See Also: Get_Attribute, Set_Attribute
The number of currently loaded database drivers.
Global
Integer, temporary
Read Only
Positive Integers
DF_NUMBER_DRIVERS returns the number of database drivers that are currently loaded. It can be used to enumerate the currently loaded drivers or to determine the index of a specific loaded driver. The index of a specific loaded driver is need for driver level attributes.
The driver number is not a constant; it is the index of the loaded driver, so you will need to get it once you loaded the driver.
Procedure ShowDriverList
Integer iNumDrivers
String sDriver
Integer iDriver
Get_Attribute DF_NUMBER_DRIVERS To iNumDrivers
For iDriver From 1 To iNumDrivers
Get_Attribute DF_DRIVER_NAME of iDriver to sDriver
Showln "Driver: " sDriver
Loop
Showln
Showln "Done..."
End_Procedure // ShowDriverList
This example enumerates all loaded drivers and lists them.
Function DriverIndex String sDriver Returns Integer
String sCurrentDriver
Integer iNumberOfDrivers
Integer iDriver
Integer iCount
Move 0 To iDriver
Get_Attribute DF_NUMBER_DRIVERS To iNumberOfDrivers
For iCount From 1 To iNumberOfDrivers
Get_Attribute DF_DRIVER_NAME Of iCount To sCurrentDriver
If (Uppercase(sCurrentDriver)) = (Uppercase(sDriver)) ;
Move iCount To iDriver
Loop
Function_Return iDriver
End_Function // DriverIndex
The sample function above returns the index for a specific loaded driver.