Re: [fpc-pascal] Database migration
On Mon, 22 Jun 2020, Jean SUZINEAU wrote: Le 21/06/2020 à 09:55, Michael Van Canneyt a écrit : I use the functionality in the database desktop actively. The generated code even runs in Delphi. If you look at it and find ways to improve it, I'm all ears :-) I got a quick look at it (Lazarus 2.0.6, FPC 3.0.4). I saw there is a distinct generator for each case: fpcsrc/3.0.4/packages/fcl-db/src/codegen/fpcgdbcoll.pp fpcsrc/3.0.4/packages/fcl-db/src/codegen/fpcgcreatedbf.pp fpcsrc/3.0.4/packages/fcl-db/src/codegen/fpcgtiopf.pp In my case, there is a single generator which is based on StringReplace with key/values stored in a StringList. I've seen other code generators that use a similar approach as yours: use templates. I considered but discarded that approach early on because there is too much logic involved; I would end up with too many templates. Michael.___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Database migration
Le 21/06/2020 à 09:55, Michael Van Canneyt a écrit : I use the functionality in the database desktop actively. The generated code even runs in Delphi. If you look at it and find ways to improve it, I'm all ears :-) I got a quick look at it (Lazarus 2.0.6, FPC 3.0.4). I saw there is a distinct generator for each case: fpcsrc/3.0.4/packages/fcl-db/src/codegen/fpcgdbcoll.pp fpcsrc/3.0.4/packages/fcl-db/src/codegen/fpcgcreatedbf.pp fpcsrc/3.0.4/packages/fcl-db/src/codegen/fpcgtiopf.pp In my case, there is a single generator which is based on StringReplace with key/values stored in a StringList. My first versions back to 2004 where coded as a plug-in for ModelMaker (UML modeling tool) . A few years later, I transformed it in a StarUML plug-in, and finally as a standalone freepascal program. At the beginning the composition of lists of fields or lists of tables was hard coded for example to make a list of labels for each field of table on a form's dfm: ( https://github.com/jsuzineau/pascal_o_r_mapping/blob/TjsDataContexte/pascal_o_r_mapping/03_Data/Automatic/Code_Generation/JoinPoint/02_Pascal/ujpPascal_LabelsDFM.pas ) the key value in the template is : Cle:= ' object lNomChamp: TLabel'; and a part of the generated value could be: ... object lNPROJECT: TLabel Caption = 'nProject' Left = 16 Top = 26 Height = 13 end object lBEGINNING: TLabel Caption = 'Beginning' Left = 16 Top = 48 Height = 13 end object lEND: TLabel Caption = 'End' Left = 16 Top = 70 Height = 13 end ... In the case of the dfm, I cannot use a comment for the key value so I put a Tlabel named lNomChamp in the template dfm, and add a ' object lNomChamp: TLabel' at the end of the generated value to avoid breaking the dfm. I ended up with a huge number of different kinds of hard coded lists for each situation in Pascal , C# and PHP. A few years ago , while testing Google Angular 4, to avoid to have to modify the generator for each new kind of list, I added the possibility to define a list with 4 files: listname.01_key.* for definition of the key for list listname listname.02_begin.* for definition of the header of list listname listname.03_element.* for definition of the body of each element of list listname listname.04_separateur.* for definition of the separator between each element of list listname listname.05_end.* for definition of the footer of list listname For example in Angular: file Angular_TypeScript_RouterLinks.01_key.html contains "" file Angular_TypeScript_RouterLinks.02_begin.html is empty file Angular_TypeScript_RouterLinks.03_element.html contains " Classe.Nom_de_la_classes" file Angular_TypeScript_RouterLinks.04_separateur.html contains a newline file Angular_TypeScript_RouterLinks.05_end.html is empty. (you can find these files at https://github.com/jsuzineau/pascal_o_r_mapping/tree/TjsDataContexte/jsWorks/Generateur_de_code/01_Listes/Tables ) Theses files are used in unit https://github.com/jsuzineau/pascal_o_r_mapping/blob/TjsDataContexte/pascal_o_r_mapping/03_Data/Automatic/Code_Generation/JoinPoint/ujpFile.pas . I used the term "JoinPoint" with Aspect Oriented Programming in mind, though it's not strictly aspect oriented programming. ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Database migration
On Sun, 21 Jun 2020, Jean SUZINEAU wrote: Le 21/06/2020 à 00:30, Michael Van Canneyt a écrit : FPC contains this as well since many years, you can drop the components on a form, but they are exposed in the lazarus database desktop as well. Very interesting, I didn't know this existed. I will have look at it. In fact I developed my code around 2004 for Delphi 7 and migrated it to fpc/lazarus around 2013 to be able to run it on linux server. Unfortunately my code is progressively abandoned now. I use the functionality in the database desktop actively. The generated code even runs in Delphi. If you look at it and find ways to improve it, I'm all ears :-) Michael.___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Database migration
Le 21/06/2020 à 00:30, Michael Van Canneyt a écrit : FPC contains this as well since many years, you can drop the components on a form, but they are exposed in the lazarus database desktop as well. Very interesting, I didn't know this existed. I will have look at it. In fact I developed my code around 2004 for Delphi 7 and migrated it to fpc/lazarus around 2013 to be able to run it on linux server. Unfortunately my code is progressively abandoned now. -- Trader en karma J'adore me regarder penser... ;-) http://jean.suzineau.pagesperso-orange.fr/ : mes pages perso http://www.mars42.com : mes pages professionnelles, astronomie & informatique ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Database migration
On Sun, 21 Jun 2020, Jean SUZINEAU wrote:
Hello,
Le 19/06/2020 à 13:55, Darius Blaszyk via fpc-pascal a écrit :
Schema::create('flights', function (Blueprint $table) {
$table->id();
$table->string('name');
$table->string('airline');
$table->timestamps();
});
I have something that looks a bit like this, a kind of ORM (sorry, part of my identifiers are in
French, "champ" means "field")
... in the class declaration
//champs persistants
public
nUser: Integer;
nProject: Integer;
Beginning: TDateTime; cBeginning: TChamp;
End_ : TDateTime; cEnd : TChamp;
Description: String;
... in the implementation of the constructor :
Champs.ChampDefinitions.NomTable:= 'Work';
//champs persistants
Integer_from_ ( nUser , 'nUser' );
Integer_from_ ( nProject , 'nProject' );
cBeginning:= DateTime_from_( Beginning , 'Beginning' );
cBeginning.Definition.Format_DateTime:= '/mm/dd" "hh:nn';
cEnd:= DateTime_from_( End_ , 'End');
cEnd.Definition.Format_DateTime:= '/mm/dd" "hh:nn';
(this is extracted from class TblWork from
https://github.com/jsuzineau/pascal_o_r_mapping/blob/master/jsWorks/Elements/Work/ublWork.pas
)
This class is for a row of the table "Work", most of the time, the instance is
initialized by reading a row of dataset, but I've
started some code to read from some other source, like android database or JSON
data.
I've made a source code generator which can query the structure of a database,
and generate source codes from templates.
Particularly it can create the skeleton of unit ublWork.pas which contains
class TblWork
FPC contains this as well since many years, you can drop the components on a
form, but they
are exposed in the lazarus database desktop as well.
Michael.___
fpc-pascal maillist - fpc-pascal@lists.freepascal.org
https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Database migration
Hello,
Le 19/06/2020 à 13:55, Darius Blaszyk
via fpc-pascal a écrit :
Schema::create('flights', function (Blueprint $table) {
$table->id();
$table->string('name');
$table->string('airline');
$table->timestamps();
});
I have something that looks a bit like this, a kind of ORM
(sorry, part of my identifiers are in French, "champ" means
"field")
... in the class declaration
//champs persistants
public
nUser: Integer;
nProject: Integer;
Beginning: TDateTime; cBeginning: TChamp;
End_ : TDateTime; cEnd : TChamp;
Description: String;
... in the implementation of the constructor :
Champs.ChampDefinitions.NomTable:= 'Work';
//champs persistants
Integer_from_ ( nUser , 'nUser' );
Integer_from_ ( nProject , 'nProject' );
cBeginning:= DateTime_from_( Beginning , 'Beginning' );
cBeginning.Definition.Format_DateTime:= '/mm/dd" "hh:nn';
cEnd:= DateTime_from_( End_ , 'End');
cEnd.Definition.Format_DateTime:= '/mm/dd" "hh:nn';
(this is extracted from class TblWork from https://github.com/jsuzineau/pascal_o_r_mapping/blob/master/jsWorks/Elements/Work/ublWork.pas
)
This class is for a row of the table "Work", most of the time,
the instance is initialized by reading a row of dataset, but I've
started some code to read from some other source, like android
database or JSON data.
I've made a source code generator which can query the structure
of a database, and generate source codes from templates.
Particularly it can create the skeleton of unit ublWork.pas which
contains class TblWork
My last release of source code generator is at : https://github.com/jsuzineau/pascal_o_r_mapping/releases/tag/2019_03_30_Generateur_de_code
All the source is released under LGPL at
https://github.com/jsuzineau/pascal_o_r_mapping/ , feel free to
pick up code from it if you need.
--
Trader en karma
J'adore me regarder penser... ;-)
http://jean.suzineau.pagesperso-orange.fr/ : mes pages perso
http://www.mars42.com : mes pages professionnelles, astronomie & informatique
___
fpc-pascal maillist - fpc-pascal@lists.freepascal.org
https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Database migration
> But before I proceed I would like to check here if something like this already exists None that I know of for native Pascal. As I no longer use ORM, Sqitch does the job for me these days. Basically it's like a git for database schema (surely you can do CRUD as well there, but it's mainly for schema). I have an experience of building such a tool myself, not a good days. I'd rather use what others have already made and proven to be working well. -- Sent from: http://free-pascal-general.1045716.n5.nabble.com/ ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
