如何使用python mysqldb一次插入多行
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How to use python mysqldb to insert many rows at once
提问by Tampa
I have a list of lists, e.g [['a','b'],['c','d']].
我有一个列表列表，例如[['a','b'],['c','d']].
I have a table called Tand two fields F1, F2. The first item in the field list maps to F1, second to F2.
我有一个名为的表T和两个字段F1，F2。字段列表中的第一项映射到F1，第二项映射到F2。
How can I insert rows for each inner list in a single command or call, rather than using a for loop like this?
如何在单个命令或调用中为每个内部列表插入行，而不是使用像这样的 for 循环？
for i in [['a','b'],['c','d']]:
c.execute("insert into T (F1,F2) values (%s, %s)", (i[0], i[1]))
采纳答案by zenpoy
From MySQLdb User's Guide:
来自MySQLdb 用户指南：
c.executemany(
"""INSERT INTO breakfast (name, spam, eggs, sausage, price)
VALUES (%s, %s, %s, %s, %s)""",
[
("Spam and Sausage Lover's Plate", 5, 1, 8, 7.95 ),
("Not So Much Spam Plate", 3, 2, 0, 3.95 ),
("Don't Wany ANY SPAM! Plate", 0, 4, 3, 5.95 )
] )
so in your case:
所以在你的情况下：
c.executemany("insert into T (F1,F2) values (%s, %s)",
[('a','b'),('c','d')])
回答by Rems
It's possible to insert all rows in one single statement like @adamhajari, and avoid sql injections like @zenpoy, at the same time. You just need to create a big insert statement and let mysqldb's executedo the formatting.
可以像@adamhajari 这样在一条语句中插入所有行，同时避免像@zenpoy 这样的sql 注入。您只需要创建一个大的插入语句并让 mysqldbexecute进行格式化。
values_to_insert = [('a','b'),('c','d')]
query = "INSERT INTO T (F1, F2) VALUES " + ",".join("(%s, %s)" for _ in values_to_insert)
flattened_values = [item for sublist in values_to_insert for item in sublist]
c.execute(query, flattened_values)
Not super readable, but can be slightly faster than executemany (I tried inserting batches of 50000 rows in a local DB, executemany was 20% slower).
不是超级可读，但可以比 executemany 稍快（我尝试在本地数据库中插入 50000 行的批次，executemany 慢了 20%）。
回答by PHPJungle
def multiple_insert(cursor, table, cols, rows):
sql_insert = 'INSERT INTO %s(%s) values %s' % (
table,
','.join(cols),
','.join('(%s , %s)' for _ in rows)
)
values = [_ for r in rows for _ in r]
cursor.execute(sql_insert, values)
# eg:
rows = [(a1 , b1),(a2 , b2),(a3 , b3)]
multiple_insert(cursor, 'your_table',('col1', 'col2'), rows)
conn.commit()
