feat: 初始化项目架构

ruoyi-fastapi-backend/utils/page_util.py

@@ -0,0 +1,98 @@
+import math
+from typing import Optional, List
+
+from pydantic import BaseModel, ConfigDict
+from pydantic.alias_generators import to_camel
+
+
+class PageModel(BaseModel):
+    """
+    分页模型
+    """
+    offset: int
+    page_num: int
+    page_size: int
+    total: int
+    has_next: bool
+
+
+class PageObjectResponse(BaseModel):
+    """
+    用户管理列表分页查询返回模型
+    """
+    rows: List = []
+    page_num: int
+    page_size: int
+    total: int
+    has_next: bool
+
+
+class PageResponseModel(BaseModel):
+    """
+    列表分页查询返回模型
+    """
+    model_config = ConfigDict(alias_generator=to_camel)
+
+    rows: List = []
+    page_num: Optional[int] = None
+    page_size: Optional[int] = None
+    total: int
+    has_next: Optional[bool] = None
+
+
+def get_page_info(offset: int, page_num: int, page_size: int, count: int):
+    """
+    根据分页参数获取分页信息
+    :param offset: 起始数据位置
+    :param page_num: 当前页码
+    :param page_size: 当前页面数据量
+    :param count: 数据总数
+    :return: 分页信息对象
+    """
+    has_next = False
+    if offset >= count:
+        res_offset_1 = (page_num - 2) * page_size
+        if res_offset_1 < 0:
+            res_offset = 0
+            res_page_num = 1
+        else:
+            res_offset = res_offset_1
+            res_page_num = page_num - 1
+    else:
+        res_offset = offset
+        if (res_offset + page_size) < count:
+            has_next = True
+        res_page_num = page_num
+
+    result = dict(offset=res_offset, page_num=res_page_num, page_size=page_size, total=count, has_next=has_next)
+
+    return PageModel(**result)
+
+
+def get_page_obj(data_list: List, page_num: int, page_size: int):
+    """
+    输入数据列表data_list和分页信息，返回分页数据列表结果
+    :param data_list: 原始数据列表
+    :param page_num: 当前页码
+    :param page_size: 当前页面数据量
+    :return: 分页数据对象
+    """
+    # 计算起始索引和结束索引
+    start = (page_num - 1) * page_size
+    end = page_num * page_size
+
+    # 根据计算得到的起始索引和结束索引对数据列表进行切片
+    paginated_data = data_list[start:end]
+    has_next = True if math.ceil(len(data_list) / page_size) > page_num else False
+
+    result = PageResponseModel(
+        rows=paginated_data,
+        pageNum=page_num,
+        pageSize=page_size,
+        total=len(data_list),
+        hasNext=has_next
+    )
+
+    return result
+
+