我有一个以下格式的jsonb数据,带有嵌套数组
{
"outerArray": [
{
"price": {
"amount": 108.95,
"currencyCode": "GBP"
},
"innerArray": [
{
"details": {
"field1": "val1",
"field2": "val2",
"field3": "val3"
},
"otherDetail": {
"date": "2016-07-23",
"time": "19:43:00"
},
"innerMostArray": [
{
"A1": "A1"
},
{
"B1": "B1"
}
]
}
],
"someField": "values"
},
{
"price": {
"amount": 108.95,
"currencyCode": "GBP"
},
"innerArray": [
{
"details": {
"field1": "val1",
"field2": "val2",
"field3": "val3"
},
"otherDetail": {
"date": "2016-07-23",
"time": "19:43:00"
},
"innerMostArray": [
{
"A1": "A1"
},
{
"B1": "B1"
}
]
}
],
"someField": "values"
}
]
}
我想在此上写一个检索查询,以保持相同的json结构,但隐藏字段" price"," details" ," otherDetail"和" someField"
检索到的结果应如下所示
{
"outerArray": [
{
"innerArray": [
{
"innerMostArray": [
{
"A1": "A1"
},
{
"B1": "B1"
}
]
}
]
},
{
"innerArray": [
{
"innerMostArray": [
{
"A1": "A1"
},
{
"B1": "B1"
}
]
}
]
}
]
}
可以这样做吗?
答案 0 :(得分:1)
请始终指定您正在使用的PostgreSQL版本。下面的示例应该适用于版本v9.5 +。
我会通过使用jsonb_build_object()
和jsonb_build_array()
函数构建您需要的JSONB对象来实现此目的:
示例查询:
WITH test(data) AS ( VALUES
('{
"outerArray": [
{
"price": {
"amount": 108.95,
"currencyCode": "GBP"
},
"innerArray": [
{
"details": {
"field1": "val1",
"field2": "val2",
"field3": "val3"
},
"otherDetail": {
"date": "2016-07-23",
"time": "19:43:00"
},
"innerMostArray": [
{
"A1": "A1"
},
{
"B1": "B1"
}
]
}
],
"someField": "values"
},
{
"price": {
"amount": 108.95,
"currencyCode": "GBP"
},
"innerArray": [
{
"details": {
"field1": "val1",
"field2": "val2",
"field3": "val3"
},
"otherDetail": {
"date": "2016-07-23",
"time": "19:43:00"
},
"innerMostArray": [
{
"A1": "A1"
},
{
"B1": "B1"
}
]
}
],
"someField": "values"
}
]}'::JSONB)
)
SELECT
jsonb_build_object(
'outerArray',
array_agg(
jsonb_build_object(
'innerArray',
json_build_array(
json_build_object(
'innerMostArray',
innerArray->'innerMostArray')
)
)
)
) as result
FROM test t,
jsonb_array_elements(t.data->'outerArray') as outerElement,
jsonb_array_elements(outerElement->'innerArray') as innerArray;
结果:
result
----------------------------------------------------------------------------------------------------------------------------------------------------------
{"outerArray": [{"innerArray": [{"innerMostArray": [{"A1": "A1"}, {"B1": "B1"}]}]}, {"innerArray": [{"innerMostArray": [{"A1": "A1"}, {"B1": "B1"}]}]}]}
(1 row)