Python uses Berkeley DB database instance _python

This article describes the Python use of Berkeley DB Database method, share for everyone to reference.

The implementation methods are as follows:

Try: From 
  BSDDB import db 
except Importerror: from 
  bsddb3 import DB 
print db. Db_version_string 
#检测是否有bsddb包 
 
def irecords (curs): Record 
  = Curs.first () while record 
  : 
    yield Record Record 
    = Curs.next () 
     
adb = db. db () 
adb.open (' db_filename ', DbType = db. Db_hash, flags = db. db_create) 
for i,w in enumerate ("Some word for example". Split ()): 
  adb.put (W,str (i)) 
   
for key, data in Irecords (Adb.cursor ()): 
  print Key,data 
adb.close () 
print ' * ' *60 
# 
the_same_db = db. DB () 
the_same_db.open ("Db_filename") 
the_same_db.put (' Skidoo ', ', ') #加入数据库 
the_same_db.put (' for ') , ' Change the data '] #改变数据库的数据 
for key, data in Irecords (The_same_db.cursor ()): 
  print Key,data 
the_same_ Db.close ()

The results of the operation are as follows:

Berkeley DB 4.7.25: (May, 2008)
Example 3
some 0
word 1 for
2
**********************************
Example 3
some 0
word 1 for change the
data
Skidoo 23

Here is a summary of the steps to be done:

1. Initialize the database First

ADB = db. DB ()

2. Open the Database

Adb.open (' db_filename ', DbType = db. Db_hash, flags = db. Db_create)

3. Inserting or modifying data in a database

Adb.put (' Skidoo ', ', ') #加入数据库
adb.put (' for ', ' Change the data ') #改变数据库的数据

4. Close the database

Adb.close ()

I hope this article will help you with your Python programming.