mysql连接器通过列名而不是索引进行调用

时间:2019-01-27 05:16:48

标签: python mysql-connector-python

为了获取SELECT语句,这是我通常要做的:

stmt_select = "SELECT * FROM {0} ORDER BY id".format(tbl)
cursor.execute(stmt_select)

for row in cursor.fetchall():
    output.append("%3s | %10s | %19s | %8s |" % (
        row[0],
        row[1],
        row[2],
        row[3],
    ))

此方法的问题是我需要指定索引列而不是列名。如何访问指定列名而不是始终指定索引?最好不要指定要在for循环中获取的列名。

1 个答案:

答案 0 :(得分:1)

这是namedtuples的非常普遍的用法,您可以创建一个namedtuple-它允许访问属性。

与问题代码相关的示例:

from collections import namedtuple
DBEntity = namedtuple("DBEntity", ("first_cell","second_cell","third_cell", "fourth_cell"))
stmt_select = "SELECT * FROM {0} ORDER BY id".format(tbl)
cursor.execute(stmt_select)

for row in cursor.fetchall():
    t_row = DBEntity(*row)
    output.append("%3s | %10s | %19s | %8s |" % (
        t_row.first_cell,
        t_row.seconnd_cell,
        t_row.third_cell,
        t_row.fourth_cell,
    ))

另外(尽管可能会有些夸大其词,这取决于程序的用途)-您也可以将sqlalchemy用于ORM