DBSequence¶
Read Oracle documentation for better understanding.
Sequences provide an arbitrary number of persistent objects that return an increasing or decreasing sequence of integers. Opening a sequence handle associates it with a record in a database. The handle can maintain a cache of values from the database so that a database update is not needed as the application allocates a value.
DBSequence Methods¶
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DBSequence(db, flags=0)¶ Constructor. More info…
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open(key, txn=None, flags=0)¶ Opens the sequence represented by the key. More info…
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close(flags=0)¶ Close a DBSequence handle. More info…
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initial_value(value)¶ Set the initial value for a sequence. This call is only effective when the sequence is being created. More info…
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get(delta=1, txn=None, flags=0)¶ Returns the next available element in the sequence and changes the sequence value by delta. More info…
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get_dbp()¶ Returns the DB object associated to the DBSequence. More info…
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get_key()¶ Returns the key for the sequence. More info…
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remove(txn=None, flags=0)¶ Removes the sequence from the database. This method should not be called if there are other open handles on this sequence. More info…
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get_cachesize()¶ Returns the current cache size. More info…
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set_cachesize(size)¶ Configure the number of elements cached by a sequence handle. More info…
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get_flags()¶ Returns the current flags. More info…
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set_flags(flags)¶ Configure a sequence. More info…
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stat(flags=0)¶ Returns a dictionary of sequence statistics with the following keys:
wait
The number of times a thread of control was forced to wait on the handle mutex.
nowait
The number of times that a thread of control was able to obtain handle mutex without waiting.
current
The current value of the sequence in the database.
value
The current cached value of the sequence.
last_value
The last cached value of the sequence.
min
The minimum permitted value of the sequence.
max
The maximum permitted value of the sequence.
cache_size
The number of values that will be cached in this handle.
flags
The flags value for the sequence.
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stat_print(flags=0)¶ Prints diagnostic information. More info…
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get_range()¶ Returns a tuple representing the range of values in the sequence. More info…
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set_range((min, max))¶ Configure a sequence range. More info…