psycopg2:用一个查询插入多行 [英] psycopg2: insert multiple rows with one query

问题描述

我需要用一个查询插入多行(行数不固定)，所以我需要像这样执行查询:

I need to insert multiple rows with one query (number of rows is not constant), so I need to execute query like this one:

INSERT INTO t (a, b) VALUES (1, 2), (3, 4), (5, 6);

我知道的唯一方法是

args = [(1,2), (3,4), (5,6)]
args_str = ','.join(cursor.mogrify("%s", (x, )) for x in args)
cursor.execute("INSERT INTO t (a, b) VALUES "+args_str)

但我想要一些更简单的方法.

but I want some simpler way.

推荐答案

我构建了一个程序，可以将多行插入到位于另一个城市的服务器中.

I built a program that inserts multiple lines to a server that was located in another city.

我发现使用这种方法比 executemany 快 10 倍左右.在我的例子中 tup 是一个包含大约 2000 行的元组.使用这个方法大概花了10秒:

I found out that using this method was about 10 times faster than executemany. In my case tup is a tuple containing about 2000 rows. It took about 10 seconds when using this method:

args_str = ','.join(cur.mogrify("(%s,%s,%s,%s,%s,%s,%s,%s,%s)", x) for x in tup)
cur.execute("INSERT INTO table VALUES " + args_str) 

使用此方法时需要 2 分钟:

and 2 minutes when using this method:

cur.executemany("INSERT INTO table VALUES(%s,%s,%s,%s,%s,%s,%s,%s,%s)", tup)

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