mysql，redis，monggodb，python交互

"""
    笔记
    1.pymysql



    2.视图（主要是用来查询）：
        select 语句运行之后的一个结果集  就是一条查询语句


        就是一个虚拟表 减少sql语句的复杂性 还能提高可读性 方便查询


    定义视图：create view 视图名字 as select 语句
    查看视图：show tables；
    使用视图：select * from 视图名字
    删除视图：drop vlew 视图名字

    有时间看看docker容器

    作业 把redis数据库列表封装
"""
import pymysql

# 自带事务要自己关闭
# 一定要添加库不然会报错
# 要写异常
db_config = {
    "host": "127.0.0.1",
    "port": 3306,
    "user": "root",
    "password": "qwe123",
    "db": "xiwen",
    "charset": "utf8",
}
# 1. connect：连接    获取链接对象（ip port user password db utf—8）
conn = pymysql.connect(**db_config)
# 2. 游标对像  就像c里面的指针
cur = conn.cursor()
# 查询
sql = "select * from task1"
# 添加  str嵌套需要注意
# sql = "insert into task1 values(9,'fafa',19,1)"
try:
    # 执行sql语句
    ry = cur.execute(sql)
    # 查看一条
    # print(cur.fetchone())
    # 查看多条  自己指定条数
    # print(cur.fetchmany(3))
    # 全部显示出来  一般不会这样用,数据太多会崩溃的
    print(cur.fetchall())
except Exception as e:
    print(e)
    # 回滚数据 回滚到没有操作之前
    conn.rollback()
# 如果没有出错就提交
else:
    conn.commit()
# 必须执行
finally:
    # 关闭游标
    cur.close()
    # 关闭连接
    conn.close()

# # 事务的提交
# conn.commit()
#
# # 关闭游标
# cur.close()
#
# # 关闭连接
# conn.close()









# import redis
#
#
# class Redis:
#     def __init__(self, db=0):
#         self.client = redis.StrictRedis(host="127.0.0.1", decode_responses=True)
#         self.db = db
#
#     # 增
#     def lpush(self, key, *data, lpush=True):
#         if lpush:
#             self.client.lpush(key, data)
#         elif lpush == False:
#             self.client.rpush(key, data)
#
#     # 查
#     def get(self, key, start_index, end_index=None):
#         if end_index:
#             return self.client.lrange(key, start_index, end_index)
#         else:
#             return self.client.lindex(key, start_index)
#
#     # 改
#     def lset(self, key, index, value):
#         self.client.lset(key, index, value)
#
#     # 删
#     def pop(self, key, rpop=True):
#         if rpop:
#             self.client.rpop(key)
#         else:
#             self.client.lpop(key)
#
#     def lrem(self, key, a, value):
#         self.client.lrem(key, a, value)
#
#
# if __name__ == '__main__':
#     red = Redis()
# 增
# red.lpush("lname", "1", "2")
# red.lpush("lname", "7", "8", lpush=False)
# 查
# print(red.get("lname", 0))
# print(red.get("lname", 0,-1))
# 改
# red.lset("lname", 1, "cctv")
# 删
# red.pop("lname", rpop=False)
# red.lrem("lname",0,"cctv")
























# import pymongo
#
# # 建立连接
# client = pymongo.MongoClient("127.0.0.1", 27017)
# # 指定数据库
# xiwen = client["xiwen"]
# # 指定集合
# class51 = xiwen["class51"]

# 增
# 增加一条
# class51.insert_one({"name":"fafa","age":18})
# 增加多条
# class51.insert_many([{"name":"小明","age":18},{"name":"小红","age":19}])

# 查
# 查一条
# find = class51.find_one({"name": "小明"})
# 查多条
# find = class51.find()
# for i in find:
#     print(i)

# 改
# 修改一条
# update = class51.update_one({"name": "小明"}, {"$set": {"name": "小王"}})
# 修改多条
# update = class51.update_many({"age": 18}, {"$set": {"name": "小李"}})

# 删
# 删一条
# class51.delete_one({"name": "小明"})
# 删除多条或全部
# class51.delete_many({"name": "小红"})

# find = class51.find()
# for i in find:
#     print(i)

import pymongo


class MongoDB:
    def __init__(self, database, collection):
        # 建立连接
        self.client = pymongo.MongoClient("127.0.0.1", 27017)
        # 指定数据库库
        self.xiwen = self.client[database]
        # 指定集合
        self.col = self.xiwen[collection]

    # 增
    def insert(self, data, onlyone=True):
        if onlyone:
            # 字典
            self.col.insert_one(data)
        elif onlyone == False:
            # 列表
            self.col.insert_many(data)

    # 查
    def find(self, onlyone=True):
        if onlyone:
            find = self.col.find_one()
            print(find)
        elif onlyone == False:
            find = self.col.find()
            for i in find:
                print(i)

    # 改
    def update(self, data, new_data, onlyone=True):
        if onlyone:
            self.col.update_one(data, {"$set": new_data})
        elif onlyone == False:
            self.col.update_many(data, {"$set": new_data})

    # 删
    def delete(self, data, onlyone=True):
        if onlyone and data != {}:
            self.col.delete_one(data)
        else:
            self.col.delete_many(data)


if __name__ == '__main__':
    MG = MongoDB("xiwen", "students")
    # MG.insert({"name": "希文"})  # 添加一条数据
    # MG.insert([{"name": "小明", "age": 18}, {"name": "小红", "age": 19}],False)   # 添加多条数据
    # MG.update({"name": "小红"}, {"name": "小李"})
    # MG.update({"name": "希文"}, {"name": "小明"}, False)
    MG.delete({"name": "小明"}, False)
    MG.find(False)