Hi all,
I'm talking about the source code of pgsql and I want to know how the
typing system works in pgsql.
A few functions can help us do the type conversion, for example:
Int32GetDatum -- convert a integer to a datum
Float8GetDatum -- convert double to a datum
cstring_to_text -- convert a
hello
you have to look to postgresql/src/backend/utils/adt/numeric.c functions -
then you can call float8_numeric
Numeric result = DatumGetNumeric(DirectFunctionCall1(float8_numeric,
Float8GetDatum(dx));
regards
Pavel
2014-02-24 7:45 GMT+01:00 Felix.徐 ygnhz...@gmail.com:
Hi all,
I'm
2014-02-24 8:42 GMT+01:00 Felix.徐 ygnhz...@gmail.com:
Thanks , I find another function called OidInputFunctionCall which can
automatically generate a datum from a string for any data type, but seems
it is not recommended in the comments.
it is little bit different - and it needs a second
