fix(mssql): improve GetSchemaTable metadata to prevent ConstraintException in DataTable.Load

Author: vkuttyp

Directory.Build.props

@@ -7,6 +7,6 @@
     <Authors>vkuttyp</Authors>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <RepositoryUrl>https://github.com/vkuttyp/CosmoSQLClient-Dotnet</RepositoryUrl>
-    <Version>1.5.5</Version>
+    <Version>1.5.6</Version>
   </PropertyGroup>
 </Project>

src/CosmoSQLClient.MsSql/MsSqlDataReader.cs

@@ -111,17 +111,30 @@ public override DataTable GetSchemaTable()
         dt.Columns.Add("NumericScale",     typeof(short));
         dt.Columns.Add("DataType",         typeof(Type));
         dt.Columns.Add("AllowDBNull",      typeof(bool));
+        dt.Columns.Add("IsKey",            typeof(bool));
+        dt.Columns.Add("IsUnique",         typeof(bool));
+        dt.Columns.Add("IsAutoIncrement",  typeof(bool));
+        dt.Columns.Add("BaseTableName",    typeof(string));
+        dt.Columns.Add("BaseColumnName",   typeof(string));
 
         var cols = CurrentSetColumns;
         if (cols != null)
         {
             for (int i = 0; i < cols.Count; i++)
             {
                 var row = dt.NewRow();
-                row["ColumnName"]    = cols[i].Name;
-                row["ColumnOrdinal"] = i;
-                row["DataType"]      = GetFieldType(i);
-                row["AllowDBNull"]   = cols[i].IsNullable;
+                row["ColumnName"]      = cols[i].Name;
+                row["ColumnOrdinal"]   = i;
+                row["ColumnSize"]      = -1; // Unknown
+                row["NumericPrecision"] = (short)0;
+                row["NumericScale"]    = (short)0;
+                row["DataType"]        = GetFieldType(i);
+                row["AllowDBNull"]     = cols[i].IsNullable;
+                row["IsKey"]           = false;
+                row["IsUnique"]        = false;
+                row["IsAutoIncrement"] = false;
+                row["BaseTableName"]   = string.Empty;
+                row["BaseColumnName"]  = cols[i].Name;
                 dt.Rows.Add(row);
             }
         }