如何将一个查询的输出用于SQLITE中的另一个查询？

Question

我试图使用一个查询的输出到另一个查询，但是当我选择一个元素，它给了我输出，

[(8, u'O', 2, 16)] 
[(8,)] 
[ ] 

所以第三个查询工作不正常。我认为问题在于我打印的是单个数字，但输出是数字列表，我试图修复它，但仍然卡在这里。

def OnClick(self, event):          
    name = event.GetEventObject().GetLabelText() 
    cursor= self.conn.execute("SELECT * FROM ELEMENT where SYMBOL=='%s'"%(name)) 
    elements = cursor.fetchall() 
    print elements 
    cursor= self.conn.execute("SELECT ATOMIC_NUMBER FROM ELEMENT where SYMBOL IN ('%s')"%(name)) 
    numbers = cursor.fetchall() 
    print numbers 
    cursor= self.conn.execute("SELECT * FROM LINK where ELEMENT_NUMBER = 'numbers'") 
    mnumbers = cursor.fetchall() 
    print mnumbers 
    #cursor= self.conn.execute("SELECT * FROM LINK where ELEMENT_NUMBER IN (SELECT ATOMIC_NUMBER FROM ELEMENT where SYMBOL IN ('%s')%(SYMBOL))") 
    #cursor= self.conn.execute("SELECT * FROM MOLECULE where MOL_NUMBER=='%d'"%(Mnumbers)) 
    #molecules = cursor.fetchall() 
#print molecules 

Answer 1

蟒蛇sqlite3 documentation说，就在上面，你不应该做%s替代与你的价值观。

正确的方式来获得变量值到一个查询与SQL参数：

...execute("SELECT * FROM ELEMENT where SYMBOL==?", [name]) 

...execute("SELECT ATOMIC_NUMBER FROM ELEMENT where SYMBOL = ?", [name]) 

atomicnumber = numbers[0][0] # extract value in first column of first row 
...execute("SELECT * FROM LINK where ELEMENT_NUMBER = ?", [atomicnumber])