Entity Framework Core - Using Stored Procedure with output parameters

问题

I'm trying to use stored procedures with new Entity Framework Core. I need to start new project soon which will be ASP.Net 5, but not sure if Entity Framework will fit for the job. The application will be triggering several stored procedures per minute and I need output parameters. Will EF be good for this or should I use ADO.Net?

I have tried FromSql and database.ExecuteSqlCommand but no luck.

using (AppDbContext db = factory.Create())
        {
            var in1 = new SqlParameter
            {
                ParameterName = "ParamIn1",
                DbType = System.Data.DbType.Int64,
                Direction = System.Data.ParameterDirection.Input
            };
            var in2 = new SqlParameter
            {
                ParameterName = "ParamIn2",
                DbType = System.Data.DbType.String,
                Direction = System.Data.ParameterDirection.Input
            };
            var out1 = new SqlParameter
            {
                ParameterName = "ParamOut1",
                DbType = System.Data.DbType.Int64,
                Direction = System.Data.ParameterDirection.Output
            };
            var out2 = new SqlParameter
            {
                ParameterName = "ParamOut2",
                DbType = System.Data.DbType.String,
                Direction = System.Data.ParameterDirection.Output
            };

            var result = db.Database.ExecuteSqlCommand("exec spTestSp", in1, in2, out1, out2);
        }

回答1:

It should work, but I believe you also need to include the parameter names and the OUT keyword in the command statement

var sql = "exec spTestSp @ParamIn1, @ParamIn2, @ParamOut1 OUT, @ParamOut2 OUT";
var result = db.Database.ExecuteSqlCommand(sql, in1, in2, out1, out2);

var out1Value = (long) out1.Value;
var out2Value = (string) out2.Value;

回答2:

The StoredProcedureEFCore extention supports output parameters

Then the usage is like this

List<Model> rows = null;

ctx.LoadStoredProc("dbo.ListAll")
   .AddParam("limit", 300L)
   .AddParam("limitOut", out IOutParam<long> limitOut)
   .Exec(r => rows = r.ToList<Model>());

long limitOutValue = limitOut.Value;

ctx.LoadStoredProc("dbo.ReturnBoolean")
   .AddParam("boolean_to_return", true)
   .ReturnValue(out IOutParam<bool> retParam)
   .ExecNonQuery();

bool b = retParam.Value;

ctx.LoadStoredProc("dbo.ListAll")
   .AddParam("limit", 1L)
   .ExecScalar(out long l);

来源：https://stackoverflow.com/questions/45252959/entity-framework-core-using-stored-procedure-with-output-parameters

标签

ASP.NET

entity-framework

entity-framework-core