项目 6 数据存储：仿冒 SqlClient（T-SQL 转写成 SQLite）、数据库页面、DataGridView、DateTimePicker
- 每个学生一套数据库，长期保存（data/databases/<用户编号>/库名.db）；学生程序运行时挂进沙箱可读写 - Sim.Data：SqlConnection / SqlCommand / SqlDataReader / SqlDataAdapter / SqlCommandBuilder / SqlParameter； 连接字符串只按库名打开学生自己的库；ScriptDom 解析 T-SQL 后按白名单转写成 SQLite 语句， STRICT 表 + 元数据表还原 SQL Server 的列类型，报错编号和中文信息与 SQL Server 一致； INSERT 不写列名时跳过自增列，日期统一格式（书上 DateTime.ToString() 拼接的日期能正确比较） - 常驻 SQL 服务（Sim.Runner sql-server）：数据库页面的查询、对象资源管理器，评分前按实验 database.sql 建库 - 数据库页面（代替 SSMS）：对象资源管理器、查询窗口、编辑前 200 行、表设计器、恢复实验初始数据 - DataGridView（绑定 DataView/DataTable/DataSet，单元格修改写回 DataTable）、DateTimePicker；设计器工具箱加入 - 评分：每个检查项一份新建的实验库；新增点 / 修改表格单元格、选日期、表格里有 / 没有某行的检查 - 示例：项目 6 任务 2、3；时间格式改成和中文 Windows 一致（9:05:03）；异常堆栈不暴露服务器路径 - 测试：数据库端到端、接口（每人只看到自己的库、恢复实验数据）、评分出错情况、T-SQL 生成 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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using System;
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using System.Collections.Generic;
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using System.Data.SqlClient;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Text.Encodings.Web;
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using System.Text.Json;
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using System.Text.Json.Nodes;
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using System.Text.RegularExpressions;
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using System.Threading;
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using System.Threading.Tasks;
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using Sim.Data.Engine;
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namespace Sim.Runner;
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/// <summary>
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/// 常驻 SQL 服务：数据库页面（代替 SSMS）的查询、对象资源管理器，以及评分前按实验预置脚本准备数据库。
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/// 请求里的目录由服务器给出（学生自己的数据库目录或评分用的临时目录），学生的 SQL 经转写后只能操作这个目录里的库。
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/// 每行一个请求 {"id":…,"type":"exec"|"script"|"explorer",…}，回复带同样的 id；请求可以并发处理。
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/// </summary>
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internal static class SqlService
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{
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private static readonly JsonSerializerOptions JsonOptions = new() { Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping };
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private static readonly TimeSpan TimeLimit = TimeSpan.FromSeconds(5);
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/// <summary>查询窗口最多显示的行数</summary>
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private const int MaxRows = 1000;
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public static int Run()
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{
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// 日期等按中文 Windows 上 SSMS 的样子显示
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CultureInfo.DefaultThreadCurrentCulture = CultureInfo.GetCultureInfo("zh-CN");
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using var input = new StreamReader(Console.OpenStandardInput(), new UTF8Encoding(false));
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var output = new StreamWriter(Console.OpenStandardOutput(), new UTF8Encoding(false)) { AutoFlush = true };
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var writeLock = new object();
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using var slots = new SemaphoreSlim(4);
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output.WriteLine(new JsonObject { ["type"] = "ready" }.ToJsonString(JsonOptions));
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while (input.ReadLine() is { } line)
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{
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slots.Wait();
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Task.Run(() =>
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{
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JsonObject reply;
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JsonNode? id = null;
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try
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{
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var request = JsonNode.Parse(line)!.AsObject();
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id = request["id"]?.DeepClone();
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reply = Handle(request);
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}
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catch (SqlException ex)
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{
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reply = Error(ex);
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}
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catch (Exception ex)
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{
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reply = new JsonObject { ["type"] = "error", ["number"] = 0, ["message"] = ex.Message, ["line"] = 1 };
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}
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finally
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{
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slots.Release();
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}
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reply["id"] = id;
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lock (writeLock) output.WriteLine(reply.ToJsonString(JsonOptions));
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});
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}
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return 0;
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}
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private static JsonObject Handle(JsonObject request)
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{
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var dir = (string?)request["dir"] ?? throw new ArgumentException("缺少 dir");
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var store = new DatabaseStore(dir);
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return (string?)request["type"] switch
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{
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"exec" => Exec(store, (string?)request["database"] ?? DatabaseStore.Master, (string?)request["sql"] ?? ""),
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"script" => Script(store, (string?)request["sql"] ?? ""),
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"explorer" => Explorer(store),
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var type => throw new ArgumentException($"不认识的请求 {type}"),
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};
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}
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/// <summary>查询窗口执行一批语句：返回各个结果集（最多 1000 行）、受影响的行数，以及执行后的当前库（USE 可能切换了）</summary>
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private static JsonObject Exec(DatabaseStore store, string database, string sql)
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{
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var started = Environment.TickCount64;
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using var session = new Session(store, database, TimeLimit);
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var batch = session.Execute(sql, name => (false, null));
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var results = new JsonArray();
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foreach (var result in batch.Results)
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{
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var columns = new JsonArray();
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foreach (var column in result.Columns) columns.Add(new JsonObject { ["name"] = column.Name, ["type"] = column.Type?.ToString() });
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var rows = new JsonArray();
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foreach (var row in result.Rows.Take(MaxRows))
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{
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var cells = new JsonArray();
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for (var i = 0; i < row.Length; i++) cells.Add(Display(row[i], result.Columns[i].Type?.IsDate == true));
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rows.Add(cells);
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}
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results.Add(new JsonObject { ["columns"] = columns, ["rows"] = rows, ["total"] = result.Rows.Count });
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}
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return new JsonObject
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{
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["type"] = "result",
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["database"] = session.Database,
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["results"] = results,
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["affected"] = batch.RecordsAffected,
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["ms"] = Environment.TickCount64 - started,
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};
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}
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/// <summary>执行一个脚本（多批语句，用单独一行的 GO 分隔），从 master 开始，USE 对后面的批次有效</summary>
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private static JsonObject Script(DatabaseStore store, string sql)
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{
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var batches = Regex.Split(sql, @"^\s*GO\s*$", RegexOptions.Multiline | RegexOptions.IgnoreCase).Where(b => !string.IsNullOrWhiteSpace(b));
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using var session = new Session(store, DatabaseStore.Master, TimeSpan.FromSeconds(30));
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foreach (var batch in batches) session.Execute(batch, name => (false, null));
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return new JsonObject { ["type"] = "done" };
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}
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/// <summary>对象资源管理器：所有库、库里的表、表的列</summary>
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private static JsonObject Explorer(DatabaseStore store)
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{
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var databases = new JsonArray();
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foreach (var name in store.List())
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{
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var tables = new JsonArray();
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using (var connection = store.Open(name))
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{
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foreach (var table in DatabaseStore.ListTables(connection))
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{
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var info = DatabaseStore.GetTable(connection, table);
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var columns = new JsonArray();
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foreach (var column in info?.Columns ?? Array.Empty<ColumnInfo>())
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{
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columns.Add(new JsonObject
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{
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["name"] = column.Name,
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["type"] = column.Type.ToString(),
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["nullable"] = column.Nullable,
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["identity"] = column.Identity,
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["primaryKey"] = column.PrimaryKey,
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});
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}
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tables.Add(new JsonObject { ["name"] = table, ["columns"] = columns });
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}
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}
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databases.Add(new JsonObject { ["name"] = name, ["tables"] = tables });
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}
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return new JsonObject { ["type"] = "explorer", ["databases"] = databases };
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}
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/// <summary>结果网格里显示的样子，和 SSMS 一致：日期 2024-01-16 09:05:03.000，bit 显示 1 / 0，二进制显示 0x…</summary>
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private static JsonNode? Display(object value, bool dateOnly) => value switch
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{
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DBNull => null,
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DateTime d when dateOnly => d.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture),
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DateTime d => d.ToString("yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture),
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bool b => b ? 1 : 0,
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byte[] bytes => "0x" + Convert.ToHexString(bytes.AsSpan(0, Math.Min(bytes.Length, 32))) + (bytes.Length > 32 ? "…" : ""),
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int i => i,
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long l => l,
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double x => x,
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decimal m => m,
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IFormattable f => f.ToString(null, CultureInfo.InvariantCulture),
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_ => value.ToString(),
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};
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private static JsonObject Error(SqlException ex) =>
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new() { ["type"] = "error", ["number"] = ex.Number, ["message"] = ex.Message, ["line"] = ex.LineNumber };
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}
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