关于数据库父子关系的节点转为json的问题？

这是从数据库取出的数据，现在想变为这种json格式,请问用什么方法比较合适？
从数据库获取数据是通过ashx实现的
   var data1 = [{
                    text: "p1",
                    nodes: [
                    {
                        "text": "A", "id": "1", "nodes": [
                        {"text": "A1","id": "4"},
                        {"text": "A2","id": "5"},
                        {"text": "A3","id": "6"}
                        ]
                    },
                    {
                        "text": "B","id": "2","nodes": [
                         {"text": "B1","id": "7"},
                         {"text": "B2", "id": "9"}
                         ]
                   },
                    {
                       "text": "C","id": "11","nodes": [
                        {"text": "C1","id": "8","nodes": [
                        {"text": "C2","id": "10"}
                         ]
                         }
                         ]
                   },
                    {"text": "p1-1","id": "00001"},
                    {"text": "p1-2","id": "00002"},
                    {"text": "p1-3","id": "00003"},
                    {
                        "text": "p1-4", "id": "00004", "nodes": [                   
                        {"text": "p1-1-1","id": "00005"},
                        {"text": "p1-1-2","id": "00005"}
                        ]
                    }
                    ]                }]