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| author | Andrew Dunstan <andrew@dunslane.net> | 2022-03-03 13:11:14 -0500 |
|---|---|---|
| committer | Andrew Dunstan <andrew@dunslane.net> | 2022-03-29 16:57:13 -0400 |
| commit | 1a36bc9dba8eae90963a586d37b6457b32b2fed4 (patch) | |
| tree | eeb155046082dda9284bd8c298874d802bcc37cb /src/include/utils/jsonfuncs.h | |
| parent | 3d067c53b26dfeb95da0d75a65614b4d7b45c317 (diff) | |
| download | postgresql-1a36bc9dba8eae90963a586d37b6457b32b2fed4.tar.gz postgresql-1a36bc9dba8eae90963a586d37b6457b32b2fed4.zip | |
SQL/JSON query functions
This introduces the SQL/JSON functions for querying JSON data using
jsonpath expressions. The functions are:
JSON_EXISTS()
JSON_QUERY()
JSON_VALUE()
All of these functions only operate on jsonb. The workaround for now is
to cast the argument to jsonb.
JSON_EXISTS() tests if the jsonpath expression applied to the jsonb
value yields any values. JSON_VALUE() must return a single value, and an
error occurs if it tries to return multiple values. JSON_QUERY() must
return a json object or array, and there are various WRAPPER options for
handling scalar or multi-value results. Both these functions have
options for handling EMPTY and ERROR conditions.
Nikita Glukhov
Reviewers have included (in no particular order) Andres Freund, Alexander
Korotkov, Pavel Stehule, Andrew Alsup, Erik Rijkers, Zihong Yu,
Himanshu Upadhyaya, Daniel Gustafsson, Justin Pryzby.
Discussion: https://postgr.es/m/cd0bb935-0158-78a7-08b5-904886deac4b@postgrespro.ru
Diffstat (limited to 'src/include/utils/jsonfuncs.h')
| -rw-r--r-- | src/include/utils/jsonfuncs.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/include/utils/jsonfuncs.h b/src/include/utils/jsonfuncs.h index cd16b6c0c84..62dc3d88a42 100644 --- a/src/include/utils/jsonfuncs.h +++ b/src/include/utils/jsonfuncs.h @@ -58,4 +58,8 @@ extern Jsonb *transform_jsonb_string_values(Jsonb *jsonb, void *action_state, extern text *transform_json_string_values(text *json, void *action_state, JsonTransformStringValuesAction transform_action); +extern Datum json_populate_type(Datum json_val, Oid json_type, + Oid typid, int32 typmod, + void **cache, MemoryContext mcxt, bool *isnull); + #endif |