从Python dict批量更新PostgreSQL

本文介绍了从Python dict批量更新PostgreSQL的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

在一个现有的PostgreSQL表中，我想UPDATE使用字典查找中的值对几个现有的列进行查找(请参见下面的dict).类似于不错的博客帖子中所述的内容.但是，我不知道如何使用Python字典来做到这一点.这是可怕的伪代码:

In an existing PostgreSQL table, I would like to UPDATE several existing columns with values from a dictionary lookup (see dict below). Somewhat like described in this nice blog post. However, I can't figure out how to do that with a Python dictionary. Here comes the terrible pseudo-code:

d = {10:'chair', 11:'table', 12:'lamp', 20:'english ivy', 21:'peace lily', 22:'spider plant'} curs.execute(""" UPDATE my_table t SET furniture = %(t.furniture)s, SET plant = %(t.plant)s""", d)

原始表如下所示:

gid | furniture | plant ----------------------- 0 | 10 | 21 1 | 11 | 20 ...

操作后，它应如下所示:

After the operation it should look like this:

gid | furniture | plant ----------------------------- 0 | chair | peace lily 1 | table | english ivy ...

这可能吗?还是我必须遍历这张桌子?

Is this possible or will I have to loop through the table?

推荐答案

尝试一下:

rows = ( {'gid': 10, 'furniture': 10, 'plant': 10}, {'gid': 20, 'furniture': 20, 'plant': 20} ) cur.executemany( ''' UPDATE myTable SET furniture = %(furniture)s, plant = %(plant)s WHERE gid = %(gid)s ''', rows )