444 lines
20 KiB
C#
444 lines
20 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Data.SqlClient;
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using System.Linq;
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using System.Text;
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using System.Text.RegularExpressions;
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namespace BLL
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{
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/// <summary>
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/// PDF 书籍模块 WebAPI 数据服务（移动端 / 第三方系统集成用）。
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/// 对应 PC 页面 HSSE/PDFDOC/PdfBookView.aspx 的完整功能：书籍、多级章节目录、章节正文（富文本 HTML）的
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/// 查询与维护（新增书籍 / 新增·编辑·删除章节 / 保存章节正文），并额外提供章节关键词检索。
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/// 数据表：Sys_PdfBook / Sys_PdfChapter（正文存 [Text] 列，为 UMeditor 生成的 HTML）。
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/// 说明：目录结构用 ParentChapterId + Level(1章 2节 3小节) 表达多级层级，SortNo 控制同级顺序。
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/// </summary>
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public static class APIPdfBookService
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{
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#region 返回模型
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/// <summary>书籍列表项。</summary>
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public class BookItem
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{
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/// <summary>书籍主键。</summary>
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public string BookId { get; set; }
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/// <summary>书名。</summary>
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public string Title { get; set; }
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/// <summary>章节总数。</summary>
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public int ChapterCount { get; set; }
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/// <summary>登记时间。</summary>
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public DateTime? CreateTime { get; set; }
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}
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/// <summary>章节目录树节点（多级嵌套）。</summary>
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public class ChapterTreeNode
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{
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/// <summary>章节主键。</summary>
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public string ChapterId { get; set; }
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/// <summary>章节名称。</summary>
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public string ChapterTitle { get; set; }
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/// <summary>层级：1章 2节 3小节。</summary>
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public int Level { get; set; }
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/// <summary>起始页码（无则为0）。</summary>
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public int PageStart { get; set; }
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/// <summary>结束页码（无则为0）。</summary>
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public int PageEnd { get; set; }
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/// <summary>是否已有正文内容（用于客户端标识可读章节）。</summary>
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public bool HasContent { get; set; }
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/// <summary>子章节列表（叶子章节为空数组）。</summary>
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public List<ChapterTreeNode> Children { get; set; }
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}
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/// <summary>章节正文详情。</summary>
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public class ChapterDetailItem
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{
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/// <summary>章节主键。</summary>
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public string ChapterId { get; set; }
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/// <summary>所属书籍主键。</summary>
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public string BookId { get; set; }
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/// <summary>所属书籍名称。</summary>
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public string BookTitle { get; set; }
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/// <summary>章节名称。</summary>
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public string ChapterTitle { get; set; }
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/// <summary>父章节主键（顶级为 null）。</summary>
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public string ParentChapterId { get; set; }
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/// <summary>层级：1章 2节 3小节。</summary>
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public int Level { get; set; }
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/// <summary>起始页码（无则为0）。</summary>
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public int PageStart { get; set; }
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/// <summary>结束页码（无则为0）。</summary>
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public int PageEnd { get; set; }
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/// <summary>正文（富文本 HTML，可直接用 WebView 渲染）。</summary>
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public string Content { get; set; }
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/// <summary>正文纯文本（去掉 HTML 标签，便于全文展示/搜索）。</summary>
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public string ContentText { get; set; }
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}
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/// <summary>章节关键词检索命中项。</summary>
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public class SearchHitItem
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{
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/// <summary>书籍主键。</summary>
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public string BookId { get; set; }
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/// <summary>书籍名称。</summary>
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public string BookTitle { get; set; }
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/// <summary>章节主键。</summary>
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public string ChapterId { get; set; }
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/// <summary>章节名称。</summary>
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public string ChapterTitle { get; set; }
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/// <summary>起始页码（无则为0）。</summary>
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public int PageStart { get; set; }
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/// <summary>结束页码（无则为0）。</summary>
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public int PageEnd { get; set; }
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/// <summary>命中片段（关键词前后各约40字）。</summary>
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public string Snippet { get; set; }
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}
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#endregion
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#region 查询：书籍列表
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/// <summary>
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/// 获取全部书籍（按登记时间升序，与页面下拉一致）。
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/// </summary>
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public static List<BookItem> GetBooks()
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{
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var list = new List<BookItem>();
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DataTable dt = SQLHelper.GetDataTableRunText(
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"SELECT b.BookId, b.Title, b.CreateTime, " +
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"(SELECT COUNT(*) FROM dbo.Sys_PdfChapter c WHERE c.BookId = b.BookId) AS ChapterCount " +
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"FROM dbo.Sys_PdfBook b ORDER BY b.CreateTime", new SqlParameter[] { });
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if (dt == null)
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return list;
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foreach (DataRow r in dt.Rows)
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{
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list.Add(new BookItem
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{
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BookId = r["BookId"] == null ? "" : r["BookId"].ToString(),
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Title = r["Title"] == null ? "" : r["Title"].ToString(),
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ChapterCount = r["ChapterCount"] == DBNull.Value ? 0 : Convert.ToInt32(r["ChapterCount"]),
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CreateTime = r["CreateTime"] == DBNull.Value ? (DateTime?)null : Convert.ToDateTime(r["CreateTime"])
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});
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}
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return list;
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}
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#endregion
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#region 查询：多级章节目录树
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/// <summary>
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/// 获取某本书的多级章节目录树（嵌套 Children，顶级为根的数组；按 SortNo 排序）。
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/// </summary>
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public static List<ChapterTreeNode> GetChapterTree(string bookId)
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{
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if (string.IsNullOrWhiteSpace(bookId))
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throw new Exception("bookId 不能为空");
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var chapters = PdfBookService.GetChapters(bookId);
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var result = new List<ChapterTreeNode>();
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if (chapters == null || chapters.Count == 0)
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return result;
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// 有正文标记（一次查询）
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var hasContentSet = new HashSet<string>();
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DataTable dt = SQLHelper.GetDataTableRunText(
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"SELECT ChapterId FROM dbo.Sys_PdfChapter " +
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"WHERE BookId = @BookId AND [Text] IS NOT NULL AND LTRIM(RTRIM([Text])) <> N''",
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new[] { new SqlParameter("@BookId", bookId) });
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if (dt != null)
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foreach (DataRow r in dt.Rows)
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hasContentSet.Add(r["ChapterId"] == null ? "" : r["ChapterId"].ToString());
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// 1) 先为每个章节建节点
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var nodeMap = new Dictionary<string, ChapterTreeNode>();
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foreach (PdfChapter c in chapters)
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{
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nodeMap[c.ChapterId] = new ChapterTreeNode
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{
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ChapterId = c.ChapterId,
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ChapterTitle = c.Title,
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Level = c.Level,
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PageStart = c.PageStart,
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PageEnd = c.PageEnd,
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HasContent = hasContentSet.Contains(c.ChapterId),
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Children = new List<ChapterTreeNode>()
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};
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}
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// 2) 按父章节挂接（父不在列表中的作为顶级）
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foreach (PdfChapter c in chapters)
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{
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var node = nodeMap[c.ChapterId];
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if (!string.IsNullOrWhiteSpace(c.ParentChapterId) && nodeMap.ContainsKey(c.ParentChapterId))
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nodeMap[c.ParentChapterId].Children.Add(node);
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else
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result.Add(node);
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}
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return result;
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}
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#endregion
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#region 查询：章节正文
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/// <summary>
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/// 获取章节正文详情（含 HTML 与纯文本）；章节不存在返回 null。
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/// </summary>
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public static ChapterDetailItem GetChapterDetail(string chapterId)
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{
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if (string.IsNullOrWhiteSpace(chapterId))
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throw new Exception("chapterId 不能为空");
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DataTable dt = SQLHelper.GetDataTableRunText(
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"SELECT c.ChapterId, c.BookId, b.Title AS BookTitle, c.ParentChapterId, c.[Level], " +
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"c.ChapterTitle, c.PageStart, c.PageEnd, c.[Text] " +
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"FROM dbo.Sys_PdfChapter c INNER JOIN dbo.Sys_PdfBook b ON c.BookId = b.BookId " +
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"WHERE c.ChapterId = @ChapterId",
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new[] { new SqlParameter("@ChapterId", chapterId) });
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if (dt == null || dt.Rows.Count == 0)
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return null;
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DataRow r = dt.Rows[0];
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string html = r["Text"] == DBNull.Value ? "" : r["Text"].ToString();
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var item = new ChapterDetailItem
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{
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ChapterId = r["ChapterId"] == null ? "" : r["ChapterId"].ToString(),
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BookId = r["BookId"] == null ? "" : r["BookId"].ToString(),
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BookTitle = r["BookTitle"] == null ? "" : r["BookTitle"].ToString(),
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ParentChapterId = r["ParentChapterId"] == DBNull.Value ? null : r["ParentChapterId"].ToString(),
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Level = r["Level"] == DBNull.Value ? 1 : Convert.ToInt32(r["Level"]),
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ChapterTitle = r["ChapterTitle"] == null ? "" : r["ChapterTitle"].ToString(),
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PageStart = r["PageStart"] == DBNull.Value ? 0 : Convert.ToInt32(r["PageStart"]),
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PageEnd = r["PageEnd"] == DBNull.Value ? 0 : Convert.ToInt32(r["PageEnd"]),
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Content = html,
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ContentText = HtmlToPlainText(html)
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};
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return item;
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}
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#endregion
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#region 查询：章节关键词检索
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/// <summary>
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/// 章节关键词检索：在章节正文中按关键词做字面匹配（正文为 HTML，匹配前先剔除标签）。
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/// bookId 可空：不传则全库检索。
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/// </summary>
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public static List<SearchHitItem> SearchChapter(string keyword, string bookId)
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{
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if (string.IsNullOrWhiteSpace(keyword))
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throw new Exception("keyword 不能为空");
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// LIKE 通配符转义（ESCAPE 字符为反斜杠）
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string esc = keyword.Replace("\\", "\\\\").Replace("%", "\\%").Replace("_", "\\_");
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var ps = new List<SqlParameter>
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{
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new SqlParameter("@Keyword", "%" + esc + "%")
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};
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string where = "c.[Text] LIKE @Keyword ESCAPE '\\'";
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if (!string.IsNullOrWhiteSpace(bookId))
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{
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where += " AND c.BookId = @BookId";
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ps.Add(new SqlParameter("@BookId", bookId));
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}
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DataTable dt = SQLHelper.GetDataTableRunText(
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"SELECT c.ChapterId, c.ChapterTitle, c.BookId, b.Title AS BookTitle, " +
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"c.PageStart, c.PageEnd, c.[Text] " +
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"FROM dbo.Sys_PdfChapter c INNER JOIN dbo.Sys_PdfBook b ON c.BookId = b.BookId " +
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"WHERE " + where + " ORDER BY b.Title, c.SortNo", ps.ToArray());
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var list = new List<SearchHitItem>();
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if (dt == null)
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return list;
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foreach (DataRow r in dt.Rows)
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{
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string html = r["Text"] == DBNull.Value ? "" : r["Text"].ToString();
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string plain = HtmlToPlainText(html);
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list.Add(new SearchHitItem
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{
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BookId = r["BookId"] == null ? "" : r["BookId"].ToString(),
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BookTitle = r["BookTitle"] == null ? "" : r["BookTitle"].ToString(),
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ChapterId = r["ChapterId"] == null ? "" : r["ChapterId"].ToString(),
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ChapterTitle = r["ChapterTitle"] == null ? "" : r["ChapterTitle"].ToString(),
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PageStart = r["PageStart"] == DBNull.Value ? 0 : Convert.ToInt32(r["PageStart"]),
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PageEnd = r["PageEnd"] == DBNull.Value ? 0 : Convert.ToInt32(r["PageEnd"]),
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Snippet = BuildSnippet(plain, keyword)
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});
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}
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return list;
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}
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/// <summary>取关键词命中片段（前后各约40字）。</summary>
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private static string BuildSnippet(string plain, string keyword)
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{
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if (string.IsNullOrEmpty(plain))
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return "";
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int idx = plain.IndexOf(keyword, StringComparison.OrdinalIgnoreCase);
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if (idx < 0)
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return plain.Length > 120 ? plain.Substring(0, 120) + "……" : plain;
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int start = Math.Max(0, idx - 40);
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int len = Math.Min(plain.Length - start, keyword.Length + 80);
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return (start > 0 ? "……" : "") + plain.Substring(start, len) + (start + len < plain.Length ? "……" : "");
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}
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/// <summary>HTML 转纯文本（去标签、解码实体、压缩空白）。</summary>
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private static string HtmlToPlainText(string html)
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{
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if (string.IsNullOrEmpty(html))
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return "";
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string s = Regex.Replace(html, "(?i)<(br|/p|/div|/li|/tr|/h[1-6])[^>]*>", "\n");
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s = Regex.Replace(s, "<[^>]+>", "");
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s = System.Net.WebUtility.HtmlDecode(s);
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s = Regex.Replace(s, "[\r\n]+", "\n");
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s = Regex.Replace(s, "[ \t]+", " ");
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return s.Trim();
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}
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#endregion
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#region 维护：书籍
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/// <summary>
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/// 新增书籍（仅书名；FilePath/TotalPages/IndexStatus 与页面一致：NULL/0/2）。
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/// </summary>
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public static string AddBook(string title, string createUser)
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{
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if (string.IsNullOrWhiteSpace(title))
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throw new Exception("书名不能为空");
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if (string.IsNullOrWhiteSpace(createUser))
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createUser = "api";
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string bookId = NewId("PB");
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SQLHelper.ExecutSql(
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"INSERT INTO dbo.Sys_PdfBook (BookId, Title, FilePath, TotalPages, IndexStatus, CreateUser, CreateTime) VALUES ('"
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+ SqlEsc(bookId) + "',N'" + SqlEsc(title.Trim()) + "',NULL,0,2,N'"
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+ SqlEsc(createUser) + "',GETDATE())");
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return bookId;
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}
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#endregion
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#region 维护：章节（新增 / 改名 / 删除 / 保存正文）
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/// <summary>
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/// 新增章节：parentChapterId 为空则为顶级章节，否则挂到指定父章节下（层级=父级+1）。
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/// SortNo 取全书当前最大值+1（与页面逻辑一致）。
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/// </summary>
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public static string AddChapter(string bookId, string parentChapterId, string chapterTitle, string createUser)
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{
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if (string.IsNullOrWhiteSpace(bookId))
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throw new Exception("bookId 不能为空");
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if (string.IsNullOrWhiteSpace(chapterTitle))
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throw new Exception("章节名称不能为空");
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int level = 1;
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if (!string.IsNullOrWhiteSpace(parentChapterId))
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{
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int parentLevel = GetInt(
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"SELECT ISNULL([Level],1) FROM dbo.Sys_PdfChapter WHERE ChapterId='" + SqlEsc(parentChapterId) + "'");
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if (parentLevel <= 0)
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throw new Exception("父章节不存在：" + parentChapterId);
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level = parentLevel + 1;
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}
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int sort = GetInt(
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"SELECT ISNULL(MAX(SortNo),0) FROM dbo.Sys_PdfChapter WHERE BookId='" + SqlEsc(bookId) + "'") + 1;
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string chapterId = NewId("CH");
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SQLHelper.ExecutSql(
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"INSERT INTO dbo.Sys_PdfChapter (ChapterId, BookId, ParentChapterId, [Level], ChapterTitle, PageStart, PageEnd, [Text], SortNo) VALUES ('"
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+ SqlEsc(chapterId) + "','" + SqlEsc(bookId) + "',"
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+ (string.IsNullOrWhiteSpace(parentChapterId) ? "NULL" : "'" + SqlEsc(parentChapterId) + "'")
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+ "," + level + ",N'" + SqlEsc(chapterTitle.Trim()) + "',NULL,NULL,N''," + sort + ")");
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return chapterId;
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}
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/// <summary>
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/// 编辑章节：仅修改章节名称。
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/// </summary>
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public static void EditChapter(string chapterId, string chapterTitle)
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{
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if (string.IsNullOrWhiteSpace(chapterId))
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throw new Exception("chapterId 不能为空");
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if (string.IsNullOrWhiteSpace(chapterTitle))
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throw new Exception("章节名称不能为空");
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if (GetInt("SELECT COUNT(*) FROM dbo.Sys_PdfChapter WHERE ChapterId='" + SqlEsc(chapterId) + "'") == 0)
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throw new Exception("章节不存在：" + chapterId);
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SQLHelper.ExecutSql("UPDATE dbo.Sys_PdfChapter SET ChapterTitle=N'" + SqlEsc(chapterTitle.Trim())
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+ "' WHERE ChapterId='" + SqlEsc(chapterId) + "'");
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}
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/// <summary>
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/// 删除章节及其全部子章节（递归收集自身+后代后一次性删除）。
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/// </summary>
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public static int DeleteChapter(string chapterId)
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{
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if (string.IsNullOrWhiteSpace(chapterId))
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throw new Exception("chapterId 不能为空");
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DataTable dt = SQLHelper.GetDataTableRunText(
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"SELECT BookId FROM dbo.Sys_PdfChapter WHERE ChapterId=@ChapterId",
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new[] { new SqlParameter("@ChapterId", chapterId) });
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if (dt == null || dt.Rows.Count == 0)
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throw new Exception("章节不存在：" + chapterId);
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string bookId = dt.Rows[0]["BookId"].ToString();
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var all = PdfBookService.GetChapters(bookId);
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var ids = new List<string> { chapterId };
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bool changed = true;
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while (changed)
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{
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changed = false;
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foreach (PdfChapter c in all)
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{
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if (!ids.Contains(c.ChapterId) && ids.Contains(c.ParentChapterId ?? ""))
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{
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ids.Add(c.ChapterId);
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changed = true;
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}
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}
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}
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var sb = new StringBuilder();
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foreach (string id in ids)
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{
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if (sb.Length > 0)
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sb.Append(",");
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sb.Append("'").Append(id.Replace("'", "''")).Append("'");
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}
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SQLHelper.ExecutSql("DELETE FROM dbo.Sys_PdfChapter WHERE ChapterId IN (" + sb + ")");
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return ids.Count;
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}
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/// <summary>
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/// 保存章节正文（富文本 HTML，与页面"保存内容"一致）。
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/// </summary>
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public static void SaveContent(string chapterId, string content)
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{
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if (string.IsNullOrWhiteSpace(chapterId))
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throw new Exception("chapterId 不能为空");
|
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if (GetInt("SELECT COUNT(*) FROM dbo.Sys_PdfChapter WHERE ChapterId='" + SqlEsc(chapterId) + "'") == 0)
|
||
throw new Exception("章节不存在：" + chapterId);
|
||
|
||
SQLHelper.ExecutSql("UPDATE dbo.Sys_PdfChapter SET [Text]=N'" + SqlEsc(content ?? "")
|
||
+ "' WHERE ChapterId='" + SqlEsc(chapterId) + "'");
|
||
}
|
||
#endregion
|
||
|
||
#region 工具
|
||
/// <summary>SQL 字符串转义。</summary>
|
||
private static string SqlEsc(string s)
|
||
{
|
||
return (s ?? "").Replace("'", "''");
|
||
}
|
||
|
||
/// <summary>执行 SELECT 首行首列并转 int（查无返回0）。</summary>
|
||
private static int GetInt(string sql)
|
||
{
|
||
DataTable dt = SQLHelper.GetDataTableRunText(sql, new SqlParameter[] { });
|
||
if (dt == null || dt.Rows.Count == 0)
|
||
return 0;
|
||
object v = dt.Rows[0][0];
|
||
return v == DBNull.Value || v == null ? 0 : Convert.ToInt32(v);
|
||
}
|
||
|
||
/// <summary>生成业务主键（前缀+时间+随机，与页面一致）。</summary>
|
||
private static string NewId(string prefix)
|
||
{
|
||
return prefix + DateTime.Now.ToString("yyyyMMddHHmmss")
|
||
+ Guid.NewGuid().ToString("N").Substring(0, 4);
|
||
}
|
||
#endregion
|
||
}
|
||
}
|