我已成功将一些JSON数据导入cloudant,JSON数据有三个级别。然后从cloudant创建dashdb仓库,将数据放入关系表中。看来dashdb已经为JSON数据中的每个级别创建了三个表,但是没有为我提供一个连接回顶级的Key。是否有一个自定义,它告诉dashdb如何连接表。 下面是一个示例JSON文档:
{
"_id": "579b56388aa56fd03a4fd0a9",
"_rev": "1-698183d4326352785f213b823749b9f8",
"v": 0,
"startTime": "2016-07-29T12:48:04.204Z",
"endTime": "2016-07-29T13:11:48.962Z",
"userId": "Ranger1",
"uuid": "497568578283117a",
"modes": [
{
"startTime": "2016-07-29T12:54:22.565Z",
"endTime": "2016-07-29T12:54:49.894Z",
"name": "bicycle",
"_id": "579b56388aa56fd03a4fd0b1",
"locations": []
},
{
"startTime": "2016-07-29T12:48:02.477Z",
"endTime": "2016-07-29T12:53:28.503Z",
"name": "walk",
"_id": "579b56388aa56fd03a4fd0ad",
"locations": [
{
"at": "2016-07-29T12:49:05.716Z",
"_id": "579b56388aa56fd03a4fd0b0",
"location": {
"coords": {
"latitude": -34.0418308,
"longitude": 18.3503616,
"accuracy": 37.5,
"speed": 0,
"heading": 0,
"altitude": 0
},
"battery": {
"is_charging": true,
"level": 0.7799999713897705
}
}
},
{
"at": "2016-07-29T12:49:48.488Z",
"_id": "579b56388aa56fd03a4fd0af",
"location": {
"coords": {
"latitude": -34.0418718,
"longitude": 18.3503895,
"accuracy": 33,
"speed": 0,
"heading": 0,
"altitude": 0
},
"battery": {
"is_charging": true,
"level": 0.7799999713897705
}
}
},
{
"at": "2016-07-29T12:50:20.760Z",
"_id": "579b56388aa56fd03a4fd0ae",
"location": {
"coords": {
"latitude": -34.0418788,
"longitude": 18.3503887,
"accuracy": 33,
"speed": 0,
"heading": 0,
"altitude": 0
},
"battery": {
"is_charging": true,
"level": 0.7799999713897705
}
}
}
]
},
{
"startTime": "2016-07-29T12:53:37.137Z",
"endTime": "2016-07-29T12:54:18.505Z",
"name": "carshare",
"_id": "579b56388aa56fd03a4fd0ac",
"locations": []
},
{
"startTime": "2016-07-29T12:54:54.112Z",
"endTime": "2016-07-29T13:11:47.818Z",
"name": "bus",
"_id": "579b56388aa56fd03a4fd0aa",
"locations": [
{
"at": "2016-07-29T13:00:08.039Z",
"_id": "579b56388aa56fd03a4fd0ab",
"location": {
"coords": {
"latitude": -34.0418319,
"longitude": 18.3503623,
"accuracy": 36,
"speed": 0,
"heading": 0,
"altitude": 0
},
"battery": {
"is_charging": false,
"level": 0.800000011920929
}
}
}
]
}
]
}
在dashdb中创建的三个表的SQL显示了每个表中的所有字段。请注意,我看不到FK,“_ ID”字段对每个表都是唯一的。
SELECT ENDTIME,STARTTIME,USERID,UUID,V,"_ID","_REV"
FROM <schemaname>.RANGER_DATA
where "_ID" = '579b56388aa56fd03a4fd0a9'
SELECT ARRAY_INDEX,ENDTIME,NAME,STARTTIME,TOTALPAUSEDMS,"_ID"
FROM <schemaname>.RANGER_DATA_MODES
where "_ID" = '579b56388aa56fd03a4fd0b1'
SELECT ARRAY_INDEX,AT,LOCATION_BATTERY_IS_CHARGING,LOCATION_BATTERY_LEVEL,LOCATION_COORDS_ACCURACY,LOCATION_COORDS_ALTITUDE,LOCATION_COORDS_HEADING,LOCATION_COORDS_LATITUDE,LOCATION_COORDS_LONGITUDE,LOCATION_COORDS_SPEED,RANGER_DATA_MODES,"_ID"
FROM <schemaname>.RANGER_DATA_MODES_LOCATIONS
where "_ID" = '579b56388aa56fd03a4fd0b0'
答案 0 :(得分:0)
Cloudant对每个文档使用_id作为其UID。仓库任务似乎迭代这些文档,并假设每次看到新的_id时都有一个新文档。
因为您在模式和位置使用_id,这将在SQL DB中产生不希望的结果。
将模式和位置中的_id重命名为其他内容应该可以解决问题。