firebird

In a firebird database with a table "Sales", I need to select the first sale of all customers. See below a sample that show the table and desired result of query. --------------------------------------- SALES --------------------------------------- ID CUSTOMERID DTHRSALE 1 25 01/04/16 09:32 2 30 02/04/16 11:22 3 25 05/04/16 08:10 4 31 07/03/16 10:22 5 22 01/02/16 12:30 6 22 10/01/16 08:45 Result: only first sale, based on sale date. ID CUSTOMERID DTHRSALE 1 25 01/04/16 09:32 2 30 02/04/16 11:22 4 31 07/03/16 10:22 6 22 10/01/16 08:45 I've already tested following code " Select first row in

My Delphi (XE 10) program uses nonunicode (single byte) legacy Firebird database (character set NONE) and therefore its data (that are read from or saved into database) depends on the windows Locale for the nonunicode programs. Depending on this Windows setting the same database character can be displayed in the program as \u0101 (that is correct) or \u0432 (that is not correct). IBX serves as DB access technology. My program works only for the specificed local for nonunicode programs and that is acceptable for the client. The question is - how can I make program to feel the specific

I'm working on c# windows service that handles firebird database requests. My problem occurs at random moments (sometimes after 5 minutes, sometimes after just 4 calls to database), when I try to deserialize object on client application. It happens though only at specific position (stops at 18th byte in 54 byte array). Rest of the time the function returns a proper result. I'm using this function to serialize single object public byte[] ObjectToByteArray(Object obj) { if (obj == null) return null; MemoryStream fs = new MemoryStream(); BinaryFormatter formatter = new BinaryFormatter();

I'm using an embedded Firebird database with code first (Entity Framework 6). The first time the application runs, it works fine: the database gets created and the data gets inserted. But every time it runs after that, it throws the following exception: An exception of type 'System.NotSupportedException' occurred in FirebirdSql.Data.FirebirdClient.dll but was not handled in user code Additional information: Unknown data type The project includes the following NuGet packages: EntityFramework [6.0.2] Firebird ADO.NET Data provider (Entity Framework 6) [4.1.0.0] I added the DbProviderFactories

I've created a view in my database which I would like to include in my entity model. However, when I try to update the entity model through VS 2008, a warning message informs me that the TABLE OR VIEW I'm trying to add doesn't have a primary key. It seems that in order to add a view to the model, this must have a key field! How can I add this view to my model if views are not permitted to have key field, at least in firebird which is the DBMRS I’m using. Any idea of how to solve this? Greg Jackman There's a great answer to that here: Entity Framework and SQL Server View (see accepted answer:

I could not find solution for my problem. I have two tables Order and OrderDetail. Order table (simple version) | ID | modified | | 1 | 7.1.2018. | | 2 | 10.1.2018.| | 3 | 15.1.2018.| | 4 | 20.1.2018.| | 5 | 25.1.2018.| OrderDetails (simple version) | order_id | detail_id | base_price | buy_price | sell_price| | 1 | 1 | 99.00 | 111.00 | 122.00 | | 1 | 2 | 82.00 | 95.00 | 117.00 | | 1 | 3 | 82.00 | 95.00 | 117.00 | | 2 | 4 | 95.00 | 108.00 | 119.00 | | 2 | 5 | 86.00 | 94.00 | 115.00 | | 2 | 1 | 82.00 | 95.00 | 117.00 | | 3 | 1 | 92.00 | 106.00 | 116.00 | | 3 | 4 | 90.00 | 100.00 | 120.00 | | 3

The question I asked yesterday was simplified but I realize that I have to report the whole story. I have to extract the data of 4 from 4 different tables into a Firebird 2.5 database and the following query works: SELECT PRODUZIONE_T t.CODPRODUZIONE, PRODUZIONE_T.NUMEROCOMMESSA as numeroco, ANGCLIENTIFORNITORI.RAGIONESOCIALE1, PRODUZIONE_T.DATACONSEGNA, PRODUZIONE_T.REVISIONE, ANGUTENTI.NOMINATIVO, ORDINI.T_DATA, FROM PRODUZIONE_T LEFT OUTER JOIN ORDINI_T ON PRODUZIONE_T.CODORDINE=ORDINI_T.CODORDINE INNER JOIN ANGCLIENTIFORNITORI ON ANGCLIENTIFORNITORI.CODCLIFOR=ORDINI_T.CODCLIFOR LEFT OUTER