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

原文链接：https://blog.csdn.net/db_guy/article/details/53302832