dapper

I would like to understand on when would some one really need to think of using Dapper. Also i would like to understand the Pros and Cons of comparing Dapper Vs ADO.NET Dapper is just a tool. What it does is: make it trivially easy to correctly parameterize queries make it trivially easy to execute queries (scalar, multi-rows, multi-grids, and no-results) make it trivially easy to turn results into objects very efficiently and quickly What it doesn't do is: generate a class model for you generate queries for you track objects and their changes so you can just call SubmitChanges() (or whatever)

I'm trying to get started with Dapper in an exisiting MVC3 project and although it looks very easy to use, I can't seem to find any tutorials on how to set it up intially. Any links or suggestions would be highly appreciated. Thanks a lot. Marc Gravell That is, in part, because there is nothing to set up - all you need is a database (which it doesn't care about) and some classes (which it doesn't care about). The core methods just take parameterised SQL, and are deliberately close to LINQ-to-SQL's sql-based methods (hint: we use dapper as a direct drop-in replacement whenever we get issues

Using Dapper-dot-net... The following yields no results in the data object: var data = conn.Query(@" select top 25 Term as Label, Type, ID from SearchTerms WHERE Term like '%@T%'", new { T = (string)term }); However, when I just use a regular String Format like: string QueryString = String.Format("select top 25 Term as Label, Type, ID from SearchTerms WHERE Term like '%{0}%'", term); var data = conn.Query(QueryString); I get 25 rows back in the collection. Is Dapper not correctly parsing the end of the parameter @T ? Sam Saffron Try: term = "whateverterm"; var encodeForLike = term => term

I'm using Dapper to map my entities to SQL Server CE. If I save a DateTime with Kind=Utc , when I read it back I get a DateTime with Kind=Unspecified , which leads to all kind of problems. Example: var f = new Foo { Id = 42, ModificationDate = DateTime.UtcNow }; Console.WriteLine("{0} ({1})", f.ModificationDate, f.ModificationDate.Kind); connection.Execute("insert into Foo(Id, ModificationDate) values(@Id, @ModificationDate)", f); var f2 = connection.Query<Foo>("select * from Foo where Id = @Id", f).Single(); Console.WriteLine("{0} ({1})", f2.ModificationDate, f2.ModificationDate.Kind); This

I am trying Dapper ORM and I am querying a a Posts table. But I would like to get paged results ... 1 - How can I do this? Isn't there a helper for this? 2 - Can Dapper Query return an IQueryable? Thank You, Miguel 1) Dapper doesn't have a built-in pagination feature. But its not too hard to implement it directly in the query. Example: SELECT * FROM ( SELECT ROW_NUMBER() OVER ( ORDER BY InsertDate) AS RowNum, * FROM Posts WHERE InsertDate >= '1900-01-01' ) AS result WHERE RowNum >= 1 // *your pagination parameters AND RowNum < 20 //* ORDER BY RowNum Requires SQL Server 2005+ 2) Dapper returns

使用dapper不需要考虑conn是否连接，在执行dapper时自行判断 open状态，如果没有打开它会自己打开。 来源： https://blog.csdn.net/LLLiuwanpeng/article/details/100878268

I have a base repository with a Generic Get method to return Data using Dapper like public T Get<T>(Func<IDbConnection, T> query) { using (IDbConnection db = new SqlConnection(ConfigurationManager.ConnectionStrings["myDB"].ConnectionString)) { return query.Invoke(db); } } However I now have the need to return multiple Data. The DAL query is as below: var multi = db.QueryMultiple(getCarDataSp , new { CustomerID = customerId, Year = year }, commandType: CommandType.StoredProcedure)); var cars = multi.Read<CarDTO>(); var options = multi.Read<CarOptionDTO>(); //wire the options to the cars foreach