1/*
2REM
3REM q03.pc
4REM
5REM Find the model number and price of all products
6REM (of any type) made by manufacturer 'B'.
7REM
8*/
9
10#include <stdio.h>
11#include <sqlca.h>
12
13#define UNAME_LEN 32
14#define PWD_LEN 16
15
16VARCHAR username[UNAME_LEN]; /* VARCHAR is an Oracle-supplied struct */
17VARCHAR password[PWD_LEN]; /* varchar can be in lower case also. */
18
19char u_name[UNAME_LEN];
20char pwd[PWD_LEN];
21
22struct {
23 char model[6];
24 int price;
25} modelprice;
26
27void connect_to_oracle();
28void sql_error();
29
30void main(int argc, char* argv[]) {
31 connect_to_oracle();
32
33 EXEC SQL DECLARE c CURSOR FOR
34 (SELECT PC.model, price
35 FROM Product P, PC
36 WHERE maker='B'
37 AND P.model=PC.model )
38 UNION
39 (SELECT L.model, L.price
40 FROM Product P, Laptop L
41 WHERE maker='B'
42 AND P.model=L.model)
43 UNION
44 (SELECT R.model, R.price
45 FROM Product P, Printer R
46 WHERE P.maker='B'
47 AND P.model=R.model);
48
49 EXEC SQL OPEN c;
50
51 EXEC SQL WHENEVER NOT FOUND DO BREAK;
52
53 printf("\nmodel\tprice\n");
54 for(;;) {
55 EXEC SQL FETCH c INTO :modelprice;
56 printf("%s\t%d\n", modelprice.model,
57 modelprice.price);
58 }
59
60 EXEC SQL CLOSE c;
61
62 EXEC SQL COMMIT WORK RELEASE;
63
64 exit(0);
65}
66
67
68void sql_error(char* msg) {
69 char err_msg[128];
70 int buflen, msglen;
71
72 EXEC SQL WHENEVER SQLERROR CONTINUE;
73
74 printf("%s \n", msg);
75 buflen = sizeof(err_msg);
76 sqlglm(err_msg, &buflen, &msglen);
77 printf("%.*s \n", msglen, err_msg);
78 exit(1);
79}
80
81
82void connect_to_oracle() {
83 /* get your username/passwd from "user_pwd.txt" file */
84
85 FILE *in_file;
86 in_file = fopen("user_pwd.txt", "r");
87 fscanf(in_file, "%s", u_name);
88 fscanf(in_file, "%s", pwd);
89
90 strncpy((char *) username.arr, u_name, UNAME_LEN);
91 username.len = strlen((char *) username.arr);
92
93 strncpy((char *) password.arr, pwd, PWD_LEN);
94 password.len = strlen((char *) password.arr);
95
96 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
97 EXEC SQL CONNECT :username IDENTIFIED BY :password;
98
99 printf("connected to oracle - \n");
100}