Hello,
Suppose I have a table:
create table foo ( id int4, name varchar(50) );
I want to prepare and execute in binary mode:
select name from foo where id in ($1);
Execute works when I have a single value for $1, and treat it as a
normal INT4. However, when I attempt to send multiple values for the
parameter, I get no meaningful results.
My code snippets are below.
When setting up an array of numbers to pass as a parameter, is there
something special that needs to be done? The documentation is quite
vague; I did poke around the source and found in contrib some int_array
code, but don't fully understand it.
I suspect I need to do something like ...
(a) when I prepare, do something to tell postgres that I will have an
array of values, instead of a single value, and/or
(b) perhaps encapsulate the array of integers in some manner.
If I could be pointed to an example or documentation, it would be much
appreciated.
Thanks,
Matt Sanchez
The prepare code snippet:
Oid oids[1] = { 23 }; //INT4OID
result = PQprepare( pgconn, "getname",
"select name from foo where id in ($1)"
1, oids );
The execute code snippet:
int ids[4] = { 3, 5, 6, 8 }; // param values we want to setup
/* convert numbers to network byte order ... */
char * paramvalues[1] = (char *) ids;
int paramlengths[1];
int paramformats[1] = { 1 };
paramlengths[0] = = 4 * sizeof( int );
result = PQexecPrepared( pgconn,
"getname", // statement name
1, // number of params
paramvalues,
paramlenths,
paramformats,
1 );
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