題
var sql = @"SELECT
a.id AS `Id`,
a.thing AS `Name`,
b.id AS `CategoryId`,
b.something AS `CategoryName`
FROM ..";
var products = connection.Query<Product, Category, Product>(sql,
(product, category) =>
{
product.Category = category;
return product;
},
splitOn: "CategoryId");
foreach(var p in products)
{
System.Diagnostics.Debug.WriteLine("{0} (#{1}) in {2} (#{3})", p.Name, p.Id, p.Category.Name, p.Category.Id);
}
結果是：
'First (#1) in (#0)'
'Second (#2) in (#0)'
CategoryId和CategoryName具有以下值
var products = connection.Query(sql).Select<dynamic, Product>(x => new Product
{
Id = x.Id,
Name = x.Name,
Category = new Category { Id = x.CategoryId, Name = x.CategoryName }
});
結果是：
'First (#1) in My Category (#10)'
'Second (#2) in My Category (#10)'
我正在連接MySQL數據庫，如果它與它有任何關係。
一般承認的答案
最簡單的方法是將它們全部稱為Id （不區分大小寫，所以只需a.id和b.id就可以了）;然後你可以使用：
public void TestMultiMapWithSplit()
{
var sql = @"select 1 as Id, 'abc' as Name, 2 as Id, 'def' as Name";
var product = connection.Query<Product, Category, Product>(sql,
(prod, cat) =>
{
prod.Category = cat;
return prod;
}).First();
// assertions
product.Id.IsEqualTo(1);
product.Name.IsEqualTo("abc");
product.Category.Id.IsEqualTo(2);
product.Category.Name.IsEqualTo("def");
}
如果您不能這樣做，則有一個可選的splitOn （ string ）參數，該參數採用以逗號分隔的列列表來處理拆分。