X# Runtime and VO SDK Reference
X# Runtime and VO SDK Reference
VO Namespace
DbServer Class
DbServer Methods
DbServer.Append Method
DbServer.AppendDB Method
DbServer.AppendDelimited Method
DbServer.AppendSDF Method
DbServer.Average Method
DbServer.BLOBDirectExport Method
DbServer.BLOBDirectGet Method
DbServer.BLOBDirectImport Method
DbServer.BLOBDirectPut Method
DbServer.BLOBExport Method
DbServer.BLOBGet Method
DbServer.BLOBImport Method
DbServer.BLOBRootGet Method
DbServer.BLOBRootLock Method
DbServer.BLOBRootPut Method
DbServer.BLOBRootUnlock Method
DbServer.ClearFilter Method
DbServer.ClearIndex Method
DbServer.ClearLocate Method
DbServer.ClearOrderScope Method
DbServer.ClearRelation Method
DbServer.ClearScope Method
DbServer.Close Method
DbServer.Commit Method
DbServer.ConstructUniqueAlias Method
DbServer.Continue Method
DbServer.CopyDB Method
DbServer.CopyDelimited Method
DbServer.CopySDF Method
DbServer.CopyStructure Method
DbServer.Count Method
DbServer.CreateIndex Method
DbServer.CreateOrder Method
DbServer.DataField Method
DbServer.Delete Method
DbServer.DeleteAll Method
DbServer.DeleteOrder Method
DbServer.Error Method
DbServer.Eval Method
DbServer.FIELDGET Method
DbServer.FieldGetBytes Method
DbServer.FieldGetFormatted Method
DbServer.FieldHyperLabel Method
DbServer.FieldInfo Method
DbServer.FieldName Method
DbServer.FieldPos Method
DbServer.FIELDPUT Method
DbServer.FieldPutBytes Method
DbServer.FieldSpec Method
DbServer.FieldStatus Method
DbServer.FieldSym Method
DbServer.FieldValidate Method
DbServer.FLOCK Method
DbServer.GetArray Method
DbServer.GetLocate Method
DbServer.GetLookupTable Method
DbServer.GoBottom Method
DbServer.GoTo Method
DbServer.GoTop Method
DbServer.INDEXKEY Method
DbServer.INDEXORD Method
DbServer.Info Method
DbServer.Join Method
DbServer.Locate Method
DbServer.LockCurrentRecord Method
DbServer.LockSelection Method
DbServer.NoIVarGet Method
DbServer.NoIVarPut Method
DbServer.Notify Method
DbServer.OrderDescend Method
DbServer.OrderInfo Method
DbServer.OrderIsUnique Method
DbServer.OrderKeyAdd Method
DbServer.OrderKeyCount Method
DbServer.OrderKeyDel Method
DbServer.OrderKeyGoTo Method
DbServer.OrderKeyNo Method
DbServer.OrderScope Method
DbServer.OrderSkipUnique Method
DbServer.Pack Method
DbServer.RDDINFO Method
DbServer.Recall Method
DbServer.RecallAll Method
DbServer.RecordInfo Method
DbServer.Refresh Method
DbServer.Reindex Method
DbServer.Relation Method
DbServer.Replace Method
DbServer.ResetNotification Method
DbServer.RLOCK Method
DbServer.RLockVerify Method
DbServer.Seek Method
DbServer.SELECT Method
DbServer.SetDataField Method
DbServer.SetFilter Method
DbServer.SetIndex Method
DbServer.SetOrder Method
DbServer.SetOrderCondition Method
DbServer.SetRelation Method
DbServer.SetSelectiveRelation Method
DbServer.Skip Method
DbServer.Sort Method
DbServer.Sum Method
DbServer.SuspendNotification Method
DbServer.Total Method
DbServer.UnLock Method
DbServer.Update Method
DbServer.Zap Method
Click or drag to resize

DbServer.BLOBRootLock Method

X#
Obtain a lock on the root area of a BLOB file.

Namespace:  VO
Assembly:  VORDDClasses (in VORDDClasses.dll) Version: 2.19
Syntax
Copy
 VIRTUAL METHOD BLOBRootLock() AS USUAL
Request Example View Source

Return Value

Type: Usual
TRUE if successful; otherwise, FALSE.
Remarks
Use DBServer:BLOBRootLock() when accessing the data server in shared mode to obtain a lock on the root area of a BLOB file for reading from or writing to the root area.
Examples
This example illustrates how to store information in the root of a BLOB file and how to use locking for a data server opened in shared mode.
X#
Copy
 1FUNCTION GetSettings()
 2LOCAL aCustSettings AS ARRAY
 3LOCAL oDBCust AS DBServer
 4// Open a customer file in shared mode
 5oDBCust := Customer{}
 6IF oDBCust:BLOBRootLock()
 7aCustSettings := oDBCust:BLOBRootGet()
 8oDBCust:BLOBRootUnlock()
 9ELSE
10Alert("Could not obtain root lock")
11ENDIF
12oDBCust:Close()
13RETURN aCustSettings
See Also