def robotsrulesetOfDomain(self, domain):
		'''检查domain是否在数据库中,
			否 --> (False, None)
			是 --> (True, 数据库中存储的robots.txt内容)
		'''
		exist = False
		cur = self.conn.cursor()
		# 是否存在
		cur.execute("SELECT 1 FROM Domains WHERE domain=?", (domain,))
		if cur.fetchone() :
			exist = True
		# 存在的话,结果是什么
		cur.execute("SELECT rules FROM Domains,Rulesets "
			"WHERE domain=? AND Domains.did=Rulesets.did"
			,(domain,) )
		ruleset = cur.fetchone()
		return (exist, ruleset)
def set_add_spinboxes_maximum_on_label_change(self):
        nbits = self.current_label.end - self.current_label.start  # Use Bit Start/End for maximum calc.
        if nbits >= 32:
            nbits = 31
        max_val = 2 ** nbits - 1
        self.ui.sBAddRangeStart.setMaximum(max_val - 1)
        self.ui.sBAddRangeEnd.setMaximum(max_val)
        self.ui.sBAddRangeEnd.setValue(max_val)
        self.ui.sBAddRangeStep.setMaximum(max_val)
        self.ui.spinBoxLowerBound.setMaximum(max_val - 1)
        self.ui.spinBoxUpperBound.setMaximum(max_val)
        self.ui.spinBoxUpperBound.setValue(max_val)
        self.ui.spinBoxBoundaryNumber.setMaximum(int(max_val / 2) + 1)
        self.ui.spinBoxRandomMinimum.setMaximum(max_val - 1)
        self.ui.spinBoxRandomMaximum.setMaximum(max_val)
        self.ui.spinBoxRandomMaximum.setValue(max_val)