Re: CStringGetTextDatum and other conversions in server-side code

From: John R Pierce <pierce(at)hogranch(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Re: CStringGetTextDatum and other conversions in server-side code
Date: 2016-03-03 06:15:11
Message-ID: 56D7D66F.1050005@hogranch.com
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On 3/2/2016 9:36 PM, david(at)andl(dot)org wrote:
> [dmb>] This is fairly easy for ints and reals, but is particularly a problem for all the variable length types (eg text, time and decimal).

all the text types are simply a 32bit length and an array of
characters. you need to be aware of the encoding, and null is just
another character.

single and double real/floats are stored in standard x86 IEEE floating
point.

the date and time types are all fixed lengths, mostly a long int or two.

numeric in postgres is a bit tricky. its a decimal number stored in
base 10000 as a series of short integers, and can represent. does your
language even have a decimal or BCD or something numeric type?

--
john r pierce, recycling bits in santa cruz

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