我想知道我是否可以通过属性名称而不是位置来获取数组的元素。例如,这是我传入的数据:
{
"salesdata": {
"productsbyzone": {
"zones": [{
"eastzone": "shirts, trousers"
},
{
"westzone": "slacks"
},
{
"northzone": "gowns"
},
{
"southzone": "maxis"
}
]
}
}
}
我打算将其移至 SQL 数据库,并且数据库中的每个区域都有列。问题是每个 json 中不同区域的顺序会发生变化。我成功地使用了以下查询,直到我意识到每个 json 中区域的位置发生了变化:
WITH
salesData AS
(
SELECT
(c.salesdata.productsbyzone.zone,0) as eastzone,
(c.salesdata.productsbyzone.zone,1) as westzone,
(c.salesdata.productsbyzone.zone,2) as northzone,
(c.salesdata.productsbyzone.zone,3) as sourthzone,
FROM [sales-data] as c
)
SELECT
eastzone.eastzone as PRODUCTS_EAST,
westzone.westzone as PRODUCTS_WEST,
northzone.northzone as PRODUCTS_NORTH,
southzone.southzone as PRODUCTS_SOUTH
INTO PRODUCTSDATABASE
FROM salesData
需要一种通过名称而不是位置来引用这些字段的方法。
最佳答案
我推荐一个解决方案:使用 JavaScript UDF在 azure 流作业中完成列排序。
请引用我的示例:
输入数据(打乱顺序):
{
"salesdata": {
"productsbyzone": {
"zones": [{
"westzone": "slacks"
},
{
"eastzone": "shirts, trousers"
},
{
"northzone": "gowns"
},
{
"southzone": "maxis"
}
]
}
}
}
js udf 代码:
function test(arg) {
var z = arg;
var obj = {
eastzone: "",
westzone: "",
northzone: "",
southzone: ""
}
for(var i=0;i<z.length;i++){
switch(Object.keys(z[i])[0]){
case "eastzone":
obj.eastzone = z[i]["eastzone"];
continue;
case "westzone":
obj.westzone = z[i]["westzone"];
continue;
case "northzone":
obj.northzone = z[i]["northzone"];
continue;
case "southzone":
obj.southzone = z[i]["southzone"];
continue;
}
}
return obj;
}
您可以在obj
参数中定义您想要的顺序
SQL:
WITH
c AS
(
SELECT
udf.test(jsoninput.salesdata.productsbyzone.zones) as result
from jsoninput
),
b AS
(
SELECT
c.result.eastzone as east,c.result.westzone as west,c.result.northzone as north,c.result.southzone as south
from c
)
SELECT
b.east,b.west,b.north,b.south
INTO
jaycosmos
FROM
b
输出:
希望对您有帮助。
关于sql - Azure 流分析 : Get Array Elements by name,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48727540/