在.net实体框架核心中执行sql语句

Question

我创建了 ASP.NET 5.0 Core-Web-API 项目并使用 package Microsoft.EntityFrameworkCore版本 5.0.13。 如果我运行简单的 sql 语句var simple = myDbContext.myTable.FromSqlInterpolated($"Select Id, colA, colB From Testvw")一切都按预期工作。 如果我执行存储在文本文件中的相同查询，我会遇到错误：

 string path = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
 string sqlFile = Path.Combine(path, @"SQL_Ressourcen\myQuery.txt");
 String sql = System.IO.File.ReadAllText(sqlFile);
 var simple = myDbContext.myTable.FromSqlInterpolated($"{sql}");

System.InvalidOperationException
  HResult=0x80131509
  Nachricht = 'FromSqlRaw' or 'FromSqlInterpolated' was called with non-composable SQL and with a query composing over it. Consider calling 'AsEnumerable' after the method to perform the composition on the client side.
  Quelle = Microsoft.EntityFrameworkCore.Relational

从文件加载查询字符串时如何执行查询？

Answer 1

我认为您可以执行以下操作：

var blogs = context.myTable
.FromSqlRaw($"Select Id, colA, colB From myTable")
.ToList();
// or AsEnumerable();
var blogs = context.myTable
.FromSqlRaw($"Select Id, colA, colB From myTable")
.AsEnumerable();

来源：原始 SQL 查询

否则，您可以尝试添加如下内容：

var simple = _context.myTable.FromSqlInterpolated($"Select Id, colA, colB From myTable").ToList();

问候。