Python 数据库操作

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打算把python连接db的例子都总结下来.

python连接sqllite

#!/usr/bin/python
# -*- coding: utf-8 -*-
'''
Created on 2/13/2011

@author: yunshichen@gmail.com
'''

'''

tutorial link: http://docs.python.org/py3k/library/sqlite3.html

SQLite is a C library that provides a lightweight disk-based database that doesn’t require a separate server process and allows accessing the database using a nonstandard variant of the SQL query language. Some applications can use SQLite for internal data storage. It’s also possible to prototype an application using SQLite and then port the code to a larger database such as PostgreSQL or Oracle.

sqlite3 was written by Gerhard Häring and provides a SQL interface compliant with the DB-API 2.0 specification described by PEP 249.

To use the module, you must first create a Connection object that represents the database. Here the data will be stored in the /tmp/example file:

'''

import sqlite3

DB_FILE = '/tmp/example'

def listData():
    conn = sqlite3.connect(DB_FILE)
    c = conn.cursor()

    print "Lists data

.\n"
    sql = "select * from stocks order by price"
    c.execute(sql)
    for row in c:
        print(row)

    conn.commit()
    c.close()


def clearTableData():
    conn = sqlite3.connect(DB_FILE)
    c = conn.cursor()

    sql = "delete from stocks"
    c.execute(sql)

    print "All data are deleted

.\n"
    conn.commit()
    c.close()

def insertData():
    conn = sqlite3.connect(DB_FILE)
    c = conn.cursor()

    insertData = "insert into stocks values ('2006-01-05','BUY','RHAT',100,35.14)"
    c.execute(insertData)

    # Never do this -- insecure!
    #    symbol = 'IBM'
    #    c.execute("

where symbol = '%s'" % symbol)
    # Do this instead
    #    t = (symbol,)
    #    c.execute('select * from stocks where symbol=?', t)

    insertSql = 'insert into stocks values (?,?,?,?,?)'
    for t in [('2006-03-28', 'BUY', 'IBM', 1000, 45.00),
              ('2006-04-05', 'BUY', 'MSOFT', 1000, 72.00),
              ('2006-04-06', 'SELL', 'IBM', 500, 53.00),
             ]:
        c.execute(insertSql, t)

    print "Set data into table stocks

.\n"
    conn.commit()
    c.close()

def initTable():
    conn = sqlite3.connect(DB_FILE)
    c = conn.cursor()

    createTable = "create table stocks (date text, trans text, symbol text, qty real, price real)"
    c.execute(createTable)
    print "Created table stocks

.\n"

    conn.commit()
    c.close()


'''
    运行例子:   ./sqllitetest.py -c init
'''
if __name__ =="__main__":

    from optparse import OptionParser
    parser = OptionParser()

    parser.add_option("-c", "--command", action="store",
                  dest="cmd",
                  default="init",
                  type="string",
                  help="Runs functions based on commands. Available commands are init,list,data,deleteAll ")

    options, args = parser.parse_args()

    cmd = options.cmd

    if(cmd=="init"):
        initTable()

    if(cmd=="deleteAll"):
        clearTableData()

    if(cmd=="data"):
        insertData()

    if(cmd=="list"):
        listData()

posted on 2011-02-14 00:02 Chenyunshi 阅读(930) 评论(0) 编辑收藏引用所属分类: Python2.5/2.6

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yunshichen

Python 数据库操作

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