python - pymongo 含有子条件的操作 应该怎么写？

Question

mongodb pymongo：
有两条记录是这样

{"a":"AAA" , "b":[ {"b11": "b11value" ,"b12":"b12value"} , { "b21":"b21value" , "b22":"b22value" } ]}

{"a":"BBB" , "b":[ {"b11": "b11value" ,"b12":"b12value"} , { "b21":"b21value" , "b22":"b22value" } ]}

我想更新a为AAA且b中b11的值为b11value的值为b11111111value:
结果应该是这样：

{"a":"AAA" , "b":[ {"b11": "b11111111value" ,"b12":"b12value"} , { "b21":"b21value" , "b22":"b22value" } ]}

{"a":"BBB" , "b":[ {"b11": "b11value" ,"b12":"b12value"} , { "b21":"b21value" , "b22":"b22value" } ]}

以及把a为AAA且b中b11的值为b11value的（b11删除）
结果应该是这样：

{"a":"AAA" , "b":[ { "b21":"b21value" , "b22":"b22value" } ]}

{"a":"BBB" , "b":[ {"b11": "b11value" ,"b12":"b12value"} , { "b21":"b21value" , "b22":"b22value" } ]}

一个更新，一个是删除
这两个怎么写？
sql语句应该怎么写？谢谢

Answer 1

In the example, c is your collection name.

First one:

db.c.update(
    {'a': 'AAA', 'b': {'$elemMatch': {'b11': 'b11value'}}}, 
    {'$set': {'b.$.b11': 'b11111111value'}})

Second one:

db.c.update(
    {'a':'AAA'}, 
    {'$pull': {'b': {'b11': 'b11111111value'}}})

Used $elemMatch,$set,$pullthree modifiers.