我正在尝试创建如下语句:
SELECT * FROM table WHERE provider IN ('provider1', 'provider2', ...)
但是,我在使用 Django API 对其进行字符串格式化时遇到了一些问题。这是我到目前为止所拥有的:
profile = request.user.get_profile()
providers = profile.provider.values_list('provider', flat=True) # [u'provider1', u'provider2']
providers = tuple[str(item) for item in providers] # ('provider1', 'provider2')
SQL = "SELECT * FROM table WHERE provider IN %s"
args = (providers,)
cursor.execute(sql,args)
DatabaseError
(1241, 'Operand should contain 1 column(s)')
最佳答案
MySQLdb 有一个方法可以帮助解决这个问题:
文档
string_literal(...) string_literal(obj) -- converts object obj into a SQL string literal. This means, any special SQL characters are escaped, and it is enclosed within single quotes. In other words, it performs:
"'%s'" % escape_string(str(obj)) Use connection.string_literal(obj), if you use it at all. _mysql.string_literal(obj) cannot handle character sets.
用法
# connection: <_mysql.connection open to 'localhost' at 1008b2420>
str_value = connection.string_literal(tuple(provider))
# '(\'provider1\', \'provider2\')'
SQL = "SELECT * FROM table WHERE provider IN %s"
args = (str_value,)
cursor.execute(sql,args)
关于python - 如何使用 Python 对 SQL IN 子句进行字符串格式化,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11195993/