Database

<pre>queryString += _
" UNION ALL " & _
" SELECT  " & _
"  h.FINVNO " & _
", h.FCUSTNO " & _
", h.FCOMPANY " & _
", h.FSALESPN " & _
", h.FSHIPVIA " & _
", h.FORDDATE " & _
", h.FSHIPDATE " & _
", h.FNTAXAMT " & _
", (SELECT a.FADDR1 FROM ARCUS01.dbf a WHERE h.FCUSTNO = a.FCUSTNO) AS FADDR1 " & _
", (SELECT j.FPRINT FROM ARCEMJN.dbf j WHERE h.FINVNO = j.FINVNO) AS FPRINT " & _
", (SELECT j.FSENT FROM ARCEMJN.dbf j WHERE h.FINVNO = j.FINVNO) AS FSENT " & _
", (SELECT p.FBATCH FROM ARPRINT.dbf p WHERE h.FINVNO = p.FINVNO) AS FBATCH " & _
", (SELECT ce.FID, ce.FCUSTNO, ce.FCHECK, ce.FNAME, ce.FEMAIL FROM ARCEM02.dbf ce WHERE FCUSTNO = h.FCUSTNO) AS CONTACTS " & _
" FROM ARINV01H.dbf h " & _
" WHERE h.FSHIPDATE = @startDate "

pResults.Add(New model_invoice_index() With {
     .FINVNO = If(reader.IsDBNull(0), String.Empty, reader.GetString(0)),
     .FCUSTNO = If(reader.IsDBNull(1), String.Empty, reader.GetString(1)),
     .FCOMPANY = If(reader.IsDBNull(2), String.Empty, reader.GetString(2)),
     .FSALESPN = If(reader.IsDBNull(3), String.Empty, reader.GetString(3)),
     .FSHIPVIA = If(reader.IsDBNull(4), String.Empty, reader.GetString(4)),
     .FORDDATE = If(reader.IsDBNull(5), New DateTime(89, 1, 1), reader.GetValue(5)),
     .FSHIPDATE = If(reader.IsDBNull(6), New DateTime(89, 1, 1), reader.GetValue(6)),
     .FNTAXAMT = If(reader.IsDBNull(7), 0.0, reader.GetValue(7)),
     .FADDR1 = If(reader.IsDBNull(8), String.Empty, reader.GetString(8)),
     .FPRINT = If(reader.IsDBNull(9), False, reader.GetValue(9)),
     .FSENT = If(reader.IsDBNull(10), False, reader.GetValue(10)),
     .FBATCH = If(reader.IsDBNull(11), False, reader.GetValue(11)),
     .FCONTACTS = New List(Of model_invoice_contacts()) With {
        dsdaasd
     }
}

DROP PROCEDURE IF EXISTS tgc.UpdateCustomerBalance;
CREATE PROCEDURE tgc.`UpdateCustomerBalance`(customerId varchar(50), cost Decimal(8,2))
BEGIN
UPDATE Customers SET Balance = Balance - cost WHERE CustomerId = customerId;
END;

try
            {
                using (var context = new Db_Entities())
                {
                object[] parameters =
                {
                    new MySql.Data.MySqlClient.MySqlParameter("@customerId", customerId),
                    new MySql.Data.MySqlClient.MySqlParameter("@cost", cost)
                };
                  
                await context.Database.ExecuteSqlCommandAsync("UpdateCustomerBalance @customerId,@cost", parameters);
                }
            }
            catch (Exception e)
            {
                throw;
            }

"Message": "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UpdateCustomerBalance 'xyz',0.03' at line 1",

await context.Database.ExecuteSqlCommandAsync("UPDATE Customers SET Balance = Balance - " + cost + " WHERE CustomerId = '" + customerId + "'");