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New json_nextract() function that works like json_extract() except that it

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returns NULL instead of raising an error if the first argument is not
well-formed JSON.  Or if the first argument is not well-formed JSON and
the second argument is '$', then return the first argument quoted.  The
"->" and "->>" operators are converted to use json_nextract().

FossilOrigin-Name: dc00f5286d26524b149de071490320afaa203fec5777b3eb813f07963614861a
This commit is contained in:
drh
2022-01-07 17:08:48 +00:00
parent a4e4e18494
commit 338b1fde62
4 changed files with 45 additions and 15 deletions
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19
test/json102.test
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@@ -72,6 +72,9 @@ do_execsql_test json102-250 {
SELECT json_extract('{"a":2,"c":[4,5,{"f":7}]}', '$');
} {{{"a":2,"c":[4,5,{"f":7}]}}}
do_execsql_test json102-251 {
SELECT json_nextract('{"a":2,"c":[4,5,{"f":7}]}', '$');
} {{{"a":2,"c":[4,5,{"f":7}]}}}
do_execsql_test json102-252 {
SELECT '{"a":2,"c":[4,5,{"f":7}]}' -> '$';
} {{{"a":2,"c":[4,5,{"f":7}]}}}
do_execsql_test json102-260 {
@@ -83,6 +86,22 @@ do_execsql_test json102-261 {
do_execsql_test json102-262 {
SELECT '{"a":2,"c":[4,5,{"f":7}]}' -> 'c';
} {{[4,5,{"f":7}]}}
do_catchsql_test json102-265 {
SELECT json_extract('[1,2,3', '$[2]');
} {1 {malformed JSON}}
do_catchsql_test json102-266 {
SELECT json_nextract('[1,2,3', '$[2]');
} {0 {{}}}
do_catchsql_test json102-267 {
SELECT json_extract('[1,2,3', '$');
} {1 {malformed JSON}}
do_catchsql_test json102-268 {
SELECT json_nextract('[1,2,3', '$');
} {0 {{"[1,2,3"}}}
do_catchsql_test json102-269 {
SELECT '[1,2,3' ->> '$';
} {0 {{"[1,2,3"}}}
do_execsql_test json102-270 {
SELECT json_extract('{"a":2,"c":[4,5,{"f":7}]}', '$.c[2]');
} {{{"f":7}}}