问题
I open a lmdb
database using this code:
lmdb_env = lmdb.open(source_path, readonly=True)
How can I count the number of records in this database?
回答1:
I think it should be like this:
lmdb_env = lmdb.open(lmdb_file_name, readonly=True)
print lmdb_env.stat()
Then it prints the directory that Jaco pasted here.
回答2:
You can use event.stat()
. It will return the following dictionary with entries
detailing the number of records in this database:
{'branch_pages': 1040L,
'depth': 4L,
'entries': 3761848L,
'leaf_pages': 73658L,
'overflow_pages': 0L,
'psize': 4096L}
回答3:
I found a simple solution using for
loop. Here it is:
count = 0
for key, value in lmdb_env.cursor():
count = count + 1
However, I think there should be a better way using pre-defined function.
来源:https://stackoverflow.com/questions/34420375/count-number-of-records-in-lmdb-databse-with-python