خاصية حالة ADO
مرجع كائن الحقل الكامل
تقوم خاصية الحالة بإرجاع قيمة FieldStatusEnum التي تشير إلى حالة كائن الحقل. القيمة الافتراضية هي adFieldOK.
في حالة فشل أي تحديثات ، يتم إرجاع خطأ وتشير خاصية الحالة إلى القيم المجمعة للعملية ورمز حالة الخطأ. يمكن استخدام خاصية الحالة لكل حقل لتحديد سبب عدم إضافة الحقل أو تعديله أو حذفه.
يتم الإبلاغ عن مشاكل إضافة حقل أو تعديله أو حذفه من خلال هذه الخاصية. على سبيل المثال ، إذا حذف المستخدم حقلاً ، فسيتم وضع علامة عليه للحذف في مجموعة الحقول. إذا أرجع استدعاء التحديث خطأً لأن المستخدم حاول حذف حقل ليس لديه إذن به ، فستكون حالة هذا الحقل adFieldPermissionDenied أو adFieldPendingDelete.
بناء الجملة
objfield.Status
مثال
<%
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
%>
قيم FieldStatusEnum
| 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. |
مرجع كائن الحقل الكامل