Re: ECPG insert into table name as a variable

From: Michael Meskes <meskes(at)postgresql(dot)org>
To: Ryan Mooney <ryan(at)pcslink(dot)com>
Cc: pgsql-interfaces(at)postgresql(dot)org
Subject: Re: ECPG insert into table name as a variable
Date: 2003-09-24 07:25:42
Message-ID: 20030924072542.GA633@feivel.fam-meskes.de
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On Tue, Sep 23, 2003 at 11:12:07AM -1000, Ryan Mooney wrote:
> EXEC SQL INSERT INTO :tname (host, point, type, cooked) VALUES (:host, :name, :type, :cooked);

This is not possible as of now, but of course could be implemented.

> When I tried hacking the resulting C code (as a test exercise) like:
>
> { ECPGdo(__LINE__, 0, 1, NULL, "insert into ? ( host , point , type , cooked ) values ( ? , ? , ? , ? )",
> ECPGt_char,&(tname),(long)0,(long)1,1*sizeof(char),

You need to specify the indicator here as this:

ECPGt_NO_INDICATOR, NULL , 0L, 0L, 0L,

> ECPGt_char,&(host),(long)0,(long)1,1*sizeof(char),
> ECPGt_NO_INDICATOR, NULL , 0L, 0L, 0L,
> ECPGt_char,&(name),(long)0,(long)1,1*sizeof(char),
> ECPGt_NO_INDICATOR, NULL , 0L, 0L, 0L,
> ECPGt_char,&(type),(long)1,(long)1,1*sizeof(char),
> ECPGt_NO_INDICATOR, NULL , 0L, 0L, 0L,
> ECPGt_char,&(cooked),(long)1,(long)1,1*sizeof(char),
> ECPGt_NO_INDICATOR, NULL , 0L, 0L, 0L,
> ECPGt_char,(starttime),(long)30,(long)1,30*sizeof(char),
> ECPGt_NO_INDICATOR, NULL , 0L, 0L, 0L,
> ECPGt_char,(interval),(long)30,(long)1,30*sizeof(char),
> ECPGt_NO_INDICATOR, NULL , 0L, 0L, 0L,
>
> it got all funny and didn't work very well (well ok it didn't work at all):
> pg.pgc:129 SQL Insert failed: Invalid statement name (null) in line 124.
>
> So, I was wondering am I just missing some obvious way to do this, or
> is this not supported at all?

So far it is not, sorry.

Michael
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Michael Meskes
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