sqlserver支持sql_variant类型

XCode/DataAccessLayer/DAL.cs

@@ -611,7 +611,7 @@ public partial class DAL
 
     private IList<IDataTable> GetTables()
     {
-        if (Db is DbBase db2 && !db2.SupportSchema) return new List<IDataTable>();
+        if (Db is DbBase db2 && !db2.SupportSchema) return [];
 
         var tracer = Tracer ?? GlobalTracer;
         using var span = tracer?.NewSpan($"db:{ConnName}:GetTables", ConnName);
@@ -634,7 +634,7 @@ public partial class DAL
     /// <summary>
     /// 获取所有表名，带缓存，不区分大小写
     /// </summary>
-    public ICollection<String> TableNames => _cache.GetOrAdd("tableNames", k => new HashSet<String>(GetTableNames(), StringComparer.OrdinalIgnoreCase), 60) ?? new HashSet<String>();
+    public ICollection<String> TableNames => _cache.GetOrAdd("tableNames", k => new HashSet<String>(GetTableNames(), StringComparer.OrdinalIgnoreCase), 60) ?? [];
 
     /// <summary>
     /// 快速获取所有表名，无缓存，区分大小写
@@ -735,7 +735,7 @@ public partial class DAL
         }
     }
 
-    internal List<String> HasCheckTables = new();
+    internal List<String> HasCheckTables = [];
     /// <summary>检查是否已存在，如果不存在则添加</summary>
     /// <param name="tableName"></param>
     /// <returns></returns>

XCode/DataAccessLayer/Database/SqlServer.cs

@@ -1690,7 +1690,7 @@ internal class SqlServerMetaData : RemoteDbMetaData
         { typeof(Double), new String[] { "float" } },
         { typeof(Decimal), new String[] { "money", "decimal({0}, {1})", "numeric({0}, {1})", "smallmoney" } },
         { typeof(DateTime), new String[] { "datetime", "smalldatetime", "datetime2({0})", "date" } },
-        { typeof(String), new String[] { "nvarchar({0})", "ntext", "text", "varchar({0})", "char({0})", "nchar({0})", "xml" } }
+        { typeof(String), new String[] { "nvarchar({0})", "ntext", "text", "varchar({0})", "char({0})", "nchar({0})", "xml", "sql_variant" } }
     };
 
     #region 辅助函数

XUnitTest.XCode/DataAccessLayer/SqlServerTests.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Data;
+using System.Data.Common;
 using System.IO;
 using System.Linq;
 using System.Threading;
@@ -479,4 +481,45 @@ public class SqlServerTests
             """;
         Assert.Equal(targetSql, sql);
     }
+
+    [Fact]
+    public void GetTables()
+    {
+        DAL.AddConnStr("sysSqlServer", _ConnStr, null, "SqlServer");
+        var dal = DAL.Create("sysSqlServer");
+
+        var dbprovider = dal.DbType.ToString();
+        var builder = new DbConnectionStringBuilder
+        {
+            ConnectionString = dal.ConnStr
+        };
+
+        var dt = dal.Db.CreateSession().GetSchema(null, "Databases", null);
+        var sysdbnames = new String[] { "master", "tempdb", "model", "msdb" };
+        foreach (DataRow dr in dt.Rows)
+        {
+            var dbname = dr[0].ToString();
+            if (Array.IndexOf(sysdbnames, dbname) >= 0) continue;
+
+            var connName = String.Format("{0}_{1}", "ms", dbname);
+
+            builder["Database"] = dbname;
+            var connstr = builder.ToString();
+            DAL.AddConnStr(connName, connstr, null, dbprovider);
+
+            try
+            {
+                var dal2 = DAL.Create(connName);
+                var tables = dal2.Tables;
+                XTrace.WriteLine("数据库{0}有表{1}张", dbname, tables.Count);
+
+                var xml = DAL.Export(tables);
+                File.WriteAllText($"data\\{connName}.xml".GetFullPath(), xml);
+            }
+            catch
+            {
+                if (DAL.ConnStrs.ContainsKey(connName)) DAL.ConnStrs.Remove(connName);
+            }
+        }
+    }
 }