pymongo批量增删改查

最新推荐文章于 2024-08-28 17:04:38 发布

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最新推荐文章于 2024-08-28 17:04:38 发布

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CC 4.0 BY-SA版权

文章标签：数据库

原文链接：http://www.cnblogs.com/adamans/articles/10492239.html

本文详细介绍了使用pymongo库进行MongoDB数据库操作的方法，包括建立唯一索引、批量插入、更新、查询和删除记录的具体实现，适用于大规模数据处理场景。

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from mongoengine.connection import get_db, connect
from pymongo import MongoClient, ASCENDING, UpdateOne, InsertOne, DeleteOne, ReplaceOne
from pymongo.errors import BulkWriteError



# pymongo建立索引
client = MongoClient('120.xx.xx.xx:20002', username='xxx', password='xxxx')
db = client.annosys
image_db = db['image']
image_db.create_index([('image_id', ASCENDING)], unique=True)
image_index = sorted(list(image_db.index_information()))
print(image_index)

# pymongo批量插入和批量更新
mdb = MongoClient('120.xx.xx.xx:20002', username='xxx', password='xxxx')
db_name = mdb['db_name']

try:
    lines = [此处填写数据列表]
    image_batch = []
    pick_batch = []

    for idx, line in enumerate(lines):
        image_batch.append(UpdateOne(
            {'image_id': line.get("id")}, {
                '$set': {
                    'url': line.get("url"),
                    'width': line.get("width"),
                    'height': line.get("height")
                },
                '$addToSet': {
                    'datasets': line.get("dataset_id")
                }
            },
            upsert=True
        ))

        pick_batch.append(InsertOne(
            {'task_id': line.get("task_id"), 'image_id': line.get("id")}
        ))

        if idx % 2000 == 0:
            try:
                db_name['image'].bulk_write(image_batch)
                image_batch = []
                db_name['image_pick'].bulk_write(pick_batch)
                pick_batch = []
            except BulkWriteError as bwe:
                print("mongo error:", bwe.details)

    db_name['image'].bulk_write(image_batch)
    db_name['image_pick'].bulk_write(pick_batch)

except Exception as e:
    print("Exception:", e)


# pymongo批量查询
brand_images = mdb['goodlook']['brand_images'].find({"image_id": {"$in": image_ids}}) 
#image_ids是图片信息列表

# pymongo批量删除
brand_images = mdb['goodlook']['brand_images'].find({"image_id": {"$in": image_ids}}) 
mdb['goodlook']['brand_images'].remove({"image_id": {"$in": image_ids}})

# pymongo批量杂糅操作
requests = [InsertOne({'y': 1}), DeleteOne({'x': 1}),ReplaceOne({'w': 1}, {'z': 1}, upsert=True)]
result = db.test.bulk_write(requests)

转载于:https://www.cnblogs.com/adamans/articles/10492239.html