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This introduces the following SQL/JSON functions for querying JSON data using jsonpath expressions: JSON_EXISTS(), which can be used to apply a jsonpath expression to a JSON value to check if it yields any values. JSON_QUERY(), which can be used to to apply a jsonpath expression to a JSON value to get a JSON object, an array, or a string. There are various options to control whether multi-value result uses array wrappers and whether the singleton scalar strings are quoted or not. JSON_VALUE(), which can be used to apply a jsonpath expression to a JSON value to return a single scalar value, producing an error if it multiple values are matched. Both JSON_VALUE() and JSON_QUERY() functions have options for handling EMPTY and ERROR conditions, which can be used to specify the behavior when no values are matched and when an error occurs during jsonpath evaluation, respectively. Author: Nikita Glukhov <n.gluhov@postgrespro.ru> Author: Teodor Sigaev <teodor@sigaev.ru> Author: Oleg Bartunov <obartunov@gmail.com> Author: Alexander Korotkov <aekorotkov@gmail.com> Author: Andrew Dunstan <andrew@dunslane.net> Author: Amit Langote <amitlangote09@gmail.com> Author: Peter Eisentraut <peter@eisentraut.org> Author: Jian He <jian.universality@gmail.com> 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, Álvaro Herrera, Jian He, Anton A. Melnikov, Nikita Malakhov, Peter Eisentraut, Tomas Vondra Discussion: https://postgr.es/m/cd0bb935-0158-78a7-08b5-904886deac4b@postgrespro.ru Discussion: https://postgr.es/m/20220616233130.rparivafipt6doj3@alap3.anarazel.de Discussion: https://postgr.es/m/abd9b83b-aa66-f230-3d6d-734817f0995d%40postgresql.org Discussion: https://postgr.es/m/CA+HiwqHROpf9e644D8BRqYvaAPmgBZVup-xKMDPk-nd4EpgzHw@mail.gmail.com Discussion: https://postgr.es/m/CA+HiwqE4XTdfb1nW=Ojoy_tQSRhYt-q_kb6i5d4xcKyrLC1Nbg@mail.gmail.com
35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
/* -----------------------------------------------------------------------
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* formatting.h
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*
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* src/include/utils/formatting.h
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*
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*
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* Portions Copyright (c) 1999-2024, PostgreSQL Global Development Group
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*
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* The PostgreSQL routines for a DateTime/int/float/numeric formatting,
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* inspired by the Oracle TO_CHAR() / TO_DATE() / TO_NUMBER() routines.
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*
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* Karel Zak
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*
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* -----------------------------------------------------------------------
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*/
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#ifndef _FORMATTING_H_
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#define _FORMATTING_H_
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extern char *str_tolower(const char *buff, size_t nbytes, Oid collid);
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extern char *str_toupper(const char *buff, size_t nbytes, Oid collid);
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extern char *str_initcap(const char *buff, size_t nbytes, Oid collid);
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extern char *asc_tolower(const char *buff, size_t nbytes);
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extern char *asc_toupper(const char *buff, size_t nbytes);
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extern char *asc_initcap(const char *buff, size_t nbytes);
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extern Datum parse_datetime(text *date_txt, text *fmt, Oid collid, bool strict,
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Oid *typid, int32 *typmod, int *tz,
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struct Node *escontext);
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extern bool datetime_format_has_tz(const char *fmt_str);
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#endif
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