Dapper存储过程以及多次查询和批量写入操作

一、存储过程操作

1. 准备存储过程 newsreturnvalue(该存储过程计算2个参数的和并返回)

USE [ZPC.Contact]

GO

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

create proc [dbo].[newsreturnvalue]
(

  @param1 int,
  @param2 int
)

as

begin
   return @param1+@param2;
end

2. 调用方式：

private static void ExecuteWithParam()
{
      using (IDbConnection conn = GetConnection())
      {
             DynamicParameters p = new DynamicParameters();
             p.Add("@param1", );
             p.Add("@param2",);
             p.Add("@ReturnValue", null, DbType.Int32, ParameterDirection.ReturnValue);

             conn.Execute("newsreturnvalue", p, null, null, CommandType.StoredProcedure);

             int result= p.Get<int>("@ReturnValue");

             Console.WriteLine(result);
     }
}

二、QueryMultiple 批量查询介绍

private static void GetNewsAndCat()
{
      using (IDbConnection conn = GetConnection())
      {
           string sql = @"
                        select * from news n inner join newscat nc on n.columncatid=nc.id where n.id=@id;
                        select * from newscat where id=@id
                        ";

           using (var mulsql = conn.QueryMultiple(sql, new { id =  })) {
                 var news = mulsql.Read<News>().SingleOrDefault();
                 var newscat = mulsql.Read<NewsCat>().SingleOrDefault();
           }
      }
 }

三、批量写入操作

 private static int InsertNewsBatch()
 {
      using(IDbConnection conn = GetConnection())
      {
            int result= conn.Execute("insert into NewsCat(Name,modifiedon,parentid) values(@name,@modifiedon,@parentid)", new []{
                    new {name="cat1",modifiedon=DateTime.Now, parentid= },
                    new {name="cat2",modifiedon=DateTime.Now, parentid= },
                    new {name="cat3",modifiedon=DateTime.Now, parentid= }
            }, null, null, null);

            return result;
      }
}

补充一下Dapper还支持List集合如：

private static void GetByIds()
{
      IList<int> idslist = new List<int> {,,};
      using (IDbConnection conn = GetConnection())
      {
            var list= conn.Query<NewsCat>("select * from Newscat where id in @ids", new { ids = idslist });
            foreach(var item in list)
            {
                   Console.WriteLine(item.Name);
            }
      }
}