I am a newbie in Postgresql and using C program to access it.
The following program (below; also in the attachment) reads an existing table "people" having four columns (id, lastname, firstname, phonenumber) and adds a new row (5, XXX, YYY,
7633839276) and a new column (TRUE).
After the proper building and linking and compiling, the program is successfully inserting the row but its unable to insert the column and I get the following output:
Can you please tell me where I am going wrong..
#include <stdio.h>
#include <stdlib.h>
#include <libpq-fe.h>
#include <string.h>
int main()
{
PGconn *conn;
PGresult *res;
int rec_count;
int row;
int col;
conn = PQconnectdb("dbname=test host=localhost user=abc password=xyz");
if(PQstatus(conn) == CONNECTION_BAD) {
puts("We were unable to connect to the database");
exit(0);
}
res = PQexec(conn,"INSERT INTO people VALUES (5, 'XXX', 'YYY', '7633839276');");
if(PQresultStatus(res) != PGRES_COMMAND_OK) {
fprintf(stderr, "Insertion Failed: %s", PQerrorMessage(conn));
PQclear(res);
}
else
printf("Successfully inserted value in Table..... \n");
res = PQexec(conn,"update people set phonenumber=\'5055559999\' where id=3");
res = PQexec(conn,"select lastname,firstname,phonenumber from people order by id");
res = PQexec(conn, "ALTER TABLE people ADD comment VARCHAR(100);");
res = PQexec(conn, "EXEC('UPDATE people SET comment = ''TRUE'';');");
if(PQresultStatus(res) != PGRES_TUPLES_OK) {
puts("We did not get any data!");
exit(0);
}
rec_count = PQntuples(res);
printf("We received %d records.\n", rec_count);
puts("==========================");
for(row=0; row<rec_count; row++) {
for(col=0; col<3; col++) {
printf("%s\t", PQgetvalue(res, row, col));
}
puts("");
}
puts("==========================");
PQclear(res);
PQfinish(conn);
return 0;
}
