(2)编程与Mongo数据库连接,对数据库的记录进行增、删、改、查等操作
时间: 2023-06-27 13:06:14 浏览: 105
要连接Mongo数据库,需要使用MongoDB的官方驱动程序。在Python中,可以使用PyMongo库来实现MongoDB的连接和操作。
首先,需要安装PyMongo库:
```
pip install pymongo
```
然后,可以使用以下代码来连接Mongo数据库:
```python
import pymongo
# 创建MongoDB客户端
client = pymongo.MongoClient("mongodb://localhost:27017/")
# 获取数据库对象
db = client["mydatabase"]
```
其中,"mongodb://localhost:27017/"是MongoDB的默认连接地址,"mydatabase"是要连接的数据库名称。
接下来,可以使用`db`对象进行对数据库的操作。以下是一些常用的操作:
1. 插入数据
```python
# 获取集合对象
collection = db["mycollection"]
# 插入一条数据
data = {"name": "张三", "age": 18}
result = collection.insert_one(data)
print(result.inserted_id)
# 插入多条数据
data_list = [
{"name": "李四", "age": 20},
{"name": "王五", "age": 22},
]
result = collection.insert_many(data_list)
print(result.inserted_ids)
```
2. 查询数据
```python
# 查询一条数据
result = collection.find_one()
print(result)
# 查询多条数据
result = collection.find()
for data in result:
print(data)
```
可以使用查询条件来筛选数据:
```python
# 查询age等于18的数据
result = collection.find({"age": 18})
for data in result:
print(data)
```
3. 更新数据
```python
# 更新一条数据
condition = {"name": "张三"}
new_data = {"$set": {"age": 20}}
result = collection.update_one(condition, new_data)
print(result.modified_count)
# 更新多条数据
condition = {"age": {"$lt": 20}}
new_data = {"$set": {"age": 20}}
result = collection.update_many(condition, new_data)
print(result.modified_count)
```
4. 删除数据
```python
# 删除一条数据
condition = {"name": "张三"}
result = collection.delete_one(condition)
print(result.deleted_count)
# 删除多条数据
condition = {"age": {"$lt": 20}}
result = collection.delete_many(condition)
print(result.deleted_count)
```
以上就是Mongo数据库的基本操作。在实际开发中,还可以根据需求进行更复杂的查询、更新和删除操作。
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