json解析到数据库的有关问题，涉及到对象数组

json解析到数据库的问题，涉及到对象数组
json如下：
{
  "title": "newFlow_2",
  "nodes": {
    "demo_node_1": {
      "name": "node_1",
      "left": 127,
      "top": 156,
      "type": "start round",
      "width": 24,
      "height": 24,
      "alt": true,
      "marked": true
    },
    "demo_node_2": {
      "name": "node_2",
      "left": 492,
      "top": 158,
      "type": "end",
      "width": 86,
      "height": 24,
      "alt": true,
      "marked": true
    },
    "demo_node_3": {
      "name": "node_3",
      "left": 291,
      "top": 157,
      "type": "task",
      "width": 86,
      "height": 24,
      "alt": true,
      "marked": true
    },
    "demo_node_6": {
      "name": "node_6",
      "left": 629,
      "top": 255,
      "type": "task",
      "width": 86,
      "height": 24,
      "alt": true
    },
    "demo_node_8": {
      "name": "node_8",
      "left": 433,
      "top": 347,
      "type": "fork",
      "width": 86,
      "height": 24,
      "alt": true
    },
    "demo_node_10": {
      "name": "node_10",
      "left": 632,
      "top": 347,
      "type": "task",
      "width": 86,
      "height": 24,
      "alt": true
    },
    "demo_node_11": {
      "name": "node_11",
      "left": 633,
      "top": 419,
      "type": "task",
      "width": 86,
      "height": 24,
      "alt": true
    }
  },
  "lines": {
    "demo_line_4": {
      "type": "sl",
      "from": "demo_node_1",
      "to": "demo_node_3",
      "name": "",
      "marked": true
    },
    "demo_line_5": {
      "type": "sl",
      "from": "demo_node_3",
      "to": "demo_node_2",
      "name": "",
      "marked": true
    },
    "demo_line_9": {
      "type": "sl",
      "from": "demo_node_2",
      "to": "demo_node_8",
      "name": ""
    },
    "demo_line_12": {
      "type": "sl",
      "from": "demo_node_8",
      "to": "demo_node_6",
      "name": ""
    },
    "demo_line_13": {
      "type": "sl",
      "from": "demo_node_8",
      "to": "demo_node_10",
      "name": ""
    },
    "demo_line_14": {
      "type": "sl",
      "from": "demo_node_8",
      "to": "demo_node_11",
      "name": ""
    }
  },