I am sorry I used different query in my my last reply and yes you are correct
Tom. Using the $1 worked and the back-end indeed prepared the statement
successfully but this will force me to do some work on the input array that
contains the dynamic elements to comply with string_to_array delimiter when
calling PQexecPrepared(). I would really like to just pass an array of filters
of type (const char* const*) to PQexecPrepared's paramValues[] parameter
instead of making it some sort of csv string.
Here is a sample working code:
char *query="select codec_id,fs_name,pt from codec_defs where fs_name =
ANY(string_to_array($1, ','))";
PGresult *res=PQprepare(conn,"codecs",query,1,NULL);
char *input[1] ={"G729,PCMU"};
PQclear(res);
res=PQexecPrepared(conn,"codecs",1,(const char* const*)input,NULL ,NULL,0);
//The second version( ANY($1::text[] )
char *query="select codec_id,fs_name,pt from codec_defs where fs_name =
ANY($1::text[])";
//this gets prepared successfully
PGresult *res=PQprepare(conn,"codecs",query,1,NULL);
char *input[2] ={"G729","PCMU"};
PQclear(res);
//the below generate an erro:
res=PQexecPrepared(conn,"codecs",2,(const char* const*)input,NULL ,NULL,0);
//PQexecPrepared() generates Error:
ERROR: bind message supplies 2 parameters, but prepared statement "codecs"
requires 1
On Tuesday, November 24, 2020, 01:18:15 PM PST, Tom Lane
<t...@sss.pgh.pa.us> wrote:
Dave Greeko <davegre...@yahoo.com> writes:
> I tried both and I am getting syntax error.
> char *query="select codec_id,fs_name,pt from codec_defs where pt =
> ANY(string_to_array(?, ','))";
> OR
> char *query="select codec_id,fs_name,pt from codec_defs where pt =
> ANY(?::text)";
> PGresult *res=PQprepare(conn,"codecs",query,1,NULL);
Well, your first problem is that "?" is not the parameter symbol
understood by libpq+backend. Try "$1". The other problem,
at least for the second version of that, is that you want to be
passing a text array not a single text value --- so it needs to
look more like "where pt = ANY($1::text[])".
regards, tom lane
