Обсуждение: $Body$
Hi List; What does it mean the $BODY$ when writing the function? In other words: why to use the $ sign? Regards Bilal
It's just a string constant:
http://www.postgresql.org/docs/8.4/interactive/sql-syntax-lexical.html#SQL-SYNTAX-CONSTANTS
It could be anything between the dollar signs, but BODY is self-
documenting.
On Aug 30, 2009, at 3:37 PM, bilal ghayyad wrote:
> Hi List;
>
> What does it mean the $BODY$ when writing the function? In other
> words: why to use the $ sign?
>
> Regards
> Bilal
>
>
>
>
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-- Christophe Pettus
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On Sun, Aug 30, 2009 at 03:37:56PM -0700, bilal ghayyad wrote: > Hi List; > > What does it mean the $BODY$ when writing the function? In other > words: why to use the $ sign? See http://www.postgresql.org/docs/current/static/sql-syntax-lexical.html#SQL-SYNTAX-DOLLAR-QUOTING Cheers, David. -- David Fetter <david@fetter.org> http://fetter.org/ Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter Skype: davidfetter XMPP: david.fetter@gmail.com Remember to vote! Consider donating to Postgres: http://www.postgresql.org/about/donate
This is the idea david: Why in the constant string we use the tag and we do not use the tag in the BODY? In other wrods, why we write it $BODY$ and does not write it as $q$BODY$q$ or as $$BODY$$? Also why in the single-quote syntax, each backslash will be written as four backslashes? While this will not be needed inthe dolar-quoted string? Regards Bilal --- On Sun, 8/30/09, David Fetter <david@fetter.org> wrote: > From: David Fetter <david@fetter.org> > Subject: Re: [GENERAL] $Body$ > To: "bilal ghayyad" <bilmar_gh@yahoo.com> > Cc: pgsql-general@postgresql.org > Date: Sunday, August 30, 2009, 6:44 PM > On Sun, Aug 30, 2009 at 03:37:56PM > -0700, bilal ghayyad wrote: > > Hi List; > > > > What does it mean the $BODY$ when writing the > function? In other > > words: why to use the $ sign? > > See > http://www.postgresql.org/docs/current/static/sql-syntax-lexical.html#SQL-SYNTAX-DOLLAR-QUOTING > > Cheers, > David. > -- > David Fetter <david@fetter.org> > http://fetter.org/ > Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: > dfetter > Skype: davidfetter XMPP: david.fetter@gmail.com > > Remember to vote! > Consider donating to Postgres: http://www.postgresql.org/about/donate >
On Sun, Aug 30, 2009 at 04:13:18PM -0700, bilal ghayyad wrote: > This is the idea david: > > Why in the constant string we use the tag and we do not use the tag > in the BODY? > > In other wrods, why we write it $BODY$ and does not write it as > $q$BODY$q$ or as $$BODY$$? The string BODY in $BODY$ has no syntactical significance. You could just as easily use $$ or $supercalifragilisticexpialidocious$. The only place where the string inside matters is when you're nesting dollar quoted structures. > Also why in the single-quote syntax, each backslash will be written > as four backslashes? While this will not be needed in the > dolar-quoted string? Dollar quoting was specifically invented so that people would not have to use torrents of backslashes and/or single quotes. Cheers, David. -- David Fetter <david@fetter.org> http://fetter.org/ Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter Skype: davidfetter XMPP: david.fetter@gmail.com Remember to vote! Consider donating to Postgres: http://www.postgresql.org/about/donate