ECPG insert into table name as a variable

No, not like that. But it'd be nice...

No do what you want consider something along the lines of:

snprintf(l_cmd, sizeof(l_cmd),
"ALTER TABLE %s ADD COLUMN %s%d FLOAT4 NULL",
tables[t].table, tables[t].column, n);
EXEC SQL EXECUTE IMMEDIATE :l_cmd;

or, more useful:

else
snprintf(l_cmd, sizeof(l_cmd), "SELECT src.shot, %s FROM %s src WHERE %s IS NOT NULL AND channel = %d", attribute, table, nullattr, channel);

EXEC_SQL_BEGIN;

/* declare & open */
EXEC SQL PREPARE lofsdb_SelectAttr_stmt FROM :l_cmd;
EXEC SQL DECLARE lofsdb_SelectAttr_cur CURSOR FOR lofsdb_SelectAttr_stmt;
EXEC SQL OPEN lofsdb_SelectAttr_cur;

and then just treat the CURSOR as normal... But for INSERTs the first
EXECUTE IMMEDIATE will do.

L.

Ryan Mooney writes:
>
>
> I was doing testing on an app and wanted to make a table name a variable
> so I can change it via a config file (instead of re-compile/relink).
>
> like so:
> EXEC SQL INSERT INTO :tname (host, point, type, cooked) VALUES (:host, :name, :type, :cooked);
>
> This fails ecpg preprocess with "ERROR: syntax error at or near ":tname" whereas if the table
> name is specified statically it works fine, like:
> EXEC SQL INSERT INTO tname (host, point, type, cooked) VALUES (:host, :name, :type, :cooked);
>
> 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),
> 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?
>
> Thanks
>
>
> --
> >-=-=-=-=-=-=-<>-=-=-=-=-=-<>-=-=-=-=-=-<>-=-=-=-=-=-<>-=-=-=-=-=-=-<
> Ryan Mooney ryan(at)pcslink(dot)com
> <-=-=-=-=-=-=-><-=-=-=-=-=-><-=-=-=-=-=-><-=-=-=-=-=-><-=-=-=-=-=-=->