使用Entity Framework获取存储过程输出参数会引发映射错误:数据读取器与指定的不兼容

时间:2017-07-25 19:20:14

标签: c# entity-framework stored-procedures entity-framework-6 entity-framework-5

我正在处理遗留应用程序,我正在尝试调用一个返回整数但存在映射错误的存储过程。错误本身就是这个:

  

数据阅读器与指定的IF_Insert_Incidents_Citizen'不兼容。类型为“intID”的成员在数据读取器中没有相应的列具有相同的名称。

我尝试将名称更改为_intId,因为他知道Entity Framework会将所有以@variable开头的名称转换为_variable

奇怪的是,如果我使用LinqPad并调用存储过程,我会得到正确的值@intID

enter image description here

enter image description here

这是存储过程:

CREATE PROCEDURE [dbo].[IF_Insert_Incidents_Citizen]
    @chvFolio varchar(50),
    @chvOwner_Name varchar(100),
    @chvOwner_Address varchar(100),
    @dtsDate_Created smalldatetime, 
    @intUser_ID integer, 
    @chvDescription varchar(250), 
    @chvEmail varchar(50), 
    @intIncident_Type_ID integer, 
    @intIncident_Status integer, 
    @intID int Output
AS
    SET nocount on

    DECLARE @intErrorCode INT
    DECLARE @intApp_ID INT

    SELECT @intIncident_Type_ID = CAST(Param_Value AS INT)
    FROM IF_Parameters
    WHERE Param_Name = 'Citizen_Incident_Type_ID'

    BEGIN
        --Get an application id
        INSERT INTO MasterApplication (DateCreated) 
        VALUES (getdate())

        SELECT @intApp_ID = SCOPE_IDENTITY()

        INSERT INTO IF_Incidents
        (
            Folio, 
            Owner_Name,
            Owner_Address,
            Date_Created, 
            User_ID, 
            Description, 
            Incident_Type_ID, 
            Incident_Status,
            App_ID
        )
        VALUES 
        (
            @chvFolio, 
            @chvOwner_Name,
            @chvOwner_Address,
            @dtsDate_Created, 
            @intUser_ID, 
            @chvDescription ,
            @intIncident_Type_ID, 
            @intIncident_Status,
            @intApp_ID 
        )
        Select @intErrorCode = @@Error, @intID = SCOPE_IDENTITY()

        --Insert Complaint
        INSERT INTO IF_Complaints
        (
            Incident_ID, 
            Complainant_ID, 
            Description ,  
            User_ID, 
            Officer_Assigned_ID, 
            Complaint_Status_ID, 
            Date_Made,
            Email_Complainant
        )
        VALUES 
        (
            @intID, 
            Null, 
            @chvDescription + ' at ' + @chvOwner_Address, 
            1, 
            1, 
            1, 
            @dtsDate_Created ,
            @chvEmail
        )
        Select @intErrorCode = @@Error--, @intID = SCOPE_IDENTITY()
    End

    Return @intErrorCode

正如您在存储过程中看到的那样,intId在插入后总是得到一个增量值,调用SCOPE_IDENTITY()

现在我尝试使用Entity Framework以下列方式调用我的存储过程:

var bptRep = DependencyFactory.GetDependency<ICetRepository<IF_Insert_Incidents_Citizen>>();
var parameters = GetIfInsertIncidentsCitizenParamenters();
var res = bptRep.GetAllFromStoredProcedure(storedProcedure, parameters);

存储库使用此类

//class with just the return value
public class IF_Insert_Incidents_Citizen
{
    public int? intID { get; set; }
}

这里我获取了存储过程的所有参数

 private IEnumerable<SqlParameter> GetIfInsertIncidentsCitizenParamenters()
 {
        // Create Parameters
        var parameters = new List<SqlParameter>();

        var param1 = CreateSqlParameter("@chvFolio", SqlDbType.NVarChar, ParameterDirection.Input, criteria["chvFolio"].Value, 50); 

        parameters.Add(param1);

          ....

        var paramX = CreateSqlParameter("@intIncident_Status", SqlDbType.Int, ParameterDirection.Input, 10);
        parameters.Add(paramX);

        var outparam = CreateSqlParameter("@intID", SqlDbType.Int, ParameterDirection.InputOutput, DBNull.Value);
        parameters.Add(outparam);
}

public IQueryable<TEntity>GetAllFromStoredProcedure(string storedProcedure, IEnumerable<SqlParameter> parameters)
{
    var result = Context.Database.SqlQuery<TEntity>(storedProcedure, parameters).AsQueryable();    
    return result;
}

我按照@GertArnold建议的方法但仍然无效,这是我的参数和代码

enter image description here

var returnCode = new SqlParameter("@ReturnCode", SqlDbType.Int);
returnCode.Direction = ParameterDirection.Output;

var sql = "exec IF_Insert_Incidents_Citizen @chvFolio, @chvOwner_Name, @chvOwner_Address, @dtsDate_Created, @intUser_ID, @chvDescription, @chvEmail, @intIncident_Type_ID, @intIncident_Status, @intID OUT";

var data = ctx.Database.SqlQuery<object>(sql, returnCode, parameters);

var result = data.FirstOrDefault();

1 个答案:

答案 0 :(得分:2)

最后@GertArnold让我朝着正确的方向前进,如果你还没看过这篇文章,请这样做,会为你节省很多时间Stored procedures with output parameters using SqlQuery in the DbContext API

我刚刚在exec调用中添加了@intId OUT,没有必要创建一个ReturnCode变量并调用exec @ReturnCode = ....

var returnCode = new SqlParameter("@ReturnCode", SqlDbType.Int);
returnCode.Direction = ParameterDirection.Output;

我的代码最终看起来像这样,请注意在参数上调用.ToArray方法,而不是将IEnumerableIList的集合传递给方法

var sql = "exec IF_Insert_Incidents_Citizen @chvFolio, @chvOwner_Name, @chvOwner_Address, @dtsDate_Created, @intUser_ID, @chvDescription, @chvEmail, @intIncident_Type_ID, @intIncident_Status, @intID OUT";

var data = ctx.Database.SqlQuery<object>(sql, returnCode, parameters.ToArray());

var result = data.FirstOrDefault();