PyQt - SQLAlchemy не принимает QString

Question

Я использую PyQt и SQLAlchemy, а SQLAlchemy не принимает QStrings. Есть ли способ передать ему QStrings или мне нужно каждый раз конвертировать QStrings в строки Python?

Спасибо.

Вот код:

import sip
sip.setapi('QString', 2)

from sqlalchemy import create_engine
from sqlalchemy import Table, Column, Integer, String, Float, MetaData, ForeignKey
from sqlalchemy.sql import select, and_
from PyQt4 import QtGui, QtCore

class DbUtils(object):
    def __init__(self, db_file = None, parent = None):

        self.db = None
        self.db_connection = None
        self.db_file = str(db_file)

    def db_open(self):
        self.db = create_engine('sqlite:///' + self.db_file)
        self.db_connection = self.db.connect()

    def db_close(self):
        self.db_connection.close()

    def db_create_voltdrop(self):
        metadata = MetaData()

        tb_cable_brands = Table('cable_brands', metadata,
            Column('id', Integer, primary_key=True),
            Column('brand', String)
            )
        tb_cable_types = Table('cable_types', metadata,
            Column('id', Integer, primary_key=True),
            Column('brand_id', None, ForeignKey('cable_brands.id')),
            Column('type', String),
            Column('alpha', String)
            )
        tb_cable_data = Table('cable_data', metadata,
            Column('id', Integer, primary_key=True),
            Column('type_id', None, ForeignKey('cable_types.id')),
            Column('size', String),
            Column('resistance', Float)
            )
        metadata.create_all(self.db)

    def delete_cable_brand(self, cable_brand):
        cable_brand = str(cable_brand)
        metadata = MetaData()
        metadata.bind = self.db

        tb_cable_brands = Table('cable_brands', metadata, autoload = True)

        cable_brands = select([tb_cable_brands.c.brand],
                          and_(tb_cable_brands.c.brand == cable_brand)
                          )
        row = self.db_connection.execute(cable_brands)
        data = row.fetchone()
        if str(data[0]) == cable_brand:
            cable_brands = tb_cable_brands.delete().where(tb_cable_brands.c.brand == cable_brand)
            self.db_connection.execute(cable_brands)
            return True
        else:
            return False

Answer 1

Вы можете изменить API на v2 , и PyQt всегда будет использовать обычные строки Python вместо QString с.

Редактировать

Дело 1 : Без sip.setapi

import sys
from PyQt4 import QtGui

app = QtGui.QApplication(sys.argv)
c = QtGui.QComboBox()
c.addItems(["one","two"])
print c.currentText(), type(c.currentText())
c.show()
sys.exit(app.exec_())

# Outputs
one <class 'PyQt4.QtCore.QString'>

Дело 2 : С sip.setapi

import sip
sip.setapi("QString",2)

import sys
from PyQt4 import QtGui

app = QtGui.QApplication(sys.argv)
c = QtGui.QComboBox()
c.addItems(["one","two"])
print c.currentText(), type(c.currentText())
c.show()
sys.exit(app.exec_())

# Outputs
one <type 'unicode'>