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As a follow-up to this FAQ, it seems that the sp_parse_json system procedure only supports numbers as double or integer: begin
declare MyJson long varchar;
select '{"MyDouble": -12345678901234.567890,
"MyEValue": -1e6,
"MyInt": -2147483648,
"MyBigInt1": 2147483648,
"MyBigInt2": -1234567890123456789,
"MyBit": 1}' into MyJson;
drop variable if exists sql_row;
call sp_parse_json ('sql_row', MyJson);
select '1 MyDouble' as "Variable", exprtype('select sql_row.MyDouble', 1) as Data_Type, sql_row.MyDouble as Value
union all
select '2 MyEValue', exprtype('select sql_row.MyEValue', 1), sql_row.MyEValue
union all
select '3 MyInt', exprtype('select sql_row.MyInt', 1), sql_row.MyInt
union all
select '4 MyBigInt1', exprtype('select sql_row.MyBigInt1', 1), sql_row.MyBigInt1
union all
select '5 MyBigInt2', exprtype('select sql_row.MyBigInt2', 1), sql_row.MyBigInt2
union all
select '6 MyBit', exprtype('select sql_row.MyBit', 1), sql_row.MyBit
order by 1;
end;
returns 1 MyDouble;double;-12345678901234,568 2 MyEValue;double;-1000000 3 MyInt;integer;-2147483648 4 MyBigInt1;integer;2147483647 <-- wrong 5 MyBigInt2;integer;-2147483648 <-- wrong 6 MyBit;integer;1 This was tested with 17.0.10.6175. Resume: MyBigInt1 and MyBigInt2 are wrongly limited to the maximum positive resp. negative integer values, so it seems that JSON numbers in the format without fraction and exponent are wrongly casted to integer instead of bigint or other "huger" types. |
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question asked: 30 Sep '20, 05:03
question was seen: 453 times
last updated: 05 Oct '20, 03:36
FWIW, it does not make a difference if the according variable used with sp_parse_json is declared to have a bigint component beforehand - it will nevertheless be returned as an integer:
begin declare MyJson long varchar; select '{"MyBigInt1": 2147483648}' into MyJson; drop variable if exists sql_row; create variable sql_row row(MyBigInt1 bigint); select '1 MyBigInt1', exprtype('select sql_row.MyBigInt1', 1), sql_row.MyBigInt1; call sp_parse_json ('sql_row', MyJson); select '1 MyBigInt1', exprtype('select sql_row.MyBigInt1', 1), sql_row.MyBigInt1; end;returns