如何使用Entity Framework 6使用IN语句执行原始SQL

问题描述

我有一个包含一些ID的列表，我想选择ID在该列表中的记录.到目前为止，我有

I have a list that contains some ID's, and I'd want to pick the records whose ID is in that list. So far I have

var ids = new List<long> {1, 2, 3};  // Actually the list is not hard coded
using(var context = new MyContext())
{
   context.MyModel.Database.SqlQuery("SELECT * FROM dbo.MyModel WHERE Id IN @p0", ids).ToList();
}

但是这不起作用，它给了我 MySql.Data.MySqlClient.MySqlException

But this doesn't work, and it gives me an MySql.Data.MySqlClient.MySqlException

请不要给我一个LINQ解决方案.预先感谢.

Please don't give me a LINQ solution. Thanks in advance.

推荐答案

我认为您不能将数组传递给sql，这在SqlServer上有效，您可能需要将MySql更改为新的MySQLParameter

I don't think you can pass array to sql,this works on SqlServer You might need to change to new MySQLParameter for MySql

var inParams = ids.Select((id, i) => new SqlParameter("p"+i, id));

var query = "select * from Employees where Id in (" + string.Join(",", inParams.Select(p => "@" + p.ParameterName)) + ")";

var data = db.Database.SqlQuery<Employee>(query, inParams.Cast<object>().ToArray()).ToList();

此外，您还可以将LINQ用于更复杂的查询以及具有AS和JOIN和UNION的查询.

Also you can use LINQ for more complex queries as well ones that have AS and JOIN and UNION

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