Dapper - Result Anonymous
Description
Extension methods can be used to execute a query and map the result using dynamic.
The anonymous result can be mapped from following extension methods:
These extension methods can be called from any object of type IDbConnection.
Example - Query
Query method can execute a query and map the result to a dynamic list.
string sql = "SELECT TOP 10 * FROM OrderDetails";
using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
{
var orderDetails = connection.QueryFirstOrDefault(sql);
FiddleHelper.WriteTable(orderDetails);
}
Example - QueryFirst
QueryFirst method can execute a query and map the first result to a dynamic list.
string sql = "SELECT * FROM OrderDetails WHERE OrderDetailID = @OrderDetailID;";
using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
{
var orderDetail = connection.QueryFirst(sql, new {OrderDetailID = 1});
FiddleHelper.WriteTable(orderDetail);
}
Example - QueryFirstOrDefault
QueryFirstOrDefault method can execute a query and map the first result to a dynamic list, or a default value if the sequence contains no elements.
string sql = "SELECT * FROM OrderDetails WHERE OrderDetailID = @OrderDetailID;";
using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
{
var orderDetail = connection.QueryFirstOrDefault(sql, new {OrderDetailID = 1});
FiddleHelper.WriteTable(orderDetail);
}
Example - QuerySingle
QuerySingle method can execute a query and map the first result to a dynamic list, and throws an exception if there is not exactly one element in the sequence.
string sql = "SELECT * FROM OrderDetails WHERE OrderDetailID = @OrderDetailID;";
using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
{
var orderDetail = connection.QuerySingle(sql, new {OrderDetailID = 1});
FiddleHelper.WriteTable(orderDetail);
}
Example - QuerySingleOrDefault
QuerySingleOrDefault method can execute a query and map the first result to a dynamic list, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.
string sql = "SELECT * FROM OrderDetails WHERE OrderDetailID = @OrderDetailID;";
using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
{
var orderDetail = connection.QuerySingleOrDefault(sql, new {OrderDetailID = 1});
FiddleHelper.WriteTable(orderDetail);
}