regexp python 和 sqlite 的问题

2021-12-08 00:00:00 python regex sqlite

我尝试在 sqlite 数据库上使用带有 python 的正则表达式检查具有模式的字符串.当我尝试搜索字符串时,我遇到了问题,其中包含 " 和使用 " 的模式例如:

I try to check a string with a pattern using a regex with python on a sqlite database. I have problem when I try de search string having " with a patern using " For exemple:

cur.execute("insert into articles(id,subject) values (1,'aaa"test"')")
cur.execute("select id,subject from articles where id = 1")
print (cur.fetchall())

cur.execute("select subject from articles where  subject regexp '"test"' ")
print (cur.fetchall())

我应该 " 在正则表达式之前编译器不喜欢...语法错误

I should " before regexp other way compiler dont like... syntaxe error

[(1, 'aaa"test"')]
[] <????? should found 

有人知道怎么做吗?

我的正则表达式函数:con.create_function("regexp", 2, regexp)

My regexp function :con.create_function("regexp", 2, regexp)

推荐答案

使用参数化的 sql.然后你不需要自己转义引号:

Use parametrized sql. Then you don't need to escape the quotes yourself:

import sqlite3
import re

def regexp(expr, item):
    reg = re.compile(expr)
    return reg.search(item) is not None

conn = sqlite3.connect(':memory:')
conn.create_function("REGEXP", 2, regexp)
cursor = conn.cursor()
cursor.execute('CREATE TABLE foo (bar TEXT)')
cursor.executemany('INSERT INTO foo (bar) VALUES (?)',[('aaa"test"',),('blah',)])
cursor.execute('SELECT bar FROM foo WHERE bar REGEXP ?',['"test"'])
data=cursor.fetchall()
print(data)

收益

[(u'aaa"test"',)]

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