Re: The same prepared query yield "-1" the first six times and then "-1.0"

On 2023-08-21 17:31:06 -0400, Dave Cramer wrote:
> On Mon, 21 Aug 2023 at 17:17, Ron <ronljohnsonjr(at)gmail(dot)com> wrote:
>
> On 8/21/23 14:32, Dave Cramer wrote:
>
> [snip]
>
> It has to do with the way the data is being transferred. When the
> driver switches to a named statement it also switches to binary mode
> which means data will be transferred in binary. 
>
> In text we get -1, in binary we get -1.0
>
>
> That seems odd.  Why does it do that?
[...]
> whereas float8send sends the actual binary data on disk, hence -1.0

It should be noted that the binary representation is not "-1.0", but
something like
1 01111111 00000000000000000000000 (in binary or)
B F 8 0 0 0 0 0 (in hex)
(big endian for better readability)

The decimal representation "-1.0" is created by the binary to string
conversion (Java's Float.toString()?). That could also produce "-1" or
"-1E0" or any other equivalent representation. The author of that
routine decided in include ".0" in the output, possibly to signify that
it's a floating point value, not an integer.

hp

--
_ | Peter J. Holzer | Story must make more sense than reality.
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| | | hjp(at)hjp(dot)at | -- Charles Stross, "Creative writing
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