Add ormliteVar filter

Author: mythz

src/ServiceStack.OrmLite/TemplateDbFilters.cs

@@ -82,6 +82,8 @@ public int dbExec(TemplateScopeContext scope, string sql, Dictionary<string, obj
         public string sqlLimit(int? limit) => padCondition(OrmLiteConfig.DialectProvider.SqlLimit(null, limit));
         public string sqlSkip(int? offset) => padCondition(OrmLiteConfig.DialectProvider.SqlLimit(offset, null));
         public string sqlTake(int? limit) => padCondition(OrmLiteConfig.DialectProvider.SqlLimit(null, limit));
+        public string ormliteVar(string name) => OrmLiteConfig.DialectProvider.Variables.TryGetValue(name, out var value) ? value : null;
+
         private string padCondition(string text) => string.IsNullOrEmpty(text) ? "" : " " + text;
     }
 }

src/ServiceStack.OrmLite/TemplateDbFiltersAsync.cs

@@ -84,6 +84,8 @@ public Task<object> dbExec(TemplateScopeContext scope, string sql, Dictionary<st
         public string sqlLimit(int? limit) => padCondition(OrmLiteConfig.DialectProvider.SqlLimit(null, limit));
         public string sqlSkip(int? offset) => padCondition(OrmLiteConfig.DialectProvider.SqlLimit(offset, null));
         public string sqlTake(int? limit) => padCondition(OrmLiteConfig.DialectProvider.SqlLimit(null, limit));
+        public string ormliteVar(string name) => OrmLiteConfig.DialectProvider.Variables.TryGetValue(name, out var value) ? value : null;
+
         private string padCondition(string text) => string.IsNullOrEmpty(text) ? "" : " " + text;
     }
 }