0_SI WHERE (CONTAB='" & TEST_CONTAB & "') GROUP BY DT"
ExecuteSQL (SQL)

[dglienna]

Read this. It describes the various options:

'Syntax:
RS.Open "Source" (a table or sql statement), "Connection", "Cursor Type", "Record Locking Type", "Type of Open" (Table, text, stored procedure, etc.

'Ex:
RS.Open "SELECT * FROM Table1;"
'The source is to select all fields and records from the table called "Table1"

'Ex:
RS.Open "SELECT * FROM Table1;", CN
'CN is your connection object to the database so it knows what database and location, etc.

'Ex:
RS.Open "SELECT * FROM Table1;", CN, adOpenKeyset
'There are 4 types of cursor types (CursorTypeEnum):
adOpenForwardOnly - Default. Uses a forward-only cursor. Identical to a static cursor, except that you can only scroll forward through records. This improves performance when you need to make only one pass through a Recordset.
adOpenDynamic  - Uses a dynamic cursor. Additions, changes, and deletions by other users are visible, and all types of movement through the Recordset are allowed, except for bookmarks, if the provider doesn't support them.
adOpenKeyset - Uses a keyset cursor. Like a dynamic cursor, except that you can't see records that other users add, although records that other users delete are inaccessible from your Recordset. Data changes by other users are still visible.
adOpenStatic - Uses a static cursor. A static copy of a set of records that you can use to find data or generate reports. Additions, changes, or deletions by other users are not visible.

'Ex:
RS.Open "SELECT * FROM Table1;", CN, adOpenKeyset, adLockOptimistic
'There are 4 basic types of recordlocking:
adLockReadOnly - Indicates read-only records. You cannot alter the data.
adLockPessimistic - Indicates 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 after editing.
adLockOptimistic - Indicates optimistic locking, record by record. The provider uses optimistic locking, locking records only when you call the Update method.
adLockBatchOptimistic - Indicates optimistic batch updates. Required for batch update mode.

'Ex:
RS.Open "SELECT * FROM Table1;", CN, adOpenKeyset, adLockOptimistic, adCmdText
'Options: A Long value that indicates how the provider should evaluate the Source argument
'There are a few options for Options: CommandTypeEnum -
adCmdText - Evaluates CommandText as a textual definition of a command or stored procedure call.
adCmdTable - Evaluates CommandText as a table name whose columns are all returned by an internally generated SQL query.
adCmdStoredProc - Evaluates CommandText as a stored procedure name.
adCmdUnknown - Default. Indicates that the type of command in the CommandText property is not known.
adCmdFile - Evaluates CommandText as the file name of a persistently stored Recordset. Used with Recordset.Open or Requery only.
adCmdTableDirect - Evaluates CommandText as a table name whose columns are all returned. Used with Recordset.Open or Requery only. To use the Seek method, the Recordset must be opened with adCmdTableDirect. 

'And ExecuteOptionEnum - 
adAsyncExecute - Indicates that the command should execute asynchronously. 
adAsyncFetch - Indicates that the remaining rows after the initial quantity specified in the CacheSize property should be retrieved asynchronously.
adAsyncFetchNonBlocking - Indicates that the main thread never blocks while retrieving. If the requested row has not been retrieved, the current row automatically moves to the end of the file. 
adExecuteNoRecords - Indicates that the command text is a command or stored procedure that does not return rows (for example, a command that only inserts data). If any rows are retrieved, they are discarded and not returned. 
adExecuteStream - Indicates that the results of a command execution should be returned as a stream. 
adExecuteRecord - Indicates that the CommandText is a command or stored procedure that returns a single row which should be returned as a Record object.
adOptionUnspecified - Indicates that the command is unspecified.

[HanneSThEGreaT]

Sal21, please use CODE tags when posting code. It makes your code much easier to read and follow.

[sal21]

Sal21, please use CODE tags when posting code. It makes your code much easier to read and follow.

Ok for the future.. sorry me.