DbServer.BLOBRootGet Method |  |
Retrieve the data from the root area of a BLOB file.
Namespace: VO
Assembly: VORDDClasses (in VORDDClasses.dll) Version: 2.21
SyntaxRequest Example
View Source
The data retrieved from the root of the BLOB file. The data type of the return value depends on the actual data stored. Use ValType() or UsualType() to determine the data type. Note that DBServer:BLOBRootGet() returns NIL if the root reference has never been written to with DBServer:BLOBRootPut().
Return Value
Type: UsualThe data retrieved from the root of the BLOB file. The data type of the return value depends on the actual data stored. Use ValType() or UsualType() to determine the data type. Note that DBServer:BLOBRootGet() returns NIL if the root reference has never been written to with DBServer:BLOBRootPut().
Remarks
DBServer:BLOBRootGet() allows the retrieval of a BLOB from the root of a BLOB file.
 Tip |
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| Because the root data does not reference a particular record in the data server, it is not affected by DBServer:RLock(), nor is it subject to the DataServer:ConcurrencyControl settings. Therefore, if the data server is opened in shared mode, you should use DBServer:BLOBRootLock() before calling DBServer:BLOBRootGet(). |
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#
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