Vlastnost stavu ADO
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Vlastnost Status vrací hodnotu FieldStatusEnum , která označuje stav objektu Field. Výchozí hodnota je adFieldOK.
Pokud se některé aktualizace nezdaří, vrátí se chyba a vlastnost Status označuje kombinované hodnoty kódu stavu operace a chyby. Vlastnost Stav pro každé pole lze použít k určení, proč nebylo pole přidáno, upraveno nebo odstraněno.
Problémy s přidáním, úpravou nebo odstraněním pole jsou hlášeny prostřednictvím této vlastnosti. Pokud například uživatel odstraní pole, bude označeno k odstranění v kolekci Fields. Pokud volání Update vrátí chybu, protože se uživatel pokusil odstranit pole, pro které nemá oprávnění, bude stav tohoto pole adFieldPermissionDenied nebo adFieldPendingDelete.
Syntax
objfield.Status
Příklad
<%
set conn=Server.CreateObject("ADODB.Connection")
conn.Provider="Microsoft.Jet.OLEDB.4.0"
conn.Open "c:/webdata/northwind.mdb"
set rs = Server.CreateObject("ADODB.Recordset")
rs.open "Select * from orders", conn
response.write(rs.Fields(0).Status)
rs.Close
conn.close
%>
FieldStatusEnum hodnoty
| Constant | Value | Description |
|---|---|---|
| adFieldOK | 0 | Default. The field was successfully added or deleted |
| adFieldCantConvertValue | 2 | The field cannot be retrieved or stored without loss of data |
| adFieldIsNull | 3 | The provider returned a null value |
| adFieldTruncated | 4 | Variable-length data was truncated when reading from the data source |
| adFieldSignMismatch | 5 | The data value returned by the provider was signed, but the data type of the ADO field value was unsigned |
| adFieldDataOverflow | 6 | The data returned from the provider overflowed the data type of the field |
| adFieldCantCreate | 7 | The field could not be added because the provider exceeded a limitation |
| adFieldUnavailable | 8 | The provider could not determine the value when reading from the data source |
| adFieldPermissionDenied | 9 | The field cannot be modified because it is read-only |
| adFieldIntegrityViolation | 10 | The field cannot be modified because it is a calculated or derived entity |
| adFieldSchemaViolation | 11 | The value violated the data source schema constraint for the field |
| adFieldBadStatus | 12 | An invalid status value was sent from ADO to the OLE DB provider |
| adFieldDefault | 13 | The default value for the field was used when setting data |
| adFieldIgnore | 15 | This field was skipped when setting data values in the source |
| adFieldDoesNotExist | 16 | The field does not exist |
| adFieldInvalidURL | 17 | The data source URL contains invalid characters |
| adFieldResourceLocked | 18 | The provider cannot perform the operation because the data source is locked |
| adFieldResourceExists | 19 | The provider cannot perform the operation because an object already exists at the destination URL and it is not able to overwrite the object |
| adFieldCannotComplete | 20 | The server of the URL specified by Source could not complete the operation |
| adFieldVolumeNotFound | 21 | The provider is unable to locate the storage volume indicated by the URL |
| adFieldOutOfSpace | 22 | The provider is unable to obtain enough storage space to complete a move or copy operation |
| adFieldCannotDeleteSource | 23 | During a move operation, a tree or subtree was moved to a new location, but the source could not be deleted |
| adFieldReadOnly | 24 | The field in the data source is read-only |
| adFieldResourceOutOfScope | 25 | A source or destination URL is outside the scope of the current record |
| adFieldAlreadyExists | 26 | The specified field already exists |
| adFieldPendingInsert | 0x10000 | The Append operation caused the status to be set. The field has been marked to be added to the Fields collection after the Update method is called |
| adFieldPendingDelete | 0x20000 | The Delete operation caused the status to be set. The field has been marked for deletion from the Fields collection after the Update method is called |
| adFieldPendingChange | 0x40000 | The field has been deleted and then re-added or the value of the field which previously had a status of adFieldOK has changed |
| adFieldPendingUnknown | 0x80000 | The provider cannot determine what operation caused field status to be set |
| adFieldPendingUnknownDelete | 0x100000 | The provider cannot determine what operation caused field status to be set, and that the field will be deleted from the Fields collection after the Update method is called. |
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