json,postgresql , how PostgreSQL update the column type json with json array
how PostgreSQL update the column type json with json array
Question:
Tag: json,postgresql
In PostgreSQL, my column type is json , the data is json array like:
[{"attsId": "42a2ce04-52ab-4a3c-8dfb-98c3d14b307d", "planId": 46, "filePath": "fileOperate\\upload", "cfileName": "潜在客户名单 (1).xls", "ufileName": "42a2ce04-52ab-4a3c-8dfb-98c3d14b307d.xls"}, {"attsId": "1adb2f13-00b0-4780-ae76-7a068dc3289c", "planId": 46, "filePath": "fileOperate\\upload", "cfileName": "潜在客户名单.xls", "ufileName": "1adb2f13-00b0-4780-ae76-7a068dc3289c.xls"}, {"attsid": "452f6c62-28df-47c7-8c30-038339f7b223", "planid": 48.0, "filepath": "fileoperate\\upload", "cfilename": "技术市场印花税.xls", "ufilename": "452f6c62-28df-47c7-8c30-038339f7b223.xls"}]
i want update one of the array date like:
UPDATE plan_base set atts->1='{"planId":"71"}' where id= 46;
how to do it? help me please
Answer:
Here are two helper functions, to achieve your goal (requires PostgreSQL 9.3+):
This one can be used like UPDATEs (only updates an index, if it's already exists):
CREATE OR REPLACE FUNCTION "json_array_update_index"(
"json" json,
"index_to_update" INTEGER,
"value_to_update" anyelement
)
RETURNS json
LANGUAGE sql
IMMUTABLE
STRICT
AS $function$
SELECT concat('[', string_agg("element"::text, ','), ']')::json
FROM (SELECT CASE row_number() OVER () - 1
WHEN "index_to_update" THEN to_json("value_to_update")
ELSE "element"
END "element"
FROM json_array_elements("json") AS "element") AS "elements"
$function$;
This one can be used, like an UPSERT (updates an index, if it exists, or creates, if not -- using some default value to fill up unused indexes):
CREATE OR REPLACE FUNCTION "json_array_set_index"(
"json" json,
"index_to_set" INTEGER,
"value_to_set" anyelement,
"default_to_fill" json DEFAULT 'null'
)
RETURNS json
LANGUAGE sql
IMMUTABLE
STRICT
AS $function$
SELECT concat('[', string_agg((CASE "index"
WHEN "index_to_set" THEN to_json("value_to_set")
ELSE COALESCE("json" -> "index", "default_to_fill")
END)::text, ','), ']')::json
FROM generate_series(0, GREATEST("index_to_set", json_array_length("json") - 1)) AS "index"
$function$;
With these, you can UPDATE any json data, like:
UPDATE plan_base
SET atts = json_array_update_index(atts, 1, '{"planId":"71"}'::json)
WHERE id = 46;
Important! Json arrays are indexed from 0 (unlike other PostgreSQL arrays). My functions respect this kind of indexing.
SQLFiddle
More about updating a JSON object:
Update: functions are now compacted.
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