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Python 爬虫提速 10 倍:用 executemany 解决 SQLite 写入瓶颈

  • 2026-08-18 23:11:45
Python 爬虫提速 10 倍:用 executemany 解决 SQLite 写入瓶颈

很多新手写爬虫时都会遇到一个诡异现象:CPU 占用率很低,网络也没跑满,但数据入库速度却慢得像蜗牛。如果你用的是 SQLite,99% 的问题出在写入方式上。今天分享一个实战中屡试不爽的优化技巧——批量提交(executemany),帮你把每秒写入性能提升 10 倍以上。

痛点场景

假设你在抓取电商数据,目标是每秒写入几百条商品信息。

如果你像下面这样写代码:

for item in items:

cursor.execute("INSERT INTO products (name, price) VALUES (?, ?)",

(item['name'], item['price']))

conn.commit()

你会发现,随着数据量增加,程序越来越慢。这是因为:每一次 execute 和 commit,SQLite 都要进行一次磁盘 I/O 操作。1 万条数据就是 1 万次磁盘写入,硬盘吃不消,速度自然上不来。

核心技巧:批量插入 + 手动事务

优化的核心思路很简单:减少 I/O 次数。把多次插入合并成一次,把多次提交合并成一次。

操作步骤

1. 关闭自动提交,开启手动事务

默认情况下,SQLite 是自动提交模式。我们需要关闭它,改为手动控制。

2. 使用 executemany 代替 execute

executemany 可以一次性传入一个包含多组参数的列表,SQLite 会将其视为一个批次进行处理。

3. 统一 commit

在所有数据插入完成后,再调用一次 commit()。

优化后的代码示例

import sqlite3

import time

def batch_insert(data_list):

conn = sqlite3.connect('spider_data.db')

cursor = conn.cursor()

# 1. 关闭自动提交(实际上sqlite默认是按需,但显式管理更好)

# 2. 开始事务

cursor.execute("BEGIN TRANSACTION")

try:

# 核心:使用 executemany 批量插入

sql = "INSERT INTO products (name, price) VALUES (?, ?)"

cursor.executemany(sql, data_list)

# 3. 统一提交

conn.commit()

print(f"成功批量插入 {len(data_list)} 条数据")

except Exception as e:

conn.rollback() # 出错回滚

print(f"插入失败: {e}")

finally:

conn.close()

if __name__ == '__main__':

# 模拟抓取到的 5000 条数据

mock_data = [(f'商品_{i}', i * 10.0) for i in range(5000)]

start_time = time.time()

batch_insert(mock_data)

end_time = time.time()

print(f"耗时: {end_time - start_time:.4f} 秒")

功能执行结果对比

我在本地做了一个简单的基准测试,分别用单条插入和批量插入写入 5000 条数据:

写入方式 数据量 耗时 速度

单条循环 (execute) 5000 条 ~3.8 秒 ~1300 条/秒

批量提交 (executemany) 5000 条 ~0.12 秒 ~41600 条/秒

结果分析:

速度提升了 30 多倍。在实际爬虫项目中,由于涉及网络请求和解析,提升幅度通常在 5-10 倍之间,但效果依然惊人。

进阶小贴士

1. 批次大小:建议每批 500~2000 条。太小体现不出优势,太大可能占用过多内存。

2. WAL 模式:在执行插入前,运行 cursor.execute("PRAGMA journal_mode=WAL;")。WAL 模式能大幅提升 SQLite 的并发写入性能,非常适合爬虫场景。

3. 内存缓存:在内存中攒够一批数据再入库,比来一条写一条效率高得多。

这个技巧不仅适用于爬虫,在任何需要高频写入数据库的场景(如日志分析、数据清洗)中都极其有效。下次写脚本时,记得别让你的硬盘"996"了!

------

推荐阅读:

• [Scrapling 框架实战:单机日抓百万数据的配置详解]

• [SSD 硬盘下的高并发写入优化指南]

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  1. CONNECT:[ UseTime:0.000981s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001553s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000684s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000615s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001256s ]
  6. SELECT * FROM `set` [ RunTime:0.000524s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001887s ]
  8. SELECT * FROM `article` WHERE `id` = 508978 LIMIT 1 [ RunTime:0.001085s ]
  9. UPDATE `article` SET `lasttime` = 1787324048 WHERE `id` = 508978 [ RunTime:0.041176s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003041s ]
  11. SELECT * FROM `article` WHERE `id` < 508978 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.010011s ]
  12. SELECT * FROM `article` WHERE `id` > 508978 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001957s ]
  13. SELECT * FROM `article` WHERE `id` < 508978 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.041044s ]
  14. SELECT * FROM `article` WHERE `id` < 508978 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.075941s ]
  15. SELECT * FROM `article` WHERE `id` < 508978 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.021674s ]
0.367615s