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@@ -0,0 +1,83 @@
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import json
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import os
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# 以下为 V1.0 原有代码,完全未修改
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# 定义数据文件路径
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HOUSE_FILE = "./data/houses.json"
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def init_db():
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"""
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初始化数据文件:如果houses.json不存在,创建并写入空列表
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空间复杂度:O(1)(仅创建空文件)
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"""
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# 确保data文件夹存在
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os.makedirs("./data", exist_ok=True)
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# 如果文件不存在,创建并写入空列表
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if not os.path.exists(HOUSE_FILE):
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with open(HOUSE_FILE, 'w', encoding='utf-8') as f:
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json.dump([], f, ensure_ascii=False, indent=4)
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def read_houses():
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"""
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读取所有房源数据
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时间复杂度:O(n)(n为房源数,JSON解析耗时与数据量正相关)
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空间复杂度:O(n)(存储所有房源数据)
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return: 房源列表(每个元素是字典)
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"""
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init_db() # 先确保文件存在
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with open(HOUSE_FILE, 'r', encoding='utf-8') as f:
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return json.load(f)
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def write_houses(houses):
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"""
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写入房源数据到JSON文件
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时间复杂度:O(n)(n为房源数,JSON序列化耗时与数据量正相关)
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空间复杂度:O(1)(仅写入操作,无额外存储)
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param houses: 要写入的房源列表
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"""
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with open(HOUSE_FILE, 'w', encoding='utf-8') as f:
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json.dump(houses, f, ensure_ascii=False, indent=4)
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# V2.0 新增代码:栈数据读写
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# V2.0 新增:栈数据文件配置
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STACK_FILE = "./data/stack_data.json"
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# V2.0 新增:栈数据初始化与读写
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def init_stack_db():
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"""
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初始化栈数据文件:若不存在则创建,区分操作记录栈/浏览历史栈
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"""
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os.makedirs("./data", exist_ok=True)
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if not os.path.exists(STACK_FILE):
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init_data = {
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"operation_stack": [],
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"browse_stack": []
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}
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with open(STACK_FILE, 'w', encoding='utf-8') as f:
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json.dump(init_data, f, ensure_ascii=False, indent=4)
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def read_stack(stack_type):
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"""
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读取指定类型的栈数据
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:param stack_type: operation(操作记录)/ browse(浏览历史)
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"""
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init_stack_db()
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with open(STACK_FILE, 'r', encoding='utf-8') as f:
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data = json.load(f)
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stack_key = f"{stack_type}_stack"
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return data.get(stack_key, [])
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def write_stack(stack_type, new_stack):
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"""
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写入指定类型的栈数据到文件
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"""
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init_stack_db()
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# 读取原有数据,避免覆盖另一个栈
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with open(STACK_FILE, 'r', encoding='utf-8') as f:
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data = json.load(f)
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stack_key = f"{stack_type}_stack"
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data[stack_key] = new_stack
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with open(STACK_FILE, 'w', encoding='utf-8') as f:
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json.dump(data, f, ensure_ascii=False, indent=4)
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