RTL.JSONBuilder
Description
This code snippet shows how to write JSON content using the framework System.JSON.Builders.
Code
The following JSON object contains information about purchase records from a website.
{"Transaction":[
{"id":662713, "firstName":"John", "lastName":"Doe", "price": 2.1, "parent_id": null, validated:true},
{"id":662714, "firstName":"Anna", "lastName":"Smith", "price": 4.5, "parent_id": null, validated: false},
{"id":662715, "firstName":"Peter", "lastName":"Jones", "price": 3.6, "parent_id": null, validated: true}
]}
This sample illustrates how to write the JSON object provided using System.JSON.Builders. The JSON object created is printed to the console.
uses
System.SysUtils,
System.Classes,
System.JSON.Types,
System.JSON.Writers,
System.JSON.Builders;
var
Builder: TJSONObjectBuilder;
Writer: TJsonTextWriter;
StringWriter: TStringWriter;
StringBuilder: TStringBuilder;
begin
StringBuilder := TStringBuilder.Create;
StringWriter := TStringWriter.Create(StringBuilder);
Writer := TJsonTextWriter.Create(StringWriter);
Writer.Formatting := TJsonFormatting.Indented;
Builder := TJSONObjectBuilder.Create(Writer);
Builder
.BeginObject
.BeginArray('Transaction')
.BeginObject.Add('id', 662713)
.Add('firstName', 'John')
.Add('lastName', 'Doe')
.Add('price', 2.1)
.AddNull('parent_id')
.Add('validated', true)
.EndObject
.BeginObject
.Add('id', 662714)
.Add('firstName', 'Anna')
.Add('lastName', 'Smith')
.Add('price', 4.5)
.AddNull('parent_id')
.Add('validated', false)
.EndObject
.BeginObject
.Add('id', 662715)
.Add('firstName', 'Peter')
.Add('lastName', 'Jones')
.Add('price', 3.6)
.AddNull('parent_id')
.Add('validated', true)
.EndObject
.EndArray
.EndObject;
WriteLn(StringBuilder.ToString);
This is the JSON content from the console:
{
"Transaction": [
{
"id": 662713,
"firstName": "John",
"lastName": "Doe",
"price": 2.1,
"parent_id": null,
"validated": true
},
{
"id": 662714,
"firstName": "Anna",
"lastName": "Smith",
"price": 4.5,
"parent_id": null,
"validated": false
},
{
"id": 662715,
"firstName": "Peter",
"lastName": "Jones",
"price": 3.6,
"parent_id": null,
"validated": true
}
]
}