[url=http://wiki.python.org/moin/DatabaseProgramming/]Python DB API[/url], don't do this:
# Do NOT do it this way.
cmd = "update people set name='%s' where id='%s'" % (name, id) curs.execute(cmd)
Instead, do this:
cmd = "update people set name=%s where id=%s" curs.execute(cmd, (name, id))
Note that the placeholder syntax depends on the database you are using.
'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:
>>> import MySQLdb; print MySQLdb.paramstyle format >>> import psycopg2; print psycopg2.paramstyle pyformat >>> import sqlite3; print sqlite3.paramstyle qmark
So if you are using MySQL or PostgreSQL, use %s (even for numbers and other non-string values!) and if you are using SQLite use ?
机械节能产品生产企业官网模板...
大气智能家居家具装修装饰类企业通用网站模板...
礼品公司网站模板
宽屏简约大气婚纱摄影影楼模板...
蓝白WAP手机综合医院类整站源码（独立后台）...
