TOPIC:

Hi All,does anyone have experience with postgres and dapper?Juraj

Hi Juraj,
for PG ask Johan Nel, i think he uses it from the beginning... IIRC, Wolfgang R. also has it in production for some time.
As for dapper, AFAIK, nobody has spoken here about it, sorry.

Hi Juraj,
as Karl said: I'm using it in production, from VO (through a self written COM wrapper), X# and PHP (we have some larger projects on it).
But for Dapper: I had to google it to understand what it is.
I prefer to have less possible dependences in my code, and I have written my own (thin) libraries that expose the same functionality for PG, MS SQL, MySQL, SQLite and Oracle.
Wolfgang

Hi Wolfgang,Thank you for your response. I need to start a project quickly with Postgresql database in local network (3-4 clients), so it would be very helpful for me to use some validated existing libraries to save time. I will be grateful for any help.Juraj

Jurai,
you are aware of npgsql.org ? This should let you work with pg from x# like any DBMS via <a class="bbcode_url" href="http://ado.net" target="_blank" rel="nofollow noopener noreferrer">ado.net</a>.
@all: sorry for strange appeareance, can't hinder forum software from interfering with my text

Hi Juraj,
please give me a bit of time, and then I will publish my class library.
Basically I'm having a class called PGConnection with methods like :GetDataTable( cSelect ) and :ExecuteStatement( cStmt ) that does all the work. And there are helper classes to build insert and update statements.
All these classes I have are working the same manner for all the different SQL engines I need to use (the most used are MS SQL, PostgreSQL, SQLite and Oracle).
The beauty of .NET is that you don't need any configuration on the client machines, and therefore I have build COM libraries for my VO applications that do exactly that.
Wolfgang

Hi Juraj,
this is my code to get a .NET DataTable from a PostgreSQL database:

method GetDataTable( cSelect as string ) as DataTable
    local oAdapter            as NpgsqlDataAdapter
    local oDataSet            as DataSet
    local oDataTable        as DataTable

    oDataTable          := null_object

    try

    oAdapter            := NpgsqlDataAdapter{ cSelect, self:Connection }
    oDataSet            := Dataset{}
    oAdapter:Fill( oDataSet )
    oDataTable          := oDataSet:Tables[0]
    oDataSet            := null_object

    catch oEx as Exception

    _cLastError            := oEx:Message
    rdm.BaseLib.ErrorSys.InvokeExceptionHandler( oEx, cSelect )
    rdm.BaseLib.ErrorSys.ProcessException( oEx )

    end try

    return oDataTable

Wolfgang
 

We are using this. You can use the free Npgsql. But we used the paid Devart dotConnect for PostgreSQL.

It is more powerful and feature loaded. Key features that we use syncing data that Npgsql does not have.

But some of our apps is using Npgsql.

Hi there,
we use Postgres and XS2ADO and thus the normal data server

Hello Frank,

I want to know more.

My initial email on this to Robert, he told me XS2Ado is just a X# ported from VO2Ado.

It is not ADO.NET. So, my question, how do you connect to PostgreSQL?
1. It is via OLEDB/ODBC driver something that comes with Windows?
2. Or something else.

Thanks anyway for the info,

--

Rene

Hello Rene,
my old VO Code use XS2ADO with the ODBC Driver:

InitConnection := MyAdoConnection{}       
InitConnection:ConnectionTimeout := 5
InitConnection:CommandTimeout:=720
InitConnection:CursorLocation := adUseClient
InitConnection:ConnectionString:="Provider=MSDASQL.1;DRIVER=PostgreSQL Unicode;DATABASE=postgres;SERVER="+Server+";PORT="+port+";UID="+user+";PWD="+pw+";B9=0"
InitConnection:Open(nil,nil,nil,nil)  
oServer := MyAdoserver{"Select * from Table", InitConnection,adOpenKeyset,adlockoptimistic,nil}

And for new Code i use Npgsql Functions. 

Frank