RE: SQL statement PREPARE does not work in ECPG

Hi Meskes-san

There are two points.

(1)
I attach a new patch. Please review it.

- Preproc replaces any prepared_name to "$0" and changes it to an input-variable
for PREARE with typelist and EXECUTE with paramlist.
$0 is replaced in ecpg_build_params().
It's enable not to change ECPGdo interface.
- Host variables can be used in paramlist of EXECUTE.

(2)
I found some bugs (two types). I didn't fix them and only avoid bison error.

Type1. Bugs or intentional unsupported features.
- EXPLAIN EXECUTE
- CREATE TABLE AS with using clause

e.g.
EXPLAIN EXECUTE st; /* It has not been supported before.*/

ExplainableStmt:
ExecuteStmt
{
- $$ = $1;
+ $$ = $1.name; /* only work arround for bison error */
}

Type2. In multi-bytes encoding environment, a part of character of message is cut off.

It may be very difficult to fix. I pretend I didn't see it for a while.

[ecpglib/error.c]
snprintf(sqlca->sqlerrm.sqlerrmc, sizeof(sqlca->sqlerrm.sqlerrmc), "%s on line %d", message, line);
sqlca->sqlerrm.sqlerrml = strlen(sqlca->sqlerrm.sqlerrmc);
ecpg_log("raising sqlstate %.*s (sqlcode %ld): %s\n",
(int) sizeof(sqlca->sqlstate), sqlca->sqlstate, sqlca->sqlcode, sqlca->sqlerrm.sqlerrmc);

Regards
Ryo Matsumura