2010/8/30 Itagaki Takahiro <itagaki.takah...@gmail.com>:
> On Mon, Aug 30, 2010 at 7:58 PM, Pavel Stehule <pavel.steh...@gmail.com>
> wrote:
>> propsals:
>> * "format" function - uses same formatting as PL/pgSQL RAISE statement
>> * "sprintf" function
>>
>> Now I propose a compromise - "format" function with only three tags:
>> %s .. some string
>> %i .. SQL identifier
>> %l .. string literal
>
> These are just ideas:
>
> * Use $n, as like as PREPARE command.
> It allows for us to swap arguments in any order.
> SELECT format('$2 before $1', 'aaa', 'bbb')
>
what is use case for this feature? I don't see it.
> * Call to_char() functions for each placeholder.
> For example,
> format('=={YYYY-MM-DD}==', tm::timestamp)
> is equivalent to
> '==' || to_char(tm, 'YYYY-MM-DD') || '=='
> '{}' prints the input with the default format.
>
> New languages' libraries might be of some help. LLs, C#, etc.
I though about integration with to_char function too. There are not
technical barrier. And I can live with just {to_char_format} too. It
can be or cannot be mixed with basic tags together - there is
specified a NULL value behave. If we allow {format} syntax, then we
have to specify a escape syntax for { and }. Do you have a some idea?
Regards
Pavel
>
> --
> Itagaki Takahiro
>
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