python下向sqlite插入记录，是否存在过记录的判断不起作用

每次都是返回 False

import sqlite3

conn = sqlite3.connect('urls.db')
cursor = conn.cursor()
cursor.execute('CREATE TABLE IF NOT EXISTS  urls (id integer primary key autoincrement, link text)') 

def url_exists(url):
    sql_cmd = '''select * from urls where link = '%s' ''' % url
    cursor.execute(sql_cmd)
    res = cursor.fetchall()
    if len(res) > 0 :
        print '%s exists' % url
        return True
    else:
        sql_cmd_2 = '''insert into urls(link) values('%s') ''' % url
        cursor.execute(sql_cmd_2)
        print '%s added' % url
        return False
    cursor.close()
    conn.commit()
    conn.close()

url_status = url_exists('example.com')
print url_status

# Python

怪我咯2165 天前458 次浏览

import sqlite3 conn = sqlite3.connect('/tmp/urls.db') cursor = conn.cursor() cursor.execute('CREATE TABLE IF NOT EXISTS urls (id integer primary key autoincrement, link text)') def url_exists(url): sql_cmd = '''select * from urls where link = '%s' ''' % url cursor.execute(sql_cmd) res = cursor.fetchall() suc = True if len(res) > 0 : print '%s exists' % url suc = True else: sql_cmd_2 = '''insert into urls(link) values('%s') ''' % url cursor.execute(sql_cmd_2) print '%s added' % url suc = False cursor.close() conn.commit() conn.close() return suc url_status = url_exists('example.com') print url_status

python下向sqlite插入记录，是否存在过记录的判断不起作用

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