Question

这是我在dapper博客中找到的

var sql = 
@"
select * from Customers where CustomerId = @id
select * from Orders where CustomerId = @id
select * from Returns where CustomerId = @id";

using (var multi = connection.QueryMultiple(sql, new {id=selectedId}))
{
   var customer = multi.Read<Customer>().Single();      
   var returns = multi.Read<Return>().ToList();
   var orders = multi.Read<Order>().ToList();
   ...
}

我的要求是我想直接阅读“订单”。我能这样做吗？

Answer 1

如果你不想要其他两个，你可以在不迭代该序列的情况下调用Read：没有实现任何对象：

var customer = multi.Read<Customer>(); // not consumed
var returns = multi.Read<Return>(); // not consumed
var orders = multi.Read<Order>().ToList();

Answer 2

您可以使用查询扩展名来读取单个内容，例如

const string sql = "select * from Orders where CustomerId = @id";
var orders = connection.Query<Order>(sql, new {id = 1}).ToList();

编辑：

执行存储过程：

var orders = connection.Query<Order>("GetOrders", new {id = 1}, commandType: CommandType.StoredProcedure).ToList();

Dapper：直接从GridReader中读取第n个项目

2 个答案: