Voir la source de Json fragment (tech)

__NOTOC__
Un fragment JSon est un élément d'un document JSon qui peut être manipulé comme une variable.

Exemple :

<source lang="delphi">
//Procedure TestJson;
var json:TJSon; va,v1,v2:variant;
begin
  json := TJson.Create(
  '{"a":[{"e1":1,"e2":2,"e3":{"e31":"v31","e32":["e321","e322"]}}]}'
  );
  va := json.a[0];
  v1 := json.a[0].e1; 
  v2 := va.e1;
  if v1<>v2 
   then showMessage('failed')
   else showMessage('Ok'); 
end;
</source>

===Type de données===

{|class="wikitable"
|-
!Type de donnée
!Usage
|-
|variant
|Tout fragment
|-
|TjsonStruct
|Structure
|-
|TjsonArray
|Tableau
|}

===Opération sur un fragment===

{|class="wikitable"
|-
|op1
|op2
|ope
|rslt
|-
|j1={a:0}
|j2={b:0}
|j1.assign(j2)
|j1=={b:0}
|-
|j1={a:0}
|j2={b:0}
|j1.merge(j2)
|j1==[{a:0},{b:0}]
|-
|j1={s:{a:0}}
|j2={s:{b:0}}
|j1.s.assign(j2.s)
|j1=={s:{b:0}}
|-
|j1={s:{a:0}}
|j2={s:{b:0}}
|j1.s.merge(j2.s)
|j1=={s:{a:0,b:0}}
|-
|j1={a:0}
|j2={s:{b:0}}
|j1.assign(j2.s)
|j1=={b:0}
|-
|j1={a:0}
|j2={s:{b:0}}
|j1.merge(j2.s)
|j1=={a:0,b:0}
|}

'''AddStruct'''

<source lang="delphi">
var json1,json2:TJSon; vs,v1,v2:variant;
begin
  json1 := TJson.Create('{}');
  json1.AddStruct('b').c := 1;

  v1 := json1.b.c; 
  if v1=1 
   then showMessage('ok')
   else showMessage('failed'); 
end;
</source>

<source lang="delphi">
//Procedure TestJson1;
var json1,json2:TJson;
begin
  json1 := Tjson.Create('{}'); 
  json1.meta.id := 1;

  json2 := TJson.Create('{}');
  json2.bp.name := 'name';
  json2.bp.version := '1';
  json2.bp.addStruct('data','{...}');
  showMessage(json2.AsString);

  json1.meta.addStruct('bp',json2.bp);
  showMessage(json1.AsString);
  json1.CopyToClipboard;  
end;
</source>

'''Clear (tableau)'''

<source lang="delphi">
//Procedure TestJson4;
var json:TJSon; va,v1:variant;
begin
  json := TJson.Create('{}');
  json.b[0].a[0].Values := '1';
  va := json.b[0].a; 
  va.Clear(0);
   
  if va.count=0 
   then showMessage('ok')
   else showMessage('failed'); 
end;
</source>

'''Assign'''



<source lang="delphi">
//Procedure TestJSon8;
var json1,json2:TJSon; vb,v1:variant;
begin
  json1 := TJson.Create('{}');
  json1.a.b := 1;
  json1.a.AddStruct('b','{c:1}');

  vb := json1.a.b; 
  if not vb.Exists('c') then 
   begin 
     showMessage('failed'); 
     Exit;
   end; 

  v1 := vb.c; 
  if (v1<>1) then 
   begin 
     showMessage('failed'); 
     Exit;
   end; 

  // replace content of b 
  vb.Assign('{d:2}');

  if vb.Exists('c') then 
   begin 
     showMessage('failed'); 
     Exit;
   end; 

  if not vb.Exists('d') then 
   begin 
     showMessage('failed'); 
     Exit;
   end; 

  v1 := vb.d; 
  if (v1=2)
   then showMessage('ok')
   else showMessage('failed'); 
end;
</source>

'''Merge'''

<source lang="delphi">
//Procedure TestJson9;
var json1,json2:TJSon; vs,v1,v2:variant;
begin
  json1 := TJson.Create('{}');
  json1.a.b.x := 1;
  json1.a.b.Merge('{c:1}');

  v1 := json1.a.b.c; 
  if v1=1 
   then showMessage('ok')
   else showMessage('failed'); 
end;
</source>

<source lang="delphi">
//Procedure TestJson9;
var json1,json2:TJSon; vx,v1,v2:variant;
begin
  json1 := TJson.Create('{}');
  json1.a.b.c := 1;
  v1 := json1.a.b; 
  if not v1.Exists('c') then
   begin
     showMessage('failed (1)');
     Exit; 
   end; 

  json2 := TJson.Create('{}');
  json2.a.b.d := 1;
  v2 := json2.a.b;
  if not v2.Exists('d') then
   begin
     showMessage('failed (2)');
     Exit; 
   end; 

  v1.merge(v2); 

  if not v1.Exists('d') then
   begin
     showMessage('failed (3)');
     Exit; 
   end; 

  vx := json1.a.b.d; 
  if vx=1 
   then showMessage('ok')
   else showMessage('failed (2)'); 
end;
</source>



[[Category:Version910]] 
[[Category:Json]]