[Lazarus] Recherches sur REST API

Bonjour,
je possède un serveur https://sandbox.iniw.fr sur lequel j'ai commencé à installer un programme appelé lzRestAPI.exe.

Sur ce programme permet (permettra) d'accéder une base de données mariadb "selzig" :
Pièce jointe 669851
Nom de la table : "co"
coID clé primaire auto-incrémenté - coOBJ clé unique varchar(50) - xxACT index (boolean)

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
program lzRestAPI;
 
{$mode objfpc}{$H+}
 
uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  fphttpapp,
  HTTPDefs,
  httproute,
  fpjson,
  jsonparser,
  mysql56conn,
  SQLDB,
  DB;
 
  procedure catchallEndPoint(aRequest: TRequest; aResponse: TResponse);
  begin
    with aResponse do
    begin
      Content := 'This endpoint is not available.';
      Code := 404;
      ContentType := 'text/plain';
      ContentLength := Length(Content);
      SendContent;
    end;
  end;
 
  procedure jsonResponse(var aResponse: TResponse; Data: string);
  begin
    with aResponse do
    begin
      Content := Data;
      Code := 200;
      ContentType := 'application/json';
      ContentLength := Length(Content);
      SendContent;
    end;
  end;
 
  procedure jsonResponse404(var aResponse: TResponse);
  begin
    with aResponse do
    begin
      Content := 'This endpoint is not available.';
      Code := 404;
      ContentType := 'text/plain';
      ContentLength := Length(Content);
      SendContent;
    end;
  end;
 
  procedure selectOneEndPoint(aRequest: TRequest; aResponse: TResponse);
  const
    cSQL: string =
      'SELECT  coOBJ, xxACT ' + 'FROM co WHERE coID=:coID LIMIT 1;';
  var
    jObject: TJSONObject;
    lzConn: TMySQL56Connection;
    lzTrans: TSQLTransaction;
    lzQuery: TSQLQuery;
  begin
    lzConn := TMySQL56Connection.Create(nil);
    lzQuery := TSQLQuery.Create(nil);
    try
      with lzConn do
      begin
        HostName := 'localhost';
        Port := 3306;              
        UserName :='xxxxxxxxx';
        Password := 'xxxxxxxxx';
        DatabaseName := 'selzig';
        Charset := 'utf8mb4';
      end;
      lzTrans := TSQLTransaction.Create(lzConn);
      lzConn.Transaction := lzTrans;
      lzQuery.Database := lzConn;
      lzQuery.Transaction := lzTrans;
      try
        lzConn.Open;
        with lzQuery do
        begin
          SQL.Text := cSQL;
          Prepare;
          Params.ParamByName('coID').AsString := aRequest.RouteParams['name'];
          Open;
          jObject := TJSONObject.Create;
          try
            if lzQuery.EOF then
              jsonResponse404(aResponse)
            else
            begin
              jObject.Strings['coID'] := aRequest.RouteParams['name'];
              jObject.Strings['coOBJ'] := FieldByName('coOBJ').AsString;
              jObject.Strings['xxACT'] := IntToStr(FieldByName('xxACT').AsInteger);
              jsonResponse(aResponse, jObject.AsJSON);
            end;
          finally
            jObject.Free;
          end;
          lzTrans.Commit;
          lzQuery.Close;
        end;
      except
        on e: ESQLDatabaseError do
        begin
          lzTrans.Rollback;
          jsonResponse404(aResponse);
        //  Writeln('Erreur de connexion ou de Rollback à la base : ' +E.Message);
        end;
      end;
    finally
      lzConn.Free;
      lzQuery.Free;
    end;
  end;
 
begin
  Application.Port := 9090;
  HttpRouter.RegisterRoute('/catchall', rmAll, @catchallEndPoint, True);
  HttpRouter.RegisterRoute('/selectone/:name', rmGet, @selectOneEndPoint);
  Application.Threaded := True;
  Application.Initialize;
  Writeln('Server is ready at localhost ' + IntToStr(Application.Port) + '.');
  Application.Run;
end.

Parallèlement sur mon poste de développement, j'ai créé l'application "lzSQLDB.exe".

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
unit wslave;
 
{$mode ObjFPC}{$H+}
 
interface
 
uses
  Classes, SysUtils, Forms, Controls, Graphics, Dialogs, StdCtrls,
  fphttpclient, fpjson, jsonparser, opensslsockets;
 
type
 
  { TForm1 }
 
  TForm1 = class(TForm)
    edHTTPS1: TEdit;
    edNUM1: TEdit;
    laHPPTS1: TLabel;
    Memo1: TMemo;
    procedure edNUM1Change(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
 
  public
 
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.lfm}
 
{ TForm1 }
 
procedure TForm1.FormCreate(Sender: TObject);
begin
  Memo1.Lines.Clear;
end;
 
procedure TForm1.edNUM1Change(Sender: TObject);
  var
    listitemsjson: string;
    J: TJSONData;
  begin
    if Pos('co',memo1.Lines[1])=1 then
       Memo1.Clear
    else
    with TFPHttpClient.Create(nil) do
    begin
      try
        try
        listitemsjson := Get(edHTTPS1.Text+edNUM1.Text);
        J := GetJSON(listitemsjson);
        with Memo1 do
        begin
          Clear;
          Lines.Add('coID: ' + J.FindPath('coID').AsString);
          Lines.Add('coOBJ: ' + J.FindPath('coOBJ').AsString);
          Lines.Add('xxACT: ' + J.FindPath('xxACT').AsString);
        end;
        except
           Memo1.Lines.Clear;
           showmessage('Erreur : Position de ligne interdite.');
        end;
      finally
        Free();
      end;
    end;
  end;
 
end.

Première question : Comment sur le serveur "me faire renvoyer" les 5 lignes, autrement dit, comment envoyer "SELECT coID, coOBJ, xxACT FROM co" ?
Deuxième question : Comment les faire apparaître dans lzSQLDB.exe ?

Merci d'avance. Cordialement. Selzig.