Python implements Sqlite's method of querying fields as indexes-Python Tutorial-php.cn

Python implements Sqlite's method of querying fields as indexes

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Release： 2016-08-04 08:55:39

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The example in this article describes how Python implements Sqlite to query fields as indexes. Share it with everyone for your reference, the details are as follows:

By default, the data obtained from sqlite is digitally indexed. During the development stage, the database is often modified, so it is inconvenient. In fact, there is a solution in the python source code. I directly read the source code of sqlite3 and explored some. The solution is as follows :

If you connect by default, use the following code, which is indexed by numbers:

conn = sqlite3.connect(dbfile)
cur = conn.cursor()

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In order to make the obtained result set use the field as the index, you need to add a function and a class:

def dict_factory(cursor, row):
  d = {}
  for idx, col in enumerate(cursor.description):
    d[col[0]] = row[idx]
  return d
class MyCursor(sqlite3.Cursor):
  def __init__(self, *args, **kwargs):
    sqlite3.Cursor.__init__(self, *args, **kwargs)
    self.row_factory = dict_factory

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Then modify the connection code:

conn = sqlite3.connect(dbfile)
cur = conn.cursor(factory=MyCursor)

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What is read after that is indexed by the field.

Readers who are interested in more Python-related content can check out the special topics on this site: "Summary of common database operation skills in Python", "Python data structure and algorithm tutorial", "Summary of Python Socket programming skills", "Summary of Python function usage skills" , "A Summary of Python String Operation Skills", "A Classic Tutorial for Getting Started with Python" and "A Summary of Python File and Directory Operation Skills"

I hope this article will be helpful to everyone in Python programming.

Related labels：

python sqlite Field Inquire index

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