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Python之数据库实体类作为参数动态传输

  • 2026-02-06 02:30:41
Python之数据库实体类作为参数动态传输
本文介绍将数据库实体类作为参数动态传输,进一步封装实体类的操作。
首先,对实体类进行注册:
    def register_entity(self, name, entity_class):        """注册新的实体类        self.entity_map在__init__(self)中进行初始化        self.entity_map = {}        """        self.entity_map[name] = entity_class
然后,根据名称或类本身获取实体类:
    def get_entity_class(self, entity_class_or_name):        """根据名称或类本身获取实体类"""        if isinstance(entity_class_or_name, str):            entity_class = self.entity_map.get(entity_class_or_name)            if not entity_class:                available_entities = ', '.join(self.entity_map.keys())                raise ValueError(                    f"Unknown entity class: {entity_class_or_name}. "                    f"Available entities: {available_entities}")            return entity_class        else:            return entity_class_or_name
最后,封装通过实体类进行查询(新增、修改、删除操作类似):
    def query(self,              entity_class_or_name,              filters=None,              offset=0,              limit=None,              order_by=None,              distinct=False):        """动态查询方法"""        entity_class = self.get_entity_class(entity_class_or_name)        try:            """self.session在__init__(self)中进行初始化,self.session = get_default_db_service().get_db_session()"""            query = self.session.query(entity_class)            # 应用DISTINCT            if distinct:                query = query.distinct()            # 应用过滤条件            conditions = self.build_filters(entity_class, filters)            if conditions:                query = query.filter(and_(*conditions))            # 应用排序            if order_by:                if isinstance(order_by, strand hasattr(                        entity_class, order_by):                    query = query.order_by(getattr(entity_class, order_by))                elif isinstance(order_by, (listtuple)):                    order_columns = []                    for order_field in order_by:                        if isinstance(order_field, strand hasattr(                                entity_class, order_field):                            order_columns.append(                                getattr(entity_class, order_field))                        elif hasattr(order_field, '__call__'):                            order_columns.append(order_field(entity_class))                    if order_columns:                        query = query.order_by(*order_columns)            # 应用分页            query = query.offset(offset)            if limit:                query = query.limit(limit)            return query.all()        finally:            self.session.close()
对构造查询条件进行封装:
    def build_filters(self, entity_class, filters):        """构建SQLAlchemy过滤条件"""        if not filters:            return []        conditions = []        for key, value in filters.items():            if hasattr(entity_class, key):                if isinstance(value, dict):  # 复杂条件                    column = getattr(entity_class, key)                    if 'in' in value:                        conditions.append(column.in_(value['in']))                    elif 'like' in value:                        conditions.append(column.like(f"%{value['like']}%"))                    elif 'gt' in value:                        conditions.append(column > value['gt'])                    elif 'lt' in value:                        conditions.append(column < value['lt'])                    elif 'gte' in value:                        conditions.append(column >= value['gte'])                    elif 'lte' in value:                        conditions.append(column <= value['lte'])                else:  # 简单相等条件                    conditions.append(getattr(entity_class, key) == value)        return conditions
调用示例(本文将上述代码封装在DBEntityService类中):
entity_service = DBEntityService()entity_service.register_entity("City", City)entity_list = entity_service.query("City",offset=0, limit=5)print('实体类查询所有结果:')for city in entity_list:    print(city.CITY_ID, city.CITY_NAME,city.REGION_ID)
这样我们就不用每次都去构造查询条件了。

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  1. CONNECT:[ UseTime:0.000488s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000622s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001290s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000286s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000522s ]
  6. SELECT * FROM `set` [ RunTime:0.002293s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000571s ]
  8. SELECT * FROM `article` WHERE `id` = 464665 LIMIT 1 [ RunTime:0.002959s ]
  9. UPDATE `article` SET `lasttime` = 1770513636 WHERE `id` = 464665 [ RunTime:0.001747s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000730s ]
  11. SELECT * FROM `article` WHERE `id` < 464665 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002919s ]
  12. SELECT * FROM `article` WHERE `id` > 464665 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001263s ]
  13. SELECT * FROM `article` WHERE `id` < 464665 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002458s ]
  14. SELECT * FROM `article` WHERE `id` < 464665 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007304s ]
  15. SELECT * FROM `article` WHERE `id` < 464665 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002681s ]
0.103738s