Dapper

Question

我正在尝试执行 return 一个 return 值的存储过程。

但我收到错误消息：

2021-06-23 14:02:37.844 +02:00 [ERR] The member of type <>f__AnonymousType0`3[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] cannot be used as a parameter value

List<Person2> persons = new List<Person2>()
            {
                new Person2() { Id = 22, FirstName = "Calvin", LastName = "Kattar" },
                new Person2() { Id = 23, FirstName = "Edson", LastName = "Barboza" }
            };
            
            using (IDbConnection connection = new OracleConnection(GetConnectionString()))
            {
                try
                {
                    var personProjections = persons.Select(x => new  { id = x.Id, first_name = x.FirstName, last_name = x.LastName, out_message = x.OutMessage});

                    var results = connection.Query<Person2>("kwc_test_person_procedure2",
                    new { personProjections },
                    commandType: CommandType.StoredProcedure
                    );                   
                }
                catch (Exception ex)
                {
                    Log.Error(ex.Message);
                    Log.Error(ex.StackTrace);
                    throw;
                }
            }

我的类型是：

public class Person
    {
        public int Id { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }
    }

public class Person2 : Person 
    {
        public string OutMessage { get; set; }
    }

和存储过程：

create or replace procedure kwc_test_person_procedure2(
id in number,
first_name in varchar2,
last_name in varchar2,
out_message out varchar2
) is

begin
  insert into kwc_test_person(id, first_name, last_name) values (id, upper(first_name), upper(last_name));
  out_message := 'The person-ID ' || id || ' has been inserted to database on ' || sysdate;

End kwc_test_person_procedure2;

我做错了什么？

提前致谢！

Answer 1

Query(...) 的参数 param 类型错误。它必须是一个平面对象，它具有一个属性或您正在调用的过程的每个参数的字段。像这样的东西会起作用：

connection.Query("kwc_test_person_procedure2",
new { id = 1, first_name = "...", ...},
commandType: CommandType.StoredProcedure

由于您想为多人实例调用该过程，因此您的代码应如下所示：

 foreach(var personProjection in persons.Select(x => new  { id = x.Id, first_name = x.FirstName, last_name = x.LastName, out_message = x.OutMessage})
 {
                connection.Query("kwc_test_person_procedure2",
                personProjection,
                commandType: CommandType.StoredProcedure);     
 }

至于过程的 return 值，我不确定它在 Oracle 中是否是这样工作的；在 MSSQL 中，return 值将是过程中最后一个 select 的结果。看起来它在 oracle 中可能是相同的，请参阅 this。

Dapper - <>f__AnonymousType类型的成员.....不能作为参数值

Dapper - The member of type <>f__AnonymousType.....cannot be used as a parameter value

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