kettle输入组件-JSON Input的使用案例

用例背景说明

数据文件car_factory.js，其内容如下：

{
"RECORDS":[
{
"factory_id":"10",
"factory_name":"一汽奔腾",
"name_index":"Y",
"picture_path":null
},
{
"factory_id":"107",
"factory_name":"劳斯莱斯",
"name_index":"L",
"picture_path":null
},
{
"factory_id":"108",
"factory_name":"阿斯顿马丁",
"name_index":"A",
"picture_path":null
},
{
"factory_id":"11",
"factory_name":"一汽马自达",
"name_index":"Y",
"picture_path":null
}
]
}

现在要将car_factory.js文件加载到mysql数据库中，数据库对应表DDL：

DROP TABLE IF EXISTS car_factory;
CREATE TABLE car_factory (
  factory_id varchar(45) NOT NULL,
  factory_name varchar(100) DEFAULT NULL,
  name_index varchar(1) DEFAULT NULL,
  picture_path varchar(200) DEFAULT NULL,
  PRIMARY KEY (factory_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

1.整体设计

2.JSON Input Step设置

设置json文件

设置字段映射，注意path的填写方式要遵照jsonpath规则，每一级子对象可以用一个.指代，有关jsonpath的说明，参考http://goessner.net/articles/JsonPath/

数据预览

关于kettle组件说明部分参考网址：http://wiki.pentaho.com/display/EAI/Pentaho+Data+Integration+Steps

kettle官方给出的参考用例：

data-integration\samples\transformations\JsonInput - read a dynamic file.ktr
data-integration\samples\transformations\JsonInput - read a file.ktr
data-integration\samples\transformations\JsonInput - read incoming stream.ktr