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The WillExecute and ExecuteComplete Events
An event is a subroutine that can be called automatically after a specific
operation has occurred.
- The WillExecute event can be fired just before a call to
objcomm.Execute, objconn.Execute, or objrs.Open.
- The ExecuteComplete event can be fired after a call to objcomm.Execute,
objconn.Execute, objrs.Open, objrs.Requery, or objrs.NextRecordset is completed.
Syntax
WillExecute src,cursortyp,locktyp,options,
status,objcomm,objrs,objconn
ExecuteComplete recaffected,objerror,status,
objcomm,objrs,objconn
|
| Parameter |
Description |
| src |
A string that contains an SQL command or a stored procedure name
|
| cursortyp |
Specifies the type of cursor to be used. One of the CursorTypeEnum
values
|
| locktyp |
Specifies the type of lock to be used. One of the LockTypeEnum
values
|
| options |
One or more of the CommandTypeEnum or
ExecuteOptionEnum values
|
| recaffected |
The number of records affected by the execution
|
| objerror |
An Error object that contains the errors that occurred
Note: The EventStatusEnum value must be set to
adStatusErrorsOccurred to create the Error object
|
| status |
An EventStatusEnum value
|
| objcomm |
For WillExecute: Set to the Command object that was executed or to
Nothing
For ExecuteComplete: The Command object that was executed
|
| objrs |
For WillExecute: Set to the Recordset object that resulted from the execution of the command or to
Nothing
For ExecuteComplete: The Recordset object that is the result of the executed
command
|
| objconn |
The Connection object that is associated with the execution of the
command
|
CursorTypeEnum Values
Specifies the type of cursor used in a Recordset object.
| Constant |
Value |
Description |
| adOpenUnspecified |
-1 |
Does not specify the type of cursor. |
| adOpenForwardOnly |
0 |
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. |
| adOpenKeyset |
1 |
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. |
| adOpenDynamic |
2 |
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. |
| adOpenStatic |
3 |
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. |
LockTypeEnum Values
| Constant |
Value |
Description |
| adLockUnspecified |
-1 |
Does not specify a type of lock. For clones, the clone is created with
the same lock type as the original. |
| adLockReadOnly |
1 |
Indicates read-only records. You cannot alter the data. |
| adLockPessimistic |
2 |
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 |
3 |
Indicates optimistic locking, record by record. The provider uses
optimistic locking, locking records only when you call the Update
method. |
| adLockBatchOptimistic |
4 |
Indicates optimistic batch updates. Required for batch update mode. |
CommandTypeEnum Values
| Constant |
Value |
Description |
| adCmdUnspecified |
-1 |
Does not specify the command type argument. |
| adCmdText |
1 |
Evaluates CommandText as a textual definition of a command or stored
procedure call. |
| adCmdTable |
2 |
Evaluates CommandText as a table name whose columns are all returned
by an internally generated SQL query. |
| adCmdStoredProc |
4 |
Evaluates CommandText as a stored procedure name. |
| adCmdUnknown |
8 |
Indicates that the type of command in the CommandText
property is not known. |
| adCmdFile |
256 |
Evaluates CommandText as the file name of a persistently stored
Recordset. Used with Recordset.Open or Requery only. |
| adCmdTableDirect |
512 |
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. This value cannot be
combined with the ExecuteOptionEnum value adAsyncExecute. |
ExecuteOptionEnum Values
| Constant |
Value |
Description |
| adOptionUnspecified |
-1 |
Indicates that the command is unspecified. |
| adAsyncExecute |
16 |
Indicates that the command should execute asynchronously. This value
cannot be combined with the CommandTypeEnum value adCmdTableDirect. |
| adAsyncFetch |
32 |
Indicates that the remaining rows after the initial quantity specified
in the CacheSize property should be retrieved asynchronously. |
| adAsyncFetchNonBlocking |
64 |
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. If you open a Recordset from a Stream
containing a persistently stored Recordset, adAsyncFetchNonBlocking will
not have an effect; the operation will be synchronous and blocking.
adAsynchFetchNonBlocking has no effect when the adCmdTableDirect option
is used to open the Recordset. |
| adExecuteNoRecords |
128 |
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.
adExecuteNoRecords can only be passed as an optional parameter to the
Command or Connection Execute method. |
| adExecuteStream |
256 |
Indicates that the results of a command execution should be returned
as a stream. adExecuteStream can only be passed as an optional parameter
to the Command Execute method. |
| adExecuteRecord |
512 |
Indicates that the CommandText is a command or stored procedure that
returns a single row which should be returned as a Record object. |
EventStatusEnum Values
| Constant |
Value |
Description |
| adStatusOK |
1 |
The operation that fired the event was successful |
| adStatusErrorsOccurred |
2 |
The operation that fired the event failed |
| adStatusCantDeny |
3 |
Cannot cancel the pending operation |
| adStatusCancel |
4 |
Cancels the operation that fired the event |
| adStatusUnwantedEvent |
5 |
Prevents subsequent notifications before the event method has finished
executing |
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