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.Drawing;
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using System.Globalization;
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using System.Text.Json.Nodes;
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using Sim.Host;
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namespace System.Windows.Forms;
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public enum DateTimePickerFormat { Long = 1, Short = 2, Time = 4, Custom = 8 }
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/// <summary>日期时间选择器（教材项目 6 任务 3 选查询的起止日期）。Text 按 Format 显示，和中文 Windows 一致（Long：2024年1月16日）</summary>
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public class DateTimePicker : Control
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{
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public static readonly DateTime MinimumDateTime = new(1753, 1, 1);
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public static readonly DateTime MaximumDateTime = new(9998, 12, 31);
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private DateTime _value = DateTime.Now;
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private DateTimePickerFormat _format = DateTimePickerFormat.Long;
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private string? _customFormat;
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private bool _showUpDown;
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private DateTime _minDate = MinimumDateTime;
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private DateTime _maxDate = MaximumDateTime;
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protected override Size DefaultSize => new(200, 21);
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public DateTime Value
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{
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get => _value;
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set
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{
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if (value < _minDate || value > _maxDate)
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throw new ArgumentOutOfRangeException(nameof(value), $"“{value}”的值对于“Value”无效。“Value”应介于“MinDate”和“MaxDate”之间。");
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if (value == _value) return;
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LegacyThreads.CheckPoint();
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_value = value;
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NotifyValue();
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OnValueChanged(EventArgs.Empty);
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}
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}
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public DateTimePickerFormat Format
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{
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get => _format;
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set
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{
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_format = value;
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NotifyValue();
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NotifyChanged(nameof(Format), value);
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}
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}
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public string? CustomFormat
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{
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get => _customFormat;
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set
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{
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_customFormat = value;
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NotifyValue();
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}
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}
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public bool ShowUpDown
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{
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get => _showUpDown;
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set => SetProp(ref _showUpDown, value, nameof(ShowUpDown));
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}
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public DateTime MinDate
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{
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get => _minDate;
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set => _minDate = value;
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}
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public DateTime MaxDate
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{
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get => _maxDate;
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set => _maxDate = value;
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}
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public bool ShowCheckBox { get; set; }
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public bool Checked { get; set; } = true;
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public LeftRightAlignment DropDownAlign { get; set; }
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/// <summary>显示的文字；赋值时按日期解析</summary>
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public override string Text
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{
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get => Display;
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set
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{
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if (string.IsNullOrEmpty(value)) return;
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Value = DateTime.Parse(value, CultureInfo.CurrentCulture);
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}
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}
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private string Display => _format switch
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{
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DateTimePickerFormat.Short => _value.ToString("d", CultureInfo.CurrentCulture),
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DateTimePickerFormat.Time => _value.ToString("T", CultureInfo.CurrentCulture),
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DateTimePickerFormat.Custom when !string.IsNullOrEmpty(_customFormat) => _value.ToString(_customFormat, CultureInfo.CurrentCulture),
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_ => _value.ToString("D", CultureInfo.CurrentCulture),
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};
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public event EventHandler? ValueChanged;
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public event EventHandler? CloseUp;
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public event EventHandler? DropDown;
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protected virtual void OnValueChanged(EventArgs e) => ValueChanged?.Invoke(this, e);
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/// <summary>浏览器里选了新的日期或时间（ISO 格式，本地时间）：和 WinForms 一样先 ValueChanged，再 CloseUp</summary>
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protected override void OnUserAction(UserAction action)
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{
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switch (action.Action)
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{
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case "dropDown":
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DropDown?.Invoke(this, EventArgs.Empty);
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break;
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case "pick" when DateTime.TryParse(action.Value, CultureInfo.InvariantCulture, DateTimeStyles.None, out var picked):
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var clamped = picked < _minDate ? _minDate : picked > _maxDate ? _maxDate : picked;
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if (clamped != _value) Value = clamped;
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else NotifyValue();
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CloseUp?.Invoke(this, EventArgs.Empty);
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break;
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default:
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base.OnUserAction(action);
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break;
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}
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}
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private void NotifyValue()
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{
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NotifyChanged("Text", Display);
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NotifyChanged("Value", _value.ToString("yyyy-MM-ddTHH:mm:ss", CultureInfo.InvariantCulture));
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}
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protected override void WriteProps(JsonObject props)
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{
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base.WriteProps(props);
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props["Value"] = _value.ToString("yyyy-MM-ddTHH:mm:ss", CultureInfo.InvariantCulture);
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props["Format"] = _format.ToString();
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props["ShowUpDown"] = _showUpDown;
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props["HasTime"] = _format == DateTimePickerFormat.Time || (_format == DateTimePickerFormat.Custom && (_customFormat ?? "").IndexOfAny(['H', 'h', 'm', 's']) >= 0);
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props["HasDate"] = _format != DateTimePickerFormat.Time && !(_format == DateTimePickerFormat.Custom && (_customFormat ?? "").IndexOfAny(['y', 'M', 'd']) < 0);
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}
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}
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@@ -98,3 +98,4 @@ public interface IButtonControl
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void NotifyDefault(bool value);
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void PerformClick();
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}
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public enum LeftRightAlignment { Left, Right }
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@@ -13,6 +13,8 @@ public static class PropValue
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public static JsonNode? From(object? value) => value switch
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{
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null => null,
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// 控件自己组织好的结构（如 DataGridView 的列和行）原样发送
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JsonNode node => node.Parent == null ? node : node.DeepClone(),
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string s => JsonValueOf(s),
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bool b => JsonValueOf(b),
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char c => JsonValueOf(c == '\0' ? "" : c.ToString()),
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@@ -13,6 +13,9 @@ public sealed class UserAction
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public string Button { get; init; } = "left";
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public int X { get; init; }
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public int Y { get; init; }
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/// <summary>DataGridView 的单元格：行号、列号（-1 表示行标题）</summary>
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public int Row { get; init; } = -1;
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public int Column { get; init; } = -1;
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public static UserAction FromJson(JsonObject json) => new()
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{
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@@ -22,5 +25,7 @@ public sealed class UserAction
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Button = (string?)json["button"] ?? "left",
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X = (int?)json["x"] ?? 0,
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Y = (int?)json["y"] ?? 0,
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Row = (int?)json["row"] ?? -1,
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Column = (int?)json["column"] ?? -1,
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};
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}
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