数据库：参数化的日期字符串比较时也转换格式

- 教材项目 8 用参数传 "2024/1/23  23:59:59"（日期和时间之间两个空格）做 BETWEEN，
  比较时用 tsql_cmp 把形如日期的字符串转成标准格式；日期和时间之间允许多个空格

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

runtime/Sim.Data/Engine/Functions.cs

@@ -44,6 +44,7 @@ internal static class Functions
         c.CreateFunction<object?, object?>("tsql_ceiling", x => x is null ? null : Math.Ceiling(ToDouble(x)), isDeterministic: true);
         c.CreateFunction<object?, object?, object?>("tsql_power", (x, y) => x is null || y is null ? null : Math.Pow(ToDouble(x), ToDouble(y)), isDeterministic: true);
         c.CreateFunction<object?, object?>("tsql_sqrt", x => x is null ? null : Math.Sqrt(ToDouble(x)), isDeterministic: true);
+        c.CreateFunction<object?, object?>("tsql_cmp", v => v is string s && Values.LooksLikeDate(s) ? Values.NormalizeDateLiteral(s) : v, isDeterministic: true);
         c.CreateFunction("tsql_newid", () => Guid.NewGuid().ToString().ToUpperInvariant());
         c.CreateFunction("tsql_rand", () => Random.Shared.NextDouble());
     }

runtime/Sim.Data/Engine/Translator.cs

@@ -911,6 +911,14 @@ internal sealed class Translator
             _sql.Append(Values.Quote(Values.NormalizeDateLiteral(s.Value)));
             return;
         }
+        // 参数的值执行时才知道：是日期样子的字符串时同样转成标准格式（教材 BETWEEN @time_start AND @time_end 传的是字符串）
+        if (expression is VariableReference)
+        {
+            _sql.Append("tsql_cmp(");
+            Expression(expression);
+            _sql.Append(')');
+            return;
+        }
         Expression(expression);
     }
 }

runtime/Sim.Data/Engine/Values.cs

@@ -17,13 +17,16 @@ internal static class Values
     };
 
     /// <summary>形如日期的字符串字面量（比较时转成标准格式，例如 BETWEEN '2024/1/16 9:05:03' AND ...）</summary>
-    private static readonly Regex DateLike = new(@"^\d{4}[-/.]\d{1,2}[-/.]\d{1,2}([ T]\d{1,2}:\d{1,2}(:\d{1,2}(\.\d+)?)?)?$");
+    private static readonly Regex DateLike = new(@"^\d{4}[-/.]\d{1,2}[-/.]\d{1,2}((\s+|T)\d{1,2}:\d{1,2}(:\d{1,2}(\.\d+)?)?)?$");
+
+    /// <summary>日期和时间之间多余的空格（教材拼出的 "2024/1/23  23:59:59"）</summary>
+    private static readonly Regex Spaces = new(@"\s+");
 
     public static bool LooksLikeDate(string text) => DateLike.IsMatch(text.Trim());
 
     /// <summary>按 SQL Server 接受的写法解析日期（包括中文 Windows 上 DateTime.ToString() 的 2024/1/16 9:05:03）</summary>
     public static bool TryParseDateTime(string text, out DateTime value) =>
-        DateTime.TryParseExact(text.Trim(), DateFormats, CultureInfo.InvariantCulture, DateTimeStyles.AllowWhiteSpaces, out value);
+        DateTime.TryParseExact(Spaces.Replace(text.Trim(), " "), DateFormats, CultureInfo.InvariantCulture, DateTimeStyles.AllowWhiteSpaces, out value);
 
     public static string FormatDateTime(DateTime value) =>
         value.Millisecond == 0 && value.Ticks % TimeSpan.TicksPerMillisecond == 0