c# - 如何将参数添加到实体框架原始 sql 命令

Question

如何将参数添加到以下实体框架原始 SQL 命令？例如，如果我想制作Ida 参数怎么办？

        using (var context = new NorthwindDBEntities())
        {
            context.Database.ExecuteSqlCommand(@"
                UPDATE dbo.Customers 
                SET Name = 'Test' WHERE Id = 1
            ");

        }

Answer 1

context.Database.ExecuteSqlCommand(@"UPDATE dbo.Customers 
            SET Name = 'Test' WHERE Id = @Id", new SqlParameter("Id", 1));

在多个参数的情况下

context.Database.ExecuteSqlCommand(@"UPDATE dbo.Customers 
            SET Name = 'Test' WHERE Id = @id and Name =@name", 
               new SqlParameter("Id", id),
               new SqlParameter("name", fname));

Answer 2

以下代码应该适用于这种情况：

    using (var context = new NorthwindDBEntities())
    {
        context.Database.ExecuteSqlCommand(@"
            UPDATE dbo.Customers 
            SET Name = 'Test' WHERE Id = {0}
        ", 1);
    }

您还可以使用SqlParameter和使用@id：

    using (var context = new NorthwindDBEntities())
    {
        context.Database.ExecuteSqlCommand(@"
            UPDATE dbo.Customers 
            SET Name = 'Test' WHERE Id = @id
        ", new SqlParameter("id", 1));
    }