rov-offline/db_helper.py

import redis
import psycopg2
import pymysql
from config import set_config
from log import Log

config_ = set_config()
log = Log()


class RedisHelper(object):
    def __init__(self):
        """
        初始化redis连接信息
        redis_info: redis连接信息, 格式：dict, {'host': '', 'port': '', 'password': ''}
        """
        redis_info = config_.REDIS_INFO
        self.host = redis_info['host']
        self.port = redis_info['port']
        self.password = redis_info['password']

    def connect(self):
        """
        连接redis
        :return: conn
        """
        pool = redis.ConnectionPool(host=self.host,
                                    port=self.port,
                                    password=self.password,
                                    decode_responses=True)
        conn = redis.Redis(connection_pool=pool)
        return conn

    def key_exists(self, key_name):
        """
        判断key是否存在
        :param key_name: key
        :return: 存在-True, 不存在-False
        """
        conn = self.connect()
        return conn.exists(key_name)

    def del_keys(self, key_name):
        """
        删除key
        :param key_name: key
        :return: None
        """
        conn = self.connect()
        conn.delete(key_name)

    def get_data_from_redis(self, key_name):
        """
        读取redis中的数据
        :param key_name: key
        :return: data
        """
        conn = self.connect()
        if not conn.exists(key_name):
            # key不存在
            return None
        data = conn.get(key_name)
        return data

    def set_data_to_redis(self, key_name, value, expire_time=24*3600):
        """
        新增数据
        :param key_name: key
        :param value: 元素的值 videoId
        :param expire_time: 过期时间，单位：s，默认1天
        :return: None
        """
        conn = self.connect()
        conn.set(key_name, value, ex=expire_time)

    def add_data_with_zset(self, key_name, data, expire_time=7*24*3600):
        """
        新增数据，有序set
        :param key_name: key
        :param data: 元素的值及对应分数 type-dict  {value: score}
        :param expire_time: 过期时间，单位：s，默认7天
        :return: None
        """
        conn = self.connect()
        conn.zadd(key_name, data)
        # 设置过期时间
        conn.expire(key_name, expire_time)

    def get_data_zset_with_index(self, key_name, start, end, desc=True, with_scores=False):
        """
        根据索引位置获取元素的值
        :param key_name: key
        :param start: 索引起始点 闭区间，包含start
        :param end: 索引结束点 闭区间，包含end
        :param desc: 分数排序方式，默认从大到小
        :param with_scores: 是否获取元素的分数，默认 False，只获取元素的值
        :return: data 元素值列表（不包含分数）,value(videoId)类型转换为int, 包含分数时不进行类型转换
        """
        conn = self.connect()
        if not conn.exists(key_name):
            return None
        data = conn.zrange(key_name, start, end, desc, with_scores)
        if with_scores:
            return data
        else:
            return [eval(value) for value in data]

    def get_score_with_value(self, key_name, value):
        """
        在zset中，根据元素的value获取对应的score
        :param key_name: key
        :param value: 元素的值
        :return: score value对应的score
        """
        conn = self.connect()
        return conn.zscore(key_name, value)

    def update_score_with_value(self, key_name, value, score, expire_time=7*24*3600):
        """
        在zset中，修改元素value对应的score
        :param key_name: key
        :param value: 元素的值
        :param score: value对应的score更新值
        :param expire_time: 过期时间，单位：s，默认7天
        """
        conn = self.connect()
        if conn.exists(key_name):
            conn.zadd(key_name, {value: score})
        else:
            # key不存在时，需设置过期时间
            conn.zadd(key_name, {value: score})
            conn.expire(key_name, expire_time)

    def remove_value_from_zset(self, key_name, value):
        """
        删除zset中的指定元素
        :param key_name: key
        :param value: 元素的值
        :return: None
        """
        conn = self.connect()
        conn.zrem(key_name, value)

    def get_index_with_data(self, key_name, value):
        """
        根据元素的值获取在有序set中的位置，按照分数倒序（从大到小）
        :param key_name: key
        :param value: 元素的值
        :return: idx 位置索引
        """
        conn = self.connect()
        return conn.zrevrank(key_name, value)

    def get_data_from_set(self, key_name):
        """
        获取set中的所有数据
        :param key_name: key
        :return: data
        """
        conn = self.connect()
        if not conn.exists(key_name):
            # key不存在
            return None
        data = conn.sscan(key_name)
        return data[1]

    def add_data_with_set(self, key_name, values, expire_time=30*60):
        """
        新增数据，set
        :param key_name: key
        :param values: 要添加的元素  类型-set
        :param expire_time: 过期时间，单位：s，默认0.5小时
        :return: None
        """
        conn = self.connect()
        conn.sadd(key_name, *values)
        # 设置过期时间
        conn.expire(key_name, expire_time)

    def data_exists_with_set(self, key_name, value):
        """
        判断元素value是否在集合key_name中
        :param key_name: key
        :param value: 需判断的元素
        :return: 存在-True, 不存在-False
        """
        conn = self.connect()
        return conn.sismember(key_name, value)

    def remove_value_from_set(self, key_name, values):
        """
        删除set中的指定元素
        :param key_name: key
        :param values: 元素的值, 类型-set
        :return: None
        """
        conn = self.connect()
        conn.srem(key_name, *values)


class HologresHelper(object):
    def __init__(self):
        """初始化hologres连接信息"""
        self.hologres_info = config_.HOLOGRES_INFO

    def get_data(self, sql):
        # 连接Hologres
        conn = psycopg2.connect(**self.hologres_info)
        # 创建游标
        cur = conn.cursor()
        # 查询数据
        cur.execute(sql)
        data = cur.fetchall()
        # 提交事务
        conn.commit()
        # 释放资源
        cur.close()
        conn.close()
        return data


class MysqlHelper(object):
    def __init__(self, mysql_info):
        """
        初始化mysql连接信息
        :param mysql_info: mysql连接信息, 格式：dict, {'host': '', 'port': '', 'user':'', 'password': '', 'db': ''}
        """
        self.host = mysql_info['host']
        self.port = mysql_info['port']
        self.user = mysql_info['user']
        self.password = mysql_info['password']
        self.db = mysql_info['db']

    def get_data(self, sql):
        """
        查询数据
        :param sql: sql语句
        :return: data
        """
        # 连接数据库
        conn = pymysql.connect(
            host=self.host,
            port=self.port,
            user=self.user,
            password=self.password,
            db=self.db,
            charset='utf8'
        )
        # 创建游标
        cursor = conn.cursor()
        try:
            # 执行SQL语句
            cursor.execute(sql)
            # 获取查询的所有记录
            data = cursor.fetchall()
        except Exception as e:
            return None
        # 关闭游标对象
        cursor.close()
        # 关闭数据库连接
        conn.close()
        return data


if __name__ == '__main__':
    redis_helper = RedisHelper()
    key = 'com.weiqu.video.hot.recommend.item.score.20210901'
    res = redis_helper.get_score_with_value(key, 90797)
    print(res)