Postgres jsonb,嵌套数组查询以隐藏特定字段
Postgres jsonb, nested array querying to hide specific fields
我有以下格式的 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"
}
]
}
我想对此编写检索查询,以保持相同的 json 结构但隐藏字段 "price"、"details"、"otherDetail" 和 "someField"
检索到的结果应该是这样的
{
"outerArray": [
{
"innerArray": [
{
"innerMostArray": [
{
"A1": "A1"
},
{
"B1": "B1"
}
]
}
]
},
{
"innerArray": [
{
"innerMostArray": [
{
"A1": "A1"
},
{
"B1": "B1"
}
]
}
]
}
]
}
这可以做到吗?
请始终指定您正在使用的 PostgreSQL 版本。下面的示例应该适用于 v9.5+ 版本。
我会通过使用 jsonb_build_object()
and jsonb_build_array()
函数构建您需要的 JSONB 对象来解决这个问题:
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)
我有以下格式的 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"
}
]
}
我想对此编写检索查询,以保持相同的 json 结构但隐藏字段 "price"、"details"、"otherDetail" 和 "someField"
检索到的结果应该是这样的
{
"outerArray": [
{
"innerArray": [
{
"innerMostArray": [
{
"A1": "A1"
},
{
"B1": "B1"
}
]
}
]
},
{
"innerArray": [
{
"innerMostArray": [
{
"A1": "A1"
},
{
"B1": "B1"
}
]
}
]
}
]
}
这可以做到吗?
请始终指定您正在使用的 PostgreSQL 版本。下面的示例应该适用于 v9.5+ 版本。
我会通过使用 jsonb_build_object()
and jsonb_build_array()
函数构建您需要的 JSONB 对象来解决这个问题:
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)