database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-12-21 05:21:08 +03:00
Code Activity

SQL JSON functions

Browse Source 
This Patch introduces three SQL standard JSON functions:

JSON() (incorrectly mentioned in my commit message for f4fb45d15c)
JSON_SCALAR()
JSON_SERIALIZE()

JSON() produces json values from text, bytea, json or jsonb values, and
has facilitites for handling duplicate keys.
JSON_SCALAR() produces a json value from any scalar sql value, including
json and jsonb.
JSON_SERIALIZE() produces text or bytea from input which containis or
represents json or jsonb;

For the most part these functions don't add any significant new
capabilities, but they will be of use to users wanting standard
compliant JSON handling.

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
This commit is contained in:
Andrew Dunstan
2022-03-03 13:15:13 -05:00
parent 8e053dc6df
commit 606948b058
22 changed files with 880 additions and 82 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
src/include/utils/json.h
View File

@@ -16,16 +16,35 @@
#include "lib/stringinfo.h"
typedef enum /* type categories for datum_to_json */
{
JSONTYPE_NULL, /* null, so we didn't bother to identify */
JSONTYPE_BOOL, /* boolean (built-in types only) */
JSONTYPE_NUMERIC, /* numeric (ditto) */
JSONTYPE_DATE, /* we use special formatting for datetimes */
JSONTYPE_TIMESTAMP,
JSONTYPE_TIMESTAMPTZ,
JSONTYPE_JSON, /* JSON itself (and JSONB) */
JSONTYPE_ARRAY, /* array */
JSONTYPE_COMPOSITE, /* composite */
JSONTYPE_CAST, /* something with an explicit cast to JSON */
JSONTYPE_OTHER /* all else */
} JsonTypeCategory;
/* functions in json.c */
extern void escape_json(StringInfo buf, const char *str);
extern char *JsonEncodeDateTime(char *buf, Datum value, Oid typid,
const int *tzp);
extern bool to_json_is_immutable(Oid typoid);
extern void json_categorize_type(Oid typoid, JsonTypeCategory *tcategory,
Oid *outfuncoid);
extern Datum to_json_worker(Datum val, JsonTypeCategory tcategory,
Oid outfuncoid);
extern Datum json_build_object_worker(int nargs, Datum *args, bool *nulls,
Oid *types, bool absent_on_null,
bool unique_keys);
extern Datum json_build_array_worker(int nargs, Datum *args, bool *nulls,
Oid *types, bool absent_on_null);
extern bool json_validate(text *json, bool check_unique_keys);
extern bool json_validate(text *json, bool check_unique_keys, bool throw_error);
#endif /* JSON_H */