Обсуждение: How to insert values with a new type ?

Hi,

I have the following program :

#include <stdio.h>

typedef struct complexe {   float      x;   float      y;
} complexe;


complexe * complex_in(float x, float y)
{ complexe *result;
 result = (complexe *)palloc(sizeof(complexe));        result->x = x; result->y = y;
 return (result);
}

char * complex_out(complexe *complex)    
{ char *result;
 if (complex == NULL)   return(NULL); result = (char *) palloc(60); sprintf(result, "(%f,%f)", complex->x, complex->y);

 return(result);
}
   
(I took this from someone else...)

Now, I do these SQL commands :

CREATE FUNCTION complex_in(opaque)   RETURNS complex   AS '/ens/klimann/PostgreSQL/complexe.o'   LANGUAGE 'c';

CREATE FUNCTION complex_out(opaque)   RETURNS opaque   AS '/ens/klimann/PostgreSQL/complexe.o'   LANGUAGE 'c';

CREATE TYPE complex (   internallength = 16,       input = complex_in,   output = complex_out
);   
CREATE TABLE nombres (  val COMPLEX
);


And I want to insert values in the table nombres.
I have tried this :
INSERT INTO nombres
VALUES (complex_in(1.0, 4.0));

and this :
INSERT INTO nombres
VALUES (1.0, 4.0);

and also this :
INSERT INTO nombres
VALUES ('1.0, 4.0');

and several other possibilities, but none seems to be right.


Has someone an idea ?

Thanks,
Ines. 

Ines.Klimann@liafa.jussieu.fr writes:
> complexe * complex_in(float x, float y)
> {
>   complexe *result;

>   result = (complexe *)palloc(sizeof(complexe));       
>   result->x = x;
>   result->y = y;

>   return (result);
> }

A datatype's input routine has to accept a string (char *).
        regards, tom lane