Asp.net core 学习笔记 2.2 migration to 3.0

Ef core 3.0 一些要注意的改变

refer : https://docs.microsoft.com/en-us/ef/core/what-is-new/ef-core-3.0/breaking-changes#dc

1. 要另外安装 nuget

Microsoft.EntityFrameworkCore.SqlServer

2. 另外装 tools

dotnet tool install --global dotnet-ef

nuget : Microsoft.EntityFrameworkCore.Design

3. FromSql, ExecuteSql, and ExecuteSqlAsync 换名字和调用了

context.Products.FromSqlRaw(
    "SELECT * FROM Products WHERE Name = {0}",
    product.Name);

注意 parameter 写在后面

另外一种写法是

context.Products.FromSqlInterpolated(
    $"SELECT * FROM Products WHERE Name = {product.Name}");

调用的方法和方式换掉了. 但出来的结果是一样的哦.

4. FromSql 不可以在写 store procedure, 

这句不合格

context.Products.FromSqlRaw("[dbo].[Ten Most Expensive Products]").FirstOrDefault();

改成这句

context.Products.FromSqlRaw("[dbo].[Ten Most Expensive Products]").AsEnumerable().FirstOrDefault();