"Greater than or equal to ' searches on pavement

How can I implement a search "superior or equal to ' on the pavement?

I created a Btree that allows keys duplicated like this (I'm using Python and pybsddb ):

db_object = db. DB (DBE)
db_object.set_flags (db. DB_DUP | DB. DB_DUPSORT)
db_object. Open (define_primary_db_name (primary_db_name), None, db. DB_BTREE, db. DB_CREATE)

The keys are a series of integers, which here is a partial list (before they are inserted into the Btree, they are converted to strings):

... 90700, 91500, 91900, 92500, 93159, 94500, 94700, 95300, 96400, 97779, 98600, 98900 99900, 100000, 101900...

I would like to be able to question the Btree amount and get all values is greater than or equal to a specified amount.

I wrote a function to open a cursor, point to the first value using DB_SET_RANGE, and then iterate (via DB_NEXT) until the end:

def greater_than_equal_to (amount):
AMT = int (amount)
[data =]
CUR = db_object.cursor)
REC = cur.get (amount, db. DB_SET_RANGE)
If rec:
Data.Append(Rec[0])
all REC:
REC = cur.get (amount, db. DB_NEXT)
If it's not rec:
breaking
If int(rec[0]) & gt; = amt:
Data.Append(Rec[0])
cur. Close()
return data

But when I tried, I got only some, not all, results that I wanted, like on this model:

% greater_than_equal_to('91500')
'91500', '91900', '92500', '93159', '94500 ', '94700', ' 95300', ' 96400 ', ' 97779', 98600', 98900', 99900'

So, obviously, the requirement that the keys are strings has an impact on the results, since any key not starting not not by "9" is ignored by the cursor / call DB_SET_RANGE.

Is there a way to get the cursor to look at the keys correctly (i.e., in the form of numbers) to make it work as I wish?

Hello. Your analysis of the situation is correct, because your keys are stored as strings, functions of default comparison sorts 150000 before 9. In order to avoid a complete analysis of the database for your search, you will need to implement a custom comparer to tell BDB how to sort your data. You can find more information about it here:
http://www.jcea.es/Programacion/pybsddb_doc/4.7.3/DB.html#set_bt_compare
and here:
http://www.Oracle.com/technology/documentation/Berkeley-DB/DB/api_c/db_set_bt_compare.html

If all your keys are numeric, the comparison function must be simple, convert the two values and return leftKey less to rightKey. If your keys are not purely digital, design a correct comparison function will be much more difficult.

Ben Schmeckpeper

Tags: Database

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