Re: Issue while calling new PostgreSQL command from a Java Application

You may have to add code to copy inp_str to _copyVacuumStmt(). See how a character array being copied from other _copy* functions.

On Fri, Jul 4, 2014 at 10:43 AM, Ashoke <s.ashoke@gmail.com> wrote:

Hi,

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I have defined a new command my_command in PostgreSQL. This command takes the path of ANALYZE and inside analyze.c, I have a function to do some operations if its my_command.This command takes the input arguments: table name, column name and an input string.

my_command nation (n_nationkey) 'input string';

When I run this command from command line psql, it works as expected. But when I call the same command from a java application, the variable that stores the input string is NULL.

I printed the value of the input string in gram.y file where I have defined my_command.
fprintf (stderr, "I am inside gram.y %s\n",n->inp_str); and the input string is printed correctly.

But when I print stmt->inp_str in the function standard_ProcessUtility() of utility.c for the case T_VacuumStmt, I get the value as NULL. This is as far as I could trace back from analyze.c.

I am not sure how executing the same command from an application can make a difference.

gram.y content gist:

---

MyStmt:        my_keyword qualified_name name_list my_inp_str            {                VacuumStmt *n = makeNode(VacuumStmt);                n->options = VACOPT_ANALYZE;                n->freeze_min_age = -1;                n->freeze_table_age = -1;                n->relation = $2;                n->va_cols = $3;                n->inp_str = $4;                fprintf (stderr, "I am inside gram.y %s\n",n->inp_str);
                $$ = (Node *)n;            }
;

char *inp_str is added to the struct VacuumStmt in parsenodes.h

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Only the newly added char *inp_str(that is different from ANALYZE) value is NULL. I was able to retrieve the column name from va_cols.

Any help is appreciated. Thanks!--
Regards,
Ashoke

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Best Wishes,
Ashutosh Bapat
EnterpriseDB Corporation
The Postgres Database Company