Pyhton中防止SQL注入的方法

代码如下:

c=db.cursor()
max_price=5
c.execute("""SELECT spam, eggs, sausage FROM breakfast
          WHERE price

如果按照以下写法，是容易产生SQL注入的：

代码如下:

c.execute("""SELECT spam, eggs, sausage FROM breakfast
          WHERE price

这个和PHP里的PDO是类似的，原理同MySQL Prepared Statements。

Python

Using the Python DB API, don't do this:

# Do NOT do it this way.

代码如下:

cmd = "update people set name='%s' where id='%s'" % (name, id) curs.execute(cmd)

代码如下:

cmd = "update people set name=%s where id=%s" curs.execute(cmd, (name, id))

代码如下:

'qmark' Question mark style, e.g. '...WHERE name=?' 'numeric' Numeric, positional style, e.g. '...WHERE name=:1' 'named' Named style, e.g. '...WHERE name=:name' 'format' ANSI C printf format codes, e.g. '...WHERE name=%s' 'pyformat' Python extended format codes, e.g. '...WHERE name=%(name)s'

The values for the most common databases are:

代码如下:

>>> import MySQLdb; print MySQLdb.paramstyle format >>> import psycopg2; print psycopg2.paramstyle pyformat >>> import sqlite3; print sqlite3.paramstyle qmark