DbServer.BLOBDirectGet Method |  |
Retrieve data stored in a BLOB file without referencing a specific field.
Namespace: VO
Assembly: VORDDClasses (in VORDDClasses.dll) Version: 2.19
SyntaxRequest Example
View Source
The data retrieved from 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.
Parameters
- nPointer (Optional)
- Type: Usual
A pointer to the BLOB data. This pointer can be obtained using DBServer:BLOBDirectPut(), DBServer:BLOBDirectImport(), or DBServer:FieldInfo(DBS_BLOB_POINTER, nFieldPos). - nStart (Optional)
- Type: Usual
The starting position in nPointer. If nStart is positive, the starting position is relative to the leftmost character in nPointer. If nStart is negative, it is relative to the rightmost character in nPointer. If nStart is omitted, it is assumed to be 1. - nCount (Optional)
- Type: Usual
The number of bytes of data to retrieve, beginning at nStart. If nCount is larger than the amount of data stored, excess data is ignored. If omitted, DBServer:BLOBDirectGet() retrieves to the end of the data.
Return Value
Type: UsualThe data retrieved from 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.
Remarks Tip |
|---|
| nStart and nCount apply to string data only. They are ignored for any other data types. |
Examples
This example illustrates storing setup information in a BLOB file, then selectively retrieving the stored information:
X#
1FUNCTION PutSettings(aColors AS ARRAY,; 2aPaths AS ARRAY, aPW AS ARRAY) AS VOID 3LOCAL aSettings AS ARRAY 4LOCAL oDBSetup AS DBServer 5oDBSetup := Setup{} 6aSettings := {} 7AAdd(aSettings, oDBSetup:BLOBDirectPut(0, aColors)) 8AAdd(aSettings, oDBSetup:BLOBDirectPut(0, aPaths)) 9AAdd(aSettings, oDBSetup:BLOBDirectPut(0, aPW)) 10oDBSetup:BLOBRootPut(aSettings) 11oDBSetup:Close() 12FUNCTION GetColors() AS ARRAY 13LOCAL aSettings AS ARRAY 14LOCAL aColors AS ARRAY 15LOCAL oDBSetup AS DBServer 16oDBSetup := Setup{} 17aSettings := oDBSetup:BLOBRootGet() 18aColors := oDBSetup:BLOBDirectGet(aSettings[1]) 19oDBSetup:Close() 20RETURN aColors
See Also