db.defined
| Syntax |
db.defined (f, path)
|
| Params |
f is a filespec or path string of a Frontier object database file that has been opened with db.open. path is a valid UserTalk address string, indicating the location in the database whose existence you wish to determine.
|
| Action |
Determines whether or not a value exists in the location indicated by path.
|
| Returns |
True if path is a valid address of an existing object in the database, false otherwise.
|
| Examples |
db.defined ("System:Frontier:old.root", "examples.age") » true
db.defined ("System:Frontier:old.root", "examples.[\"doesn't exist"]")
|
| Notes |
The database file specified in the parameter "f" must be opened using db.open before calling this verb. path can be a full or partial database address; the paths table of the target database is used to interpret it. db.defined (f, path) is equivalent to defined (address (path)^) when referring to Frontier's current object database.
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| See Also |
db.open
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